diff --git a/.github/workflows/wai-catalogue.yml b/.github/workflows/wai-catalogue.yml
index ab6073666..c79832c9b 100644
--- a/.github/workflows/wai-catalogue.yml
+++ b/.github/workflows/wai-catalogue.yml
@@ -123,8 +123,10 @@ jobs:
       # --confirm, its deprecated spelling),
       # first in the archive's build (quickstart), then with every command-line feature that
       # needs no system library, so --dry-run is held on generate, score and stage too, with
-      # Create's (app), so it is held on wai app export, and with the revenue share's
-      # (revenue_share), so it is held on wai contract create|accept and wai statement create.
+      # Create's (app), so it is held on wai app export, with the revenue share's
+      # (revenue_share), so it is held on wai contract create|accept and wai statement create, and
+      # with the opportunity report's (opportunity_report), so it is held on wai opportunity
+      # create and wai statement check.
       - name: The catalogue's rules, and the command line through it
         shell: bash
         working-directory: wai/wai-rs
@@ -141,3 +143,5 @@ jobs:
           ran "$RUNNER_TEMP/cli-app.log"
           cargo test --locked --no-default-features --features quickstart,revenue_share --test cli_ops 2>&1 | tee "$RUNNER_TEMP/cli-share.log"
           ran "$RUNNER_TEMP/cli-share.log"
+          cargo test --locked --no-default-features --features quickstart,opportunity_report --test cli_ops 2>&1 | tee "$RUNNER_TEMP/cli-opportunity.log"
+          ran "$RUNNER_TEMP/cli-opportunity.log"
diff --git a/.github/workflows/wai-conformance.yml b/.github/workflows/wai-conformance.yml
index 7e7ea2570..61b0b8f7c 100644
--- a/.github/workflows/wai-conformance.yml
+++ b/.github/workflows/wai-conformance.yml
@@ -200,6 +200,10 @@ on:
       # test reads its sections. Its corpus is generated from the ledger corpus, under the paths
       # above.
       - 'wai/extensions/revenue-share.md'
+      # tests/opportunity_report.rs requires this extension's §13 to list the codes the reference
+      # reports, opportunity_report_verify.py reads that table, and the registry's wire identifiers
+      # test reads its sections. Its corpus is generated from fixed seeds, under the paths above.
+      - 'wai/extensions/opportunity-report.md'
       # tests/stream_audit.rs requires this extension's §14 to list the codes the reference
       # reports, stream_audit_verify.py reads that table, and the registry's wire identifiers test
       # reads its sections.
@@ -1160,7 +1164,7 @@ jobs:
     name: independent verifiers · claims, JWP, key discovery and integer payloads (Python)
     runs-on: linux-arm64
     env:
-      WAI_FEATURES: key_discovery,http,video_manifest,stage_measure,live_events,live_room,capture_take,live_compose,live_record,timed_text,access_services,live_metering,energy_steering,live_moderation,dred_exact,live_ads,live_provenance,synthesis,synthesis_mark,neural_int,exact_upscale,robustness,ai_usage,contribution,settlement,browser_sink,receipt_claims,takedown,influence,direction,co_performance,age_assurance,bearer_receipts,exploration,co_watch,telemetry_aggregate,exact_tonemap,splat_exact,live_watermark,derive_edge,sink_energy,key_release,stitched_presentation,prior_wire,scene_map,avatar_face,receipt_ledger,stream_audit,fleet,native_sink,platform_encode,remote_desktop,stream_termination,live_world,format_probe,live_messaging,conform_result,revenue_share
+      WAI_FEATURES: key_discovery,http,video_manifest,stage_measure,live_events,live_room,capture_take,live_compose,live_record,timed_text,access_services,live_metering,energy_steering,live_moderation,dred_exact,live_ads,live_provenance,synthesis,synthesis_mark,neural_int,exact_upscale,robustness,ai_usage,contribution,settlement,browser_sink,receipt_claims,takedown,influence,direction,co_performance,age_assurance,bearer_receipts,exploration,co_watch,telemetry_aggregate,exact_tonemap,splat_exact,live_watermark,derive_edge,sink_energy,key_release,stitched_presentation,prior_wire,scene_map,avatar_face,receipt_ledger,stream_audit,fleet,native_sink,platform_encode,remote_desktop,stream_termination,live_world,format_probe,live_messaging,conform_result,revenue_share,opportunity_report
       WAI_PQ_FEATURES: synthesis,pq_signatures
       WAI_RELEASE_FEATURES: dred_exact,synthesis_mark,robustness,avatar_face
     steps:
@@ -1255,7 +1259,7 @@ jobs:
             --test stitched_presentation --test prior_wire --test scene_map --test receipt_ledger \
             --test stream_audit --test fleet --test native_sink --test platform_encode --test remote_desktop \
             --test stream_termination --test live_world --test format_probe --test live_messaging \
-            --test conform_result --test revenue_share
+            --test conform_result --test revenue_share --test opportunity_report
           cargo test --release --no-run --no-default-features --features "$WAI_RELEASE_FEATURES" \
             --test dred_exact --test dred_exact_measure --test synthesis_mark --test robustness \
             --test avatar_face
@@ -2014,6 +2018,29 @@ jobs:
           (cd wai-rs && cargo test --no-default-features --features "$WAI_FEATURES" --lib wai_video_channel::)
           (cd wai-rs && cargo test --no-default-features --features "$WAI_FEATURES" --test revenue_share)
           python3 -I live-conformance/revenue_share_verify.py live-conformance/share
+      # wai.delivery.opportunity (extensions/opportunity-report.md): the reference module's unit
+      # tests (the SCTE 35 subset reader against the standard's sample and damaged sections, the
+      # reported statement's JSON and CSV forms and dates, the report's and the check's reading and
+      # rules, the ratios); tests/opportunity_report.rs (vectors.json regenerates byte for byte
+      # from its fixed seeds and no other file is there; wai-rs gives every vector its stated
+      # outcome; every reason of §13 and every reused code refuses a vector; §13 lists exactly the
+      # reference's codes; the worked example, a channel's day whose reported statement
+      # under-reports one owner's programme, and the check that shows it, recomputed from the
+      # public records alone); then the corpus's second implementation, opportunity_report_verify.py,
+      # written from the extension's text and sharing no code with wai-rs, which verifies rooms
+      # with live_ads_verify.py and contracts, runs and signed statements with
+      # revenue_share_verify.py, reads every report, check, section and reported statement itself,
+      # recomputes every break, attribution, line, citation and flag, requires every mutated copy
+      # of the corpus to fail, and drops each of its own checks in turn and requires the corpus to
+      # catch the weakened verifier; standard library only, run isolated (-I).
+      - name: opportunity report · wai-rs and opportunity_report_verify.py
+        working-directory: wai
+        shell: bash
+        run: |
+          set -euo pipefail
+          (cd wai-rs && cargo test --no-default-features --features "$WAI_FEATURES" --lib opportunity_report::)
+          (cd wai-rs && cargo test --no-default-features --features "$WAI_FEATURES" --test opportunity_report)
+          python3 -I live-conformance/opportunity_report_verify.py live-conformance/opportunity
       # wai.delivery.audit (extensions/stream-audit.md): the reference module's unit tests (the
       # acknowledgement windows, chains and repeats of §4.2, the origin rule, the report's bytes,
       # channel names) and tests/stream_audit.rs (vectors.json regenerates byte for byte from its
@@ -2692,7 +2719,7 @@ jobs:
               synthesis,pq_signatures sink_energy key_release stitched_presentation prior_wire \
               prior_wire,neural_int scene_map avatar_face receipt_ledger stream_audit fleet native_sink \
               platform_encode remote_desktop stream_termination live_world format_probe live_messaging \
-              conform_result revenue_share; do
+              conform_result revenue_share opportunity_report; do
             echo "::group::$f"
             cargo check --no-default-features --features "$f" --tests
             echo "::endgroup::"
diff --git a/wai/CHANGELOG.md b/wai/CHANGELOG.md
index aa453afde..09483e960 100644
--- a/wai/CHANGELOG.md
+++ b/wai/CHANGELOG.md
@@ -6,6 +6,35 @@ wire format may change and such changes are recorded here.
 
 ## Unreleased
 
+### The opportunity report and the statement check: what a channel's records prove, beside what a platform reported
+
+- **`wai.delivery.opportunity`** ([`extensions/opportunity-report.md`](extensions/opportunity-report.md)), a new
+  record. An **opportunity report**, `WOR1`, states for one party of a revenue-share contract and one period the ad
+  breaks that aired in the programmes of the splits it shares in: the breaks a room the contract names makes of its
+  signed cues (`wai.live.ads` §4.3), each cue's SCTE 35 section read for its id, duration and slots (a placement
+  opportunity's `sub_segments_expected`, or the room policy's slots) and held to the cue's summary, and the ad entries
+  of the channel's signed program-as-run that no cue covers; each placed at its start on the window that aired it and
+  attributed to the programme on air by the contract's map and rule. Each line, per split and class (cued,
+  scheduled), states the breaks, their seconds, their slots and those with none, with a citation digest of the cues,
+  policies and runs it came from. The report is signed by its issuer, and every figure recomputes from the records.
+- **A reported statement**: a platform's figures for the period, per day or per programme, in a documented JSON or
+  CSV (RFC 4180) form; read, labelled reported, and never evidence.
+- **A statement check**, `WCK1`: per period, day and programme, the opportunities, the reported impressions and
+  revenue, the implied fill (impressions per slot, in millionths) and revenue per slot; flags for a figure no break
+  stands behind and for a line far from the period's own rate at bounds the check states; and, where the operator's
+  signed revenue-share statement of the same party and period is given, its impressions and revenue (gross, or the
+  party's part) beside the reported ones.
+- **Operations** `opportunity.create` (`wai opportunity create`), `opportunity.verify` (`wai opportunity verify`, a
+  report's or a check's document) and `statement.check` (`wai statement check`), in a build with the feature
+  `opportunity_report`, under the agent rules.
+- **Conformance**: `live-conformance/opportunity/`, written by `wai_opportunity_vectors` from fixed seeds: a channel's
+  day of two owners, a room cueing breaks with every kind of section the text reads, the operator's signed
+  statements of the day, the reports of both owners and the operator, checks in JSON and CSV (one under-reporting an
+  owner's programme), and a refused vector for each reason. Its second implementation,
+  `live-conformance/opportunity_report_verify.py`, verifies rooms with `live_ads_verify.py` and contracts, runs and
+  statements with `revenue_share_verify.py`, and recomputes every break, line and flag itself.
+- `revenue_share`'s run reader and asset rule are shared with the new module (`pub(crate)`); no record's bytes change.
+
 ### The revenue share: what each owner of a channel is owed, recomputable from the public records
 
 - **`wai.delivery.revenue_share`** ([`extensions/revenue-share.md`](extensions/revenue-share.md)), a new record. An
diff --git a/wai/REGISTRY.md b/wai/REGISTRY.md
index 4f4a7506c..1b3774104 100644
--- a/wai/REGISTRY.md
+++ b/wai/REGISTRY.md
@@ -187,6 +187,7 @@ and a role are fixed once registered.
 | `wai.delivery.audit` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.delivery.fleet` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.delivery.ledger` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
+| `wai.delivery.opportunity` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.delivery.revenue_share` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.delivery.settlement` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.derive.crop` | derivation | registered | — | — | patent-pool | — | — | §5 Prior artifacts, general tensors and derivation operations |
@@ -381,6 +382,7 @@ and a role are fixed once registered.
 | `WCA1` | magic | defined | live-messaging §10.3 |
 | `WCD1` | magic | defined | live-compose §3.1 |
 | `WCI1` | magic | defined | live-messaging §10.2 |
+| `WCK1` | magic | defined | opportunity-report §10.1 |
 | `WCL1` | magic | defined | live-recording §5.1 |
 | `WCN1` | magic | defined | capture-binding §8.1 |
 | `WCR1` | magic | defined | live-compose §8.1 |
@@ -413,6 +415,7 @@ and a role are fixed once registered.
 | `WMP1` | magic | defined | live-moderation §3.1 |
 | `WMR1` | magic | defined | live-metering §4.1 |
 | `WMS1` | magic | defined | live-moderation §4.2 |
+| `WOR1` | magic | defined | opportunity-report §7.1 |
 | `WPA1` | magic | defined | co-performance §7.3 |
 | `WPC1` | magic | defined | ad-presentation §5.1 |
 | `WPF1` | magic | defined | co-performance §5.6 |
diff --git a/wai/SPEC.md b/wai/SPEC.md
index b5d5b2a24..c8eb47ca1 100644
--- a/wai/SPEC.md
+++ b/wai/SPEC.md
@@ -1544,6 +1544,24 @@ not map, a contract an owner did not countersign, two contracts that overlap, an
 invoices bill, a split whose shares do not sum, and a line no record covers. No payment and no
 currency conversion: [`extensions/revenue-share.md`](extensions/revenue-share.md).
 
+And for **checking a platform's reported figures against the opportunities a channel's own records
+prove** — `wai.delivery.opportunity`: an opportunity report, `WOR1`, states for one party of a
+revenue-share contract and one period the ad breaks that aired in the programmes of the splits it
+shares in, each from the signed cues of a room the contract names (the schedule `wai.live.ads` makes
+of them, its slots those an SCTE 35 placement opportunity in the cue's section states, or the room
+policy's) or from an ad entry of the channel's signed program-as-run that no cue covers, placed at its
+start on the window that aired it and attributed to the programme on air; per split and class it
+states the breaks, their seconds and their slots, with a citation digest of the cues, policy and runs
+they came from. A reported statement, the platform's own figures in a documented JSON or CSV form, is
+read and never treated as evidence. A statement check, `WCK1`, sets them side by side for the period,
+each day and each programme: the opportunities, the reported impressions and revenue, impressions and
+revenue per slot, flags for a figure no break stands behind and for one far from the period's own
+rate, and, where the operator's signed revenue-share statement of the same party and period is given,
+its impressions and revenue beside the reported ones. A verifier refuses a cue whose section its
+summary contradicts, a break no window places, two rooms' breaks at once, and a report or a check that
+does not recompute. No parser of any platform's own format:
+[`extensions/opportunity-report.md`](extensions/opportunity-report.md).
+
 And for **auditing a stream another service delivers** — `wai.delivery.audit`: a content owner's
 players, with nothing asked of the service that packages and delivers the stream over HTTP. For each
 playback session a player makes a fresh key and signs with it settlement acknowledgements of every
diff --git a/wai/catalogue/ops.json b/wai/catalogue/ops.json
index 702e27425..2c17f0756 100644
--- a/wai/catalogue/ops.json
+++ b/wai/catalogue/ops.json
@@ -6428,6 +6428,289 @@
         "sdk": "wai.statement.verify"
       }
     },
+    {
+      "id": "opportunity.create",
+      "summary": "A party's opportunity report for a period: the ad breaks a channel's signed cues and program-as-run prove in the programmes it shares in, signed with the issuer key",
+      "cli": "wai opportunity create",
+      "aliases": [],
+      "usage": [
+        "wai opportunity create <inputs.json> --party <key> --start µs --end µs --key <file> [--out F] [--yes]   the report",
+        "    (WOR1) of the party for [start, end), computed from a verification document without its report (the",
+        "    contract, other contracts, runs and rooms), signed with the issuer key and written with its document to F",
+        "    (<digest>.wai-opportunity.json) for `wai opportunity verify`; replacing a file waits for --yes"
+      ],
+      "placement": "local",
+      "effect": "writes-project",
+      "dry_run": true,
+      "confirm": "when-replacing-a-file",
+      "route": null,
+      "doors": {
+        "cli": true,
+        "mcp": false,
+        "http": false
+      },
+      "toolset": "core",
+      "stability": "preview",
+      "input": {
+        "type": "object",
+        "properties": {
+          "inputs": {
+            "type": "string",
+            "format": "path",
+            "description": "A verification document without its report: contract, contracts, runs and rooms.",
+            "x-cli": {
+              "positional": true
+            }
+          },
+          "party": {
+            "type": "string",
+            "description": "The party's key, 64 hexadecimal digits: the operator or an owner.",
+            "x-cli": {
+              "flag": "--party"
+            }
+          },
+          "start": {
+            "type": "integer",
+            "description": "The period's start, microseconds since 1970.",
+            "x-cli": {
+              "flag": "--start"
+            }
+          },
+          "end": {
+            "type": "integer",
+            "description": "The period's end, after its start.",
+            "x-cli": {
+              "flag": "--end"
+            }
+          },
+          "key": {
+            "type": "string",
+            "format": "path",
+            "description": "The issuer key's file: 32 bytes, or 64 hexadecimal digits.",
+            "x-cli": {
+              "flag": "--key"
+            }
+          },
+          "out": {
+            "type": "string",
+            "format": "path",
+            "description": "The verification document's file (<digest>.wai-opportunity.json).",
+            "x-cli": {
+              "flag": "--out"
+            }
+          }
+        },
+        "required": [
+          "inputs",
+          "party",
+          "start",
+          "end",
+          "key"
+        ],
+        "additionalProperties": false
+      },
+      "output": {
+        "type": "object",
+        "required": [
+          "file",
+          "report",
+          "outcome"
+        ],
+        "description": "The opportunity report (WOR1, hexadecimal), the file its verification document went to, and its outcome, recomputed here"
+      },
+      "stream": null,
+      "since": "0.3.0",
+      "deprecated": null,
+      "receipt": true,
+      "needs": {
+        "all": [
+          "opportunity_report"
+        ]
+      },
+      "names": {
+        "cli": "wai opportunity create",
+        "mcp": null,
+        "c": "wai_opportunity_create",
+        "rust": "wai::opportunity::create",
+        "sdk": "wai.opportunity.create"
+      }
+    },
+    {
+      "id": "opportunity.verify",
+      "summary": "An opportunity report's or a statement check's verification document checked: every break, line and flag recomputed from the records, or the reason it is refused",
+      "cli": "wai opportunity verify",
+      "aliases": [],
+      "usage": [
+        "wai opportunity verify <document.json>   the outcome of a report's or a check's verification document: each break",
+        "    attributed, each line and flag recomputed; exit 1 with the reason on a refusal"
+      ],
+      "placement": "local",
+      "effect": "reads",
+      "dry_run": false,
+      "confirm": "never",
+      "route": null,
+      "doors": {
+        "cli": true,
+        "mcp": false,
+        "http": false
+      },
+      "toolset": "core",
+      "stability": "preview",
+      "input": {
+        "type": "object",
+        "properties": {
+          "document": {
+            "type": "string",
+            "format": "path",
+            "description": "The verification document: a report's (contract, contracts, report, runs, rooms) or a check's (report, reported, statement, check).",
+            "x-cli": {
+              "positional": true
+            }
+          }
+        },
+        "required": [
+          "document"
+        ],
+        "additionalProperties": false
+      },
+      "output": {
+        "type": "object",
+        "required": [
+          "outcome"
+        ],
+        "description": "An accepted report's outcome (opportunity-report §8.3: every break attributed, each line and the totals) or an accepted check's (§11.3: each line's opportunities, reported and signed figures and flags)"
+      },
+      "stream": null,
+      "since": "0.3.0",
+      "deprecated": null,
+      "receipt": false,
+      "needs": {
+        "all": [
+          "opportunity_report"
+        ]
+      },
+      "names": {
+        "cli": "wai opportunity verify",
+        "mcp": null,
+        "c": "wai_opportunity_verify",
+        "rust": "wai::opportunity::verify",
+        "sdk": "wai.opportunity.verify"
+      }
+    },
+    {
+      "id": "statement.check",
+      "summary": "A platform's reported statement checked against an opportunity report and, when given, the operator's signed statement, signed with the issuer key",
+      "cli": "wai statement check",
+      "aliases": [],
+      "usage": [
+        "wai statement check <report.json> <reported> [--statement <document.json>] [--floor ppm] [--ceiling ppm] --key <file> [--out F] [--yes]",
+        "    the check (WCK1) of a reported statement (JSON, or CSV for a file named .csv) beside a report's verification",
+        "    document and a signed statement's, at the bounds given (500000 and 2000000 when not), signed with the issuer",
+        "    key and written with its document to F (<digest>.wai-check.json); replacing a file waits for --yes"
+      ],
+      "placement": "local",
+      "effect": "writes-project",
+      "dry_run": true,
+      "confirm": "when-replacing-a-file",
+      "route": null,
+      "doors": {
+        "cli": true,
+        "mcp": false,
+        "http": false
+      },
+      "toolset": "core",
+      "stability": "preview",
+      "input": {
+        "type": "object",
+        "properties": {
+          "report": {
+            "type": "string",
+            "format": "path",
+            "description": "A report's verification document, with its report.",
+            "x-cli": {
+              "positional": true
+            }
+          },
+          "reported": {
+            "type": "string",
+            "format": "path",
+            "description": "The reported statement: JSON, or CSV for a file named .csv.",
+            "x-cli": {
+              "positional": true
+            }
+          },
+          "statement": {
+            "type": "string",
+            "format": "path",
+            "description": "A signed revenue-share statement's verification document of the same party and period.",
+            "x-cli": {
+              "flag": "--statement"
+            }
+          },
+          "floor": {
+            "type": "integer",
+            "description": "The lower bound, in millionths of the period's rate (500000).",
+            "x-cli": {
+              "flag": "--floor"
+            }
+          },
+          "ceiling": {
+            "type": "integer",
+            "description": "The upper bound, in millionths of the period's rate (2000000).",
+            "x-cli": {
+              "flag": "--ceiling"
+            }
+          },
+          "key": {
+            "type": "string",
+            "format": "path",
+            "description": "The issuer key's file: 32 bytes, or 64 hexadecimal digits.",
+            "x-cli": {
+              "flag": "--key"
+            }
+          },
+          "out": {
+            "type": "string",
+            "format": "path",
+            "description": "The verification document's file (<digest>.wai-check.json).",
+            "x-cli": {
+              "flag": "--out"
+            }
+          }
+        },
+        "required": [
+          "report",
+          "reported",
+          "key"
+        ],
+        "additionalProperties": false
+      },
+      "output": {
+        "type": "object",
+        "required": [
+          "file",
+          "check",
+          "outcome"
+        ],
+        "description": "The statement check (WCK1, hexadecimal), the file its verification document went to, and its outcome, recomputed here"
+      },
+      "stream": null,
+      "since": "0.3.0",
+      "deprecated": null,
+      "receipt": true,
+      "needs": {
+        "all": [
+          "opportunity_report"
+        ]
+      },
+      "names": {
+        "cli": "wai statement check",
+        "mcp": null,
+        "c": "wai_statement_check",
+        "rust": "wai::statement::check",
+        "sdk": "wai.statement.check"
+      }
+    },
     {
       "id": "ops.list",
       "summary": "Every operation of this catalogue: its id, command line, effect and whether this build holds it",
diff --git a/wai/extensions/opportunity-report.md b/wai/extensions/opportunity-report.md
new file mode 100644
index 000000000..6aa6b1254
--- /dev/null
+++ b/wai/extensions/opportunity-report.md
@@ -0,0 +1,643 @@
+# WAI Extension: Opportunity Report
+
+> Status: Draft. Registers the record `wai.delivery.opportunity`: the ad opportunities a linear
+> channel's own signed records prove, per content owner and per period, and the check of a
+> platform's reported figures against them. An **opportunity report**, `WOR1`, states for one
+> party of a [revenue-share](revenue-share.md) contract and one period the ad breaks that aired in
+> the programmes of the splits it shares in: each break from the cues of a room the contract
+> names ([live-ads](live-ads.md) §4.3, the SCTE 35 sections they carry read for their slots) or
+> from an ad entry of the channel's signed program-as-run (`wai.video.channel`), placed at its
+> start on a window that aired it and attributed to the programme on air; and, per split and class,
+> the breaks, their seconds and their slots, with the records each line came from. A **reported
+> statement** is what a platform says it counted: a documented JSON or CSV form of impressions and
+> revenue for the period, per day or per programme, which this text reads and never treats as
+> evidence. A **statement check**, `WCK1`, sets the report beside the reported figures: per line,
+> the opportunities, the reported impressions, the implied fill and the revenue per slot, the lines
+> where a reported figure has no break behind it or lies far from the period's own rate, and, where
+> the operator's signed revenue-share statement of the same party and period is given, the signed
+> impressions and revenue beside the reported ones. Integer arithmetic throughout. No new
+> transport, no payment, and no reading of any platform's own report format. The reference
+> implementation is the `opportunity_report` module of `wai-rs` (feature `opportunity_report`);
+> the corpus is [`live-conformance/opportunity/`](../live-conformance/opportunity/), and its second
+> implementation is `live-conformance/opportunity_report_verify.py`.
+> Keywords **MUST**, **MUST NOT**, **SHOULD**, **MAY** are RFC 2119/8174.
+>
+> Texts read for this revision: the WAI texts this one cites; ANSI/SCTE 35-1 2023r2 through the
+> fields cue-injection §5 writes (its §9.6 to §9.9 and §10.2 and §10.3, as that text read them);
+> ISO/IEC 13818-1 Annex A (the CRC); RFC 4180 (the CSV form of §9.2); RFC 8259; RFC 8032;
+> FIPS 180-4.
+>
+> Why a text of its own, beside revenue-share: a report rests on records the statement does not
+> read (a room's cues and the SCTE 35 sections they carry), needs no invoice, and is useful to an
+> owner whose platform signs no statement; and revenue-share's records keep their bytes. Why the
+> name: the record states the opportunities a channel's records prove, and names both of its
+> parts, the report and the check, under one string.
+
+## 1. Scope
+
+In scope: the evidence a report rests on, the contract, the runs and the rooms (§3); breaks, from
+a room's cues and from the program-as-run, their start, duration and slots (§4); the subset of an
+SCTE 35 section this text reads, and its agreement with the cue that carries it (§5); attribution,
+from a break's start to a split (§6); the report, its lines and citations (§7) and its
+verification (§8); the reported statement, in JSON and in CSV (§9); the check, its lines, figures
+and flags, and the signed statement beside it (§10), and its verification (§11); and the
+operations (§12).
+
+Out of scope: a transport; a parser of any platform's own report format, which turns that format
+into §9's; paying an owner, which revenue-share leaves out too; an audience count, which no record
+of this text states (§10.3); and the records this text reads, which their own extensions define,
+verify and leave as they are. No existing record's signed bytes change.
+
+Relationship to the core spec: `wai.delivery.opportunity` is a **record** ([SPEC](../SPEC.md) §5):
+a signed record a WAI tool emits and verifies. It names no payload format and is not
+dispatchable.
+
+## 2. Terms
+
+- **Contract**, **operator**, **owner**, **party**, **split**, **run**, **window**, **entry**,
+  **programme**, **carrier**, **ppm**, **time**, **period**: as revenue-share §2 and §3 define
+  them. Time is microseconds since 1970-01-01T00:00:00Z; a period is `[start, end)`.
+- **Room**, **cue**, **break**, **open**, **closed**, **avail**: as live-ads §2 and §4.3.
+- **Issuer**: the Ed25519 key (RFC 8032) that signs a report or a check: the owner itself, the
+  operator, or an auditor either chooses. A report's figures are recomputed from the records, so
+  an issuer's signature binds the issuer to what it states, and adds nothing a verifier trusts.
+- **Section**: an SCTE 35-1 `splice_info_section()` a cue of form 1 carries (live-events §4.3).
+- **Slots**: the ads one break holds (§4.4).
+- **Day**: a UTC calendar date, written `YYYY-MM-DD`; its span is from its 00:00:00Z (included)
+  to the next date's (excluded).
+- *u64*, *u32*, *u16*, *u8*: little-endian unsigned integers in this text's records; the bit fields
+  of a section are big-endian, as SCTE 35 writes them. A **digest** is SHA-256 (FIPS 180-4); zero
+  is 32 zero bytes. A *text* field is a u16 length and that many bytes of UTF-8.
+
+## 3. The evidence
+
+### 3.1 The contract
+
+The contract is a revenue-share contract (revenue-share §3), in force, and verified as
+revenue-share §8.2 steps 1 and 2 verify one, with the other contracts given for the overlap check.
+It names the channel, the key that signs its runs, its carriers, its owners, its splits and the
+map from each asset to a split, and the rule for an entry that is not a programme.
+
+### 3.2 The runs
+
+Each run is a `wai.video.channel` receipt in its JSON carriage (revenue-share §4.1), verified as
+revenue-share §8.2 step 4 verifies one: it reads, it verifies, it is of the contract's channel and
+signer, and its window shares no instant with the window of a run before it.
+
+### 3.3 The rooms
+
+Each room is given as a live-ads verifier is given one (live-ads §9.1), without receipts: its
+`descriptor`, `grants`, `key_log` (the key-log head, or `null`), `chains` and `policy`. It is
+verified as live-ads §9.2 steps 1 to 3 verify one: the room (live-rooms §9), the policy, and the
+schedule its accepted cues make. A room with a gap has no schedule: a schedule read from part of
+the cues is not the room's, and the room is refused `delivery_gap`. The room's id is a carrier of
+kind 1 of the contract, or the room is refused `room_foreign`; a room whose id is that of a room
+given before it is refused `room_repeated`.
+
+So the cues are the room's own: each signed by a principal the room's grants permit `cue`, in its
+chain, and held to live-ads' schedule rules. A cue an injector signed ([cue-injection](cue-injection.md))
+is such a cue; its injection record rides in the same chain, and this text does not translate it
+again (cue-injection §8 does).
+
+## 4. Breaks
+
+### 4.1 Cued breaks
+
+Each break of a room's schedule (live-ads §4.3) is a **cued break**:
+
+- its **start** is the room descriptor's `t0` plus the `t` of the cue that opens it, in
+  microseconds since 1970; a start that does not fit in a u64 lies outside every period;
+- its **duration**, in milliseconds, is a closed break's duration (live-ads §4.3: an out's, from
+  its in, or a break's of type 4), and an open break's avail;
+- its **opening cue** is the cue whose digest names it (live-ads §4.4), and its **closing cue**
+  the in that closed it, when one did;
+- its **section** is the opening cue's, when the cue is of form 1 (§5).
+
+### 4.2 Scheduled breaks
+
+The runs are taken in ascending order of `window_start_ms`, and in each the entries of its `aired`
+list in ascending order. An entry of kind `ad` is a **scheduled break**, once: an entry whose leaf
+(revenue-share §4.2) is the leaf of an entry taken in an earlier run is the same break and is
+passed over. Its start is the entry's `start_ms` × 1000, its duration the entry's `duration_ms`,
+and its run and entry those it was taken in. An entry that airs in two windows is one break.
+
+A scheduled break is **cued** when the start of a cued break of any room given lies within its
+span, from its start (included) to its start plus its duration × 1000 (excluded). A cued scheduled
+break is counted by its cued break, and is not a break of its own.
+
+### 4.3 Classes, and the period
+
+A break is in a report when its start lies within the report's period; a break outside it is
+another period's, and is passed over. Every break of a report is of one **class**:
+
+| class | name | the break |
+|---|---|---|
+| 1 | **cued** | a cued break (§4.1) |
+| 2 | **scheduled** | a scheduled break no cued break counts (§4.2) |
+
+A class is never summed into another: each has its own lines (§7.2).
+
+### 4.4 Slots
+
+A break's **slots**, and where they come from:
+
+1. a cued break whose section states slots (§5.2): those;
+2. another cued break: its room policy's `slots` (live-ads §3.1), the most ads one break holds;
+3. a scheduled break: none. Its record states no slots, and it is **unslotted**.
+
+A section that states slots is the content's own signal of the break's placements, and is taken
+over the policy, which states the most a decision fills.
+
+## 5. The section a cue carries
+
+### 5.1 Reading
+
+A section is read as SCTE 35-1 Table 5 lays it out, every field in its order and its width, and
+refused `cue_section_invalid` at the first of these that holds:
+
+1. it is shorter than 20 bytes, or its `CRC_32`, the last four bytes, is not the MPEG-2 CRC
+   (ISO/IEC 13818-1 Annex A: polynomial 0x04C11DB7, register preset to all ones, no reflection,
+   no final inversion) over every byte before them;
+2. its `protocol_version` is not 0;
+3. its `encrypted_packet` is 1: the section is read no further, and states nothing (§5.2);
+4. its command, the `splice_command_length` bytes from byte 14 (after `splice_command_type`, byte
+   13), runs past the CRC; a `splice_command_length` of 0xFFF states no length, and the command's
+   length is then what step 5 reads of it, or, for a command step 5 does not read, the section
+   states nothing past its CRC check;
+5. the command does not read as its table lays it out, filling exactly its length:
+   `splice_insert()` (type 0x05): `splice_event_id`, `splice_event_cancel_indicator` and, when it
+   is 0, the flags `out_of_network_indicator`, `program_splice_flag`, `duration_flag` and
+   `splice_immediate_flag`, then `splice_time()` when the program flag is 1 and the immediate flag
+   0, or `component_count` and each component with its `splice_time()` when the immediate flag is
+   0, when the program flag is 0; then `break_duration()` (`auto_return`, `duration`) when the
+   duration flag is 1; then `unique_program_id`, `avail_num` and `avails_expected`;
+   `time_signal()` (type 0x06): one `splice_time()`; `splice_null()` (type 0x00): nothing; a
+   `splice_time()` is one byte when its `time_specified_flag` is 0, and five, with `pts_time`,
+   when it is 1. Another command is not read;
+6. `descriptor_loop_length` runs past the CRC, or the loop's last descriptor does not end where
+   the CRC begins; a descriptor (a tag, a length, that many bytes) runs past the loop;
+7. a descriptor of tag 0x02 whose first four bytes are `CUEI` does not read as a
+   `segmentation_descriptor()` (SCTE 35-1 Table 20) fills its length: `segmentation_event_id`,
+   `segmentation_event_cancel_indicator`, and, when that is 0, `program_segmentation_flag`,
+   `segmentation_duration_flag`, `delivery_not_restricted_flag` and the restriction bits, the
+   components when the program flag is 0 (six bytes each), `segmentation_duration` (40 bits) when
+   flagged, `segmentation_upid_type`, `segmentation_upid_length` and the UPID,
+   `segmentation_type_id`, `segment_num` and `segments_expected`, then, for the types 0x30, 0x32,
+   0x34, 0x36, 0x38, 0x3A, 0x44 and 0x46, the two bytes `sub_segment_num` and
+   `sub_segments_expected` when two bytes remain. Any other count of bytes remaining refuses it.
+
+A section is read only as far as this. Another descriptor is passed over whole.
+
+### 5.2 What a section states
+
+- **Its id**: a `splice_insert()`'s `splice_event_id`; a `time_signal()`'s opening descriptor's
+  `segmentation_event_id`. The **opening descriptor** is the first segmentation descriptor of the
+  section not cancelled whose `segmentation_type_id` makes an out (cue-injection §6.2): 0x22, 0x30,
+  0x32, 0x34 or 0x36.
+- **Its duration**, in 90 kHz ticks: a `splice_insert()`'s `break_duration()` `duration`, when its
+  duration flag is 1; a `time_signal()`'s opening descriptor's `segmentation_duration`, when
+  flagged.
+- **Its slots**: the `sub_segments_expected` of its first segmentation descriptor not cancelled
+  whose `segmentation_type_id` is a placement opportunity start, 0x34 or 0x36, when that
+  descriptor carries the sub-segment fields and `sub_segments_expected` is above 0.
+
+A section states nothing more. An encrypted section, a command this text does not read, and a
+`time_signal()` with no opening descriptor state no id and no duration; a form 2 message and a cue
+of form 0 have no section.
+
+### 5.3 The section and the cue's summary
+
+A producer **MUST NOT** write a summary its message contradicts (live-events §4.3). An opening
+cue's section is refused `cue_section_mismatch` when:
+
+- it is a `splice_insert()` whose cancel indicator is 1, or whose `out_of_network_indicator` is 0:
+  it states a cancellation or a return, and the cue opens a break;
+- it states an id that is not the cue's `cue_id`;
+- it states a duration *d* ticks and ⌊*d* / 90⌋ is not the cue's `duration_ms`.
+
+## 6. Attribution
+
+A break is attributed as revenue-share §6 attributes an impression, by its start:
+
+- a cued break: its **run** is the run whose window holds its start, and its **entry** the entry of
+  that run's schedule whose span holds it. One with no run, or a run and no entry, aired in no
+  window the verifier holds, and is refused `outside_window`;
+- a scheduled break: its run and entry are those of §4.2.
+
+The entry gives the **asset**: a programme's own `asset_id`, or, for an entry that is not a
+programme, the asset the contract's rule gives (revenue-share §6.2), or none. A break with an asset
+is attributed to the asset's split; an asset the contract does not map is refused
+`asset_unmapped`. A break with no asset is attributed to the contract's between split.
+
+## 7. The opportunity report
+
+### 7.1 Layout
+
+| field | size | meaning |
+|---|---|---|
+| `magic` | 4 | `WOR1` (ASCII) |
+| `version` | 1 | 1 in this revision |
+| `issuer` | 32 | the key that signs the report |
+| `contract` | 32 | the contract's digest (revenue-share §3.3) |
+| `party` | 32 | the party it is for: the operator or an owner |
+| `start`, `end` | 8 each | u64: the period it states |
+| `rooms` | 2 + 32 × *m* | a u16 count, then each room's id, in strictly ascending order |
+| `runs` | 2 + 32 × *r* | a u16 count, then each run's identity (revenue-share §4.2), in strictly ascending order |
+| `lines` | 2 + 75 × *l* | a u16 count, then each line (§7.2), in strictly ascending order of (`split`, `class`) |
+| `breaks` | 8 | u64: the sum of the lines' breaks |
+| `break_ms` | 8 | u64: the sum of the lines' `break_ms` |
+| `slots` | 8 | u64: the sum of the lines' slots |
+| `sig` | 64 | §7.4 |
+
+### 7.2 Lines
+
+A line is 75 bytes:
+
+| field | size | meaning |
+|---|---|---|
+| `split` | 2 | u16: the split's index |
+| `class` | 1 | 1 cued, 2 scheduled (§4.3) |
+| `breaks` | 8 | u64: the breaks of the class attributed to the split |
+| `break_ms` | 8 | u64: the sum of their durations, in milliseconds |
+| `slots` | 8 | u64: the sum of their slots |
+| `unslotted` | 8 | u64: those of them with no slots (§4.4) |
+| `ppm` | 4 | u32: the party's share of the split |
+| `cited` | 4 | u32: the records the line cites (§7.3) |
+| `cites` | 32 | their citation digest (§7.3) |
+
+There is one line for each split of which the party holds a share (revenue-share §3.2) and each
+class with at least one break attributed to that split, and none other. A report so states every
+opportunity of every split the party shares in, and the share by which it shares it.
+
+### 7.3 Citations
+
+Each line cites the records its breaks came from: for a cued break, its opening cue and its
+closing cue (kind 12, each by its event digest, live-events §3.2), its room's policy when its slots
+are the policy's (kind 13, the policy's digest, live-ads §3.2), and its run (kind 10, its identity);
+for a scheduled break, its run (kind 10). `cited` is their number, each record counted once, and
+`cites` is SHA-256 over the bytes `wai:opportunity-cites` (ASCII) and 0x01, followed by each cited
+record's `kind` (u8) and identity (32), in ascending order of (`kind`, identity). Kind 10 is
+revenue-share §7.4's; 12 and 13 are this text's.
+
+### 7.4 Digest and signature
+
+The **digest** of a report is SHA-256 over its bytes before `sig`. Its signature is Ed25519 by
+`issuer` over the bytes `wai:opportunity-report` (ASCII) and 0x01, followed by the bytes the digest
+covers, verified strictly ([SPEC](../SPEC.md) §7 *Signatures*): a key that fails step 1 or 2 is
+`bad_key`, and a signature that fails a later step is `bad_signature`.
+
+### 7.5 Reading and rules
+
+A reader reads exactly the bytes it is given as one report, in the order of §7.1, and refuses at
+the first of these that holds: fewer than 4 bytes, `truncated`; a magic other than `WOR1`,
+`malformed`; no fifth byte, `truncated`; a version other than 1, `unknown_version`; the bytes end
+before a field the layout requires, `truncated`; bytes after `sig`, `malformed`. It then refuses
+as `opportunity_report_invalid` a report that breaks any of these:
+
+- `start` is below `end`; `issuer` and `party` are not zero;
+- `rooms`, `runs` and `lines` are each in the strictly ascending order §7.1 gives it;
+- each line's `class` is 1 or 2, its `breaks` and `cited` above 0, its `unslotted` at most its
+  `breaks`, and its `ppm` 1 to 10^6.
+
+## 8. Verifying a report
+
+### 8.1 Inputs
+
+A verifier is given the **contract**, the **other contracts** it holds of the operator or the
+channel, the **report**, the **runs** and the **rooms**. Its verification document holds them as
+one JSON object (RFC 8259) with exactly the members `contract` and `report` (hexadecimal),
+`contracts` (a list of hexadecimal strings), `runs` (a list of runs in their carriage,
+revenue-share §4.1) and `rooms` (a list of rooms, each an object with exactly the members
+`descriptor` and `policy` (hexadecimal), `grants` (a list of hexadecimal strings), `key_log` (a
+string or `null`) and `chains` (a list of lists of hexadecimal strings, each a principal's events
+in order)). A document that is not such an object is refused `malformed`.
+
+### 8.2 Steps
+
+It runs these steps and stops at the first refusal, which it reports with the reason and where:
+
+1. **The contract**, at `contract`, as revenue-share §8.2 step 1.
+2. **The other contracts**, each at `contracts` and its index, as revenue-share §8.2 step 2
+   (`contract_overlap` among its reasons).
+3. **The report**, at `report`: it reads (§7.5: `truncated`, `malformed`, `unknown_version`,
+   `opportunity_report_invalid`); its `contract` is the contract's digest and its `party` the
+   operator or an owner of the contract: otherwise `contract_mismatch`; its period lies within the
+   contract's: otherwise `outside_contract`; its signature verifies under its issuer (§7.4):
+   `bad_key`, `bad_signature`.
+4. **The runs**, each at `run` and its index, as revenue-share §8.2 step 4 (`malformed`,
+   `run_invalid`, `run_foreign`, `run_overlap`).
+5. **The rooms**, each at `room` and its index: it reads (`malformed`); it verifies (§3.3), a
+   refusal being live-ads' reason with live-ads' place after the index, and a gap
+   `delivery_gap`; its id is a carrier (`room_foreign`) and not that of a room before it
+   (`room_repeated`).
+6. **The cued breaks** in the period (§4.3), the rooms in order and each room's breaks in its
+   schedule's order, each at `room`, the room's index, `break` and the break's index in its
+   room's schedule: its section, when it has one, reads (§5.1: `cue_section_invalid`) and agrees
+   with its opening cue (§5.3: `cue_section_mismatch`); its span shares an instant with the span
+   of a cued break in the period of a room before it: `break_overlap` (two rooms that carry the
+   channel at once would count one break twice); it is placed and attributed (§6:
+   `outside_window`, `asset_unmapped`).
+7. **The scheduled breaks** in the period, in the order of §4.2, each at `run`, the run's index in
+   the document, `entry` and the entry's index: attributed (§6: `asset_unmapped`).
+8. **The figures**, at `report`, recomputed as §7.2 and §7.3 compute them for the report's party,
+   and compared in this order:
+   1. a line whose split and class give the party no break, or that states more breaks than they
+      give: `line_unsourced`;
+   2. a line whose `cited` or `cites` is not the records it came from: `citation_mismatch`;
+   3. any other difference (the rooms, the runs, a line missing, a figure of a line, a total):
+      `opportunity_report_mismatch`.
+
+A figure that cannot be held in its field is a difference.
+
+### 8.3 Outcome
+
+- **refuse**: the reason and where.
+- **accept**: the report's digest; the contract's digest; the issuer; the party and whether it is
+  the operator or an owner; the period; the rooms and the runs; each break in the period, in the
+  order of steps 6 and 7, with its class, its room and its index there (a cued break) or its run
+  and entry (a scheduled break), its opening cue's digest or `null`, its start, its duration,
+  whether it is open, its slots and where they came from (`section`, `policy` or `null`), what its
+  section states (`null` without one), its run, entry and asset, its split, and the records it
+  cites; each line, with its cited records; and the totals.
+
+A break of a split the party holds no share of is stated with the others, and counted in no line
+of the party's: the outcome shows each party the whole channel's breaks in the period, and its
+report states those it shares in.
+
+## 9. The reported statement
+
+A **reported statement** is what a platform reports it counted for a channel and a period. It is
+an input, never a signed WAI record and never evidence: a check (§10) names it by the digest of its
+bytes, and states it beside what the records prove. A platform's own report is turned into one of
+these two forms outside this text.
+
+### 9.1 JSON
+
+One JSON object (RFC 8259) with exactly these members, and optionally `days` and `programmes`:
+
+| member | value |
+|---|---|
+| `channel` | a string: the channel's id, 1 to 1024 bytes of UTF-8 |
+| `start`, `end` | integers: the period, in microseconds since 1970 |
+| `currency` | a string of three capitals `A`–`Z` (ISO 4217) |
+| `basis` | `gross`, for revenue before the contract's split, or `share`, for the party's part |
+| `impressions` | an integer: the impressions reported for the period |
+| `revenue` | an integer: the revenue reported, an amount (receipt-ledger §2: millionths of a minor unit) |
+| `days` | a list of objects, each with exactly `day` (a day, §2), `impressions` and `revenue` |
+| `programmes` | a list of objects, each with exactly `asset` (an `asset_id`, 1 to 1024 bytes of UTF-8), `impressions` and `revenue` |
+
+An integer is a JSON integer from 0 to 2^64 − 1. An empty list is the same as its member left out.
+
+### 9.2 CSV
+
+A text of RFC 4180 records, each ended by CRLF or LF (the last line break optional), each of
+exactly four fields. A field is unquoted, holding no comma, double quote, CR or LF, or quoted: a
+double quote, any bytes with each double quote doubled, and a double quote. The first record is
+`scope,key,impressions,revenue`. Then, in this order:
+
+- `channel`, `start`, `end`, `currency` and `basis`, each once, its value in `key` and the last two
+  fields empty;
+- `period`, once, `key` empty, and the period's `impressions` and `revenue`;
+- each `day`, its day in `key`, then each `programme`, its asset in `key`, each with its
+  `impressions` and `revenue`.
+
+An integer is `0`, or a digit 1 to 9 followed by digits, at most 2^64 − 1. The text read is the
+JSON form with the same values.
+
+### 9.3 Rules
+
+A reported statement is refused `reported_invalid` when its text is not one of these forms, or:
+
+- its `start` is not below its `end`;
+- a day is not a date of the Gregorian calendar from 1970 to 9999, or its span does not lie within
+  the period, or the days are not in strictly ascending order;
+- the programmes are not in strictly ascending order of `asset`'s bytes.
+
+It is refused `reported_foreign` when its `channel` is not the contract's, its `currency` not the
+contract's, or its period not the report's.
+
+## 10. The statement check
+
+### 10.1 Layout
+
+| field | size | meaning |
+|---|---|---|
+| `magic` | 4 | `WCK1` (ASCII) |
+| `version` | 1 | 1 in this revision |
+| `issuer` | 32 | the key that signs the check |
+| `report` | 32 | the report's digest (§7.4) |
+| `reported` | 32 | SHA-256 over the reported statement's bytes, as given |
+| `form` | 1 | 1 JSON (§9.1), 2 CSV (§9.2) |
+| `statement` | 32 | the digest of the signed revenue-share statement set beside it (revenue-share §7.5), or zero |
+| `floor_ppm`, `ceiling_ppm` | 4 each | u32: the bounds of §10.3, in millionths of the period's rate |
+| `lines` | 2 + … | a u16 count, then each line (§10.2), in strictly ascending order of (`scope`, `key`'s bytes) |
+| `sig` | 64 | §10.5 |
+
+### 10.2 Lines
+
+| field | size | meaning |
+|---|---|---|
+| `scope` | 1 | 1 the period, 2 a day, 3 a programme |
+| `key` | text | empty for the period; the day (`YYYY-MM-DD`); the programme's `asset_id` |
+| `breaks`, `break_ms`, `slots`, `unslotted` | 8 each | u64: the opportunities of the scope (§10.3) |
+| `impressions`, `revenue` | 8 each | u64: the reported figures of the scope |
+| `fill_ppm` | 8 | u64: the implied fill (§10.3) |
+| `revenue_per_slot` | 8 | u64: an amount (§10.3) |
+| `signed` | 1 | 1 when signed figures follow, 0 otherwise |
+| `signed_impressions`, `signed_revenue` | 8 each | only when `signed` is 1: §10.4 |
+| `flags` | 1 | §10.3 and §10.4 |
+
+There is one line of the period, and one line for each day and each programme the reported
+statement lists, and none other.
+
+### 10.3 Figures and flags
+
+The **opportunities** of a line are the report's breaks in the period that are counted in a line
+of the report's (§7.2), restricted to its scope: every one for the period; those whose start lies
+within the day's span for a day; those whose asset (§6) is the programme's for a programme. A break
+with no asset is in no programme's line. `breaks`, `break_ms`, `slots` and `unslotted` are their
+count and sums, as §7.2 sums them.
+
+- `fill_ppm` is ⌊`impressions` × 10^6 / `slots`⌋ and `revenue_per_slot` ⌊`revenue` / `slots`⌋,
+  computed in integers wide enough not to overflow, a quotient above 2^64 − 1 held as 2^64 − 1;
+  both are 0 when `slots` is 0. The implied fill is impressions per slot: a break's slots are
+  filled once per viewer, so it is the audience times the share of slots filled, and no record of
+  this text states an audience.
+- The **rate** is the period line's `fill_ppm`.
+
+A line's `flags` are these bits:
+
+| bit | name | set when |
+|---|---|---|
+| 0 | `unproved` | `impressions` is above 0 and `breaks` is 0: a figure no break the records prove stands behind |
+| 1 | `above` | not the period's line, its `slots` and the period's above 0, and `fill_ppm` × 10^6 > rate × `ceiling_ppm` |
+| 2 | `below` | not the period's line, its `slots` and the period's above 0, and `fill_ppm` × 10^6 < rate × `floor_ppm` |
+| 3 | `impressions_above_signed` | `signed` is 1 and `impressions` > `signed_impressions` |
+| 4 | `impressions_below_signed` | `signed` is 1 and `impressions` < `signed_impressions` |
+| 5 | `revenue_above_signed` | `signed` is 1 and `revenue` > `signed_revenue` |
+| 6 | `revenue_below_signed` | `signed` is 1 and `revenue` < `signed_revenue` |
+
+Every other bit is 0. `above` and `below` are relative to the period's own rate, at bounds the
+issuer chooses and the check states: a day or programme far from the rest of the period. A
+reported statement low in every line is low against nothing but the signed statement (§10.4).
+
+### 10.4 The signed statement beside it
+
+Where the operator's signed revenue-share statement of the report's contract, party and period is
+given, verified as revenue-share §8 verifies it, the period's line is `signed`, and states:
+
+- `signed_impressions`: the sum of the statement's lines' `impressions`;
+- `signed_revenue`: for the basis `gross`, the sum of its lines' `revenue`; for `share`, its
+  `total`, the party's part.
+
+So the three stand side by side: the opportunities the cues and runs prove, the impressions and
+revenue the invoices' signed records prove, and the figures the platform reported. A day's or a
+programme's line is never `signed`: the statement's lines are per split, and the party's part is
+rounded once per line (revenue-share §7.3).
+
+### 10.5 Digest and signature
+
+The **digest** of a check is SHA-256 over its bytes before `sig`. Its signature is Ed25519 by
+`issuer` over the bytes `wai:statement-check` (ASCII) and 0x01, followed by the bytes the digest
+covers, verified strictly (SPEC §7 *Signatures*).
+
+### 10.6 Reading and rules
+
+A reader reads exactly the bytes it is given as one check, as §7.5 reads a report with `WCK1` for
+`WOR1` (`truncated`, `malformed`, `unknown_version`), and refuses as `statement_check_invalid` one
+that breaks any of these:
+
+- `issuer` is not zero; `form` is 1 or 2; `floor_ppm` is at most 10^6 and `ceiling_ppm` at least
+  10^6;
+- its first line is of scope 1 with an empty key, and no other line is of scope 1; the lines are in
+  the strictly ascending order §10.1 gives them; each `scope` is 1, 2 or 3; a day's key is a day
+  (§9.3) and a programme's 1 to 1024 bytes of UTF-8;
+- `signed` is 0 or 1, and 1 only on the period's line; no bit of `flags` above bit 6 is set.
+
+## 11. Verifying a check
+
+### 11.1 Inputs
+
+A check's verification document is one JSON object with exactly the members `report` (a report's
+verification document, §8.1), `reported` (an object with exactly `form`, `json` or `csv`, and
+`text`, the reported statement's text), `statement` (a revenue-share verification document,
+revenue-share §8.1, or `null`) and `check` (hexadecimal). A document that is not such an object is
+refused `malformed`. The reported statement's bytes are `text` in UTF-8.
+
+### 11.2 Steps
+
+It runs these steps and stops at the first refusal:
+
+1. **The report**, at `report` and the place §8.2 gives: every reason of §8.
+2. **The reported statement**, at `reported`: it reads in its form and keeps §9.3's rules
+   (`reported_invalid`), and is of the contract's channel and currency and the report's period
+   (`reported_foreign`).
+3. **The signed statement**, when given, at `statement` and the place revenue-share §8.2 gives:
+   every reason of revenue-share §8; it is of the report's contract, party and period, or it is
+   refused `statement_foreign`.
+4. **The check**, at `check`: it reads (§10.6: `truncated`, `malformed`, `unknown_version`,
+   `statement_check_invalid`); its signature verifies under its issuer (§10.5: `bad_key`,
+   `bad_signature`); and its `report`, `reported`, `form` and `statement` are those given and its
+   lines those §10.2 to §10.4 compute at its own bounds: otherwise `statement_check_mismatch`.
+
+### 11.3 Outcome
+
+- **refuse**: the reason and where.
+- **accept**: the check's digest; the issuer; the report's digest, its party and period; the
+  reported statement's digest, form and basis; the signed statement's digest or `null`; the
+  bounds; and each line with its figures and the names of its flags.
+
+## 12. Operations
+
+`wai` runs the operations of this extension, under the agent rules of the operation catalogue (the
+`--json` envelope, the exit codes, `--dry-run` on every operation that writes, `--yes` before a file
+is replaced). A refusal by this text has its reason as the operation's code.
+
+| operation | command line | does |
+|---|---|---|
+| `opportunity.create` | `wai opportunity create <inputs.json> --party <key> --start µs --end µs --key <file> [--out F]` | the report of a party and a period, computed from a verification document without its report (§8.1), signed by the issuer key, written with its document |
+| `opportunity.verify` | `wai opportunity verify <document.json>` | a report's (§8.1) or a check's (§11.1) verification document: its outcome; exit 1 with the reason on a refusal |
+| `statement.check` | `wai statement check <report.json> <reported> [--statement <document.json>] [--floor ppm] [--ceiling ppm] --key <file> [--out F]` | the check of a reported statement (JSON, or CSV for a file named `.csv`) against a report's verification document and, when given, a signed statement's, at the bounds given (500000 and 2000000 when not), signed by the issuer key, written with its document |
+
+## 13. Reasons
+
+The codes this extension adds, each with where it is raised:
+
+| reason | raised at |
+|---|---|
+| `room_foreign` | §3.3, §8.2 step 5 |
+| `room_repeated` | §3.3, §8.2 step 5 |
+| `cue_section_invalid` | §5.1, §8.2 step 6 |
+| `cue_section_mismatch` | §5.3, §8.2 step 6 |
+| `opportunity_report_invalid` | §7.5, §8.2 step 3 |
+| `opportunity_report_mismatch` | §8.2 step 8 |
+| `reported_invalid` | §9.3, §11.2 step 2 |
+| `reported_foreign` | §9.3, §11.2 step 2 |
+| `statement_foreign` | §11.2 step 3 |
+| `statement_check_invalid` | §10.6, §11.2 step 4 |
+| `statement_check_mismatch` | §11.2 step 4 |
+
+A verifier of this extension also raises, with the meaning this text gives them: `truncated`,
+`malformed` and `unknown_version` for a report or a check that does not read, and `malformed` for a
+document or a room that does not read; `bad_key` and `bad_signature` for their signatures;
+`contract_mismatch` and `outside_contract` (revenue-share §11) for a report of another contract or
+past its period; `delivery_gap` (live-events §6.4) for a room with a gap; `break_overlap` (live-ads
+§4.3) for the breaks of two rooms at once; `outside_window` and `asset_unmapped` (revenue-share §11)
+for a break no window places and an asset the contract does not map; `line_unsourced` and
+`citation_mismatch` for a line, as revenue-share raises them; and, at a contract, a run, a room or
+a signed statement, every code revenue-share and live-ads raise there.
+
+## 14. Conformance
+
+[`live-conformance/opportunity/`](../live-conformance/opportunity/) holds the corpus, in one file,
+`vectors.json`, written by `wai_opportunity_vectors gen` from fixed seeds. The contracts, runs,
+rooms, ledger documents and statements are held once, by name, and each vector is a report's or a
+check's verification document naming them, with the outcome §8.3 or §11.3 gives it:
+
+- **Accepted**: a channel's day under a contract of two owners: two windows airing each owner's
+  programmes, a room whose producer cues breaks inside them, with SCTE 35 sections of every kind
+  §5 reads (a `splice_insert()` with a break duration, a `time_signal()` with a placement
+  opportunity stating its slots, one whose type states none, a `splice_insert()` carrying a
+  segmentation descriptor) and cues of form 0, a break inside an ad entry, and an ad entry no cue
+  covers; the reports of both owners and of the operator, and one made from the runs alone; and
+  checks of reported statements in JSON and in CSV, with and without the operator's signed
+  statement of the day, one under-reporting an owner's programme, one reporting impressions in a
+  programme with no break.
+- **Refused**: each reason of §13 at least once, each vector a control of one defect; each code
+  §13 reuses; and a refusal at a contract, a run, a room and a signed statement, at its place.
+
+`wai_opportunity_vectors verify` and the test `tests/opportunity_report.rs` check that the file
+regenerates byte for byte, that `wai-rs` gives every vector its outcome, that every reason of §13
+refuses a vector, and that §13 lists exactly the reference's codes; the test also holds the worked
+example, a channel's day of two owners whose reported statement under-reports one owner's breaks,
+with the check that shows it, computed and then recomputed from the public records alone.
+`live-conformance/opportunity_report_verify.py` is the second implementation, written from this
+text: it shares no code with `wai-rs`, reads every report, check, section and reported statement
+itself, verifies contracts, runs and signed statements with `revenue_share_verify.py` and rooms with
+`live_ads_verify.py`, recomputes every break, attribution, line, citation and flag, gives every
+vector the same outcome, requires every mutated copy of the corpus to fail, and drops each of its
+own checks in turn and requires the corpus to catch the weakened verifier.
+
+## 15. Security and privacy considerations
+
+- **What a report proves.** A break in a report is one the room's own cues opened, signed by a
+  principal the room's grants permit to cue, or an ad entry the channel signer signed as aired,
+  placed in a window the channel signer signed. Nothing of it rests on the platform's figures or
+  on the issuer's word: anyone holding the records computes the same report.
+- **What it does not.** Opportunities are per break, not per viewer: a report says what was on air
+  to be sold, not how many saw it. The fill of a check is therefore impressions per slot, and its
+  `above` and `below` flags are relative to the period's own rate. Only a signed statement states
+  signed impressions; where none is given, a reported statement uniformly low or high is not
+  flagged by the report alone.
+- **What the operator still controls.** A room the contract does not name, or a channel carried
+  without cues or runs, proves no opportunity; the contract's carriers and its channel signer are
+  what the owners agreed to. Two rooms carrying the channel at once are refused rather than
+  counted twice (`break_overlap`), and so are a cue whose message its summary contradicts and a
+  break no window places.
+- **The reported statement.** It is labelled and kept apart: a check names it by the digest of its
+  bytes, and no figure of it changes a report. A platform that disputes a check recomputes it from
+  the same records and its own reported bytes.
+- **What a document reveals.** A report's document holds the room's chains, whose events name the
+  principals of the room and its other events (chat among them, live-events §4.4); a check's holds
+  a signed statement's, with the ledger's sources (revenue-share §13). Each travels between the
+  owner, the operator, the platform and an auditor they choose.
diff --git a/wai/live-conformance/opportunity/README.md b/wai/live-conformance/opportunity/README.md
new file mode 100644
index 000000000..432618e63
--- /dev/null
+++ b/wai/live-conformance/opportunity/README.md
@@ -0,0 +1,87 @@
+# live-conformance/opportunity — the opportunity report and the statement check
+
+The corpus of [`extensions/opportunity-report.md`](../../extensions/opportunity-report.md) §14, in
+one file, `vectors.json`:
+
+- `contracts`: share contracts (revenue-share §3), by name, each hexadecimal;
+- `runs`: the channel's program-as-run windows, by name, each in its carriage (revenue-share §4.1);
+- `rooms`: rooms, by name, each as a report's document holds one (§8.1): its `descriptor`, `grants`,
+  `key_log`, `chains` and `policy`;
+- `ledgers`: ledger documents (receipt-ledger §7.1), by name, each whole, for the signed
+  statements;
+- `reported`: reported statements (§9), by name, each its `form` and `text`;
+- `vectors`: verification documents, each of `kind` `report` (§8.1: the names of its `contract`,
+  other `contracts`, `runs` (or `null`) and `rooms`, and its `report` in hexadecimal) or `check`
+  (§11.1: such a `report`, the name of its `reported` statement, its signed `statement` (the name
+  of its contract, the statement in hexadecimal, the names of its runs and ledgers) or `null`, and
+  its `check` in hexadecimal), with the `outcome` §8.3 or §11.3 gives it;
+- `keys`: the operator's, the two owners', the channel signer's, the auditor's, the room
+  producer's and the ad decider's public keys.
+
+**Equivalence.** For each vector, a conforming verifier given its parts, resolved by name, reaches
+the outcome the vector states:
+
+- `refuse`: the `reason` and where, `at`: `[]` for the document; `["contract"]` and the places
+  revenue-share §8.2 gives; `["report"]`; `["run", k]`; `["room", k]`, followed by live-ads' own
+  place for a room live-ads refuses; `["room", k, "break", i]` for a cued break (its index in its
+  room's schedule); `["run", k, "entry", e]` for a scheduled break; for a check, `["report", …]`,
+  `["reported"]`, `["statement", …]` and `["check"]`;
+- `accept`, for a report: its digest, the contract's, the `issuer`, the `party` and its `role`,
+  `start` and `end`, the `rooms` and `runs`, each break in the period (its class, its room and
+  index or the run and entry it was taken in, its opening `cue`, its `start`, `duration_ms`,
+  whether it is `open`, its `slots` and where they came from, what its `section` states, its run,
+  entry, asset and split, and the records it `cites`), each line (split, class, breaks,
+  `break_ms`, slots, unslotted, `ppm`, `cites`), and the `totals`;
+- `accept`, for a check: its digest, the `issuer`, the report's digest, `party`, `start` and
+  `end`, the reported statement's digest, `form` and `basis`, the signed `statement`'s digest or
+  `null`, the bounds, and each line with its figures, its `signed` figures or `null`, and the names
+  of its `flags`.
+
+The channel, `fast-9`, airs two windows of 2026-10-16: the first hour (owner A's `a/ep-1`, the ad
+slot `slate-90`, owner B's `b/doc-1`) and the second (A's `a/ep-2`, the ad slot `mid-60`, B's
+`b/doc-2`). Its contract maps each owner's programmes to a split of its own (a third to A and two
+thirds to the operator; three fifths to B and two fifths to the operator), names a between split
+of halves to the two owners, and the rule preceding. The room's producer cues eight breaks: an out
+and its in carrying a `splice_insert()` with a break duration (slots from the room's policy, two),
+breaks of type 4 carrying `time_signal()`s with provider and distributor placement opportunities
+stating three or four slots, one of them inside `slate-90`, an out and its in with such a section,
+a `splice_insert()` carrying a placement opportunity of three slots, a provider advertisement
+start (a type that states no slots), and a cue of form 0. No cue covers `mid-60`, which is a
+scheduled break, unslotted. The ledger document bills three viewers' receipts for every break,
+two impressions each; the signed statements are the operator's, of the same day.
+
+The accepted vectors:
+
+- `owner_a_day`, `owner_b_day`, `operator_day`: the day's reports, each signed by the party it is
+  for;
+- `owner_a_runs_alone`: A's day from the runs alone, both ad slots scheduled;
+- `owner_b_two_rooms`: B's day under a contract naming a second room, whose break overlaps none;
+- `check_owner_b_under_reported`: B's platform reports twelve impressions for `b/doc-1` and two for
+  `b/doc-2`, which holds as many slots: `b/doc-2` is `below` the day's rate, and the day is below
+  the signed statement's twenty-four impressions and B's signed part;
+- `check_owner_a_csv`: A's reported statement in CSV, per day, as the signed statement states it:
+  nothing flagged;
+- `check_owner_b_without_statement`, `check_owner_b_reports_a_programme`: B's report alone beside
+  the same figures, and beside figures listing A's episode, which is `unproved` (no break of B's
+  aired in it).
+
+Every other vector is refused, a control of one defect: each reason of §13, each code it reuses,
+and a refusal at a contract, a run, a room and a signed statement, at its place.
+
+**Provenance.** Generated here: `wai_opportunity_vectors gen` writes `vectors.json` from fixed
+seeds (the operator, the owners, the channel signer, the auditor, the buyer, and the room's
+authority, clock, producer and decider). Nothing here was fetched from outside the repository.
+
+Regenerate and check:
+
+    cd wai/wai-rs
+    cargo run -q --no-default-features --features opportunity_report --bin wai_opportunity_vectors -- gen ../live-conformance/opportunity
+    cargo run -q --no-default-features --features opportunity_report --bin wai_opportunity_vectors -- verify ../live-conformance/opportunity
+    cargo test -q --no-default-features --features opportunity_report --test opportunity_report
+    python3 -I ../live-conformance/opportunity_report_verify.py ../live-conformance/opportunity
+
+The second implementation, `opportunity_report_verify.py`, shares no code with `wai-rs`. It reads
+every report, check, section and reported statement itself, verifies contracts, runs and signed
+statements with `revenue_share_verify.py` and rooms with `live_ads_verify.py`, recomputes every
+break, attribution, line, citation and flag, requires every mutated copy of the corpus to fail, and
+requires the corpus to catch it with each of its own checks dropped.
diff --git a/wai/live-conformance/opportunity/vectors.json b/wai/live-conformance/opportunity/vectors.json
new file mode 100644
index 000000000..d82977666
--- /dev/null
+++ b/wai/live-conformance/opportunity/vectors.json
@@ -0,0 +1,5714 @@
+{
+  "corpus": "wai.delivery.opportunity",
+  "extension": "extensions/opportunity-report.md",
+  "keys": {
+    "operator": "c877eed124620b99473412566e9172e9f0096f982c9bd0b3dc2ad218598b73fd",
+    "owner_a": "50e157ddcb30ee565b284ce4e78553f33f47aa748694d3da629c2ceeabbf06a9",
+    "owner_b": "72e1f3d8bbd19fa97aa01b5f5c795cfede961b22e046c5e207783e9f1b129e76",
+    "channel_signer": "2825712d541b726f62f8d2c070ca11121adc6d33fed2a2c210b7c77b2627f972",
+    "auditor": "81640fe9c7b63a1babed05713ed2f9958aa011b8d31edcf9c611f37513868737",
+    "producer": "a6653ade784fbd8bee3dc43ec744f14df88f291d0348b6968f281080787d027b",
+    "decider": "269c84800120bea84113782ff676db00ced0fc028987b9e467d7b5883223d2ad"
+  },
+  "contracts": {
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+    "offered": "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",
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+        "runs": null,
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "malformed",
+        "at": []
+      }
+    },
+    {
+      "name": "contract_offered",
+      "about": "a contract owner B has not countersigned",
+      "kind": "report",
+      "report": {
+        "contract": "offered",
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+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "not_countersigned",
+        "at": [
+          "contract",
+          "owner",
+          1
+        ]
+      }
+    },
+    {
+      "name": "contract_overlap",
+      "about": "another contract of the channel whose period overlaps the contract's",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [
+          "overlapping"
+        ],
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+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "contract_overlap",
+        "at": [
+          "contracts",
+          0
+        ]
+      }
+    },
+    {
+      "name": "report_truncated",
+      "about": "a report of ten bytes",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "574f52310150e157ddcb",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "truncated",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_magic",
+      "about": "a report whose magic is WOR2",
+      "kind": "report",
+      "report": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "malformed",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_version_2",
+      "about": "a report of version 2",
+      "kind": "report",
+      "report": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "unknown_version",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_lines_unordered",
+      "about": "a report whose lines are not in ascending order",
+      "kind": "report",
+      "report": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "opportunity_report_invalid",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_of_another_contract",
+      "about": "a report naming the contract of two rooms",
+      "kind": "report",
+      "report": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "contract_mismatch",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_past_the_contract",
+      "about": "a report whose period ends a day after the contract's",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "outside_contract",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_signature",
+      "about": "a report whose signature has a byte flipped",
+      "kind": "report",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "bad_signature",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "report_issuer_small_order",
+      "about": "a report whose issuer key is of small order",
+      "kind": "report",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "bad_key",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "run_aired_misstated",
+      "about": "a run whose aired set the window does not give, signed again",
+      "kind": "report",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1_aired_misstated",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "run_invalid",
+        "at": [
+          "run",
+          0
+        ]
+      }
+    },
+    {
+      "name": "run_of_another_channel",
+      "about": "a run of another channel, by the same signer",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "fast_8"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "run_foreign",
+        "at": [
+          "run",
+          1
+        ]
+      }
+    },
+    {
+      "name": "runs_overlapping",
+      "about": "a third run whose window overlaps the first's",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2",
+          "hour_1_overlapping"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "run_overlap",
+        "at": [
+          "run",
+          2
+        ]
+      }
+    },
+    {
+      "name": "room_event_signature",
+      "about": "a room whose producer's third event has a byte of its signature flipped",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "574f52310150e157ddcb30ee565b284ce4e78553f33f47aa748694d3da629c2ceeabbf06a935f70c24cbf3d26f057396f0bb769784626a435817df7a29ca079af73a288d2d50e157ddcb30ee565b284ce4e78553f33f47aa748694d3da629c2ceeabbf06a900406cd8e95d060000a043f6fd5d06000100ab0ba2efcd8120e9f47d1f3aff234fe032622cc50b65d74824053bf5790f87c702000499a301829cd05163c98ca0556df7a2e69fbed31b19bba77544a6fbbec1d13efdb22f542d9252a0d5fb1276c2e0f9e31a99ef8b90d592476771f6c2a4f0849b0200000001040000000000000010090500000000000b0000000000000000000000000000001516050008000000188f35a1287439a42c907c36490293d2a0653516616527cf61ef31d493725db0000002010000000000000060ea00000000000000000000000000000100000000000000151605000100000024cfd91282849deb797f1d2a86e9e3d538ce625bb9c2658eec2480fc9591f965050000000000000070f30500000000000b00000000000000714357af6f594f6626fc25d06310464d5e687ee824a475c301ea4d74d6aa57e7c0f73a4933a995cdc11947965a748e8a62108a031e3d43942543f7040be29809",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main_signature_flipped"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "bad_signature",
+        "at": [
+          "room",
+          0,
+          "room",
+          "record",
+          1,
+          2
+        ]
+      }
+    },
+    {
+      "name": "room_with_a_gap",
+      "about": "a room whose producer's chain lacks its fifth event",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main_with_a_gap"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "delivery_gap",
+        "at": [
+          "room",
+          0
+        ]
+      }
+    },
+    {
+      "name": "room_foreign",
+      "about": "a room the contract does not name",
+      "kind": "report",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "backup"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "room_foreign",
+        "at": [
+          "room",
+          0
+        ]
+      }
+    },
+    {
+      "name": "room_repeated",
+      "about": "the contract's room given twice",
+      "kind": "report",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main",
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "room_repeated",
+        "at": [
+          "room",
+          1
+        ]
+      }
+    },
+    {
+      "name": "cue_section_crc",
+      "about": "a room whose second break's section has its CRC damaged",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main_crc_flipped"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "cue_section_invalid",
+        "at": [
+          "room",
+          0,
+          "break",
+          1
+        ]
+      }
+    },
+    {
+      "name": "cue_section_other_id",
+      "about": "a room whose fourth break's section names segmentation event 40 for cue 4",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main_other_segmentation_id"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "cue_section_mismatch",
+        "at": [
+          "room",
+          0,
+          "break",
+          3
+        ]
+      }
+    },
+    {
+      "name": "two_rooms_overlapping",
+      "about": "a second room of the contract's whose break falls inside the first room's second break",
+      "kind": "report",
+      "report": {
+        "contract": "two_rooms",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main",
+          "backup_overlapping"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "break_overlap",
+        "at": [
+          "room",
+          1,
+          "break",
+          0
+        ]
+      }
+    },
+    {
+      "name": "break_outside_every_window",
+      "about": "the run of the first hour alone: the breaks of the second aired in no window held",
+      "kind": "report",
+      "report": {
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+        "runs": [
+          "hour_1"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "outside_window",
+        "at": [
+          "room",
+          0,
+          "break",
+          5
+        ]
+      }
+    },
+    {
+      "name": "asset_unmapped",
+      "about": "a run of the second hour whose last programme the contract does not map",
+      "kind": "report",
+      "report": {
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+        "runs": [
+          "hour_1",
+          "hour_2_unmapped"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "asset_unmapped",
+        "at": [
+          "room",
+          0,
+          "break",
+          6
+        ]
+      }
+    },
+    {
+      "name": "line_of_another_split",
+      "about": "owner A's report with a line of owner B's split",
+      "kind": "report",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "line_unsourced",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "line_citations_changed",
+      "about": "a line whose citation digest has a byte changed",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "citation_mismatch",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "line_seconds_raised",
+      "about": "a line stating a second more of breaks, and the total with it",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "opportunity_report_mismatch",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "runs_listed_short",
+      "about": "a report listing one of the two runs it is given",
+      "kind": "report",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "opportunity_report_mismatch",
+        "at": [
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "check_document_malformed",
+      "about": "a check's document whose reported statement is of a form this text does not define",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "of_another_form",
+      "statement": null,
+      "check": "57434b310172e1f3d8bbd19fa97aa01b5f5c795cfede961b22e046c5e207783e9f1b129e7696d33c89eb4958f751363e3494ae57a42087e758ef56fcad8a549265b903fb7654438b8dc5d20b776871b4e014dd58bbe62d56e4f68d43b228970986bfbe732801092c5f62ff6cad8ed44e04253a5defcbd88f969bfab7ed42f03c777e1309d5d620a1070080841e0003000100000400000000000000407e0500000000000c0000000000000000000000000000000e00000000000000802c8000000000004acd11000000000060ae0a000000000001180000000000000000badb000000000050030700622f646f632d31020000000000000020bf020000000000060000000000000000000000000000000c0000000000000000dd6d000000000080841e0000000000804f1200000000000000030700622f646f632d32020000000000000020bf020000000000060000000000000000000000000000000200000000000000804f1200000000001516050000000000400d03000000000000049305d41c8ef6c826473bf7101a5a684ef0962416da7212ca1706a7a4e207a226221efca94a1eb2bad970287ca8323aee7912e62db6218f5e623969016cc61a0c",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "malformed",
+        "at": []
+      }
+    },
+    {
+      "name": "check_report_refused",
+      "about": "a check whose report has a byte of its signature flipped, refused at the report's place",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_programmes",
+      "statement": {
+        "contract": "main",
+        "statement": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "ledgers": [
+          "day_16"
+        ]
+      },
+      "check": "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",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "bad_signature",
+        "at": [
+          "report",
+          "report"
+        ]
+      }
+    },
+    {
+      "name": "reported_day_outside_the_period",
+      "about": "a reported statement listing a day after its period",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_a_day_after_the_period",
+      "statement": null,
+      "check": "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",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "reported_invalid",
+        "at": [
+          "reported"
+        ]
+      }
+    },
+    {
+      "name": "reported_csv_header",
+      "about": "a reported statement in CSV whose header misspells a column",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "a_days_header_misspelt",
+      "statement": null,
+      "check": "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",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "reported_invalid",
+        "at": [
+          "reported"
+        ]
+      }
+    },
+    {
+      "name": "reported_of_another_channel",
+      "about": "a reported statement of another channel",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_programmes_of_another_channel",
+      "statement": null,
+      "check": "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",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "reported_foreign",
+        "at": [
+          "reported"
+        ]
+      }
+    },
+    {
+      "name": "check_statement_refused",
+      "about": "a signed statement with a byte of its signature flipped, refused at the statement's place",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_programmes",
+      "statement": {
+        "contract": "main",
+        "statement": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "ledgers": [
+          "day_16"
+        ]
+      },
+      "check": "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",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "bad_signature",
+        "at": [
+          "statement",
+          "statement"
+        ]
+      }
+    },
+    {
+      "name": "statement_of_another_owner",
+      "about": "owner B's report beside owner A's signed statement",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
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+        "rooms": [
+          "main"
+        ]
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+      "reported": "b_programmes",
+      "statement": {
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+          "hour_2"
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+          "day_16"
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+        "outcome": "refuse",
+        "reason": "statement_foreign",
+        "at": [
+          "statement"
+        ]
+      }
+    },
+    {
+      "name": "check_truncated",
+      "about": "a check of ten bytes",
+      "kind": "check",
+      "report": {
+        "contract": "main",
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+        "runs": [
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+          "hour_2"
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+        "rooms": [
+          "main"
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+      "reported": "b_programmes",
+      "statement": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
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+        "ledgers": [
+          "day_16"
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+      "check": "57434b310172e1f3d8bb",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "truncated",
+        "at": [
+          "check"
+        ]
+      }
+    },
+    {
+      "name": "check_floor_above_the_rate",
+      "about": "a check whose floor is above the whole",
+      "kind": "check",
+      "report": {
+        "contract": "main",
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+        "runs": [
+          "hour_1",
+          "hour_2"
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+        "rooms": [
+          "main"
+        ]
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+      "reported": "b_programmes",
+      "statement": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "ledgers": [
+          "day_16"
+        ]
+      },
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+      "outcome": {
+        "outcome": "refuse",
+        "reason": "statement_check_invalid",
+        "at": [
+          "check"
+        ]
+      }
+    },
+    {
+      "name": "check_flags_changed",
+      "about": "a check whose flags leave out the programme's below",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_programmes",
+      "statement": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
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+        "ledgers": [
+          "day_16"
+        ]
+      },
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+      "outcome": {
+        "outcome": "refuse",
+        "reason": "statement_check_mismatch",
+        "at": [
+          "check"
+        ]
+      }
+    },
+    {
+      "name": "check_of_another_reported_statement",
+      "about": "a check naming the bytes of another reported statement",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_programmes",
+      "statement": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
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+        "ledgers": [
+          "day_16"
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+      "outcome": {
+        "outcome": "refuse",
+        "reason": "statement_check_mismatch",
+        "at": [
+          "check"
+        ]
+      }
+    },
+    {
+      "name": "check_signature",
+      "about": "a check whose signature has a byte flipped",
+      "kind": "check",
+      "report": {
+        "contract": "main",
+        "contracts": [],
+        "report": "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",
+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "rooms": [
+          "main"
+        ]
+      },
+      "reported": "b_programmes",
+      "statement": {
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+        "runs": [
+          "hour_1",
+          "hour_2"
+        ],
+        "ledgers": [
+          "day_16"
+        ]
+      },
+      "check": "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",
+      "outcome": {
+        "outcome": "refuse",
+        "reason": "bad_signature",
+        "at": [
+          "check"
+        ]
+      }
+    }
+  ]
+}
diff --git a/wai/live-conformance/opportunity_report_verify.py b/wai/live-conformance/opportunity_report_verify.py
new file mode 100644
index 000000000..6f5fac4b1
--- /dev/null
+++ b/wai/live-conformance/opportunity_report_verify.py
@@ -0,0 +1,1110 @@
+#!/usr/bin/env python3
+"""Second implementation of extensions/opportunity-report.md (wai.delivery.opportunity).
+
+Written from the extension's text and sharing no code with wai-rs: it reads every opportunity
+report (WOR1), statement check (WCK1), SCTE 35 section (§5) and reported statement (§9) itself;
+verifies contracts, runs and signed revenue-share statements with revenue_share_verify.py, and
+rooms (their events, grants, policy and the schedule of breaks their cues make) with
+live_ads_verify.py; and recomputes every break, attribution, line, citation and flag.
+
+    python3 -I opportunity_report_verify.py <live-conformance/opportunity>
+    python3 -I opportunity_report_verify.py --document FILE
+
+With a corpus directory it gives every vector of vectors.json its outcome and compares it with the
+one the corpus states, requires every reason of §13 and every code it reuses to refuse a vector,
+requires every mutated copy of the corpus to fail, and drops each of its own checks in turn and
+requires the corpus to catch the weakened verifier. With --document it prints the outcome of one
+report's or check's verification document, status 0 only when it is accepted. Standard library
+only.
+"""
+import copy
+import hashlib
+import json
+import os
+import re
+import sys
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, HERE)
+sys.path.insert(0, os.path.join(HERE, "..", "claim-conformance"))
+import revenue_share_verify as RSV  # noqa: E402
+import live_ads_verify as LAV  # noqa: E402
+import live_rooms_verify as LRV  # noqa: E402
+import live_events_verify as LEV  # noqa: E402
+import ad_presentation_verify as APV  # noqa: E402
+
+EXTENSION = os.path.join(HERE, "..", "extensions", "opportunity-report.md")
+
+REPORT_MAGIC, CHECK_MAGIC = b"WOR1", b"WCK1"                         # §7.1, §10.1
+REPORT_DOMAIN = b"wai:opportunity-report\x01"                        # §7.4
+CHECK_DOMAIN = b"wai:statement-check\x01"                            # §10.5
+CITES_DOMAIN = b"wai:opportunity-cites\x01"                          # §7.3
+CUED, SCHEDULED = 1, 2                                               # §4.3
+CLASS_NAMES = {CUED: "cued", SCHEDULED: "scheduled"}
+RUN_KIND, CUE_KIND, POLICY_KIND = 10, 12, 13                         # §7.3
+PERIOD, DAY, PROGRAMME = 1, 2, 3                                     # §10.2
+SCOPE_NAMES = {PERIOD: "period", DAY: "day", PROGRAMME: "programme"}
+FLAGS = ["unproved", "above", "below", "impressions_above_signed", "impressions_below_signed", "revenue_above_signed",
+         "revenue_below_signed"]                                     # §10.3
+FORMS = {"json": 1, "csv": 2}
+FORM_NAMES = {1: "json", 2: "csv"}
+BASES = {"gross": 1, "share": 2}
+BASIS_NAMES = {1: "gross", 2: "share"}
+WHOLE = 10 ** 6
+U64 = 2 ** 64 - 1
+DAY_US = 86_400_000_000
+ZERO = bytes(32)
+ROOM_CARRIER = 1                                                     # revenue-share §3.1
+OPENING = (0x22, 0x30, 0x32, 0x34, 0x36)                             # §5.2, cue-injection §6.2
+PLACEMENT = (0x34, 0x36)
+SUB_SEGMENTED = (0x30, 0x32, 0x34, 0x36, 0x38, 0x3A, 0x44, 0x46)    # §5.1 step 7
+REUSED = ["truncated", "malformed", "unknown_version", "bad_key", "bad_signature", "contract_mismatch", "outside_contract",
+          "delivery_gap", "break_overlap", "outside_window", "asset_unmapped", "line_unsourced", "citation_mismatch"]
+
+SKIP = set()
+Refuse = RSV.Refuse
+# Pure steps, held once per input: a room's live-ads verification, a run's, a signed statement's.
+_ROOMS, _RUNS, _STATEMENTS = {}, {}, {}
+
+
+def memo(cache, value, f):
+    k = json.dumps(value, sort_keys=True)
+    if k not in cache:
+        cache[k] = f()
+    return cache[k]
+
+
+def sha(*parts):
+    h = hashlib.sha256()
+    for p in parts:
+        h.update(p)
+    return h.digest()
+
+
+def ed_verify(key, msg, sig):
+    return RSV.ed_verify(key, msg, sig)
+
+
+def lowhex(v):
+    """A byte field of a document: lowercase hexadecimal, or None."""
+    if not isinstance(v, str) or len(v) % 2 or any(c not in "0123456789abcdef" for c in v):
+        return None
+    return bytes.fromhex(v)
+
+
+# ---------------------------------------------------------------- §5 the section a cue carries
+
+class Bad(Exception):
+    pass
+
+
+def crc32(b):
+    """ISO/IEC 13818-1 Annex A: 0x04C11DB7, preset all ones, no reflection, no final inversion."""
+    c = 0xFFFFFFFF
+    for x in b:
+        c ^= x << 24
+        for _ in range(8):
+            c = ((c << 1) ^ 0x04C11DB7) & 0xFFFFFFFF if c & 0x80000000 else (c << 1) & 0xFFFFFFFF
+    return c
+
+
+class Bits:
+    """Big-endian bit fields of b, up to the byte `end`; running out is Bad."""
+
+    def __init__(self, b, start, end):
+        self.b, self.at, self.end = b, start * 8, end
+
+    def take(self, n):
+        if self.at + n > self.end * 8:
+            raise Bad()
+        v = 0
+        for _ in range(n):
+            v = (v << 1) | ((self.b[self.at // 8] >> (7 - self.at % 8)) & 1)
+            self.at += 1
+        return v
+
+    def skip(self, nbytes):
+        if self.at // 8 + nbytes > self.end:
+            raise Bad()
+        self.at += 8 * nbytes
+
+
+def splice_time(r):
+    if r.take(1):
+        r.take(6)
+        r.take(33)
+    else:
+        r.take(7)
+
+
+def segmentation(s, start, end):
+    """SCTE 35-1 Table 20 after its identifier, filling [start, end) exactly."""
+    r = Bits(s, start, end)
+    d = {"event_id": r.take(32), "cancelled": r.take(1) == 1, "duration": None, "type": None, "sub": None}
+    r.take(7)
+    if d["cancelled"]:
+        if r.at // 8 != end:
+            raise Bad()
+        return d
+    program, flagged = r.take(1), r.take(1)
+    r.take(6)                                  # delivery_not_restricted_flag and the restriction bits
+    if not program:
+        r.skip(6 * r.take(8))
+    if flagged:
+        d["duration"] = r.take(40)
+    r.take(8)                                  # segmentation_upid_type
+    r.skip(r.take(8))
+    d["type"] = r.take(8)
+    r.take(8)                                  # segment_num
+    r.take(8)                                  # segments_expected
+    left = end - r.at // 8
+    if left == 2 and d["type"] in SUB_SEGMENTED:
+        d["sub"] = (r.take(8), r.take(8))
+    elif left != 0:
+        raise Bad()
+    return d
+
+
+def nothing(command):
+    return {"command": command, "insert": None, "id": None, "duration": None, "slots": None}
+
+
+def read_section(s):
+    """§5.1, for what §5.2 says a section states; Bad is cue_section_invalid."""
+    n = len(s)
+    if n < 20:
+        raise Bad()
+    crc_at = n - 4
+    if crc32(s[:crc_at]) != int.from_bytes(s[crc_at:], "big") and "section-crc" not in SKIP:
+        raise Bad()
+    if s[3] != 0:
+        raise Bad()
+    if s[4] >> 7:
+        return nothing(None)
+    cmd_len = ((s[11] & 0x0F) << 8) | s[12]
+    cmd = s[13]
+    if cmd_len == 0xFFF and cmd not in (0x00, 0x05, 0x06):
+        return nothing(cmd)
+    end = crc_at if cmd_len == 0xFFF else 14 + cmd_len
+    if end > crc_at:
+        raise Bad()
+    r = Bits(s, 14, end)
+    st = nothing(cmd)
+    if cmd == 0x05:                            # splice_insert()
+        st["id"] = r.take(32)
+        cancel = r.take(1) == 1
+        r.take(7)
+        out = False
+        if not cancel:
+            out, program, flagged, immediate = r.take(1) == 1, r.take(1), r.take(1), r.take(1)
+            r.take(4)
+            if program and not immediate:
+                splice_time(r)
+            if not program:
+                for _ in range(r.take(8)):
+                    r.take(8)
+                    if not immediate:
+                        splice_time(r)
+            if flagged:
+                r.take(7)
+                st["duration"] = r.take(33)
+            r.take(16)
+            r.take(8)
+            r.take(8)
+        st["insert"] = (cancel, out)
+    elif cmd == 0x06:                          # time_signal()
+        splice_time(r)
+    elif cmd != 0x00:
+        r.at = end * 8
+    cmd_end = r.at // 8
+    if cmd_len != 0xFFF and cmd_end != end:
+        raise Bad()
+    if cmd_end + 2 > crc_at:
+        raise Bad()
+    p = cmd_end + 2
+    if p + int.from_bytes(s[cmd_end:p], "big") != crc_at:
+        raise Bad()
+    segs = []
+    while p < crc_at:
+        if p + 2 > crc_at:
+            raise Bad()
+        tag, ln = s[p], s[p + 1]
+        if p + 2 + ln > crc_at:
+            raise Bad()
+        if tag == 0x02 and ln >= 4 and s[p + 2:p + 6] == b"CUEI":
+            segs.append(segmentation(s, p + 6, p + 2 + ln))
+        p += 2 + ln
+    live = [d for d in segs if not d["cancelled"]]
+    if cmd == 0x06:
+        opening = next((d for d in live if d["type"] in OPENING), None)
+        if opening is not None:
+            st["id"], st["duration"] = opening["event_id"], opening["duration"]
+    ppo = next((d for d in live if d["type"] in PLACEMENT), None)
+    if ppo is not None and ppo["sub"] is not None and ppo["sub"][1] > 0:
+        st["slots"] = ppo["sub"][1]
+    return st
+
+
+def agrees(st, cue):
+    """§5.3: the section and its opening cue's summary describe one splice."""
+    if st["insert"] is not None and (st["insert"][0] or not st["insert"][1]):
+        return False
+    if st["id"] is not None and st["id"] != cue["cue_id"]:
+        return False
+    return st["duration"] is None or st["duration"] // 90 == cue["duration_ms"]
+
+
+def command_name(c):
+    return {None: "encrypted", 0x05: "splice_insert", 0x06: "time_signal", 0x00: "splice_null"}.get(c, "other")
+
+
+# ---------------------------------------------------------------- §3 the evidence
+
+def the_contract(doc):
+    """§8.2 steps 1 and 2."""
+    c = RSV.contract_at(RSV.unhex(doc["contract"]), ["contract"])
+    for k, h in enumerate(doc["contracts"]):
+        o = RSV.contract_at(RSV.unhex(h), ["contracts", k])
+        if o["digest"] != c["digest"] and RSV.overlaps(o, c) and "contract-overlap" not in SKIP:
+            raise Refuse("contract_overlap", ["contracts", k])
+    return c
+
+
+def the_runs(c, runs):
+    """§8.2 step 4, as revenue-share §8.2 step 4."""
+    out = []
+    for k, o in enumerate(runs):
+        try:
+            r = RSV.read_run(o)
+        except RSV.NoRead:
+            raise Refuse("malformed", ["run", k])
+        if "run-verify" not in SKIP and not memo(_RUNS, o, lambda: RSV.run_verifies(r)):
+            raise Refuse("run_invalid", ["run", k])
+        if "run-foreign" not in SKIP and (r["channel_id"].encode() != c["channel"] or r["signer_pubkey"] != c["channel_signer"]):
+            raise Refuse("run_foreign", ["run", k])
+        if "run-overlap" not in SKIP and any(r["window_start_ms"] < x["window_end_ms"] and x["window_start_ms"] < r["window_end_ms"]
+                                             for x in out):
+            raise Refuse("run_overlap", ["run", k])
+        out.append(r)
+    return out
+
+
+def room_reads(v):
+    """§8.1: a room's object."""
+    if not isinstance(v, dict) or set(v) != {"descriptor", "grants", "key_log", "chains", "policy"}:
+        return False
+    if lowhex(v["descriptor"]) is None or lowhex(v["policy"]) is None:
+        return False
+    if not isinstance(v["grants"], list) or any(lowhex(g) is None for g in v["grants"]):
+        return False
+    if v["key_log"] is not None and not isinstance(v["key_log"], str):
+        return False
+    return isinstance(v["chains"], list) and all(isinstance(c, list) and all(lowhex(e) is not None for e in c) for c in v["chains"])
+
+
+def room_outcome(v):
+    """live-ads §9.2 steps 1 to 3 over a room with no receipts: live_ads_verify.py's outcome."""
+    holder = {"creatives": [], "issuers": []}
+    APV.held(holder)
+    lv = dict(v, pt0_ms=0, receipts=[], pods=[], claims=[], creatives=[], issuers=[], name="room")
+    return LAV.ads(lv, judge=lambda vv, d, p: APV.Judge(holder, vv, p))[0]
+
+
+def the_rooms(c, rooms):
+    """§8.2 step 5: each verified as live-ads §9.2 steps 1 to 3 verify one, with no receipts."""
+    out = []
+    for k, v in enumerate(rooms):
+        at = ["room", k]
+        if not room_reads(v):
+            raise Refuse("malformed", at)
+        got = memo(_ROOMS, v, lambda: room_outcome(v))
+        if got["outcome"] == "gap":
+            raise Refuse("delivery_gap", at)
+        if got["outcome"] != "accept":
+            raise Refuse(got["reason"], at + got["at"])
+        room_id = bytes.fromhex(got["room"])
+        if (ROOM_CARRIER, room_id) not in c["carriers"] and "room-foreign" not in SKIP:
+            raise Refuse("room_foreign", at)
+        if any(x["id"] == room_id for x in out) and "room-repeated" not in SKIP:
+            raise Refuse("room_repeated", at)
+        policy = LAV.read_policy(bytes.fromhex(v["policy"]))
+        events = {}
+        for chain in v["chains"]:
+            for h in chain:
+                ev = LEV.read_record(bytes.fromhex(h))
+                events[ev["digest"]] = ev
+        out.append({"id": room_id, "t0": LRV.read_descriptor(bytes.fromhex(v["descriptor"]))["t0"], "slots": policy["slots"],
+                    "policy": sha(policy["body"]), "breaks": got["breaks"], "events": events})
+    return out
+
+
+# ---------------------------------------------------------------- §4, §6 breaks
+
+def share_of(c, party, split):
+    return next((p for k, p in RSV.parties(c, split) if k == party), None)
+
+
+def attribute(c, run, rid, e, at):
+    """§6: an entry's asset by the rule, and its split; the between split for none."""
+    asset = RSV.asset_of(run["schedule"], e, c["rule"])
+    split = c["between"]
+    if asset is not None:
+        split = RSV.split_of(c, asset.encode())
+        if split is None:
+            if "unmapped" not in SKIP:
+                raise Refuse("asset_unmapped", at)
+            split = c["between"]
+    return rid, e, asset, split
+
+
+def place(runs, t):
+    """§6: the run whose window holds t, and its entry whose span does."""
+    for k, r in enumerate(runs):
+        if r["window_start_ms"] * 1000 <= t < r["window_end_ms"] * 1000:
+            for e, x in enumerate(r["schedule"]):
+                if x["start_ms"] * 1000 <= t < (x["start_ms"] + x["duration_ms"]) * 1000:
+                    return k, e
+            return None
+    return None
+
+
+def the_breaks(c, start, end, runs, ids, rooms):
+    """§8.2 steps 6 and 7."""
+    out, starts = [], []
+    for k, room in enumerate(rooms):
+        mine = []
+        for i, b in enumerate(room["breaks"]):
+            at = ["room", k, "break", i]
+            s = room["t0"] + b["t"]
+            if s > U64:
+                continue
+            starts.append(s)
+            if not (start <= s < end) and "period" not in SKIP:
+                continue
+            cue = LEV.read_payload(0x02, room["events"][bytes.fromhex(b["digest"])]["payload"], 65535)
+            st = None
+            if cue["form"] == 1:
+                try:
+                    st = read_section(cue["scte"])
+                except Bad:
+                    if "section-read" not in SKIP:
+                        raise Refuse("cue_section_invalid", at)
+                if st is not None and not agrees(st, cue) and "section-agree" not in SKIP:
+                    raise Refuse("cue_section_mismatch", at)
+            duration = b["duration_ms"] if b["duration_ms"] is not None else b["avail_ms"]
+            if "break-overlap" not in SKIP and any(o["start"] < s + duration * 1000 and s < o["start"] + o["duration_ms"] * 1000 for o in out):
+                raise Refuse("break_overlap", at)
+            where = place(runs, s)
+            if where is None:
+                if "window" in SKIP:
+                    continue
+                raise Refuse("outside_window", at)
+            rid, e, asset, split = attribute(c, runs[where[0]], ids[where[0]], where[1], at)
+            if st is not None and st["slots"] is not None and "slots-section" not in SKIP:
+                slots, source, pol = st["slots"], "section", None
+            else:
+                slots, source, pol = room["slots"], "policy", room["policy"]
+            cited = {(CUE_KIND, bytes.fromhex(b["digest"])), (RUN_KIND, rid)}
+            if b["closed_by"] is not None:
+                cited.add((CUE_KIND, bytes.fromhex(b["closed_by"])))
+            if pol is not None:
+                cited.add((POLICY_KIND, pol))
+            mine.append({"class": CUED, "room": k, "index": i, "taken": None, "cue": b["digest"], "start": s, "duration_ms": duration,
+                         "open": b["type"] == "out" and b["closed_by"] is None, "slots": slots, "slots_from": source,
+                         "section": None if st is None else {"command": command_name(st["command"]), "id": st["id"],
+                                                              "duration": st["duration"], "slots": st["slots"]},
+                         "run": rid, "entry": e, "asset": asset, "split": split, "cited": cited})
+        out += mine
+    seen = set()
+    for k in sorted(range(len(runs)), key=lambda j: runs[j]["window_start_ms"]):
+        r = runs[k]
+        for e in r["aired"]:
+            x = r["schedule"][e]
+            if x["kind"] != "ad":
+                continue
+            key = (x["asset_id"], x["start_ms"], x["duration_ms"])
+            if key in seen and "dedupe" not in SKIP:
+                continue
+            seen.add(key)
+            s, z = x["start_ms"] * 1000, (x["start_ms"] + x["duration_ms"]) * 1000
+            if any(s <= t < z for t in starts) and "cued-test" not in SKIP:
+                continue
+            if not (start <= s < end) and "period" not in SKIP:
+                continue
+            rid, e2, asset, split = attribute(c, r, ids[k], e, ["run", k, "entry", e])
+            out.append({"class": SCHEDULED, "room": None, "index": None, "taken": {"run": k, "entry": e}, "cue": None, "start": s,
+                        "duration_ms": x["duration_ms"], "open": False, "slots": None, "slots_from": None, "section": None,
+                        "run": rid, "entry": e2, "asset": asset, "split": split, "cited": {(RUN_KIND, rid)}})
+    return out
+
+
+# ---------------------------------------------------------------- §7 the report
+
+def cites_digest(cited):
+    return sha(CITES_DOMAIN, *[bytes([k]) + i for k, i in sorted(cited)])
+
+
+def read_report(b):
+    """§7.5, or Refuse at `report`."""
+    at = ["report"]
+    bad = RSV.head(b, REPORT_MAGIC)
+    if bad:
+        raise Refuse(bad, at)
+    r = RSV.R(b, 5)
+    try:
+        rep = {"issuer": r.take(32), "contract": r.take(32), "party": r.take(32), "start": r.u(8), "end": r.u(8)}
+        rep["rooms"] = [r.take(32) for _ in range(r.u(2))]
+        rep["runs"] = [r.take(32) for _ in range(r.u(2))]
+        rep["lines"] = []
+        for _ in range(r.u(2)):
+            rep["lines"].append({"split": r.u(2), "class": r.u(1), "breaks": r.u(8), "break_ms": r.u(8), "slots": r.u(8),
+                                 "unslotted": r.u(8), "ppm": r.u(4), "cited": r.u(4), "cites": r.take(32)})
+        rep["totals"] = (r.u(8), r.u(8), r.u(8))
+        rep["sig"] = r.take(64)
+    except ValueError:
+        raise Refuse("truncated", at)
+    if r.p != len(b):
+        raise Refuse("malformed", at)
+    keys = [(x["split"], x["class"]) for x in rep["lines"]]
+    rules = (rep["start"] < rep["end"] and rep["issuer"] != ZERO and rep["party"] != ZERO and RSV.ascending(rep["rooms"])
+             and RSV.ascending(rep["runs"]) and RSV.ascending(keys)
+             and all(x["class"] in (1, 2) and x["breaks"] > 0 and x["cited"] > 0 and x["unslotted"] <= x["breaks"]
+                     and 1 <= x["ppm"] <= WHOLE for x in rep["lines"]))
+    if not rules and "report-rules" not in SKIP:
+        raise Refuse("opportunity_report_invalid", at)
+    rep["body"] = b[:-64]
+    rep["digest"] = sha(rep["body"])
+    return rep
+
+
+def groups_of(breaks):
+    g = {}
+    for b in breaks:
+        x = g.setdefault((b["split"], b["class"]), {"breaks": 0, "break_ms": 0, "slots": 0, "unslotted": 0, "cited": set()})
+        x["breaks"] += 1
+        x["break_ms"] += b["duration_ms"]
+        if b["slots"] is None:
+            x["unslotted"] += 1
+        else:
+            x["slots"] += b["slots"]
+        x["cited"] |= b["cited"]
+    return g
+
+
+def lines_of(c, party, breaks):
+    """§7.2, §7.3: the party's lines and totals, or None for a figure past its field."""
+    out = []
+    for (split, cls), g in sorted(groups_of(breaks).items()):
+        ppm = share_of(c, party, split)
+        if ppm is None:
+            continue
+        out.append({"split": split, "class": cls, "breaks": g["breaks"], "break_ms": g["break_ms"], "slots": g["slots"],
+                    "unslotted": g["unslotted"], "ppm": ppm, "cited": len(g["cited"]), "cites": cites_digest(g["cited"]),
+                    "cited_records": sorted(g["cited"])})
+    totals = (sum(x["breaks"] for x in out), sum(x["break_ms"] for x in out), sum(x["slots"] for x in out))
+    if any(x[f] > U64 for x in out for f in ("break_ms", "slots")) or any(t > U64 for t in totals):
+        return None, None
+    return out, totals
+
+
+LINE_FIELDS = ("split", "class", "breaks", "break_ms", "slots", "unslotted", "ppm", "cited", "cites")
+
+
+def verify_report(doc):
+    """§8.2: (outcome, held) where held is what a check reads of an accepted report."""
+    try:
+        if not isinstance(doc, dict) or set(doc) != {"contract", "contracts", "report", "runs", "rooms"}:
+            raise Refuse("malformed", [])
+        if not all(isinstance(doc[k], list) for k in ("contracts", "runs", "rooms")):
+            raise Refuse("malformed", [])
+        if lowhex(doc["contract"]) is None or lowhex(doc["report"]) is None or any(lowhex(h) is None for h in doc["contracts"]):
+            raise Refuse("malformed", [])
+        c = the_contract(doc)                                                                  # steps 1, 2
+        rep = read_report(bytes.fromhex(doc["report"]))                                       # step 3
+        if "binding" not in SKIP and (rep["contract"] != c["digest"] or (rep["party"] != c["operator"] and rep["party"] not in c["owners"])):
+            raise Refuse("contract_mismatch", ["report"])
+        if "contract-period" not in SKIP and not (c["start"] <= rep["start"] and rep["end"] <= c["end"]):
+            raise Refuse("outside_contract", ["report"])
+        if "report-signature" not in SKIP:
+            bad = ed_verify(rep["issuer"], REPORT_DOMAIN + rep["body"], rep["sig"])
+            if bad:
+                raise Refuse(bad, ["report"])
+        runs = the_runs(c, doc["runs"])                                                        # step 4
+        ids = [RSV.run_identity(r) for r in runs]
+        rooms = the_rooms(c, doc["rooms"])                                                     # step 5
+        breaks = the_breaks(c, rep["start"], rep["end"], runs, ids, rooms)                    # steps 6, 7
+        groups = groups_of(breaks)                                                             # step 8
+        for x in rep["lines"]:
+            g = groups.get((x["split"], x["class"]))
+            holds = x["split"] < len(c["splits"]) and share_of(c, rep["party"], x["split"]) is not None
+            if "unsourced" not in SKIP and (g is None or not holds or x["breaks"] > g["breaks"]):
+                raise Refuse("line_unsourced", ["report"])
+        lines, totals = lines_of(c, rep["party"], breaks)
+        if lines is None:
+            raise Refuse("opportunity_report_mismatch", ["report"])
+        for x in rep["lines"]:
+            mine = [y for y in lines if (y["split"], y["class"]) == (x["split"], x["class"])]
+            if mine and "citations" not in SKIP and (x["cited"] != mine[0]["cited"] or x["cites"] != mine[0]["cites"]):
+                raise Refuse("citation_mismatch", ["report"])
+        same = (rep["rooms"] == sorted(r["id"] for r in rooms) and rep["runs"] == sorted(ids)
+                and [{k: x[k] for k in LINE_FIELDS} for x in rep["lines"]] == [{k: y[k] for k in LINE_FIELDS} for y in lines]
+                and rep["totals"] == totals)
+        if not same and "mismatch" not in SKIP:
+            raise Refuse("opportunity_report_mismatch", ["report"])
+    except Refuse as e:
+        return {"outcome": "refuse", "reason": e.reason, "at": e.at}, None
+    counted = [b for b in breaks if share_of(c, rep["party"], b["split"]) is not None]
+    return accepted_report(c, rep, breaks, lines), {"contract": c, "report": rep, "counted": counted}
+
+
+def accepted_report(c, rep, breaks, lines):
+    """§8.3."""
+    return {
+        "outcome": "accept",
+        "report": rep["digest"].hex(),
+        "contract": rep["contract"].hex(),
+        "issuer": rep["issuer"].hex(),
+        "party": rep["party"].hex(),
+        "role": "operator" if rep["party"] == c["operator"] else "owner",
+        "start": rep["start"],
+        "end": rep["end"],
+        "rooms": [d.hex() for d in rep["rooms"]],
+        "runs": [d.hex() for d in rep["runs"]],
+        "breaks": [{"class": CLASS_NAMES[b["class"]], "room": b["room"], "index": b["index"], "taken": b["taken"], "cue": b["cue"],
+                    "start": b["start"], "duration_ms": b["duration_ms"], "open": b["open"], "slots": b["slots"],
+                    "slots_from": b["slots_from"], "section": b["section"], "run": b["run"].hex(), "entry": b["entry"],
+                    "asset": b["asset"], "split": b["split"], "cites": [[k, d.hex()] for k, d in sorted(b["cited"])]} for b in breaks],
+        "lines": [{"split": y["split"], "class": CLASS_NAMES[y["class"]], "breaks": y["breaks"], "break_ms": y["break_ms"],
+                   "slots": y["slots"], "unslotted": y["unslotted"], "ppm": y["ppm"],
+                   "cites": [[k, d.hex()] for k, d in y["cited_records"]]} for y in lines],
+        "totals": {"breaks": rep["totals"][0], "break_ms": rep["totals"][1], "slots": rep["totals"][2]},
+    }
+
+
+# ---------------------------------------------------------------- §9 the reported statement
+
+DATE = re.compile(r"(\d{4})-(\d{2})-(\d{2})")
+
+
+def day_start(s):
+    """§2: the start of a day `YYYY-MM-DD` from 1970 to 9999, in microseconds, or None."""
+    m = DATE.fullmatch(s) if isinstance(s, str) and s.isascii() else None
+    if m is None:
+        return None
+    y, mo, d = (int(x) for x in m.groups())
+    leap = (y % 4 == 0 and y % 100 != 0) or y % 400 == 0
+    days = [31, 29 if leap else 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+    if not (1970 <= y <= 9999 and 1 <= mo <= 12 and 1 <= d <= days[mo - 1]):
+        return None
+    ordinal = sum(366 if (x % 4 == 0 and x % 100 != 0) or x % 400 == 0 else 365 for x in range(1970, y)) + sum(days[:mo - 1]) + d - 1
+    return ordinal * DAY_US
+
+
+def an_int(v):
+    return isinstance(v, int) and not isinstance(v, bool) and 0 <= v <= U64
+
+
+def utf8(s):
+    try:
+        return s.encode("utf-8")
+    except UnicodeEncodeError:
+        return None
+
+
+def from_json(text):
+    try:
+        o = json.loads(text)
+    except ValueError:
+        return None
+    need = {"channel", "start", "end", "currency", "basis", "impressions", "revenue"}
+    if not isinstance(o, dict) or not need <= set(o) or not set(o) <= need | {"days", "programmes"}:
+        return None
+    if not all(isinstance(o[k], str) for k in ("channel", "currency", "basis")) or not all(an_int(o[k]) for k in ("start", "end", "impressions", "revenue")):
+        return None
+    if o["basis"] not in BASES:
+        return None
+    r = {"channel": utf8(o["channel"]), "start": o["start"], "end": o["end"], "currency": utf8(o["currency"]), "basis": BASES[o["basis"]],
+         "impressions": o["impressions"], "revenue": o["revenue"], "days": [], "programmes": []}
+    for name, key in (("days", "day"), ("programmes", "asset")):
+        items = o.get(name, [])
+        if not isinstance(items, list):
+            return None
+        for x in items:
+            if not isinstance(x, dict) or set(x) != {key, "impressions", "revenue"} or not isinstance(x[key], str):
+                return None
+            if not an_int(x["impressions"]) or not an_int(x["revenue"]):
+                return None
+            if name == "days":
+                start = day_start(x["day"])
+                if start is None:
+                    return None
+                r["days"].append({"day": x["day"], "start": start, "impressions": x["impressions"], "revenue": x["revenue"]})
+            else:
+                r["programmes"].append({"asset": utf8(x["asset"]), "impressions": x["impressions"], "revenue": x["revenue"]})
+    if r["channel"] is None or r["currency"] is None or any(p["asset"] is None for p in r["programmes"]):
+        return None
+    return r
+
+
+def csv_records(text):
+    """RFC 4180 records, each ended by CRLF or LF, the last line break optional; None when not."""
+    b, n, p, out = text, len(text), 0, []
+    if n == 0:
+        return None
+    while True:
+        rec = []
+        while True:
+            f = []
+            if p < n and b[p] == '"':
+                p += 1
+                while True:
+                    if p >= n:
+                        return None
+                    if b[p] == '"':
+                        if p + 1 < n and b[p + 1] == '"':
+                            f.append('"')
+                            p += 2
+                        else:
+                            p += 1
+                            break
+                    else:
+                        f.append(b[p])
+                        p += 1
+            else:
+                while p < n and b[p] not in ",\r\n":
+                    if b[p] == '"':
+                        return None
+                    f.append(b[p])
+                    p += 1
+            rec.append("".join(f))
+            if p < n and b[p] == ",":
+                p += 1
+                continue
+            break
+        out.append(rec)
+        if p == n:
+            return out
+        if b[p] == "\r" and p + 1 < n and b[p + 1] == "\n":
+            p += 2
+        elif b[p] == "\n":
+            p += 1
+        else:
+            return None
+        if p == n:
+            return out
+
+
+def csv_int(s):
+    if not re.fullmatch(r"0|[1-9][0-9]*", s or "", re.ASCII):
+        return None
+    v = int(s)
+    return v if v <= U64 else None
+
+
+def from_csv(text):
+    recs = csv_records(text)
+    if recs is None or any(len(r) != 4 for r in recs) or not recs or recs[0] != ["scope", "key", "impressions", "revenue"]:
+        return None
+    rows = recs[1:]
+    meta = {}
+    for name in ("channel", "start", "end", "currency", "basis"):
+        if not rows or rows[0][0] != name or rows[0][2] != "" or rows[0][3] != "":
+            return None
+        meta[name] = rows[0][1]
+        rows = rows[1:]
+    if not rows or rows[0][0] != "period" or rows[0][1] != "":
+        return None
+    period, rows = rows[0], rows[1:]
+    start, end, imps, rev = csv_int(meta["start"]), csv_int(meta["end"]), csv_int(period[2]), csv_int(period[3])
+    if None in (start, end, imps, rev) or meta["basis"] not in BASES:
+        return None
+    r = {"channel": meta["channel"].encode(), "start": start, "end": end, "currency": meta["currency"].encode(),
+         "basis": BASES[meta["basis"]], "impressions": imps, "revenue": rev, "days": [], "programmes": []}
+    in_programmes = False
+    for row in rows:
+        i, v = csv_int(row[2]), csv_int(row[3])
+        if i is None or v is None:
+            return None
+        if row[0] == "day" and not in_programmes:
+            ds = day_start(row[1])
+            if ds is None:
+                return None
+            r["days"].append({"day": row[1], "start": ds, "impressions": i, "revenue": v})
+        elif row[0] == "programme":
+            in_programmes = True
+            r["programmes"].append({"asset": row[1].encode(), "impressions": i, "revenue": v})
+        else:
+            return None
+    return r
+
+
+def read_reported(form, text):
+    """§9: the reported statement of a form, held to §9.3's rules, or None (reported_invalid)."""
+    r = from_json(text) if form == 1 else from_csv(text)
+    if r is None:
+        return None
+    rules = (1 <= len(r["channel"]) <= 1024 and len(r["currency"]) == 3 and all(0x41 <= x <= 0x5A for x in r["currency"])
+             and r["start"] < r["end"]
+             and all(r["start"] <= d["start"] and d["start"] + DAY_US <= r["end"] for d in r["days"])
+             and all(a["start"] < b["start"] for a, b in zip(r["days"], r["days"][1:]))
+             and all(1 <= len(p["asset"]) <= 1024 for p in r["programmes"])
+             and all(a["asset"] < b["asset"] for a, b in zip(r["programmes"], r["programmes"][1:])))
+    if not rules and "reported-rules" not in SKIP:
+        return None
+    return r
+
+
+# ---------------------------------------------------------------- §10 the check
+
+def read_check(b):
+    """§10.6, or Refuse at `check`."""
+    at = ["check"]
+    bad = RSV.head(b, CHECK_MAGIC)
+    if bad:
+        raise Refuse(bad, at)
+    r = RSV.R(b, 5)
+    try:
+        c = {"issuer": r.take(32), "report": r.take(32), "reported": r.take(32), "form": r.u(1), "statement": r.take(32),
+             "floor": r.u(4), "ceiling": r.u(4), "lines": []}
+        for _ in range(r.u(2)):
+            x = {"scope": r.u(1), "key": r.text()}
+            for f in ("breaks", "break_ms", "slots", "unslotted", "impressions", "revenue", "fill_ppm", "revenue_per_slot"):
+                x[f] = r.u(8)
+            signed = r.u(1)
+            if signed not in (0, 1):
+                raise Refuse("statement_check_invalid", at)
+            x["signed"] = (r.u(8), r.u(8)) if signed else None
+            x["flags"] = r.u(1)
+            c["lines"].append(x)
+        c["sig"] = r.take(64)
+    except ValueError:
+        raise Refuse("truncated", at)
+    if r.p != len(b):
+        raise Refuse("malformed", at)
+
+    def key_ok(x):
+        if x["scope"] == PERIOD:
+            return x["key"] == b""
+        try:
+            k = x["key"].decode("utf-8")
+        except UnicodeDecodeError:
+            return False
+        if x["scope"] == DAY:
+            return day_start(k) is not None
+        return x["scope"] == PROGRAMME and 1 <= len(x["key"]) <= 1024
+
+    ls = c["lines"]
+    rules = (c["issuer"] != ZERO and c["form"] in (1, 2) and c["floor"] <= WHOLE and c["ceiling"] >= WHOLE
+             and bool(ls) and ls[0]["scope"] == PERIOD and sum(1 for x in ls if x["scope"] == PERIOD) == 1
+             and RSV.ascending([(x["scope"], x["key"]) for x in ls])
+             and all(key_ok(x) and (x["signed"] is None or x["scope"] == PERIOD) and x["flags"] < 0x80 for x in ls))
+    if not rules and "check-rules" not in SKIP:
+        raise Refuse("statement_check_invalid", at)
+    c["body"] = b[:-64]
+    c["digest"] = sha(c["body"])
+    return c
+
+
+def ratio(a, m, b):
+    return 0 if b == 0 else min(a * m // b, U64)
+
+
+def tally(bs):
+    return (len(bs), min(sum(b["duration_ms"] for b in bs), U64), min(sum(b["slots"] for b in bs if b["slots"] is not None), U64),
+            sum(1 for b in bs if b["slots"] is None))
+
+
+def check_lines(counted, reported, signed, floor, ceiling):
+    """§10.2 to §10.4."""
+    def line(scope, key, t, imps, rev, sig):
+        return {"scope": scope, "key": key, "breaks": t[0], "break_ms": t[1], "slots": t[2], "unslotted": t[3], "impressions": imps,
+                "revenue": rev, "fill_ppm": ratio(imps, WHOLE, t[2]), "revenue_per_slot": ratio(rev, 1, t[2]), "signed": sig, "flags": 0}
+    out = [line(PERIOD, b"", tally(counted), reported["impressions"], reported["revenue"], signed)]
+    for d in reported["days"]:
+        out.append(line(DAY, d["day"].encode(), tally([b for b in counted if d["start"] <= b["start"] < d["start"] + DAY_US]),
+                        d["impressions"], d["revenue"], None))
+    for p in reported["programmes"]:
+        out.append(line(PROGRAMME, p["asset"], tally([b for b in counted if b["asset"] is not None and b["asset"].encode() == p["asset"]]),
+                        p["impressions"], p["revenue"], None))
+    rate, period_slots = out[0]["fill_ppm"], out[0]["slots"]
+    for x in out:
+        f = 0
+        if x["impressions"] > 0 and x["breaks"] == 0 and "flag-unproved" not in SKIP:
+            f |= 1
+        if x["scope"] != PERIOD and x["slots"] > 0 and period_slots > 0 and "flag-bounds" not in SKIP:
+            if x["fill_ppm"] * WHOLE > rate * ceiling:
+                f |= 2
+            if x["fill_ppm"] * WHOLE < rate * floor:
+                f |= 4
+        if x["signed"] is not None and "flag-signed" not in SKIP:
+            si, sr = x["signed"]
+            f |= (8 if x["impressions"] > si else 0) | (16 if x["impressions"] < si else 0)
+            f |= (32 if x["revenue"] > sr else 0) | (64 if x["revenue"] < sr else 0)
+        x["flags"] = f
+    return out
+
+
+CHECK_LINE_FIELDS = ("scope", "key", "breaks", "break_ms", "slots", "unslotted", "impressions", "revenue", "fill_ppm", "revenue_per_slot",
+                     "signed", "flags")
+
+
+def verify_check(doc):
+    """§11.2."""
+    try:
+        if not isinstance(doc, dict) or set(doc) != {"report", "reported", "statement", "check"}:
+            raise Refuse("malformed", [])
+        rp = doc["reported"]
+        if not isinstance(rp, dict) or set(rp) != {"form", "text"} or rp["form"] not in FORMS or not isinstance(rp["text"], str):
+            raise Refuse("malformed", [])
+        cb = lowhex(doc["check"])
+        if cb is None or not (doc["statement"] is None or isinstance(doc["statement"], dict)):
+            raise Refuse("malformed", [])
+        got, held = verify_report(doc["report"])                                             # step 1
+        if got["outcome"] != "accept":
+            raise Refuse(got["reason"], ["report"] + got["at"])
+        c, rep = held["contract"], held["report"]
+        form = FORMS[rp["form"]]
+        reported = read_reported(form, rp["text"])                                           # step 2
+        if reported is None:
+            raise Refuse("reported_invalid", ["reported"])
+        if "reported-foreign" not in SKIP and (reported["channel"] != c["channel"] or reported["currency"] != c["currency"]
+                                               or (reported["start"], reported["end"]) != (rep["start"], rep["end"])):
+            raise Refuse("reported_foreign", ["reported"])
+        statement = None
+        if doc["statement"] is not None:                                                     # step 3
+            sg = memo(_STATEMENTS, doc["statement"], lambda: RSV.verify(doc["statement"]))
+            if sg["outcome"] != "accept":
+                raise Refuse(sg["reason"], ["statement"] + sg["at"])
+            statement = RSV.read_statement(bytes.fromhex(doc["statement"]["statement"]))
+            if "statement-foreign" not in SKIP and (statement["contract"] != rep["contract"] or statement["party"] != rep["party"]
+                                                    or (statement["start"], statement["end"]) != (rep["start"], rep["end"])):
+                raise Refuse("statement_foreign", ["statement"])
+        ch = read_check(cb)                                                                  # step 4
+        if "check-signature" not in SKIP:
+            bad = ed_verify(ch["issuer"], CHECK_DOMAIN + ch["body"], ch["sig"])
+            if bad:
+                raise Refuse(bad, ["check"])
+        signed = None
+        if statement is not None:
+            imps = min(sum(x["impressions"] for x in statement["lines"]), U64)
+            rev = min(sum(x["revenue"] for x in statement["lines"]), U64) if reported["basis"] == 1 else statement["total"]
+            signed = (imps, rev)
+        lines = check_lines(held["counted"], reported, signed, ch["floor"], ch["ceiling"])
+        same = (ch["report"] == rep["digest"] and ch["reported"] == sha(rp["text"].encode()) and ch["form"] == form
+                and ch["statement"] == (ZERO if statement is None else statement["digest"])
+                and [{k: x[k] for k in CHECK_LINE_FIELDS} for x in ch["lines"]] == [{k: y[k] for k in CHECK_LINE_FIELDS} for y in lines])
+        if not same and "check-mismatch" not in SKIP:
+            raise Refuse("statement_check_mismatch", ["check"])
+    except Refuse as e:
+        return {"outcome": "refuse", "reason": e.reason, "at": e.at}
+    return {
+        "outcome": "accept",
+        "check": ch["digest"].hex(),
+        "issuer": ch["issuer"].hex(),
+        "report": ch["report"].hex(),
+        "party": rep["party"].hex(),
+        "start": rep["start"],
+        "end": rep["end"],
+        "reported": ch["reported"].hex(),
+        "form": FORM_NAMES[ch["form"]],
+        "basis": BASIS_NAMES[reported["basis"]],
+        "statement": None if statement is None else statement["digest"].hex(),
+        "floor_ppm": ch["floor"],
+        "ceiling_ppm": ch["ceiling"],
+        "lines": [{"scope": SCOPE_NAMES[x["scope"]], "key": x["key"].decode("utf-8"), "breaks": x["breaks"], "break_ms": x["break_ms"],
+                   "slots": x["slots"], "unslotted": x["unslotted"], "impressions": x["impressions"], "revenue": x["revenue"],
+                   "fill_ppm": x["fill_ppm"], "revenue_per_slot": x["revenue_per_slot"],
+                   "signed": None if x["signed"] is None else {"impressions": x["signed"][0], "revenue": x["signed"][1]},
+                   "flags": [n for i, n in enumerate(FLAGS) if x["flags"] & (1 << i)]} for x in ch["lines"]],
+    }
+
+
+def verify(doc):
+    """A report's or a check's document: a check's holds `reported`."""
+    if isinstance(doc, dict) and "reported" in doc:
+        return verify_check(doc)
+    return verify_report(doc)[0]
+
+
+# ---------------------------------------------------------------- the corpus
+
+def document(doc, v):
+    """A vector as its verification document, its parts resolved by name."""
+    def report_doc(p):
+        return {"contract": doc["contracts"][p["contract"]], "contracts": [doc["contracts"][n] for n in p["contracts"]],
+                "report": p["report"], "runs": None if p["runs"] is None else [doc["runs"][n] for n in p["runs"]],
+                "rooms": [doc["rooms"][n] for n in p["rooms"]]}
+    if v["kind"] == "report":
+        return report_doc(v["report"])
+    s = v["statement"]
+    sd = None if s is None else {"contract": doc["contracts"][s["contract"]], "contracts": [], "statement": s["statement"],
+                                 "runs": [doc["runs"][n] for n in s["runs"]], "ledgers": [doc["ledgers"][n] for n in s["ledgers"]]}
+    return {"report": report_doc(v["report"]), "reported": doc["reported"][v["reported"]], "statement": sd, "check": v["check"]}
+
+
+def check(doc, quiet=False):
+    """The failures: every vector whose stated outcome is not the one this verifier reaches."""
+    fails = []
+    for v in doc.get("vectors", []):
+        try:
+            got = verify(document(doc, v))
+        except Exception as e:  # a crash on a mutated copy is a failure to verify it
+            got = {"outcome": "crash", "error": "%s: %s" % (type(e).__name__, e)}
+        ok = got == v.get("outcome")
+        if not quiet:
+            what = got["outcome"] + (" %s at %s" % (got["reason"], got["at"]) if got["outcome"] == "refuse" else "")
+            print(("PASS" if ok else "FAIL") + " %s: %s" % (v.get("name"), what))
+        if not ok:
+            fails.append(v.get("name"))
+    return fails
+
+
+def reasons_listed():
+    """§13's table, in order."""
+    text = open(EXTENSION, encoding="utf-8").read()
+    at = text.index("\n## 13. Reasons")
+    end = text.find("\n## ", at + 1)
+    return [m.group(1) for m in re.finditer(r"^\| `([a-z_]+)` \|", text[at:end], re.M)]
+
+
+def flip_hex(h, at):
+    b = bytearray(bytes.fromhex(h))
+    b[at % len(b)] ^= 0x01
+    return b.hex()
+
+
+def mutations(doc):
+    """Copies of the corpus, one defect each, that a verifier must reject."""
+    out = []
+    names = [v["name"] for v in doc["vectors"]]
+
+    def mutate(label, f):
+        m = copy.deepcopy(doc)
+        f(m)
+        out.append((label, m))
+
+    for k, v in enumerate(doc["vectors"]):
+        if v["outcome"]["outcome"] != "accept":
+            continue
+        if v["kind"] == "report":
+            for at in (6, 40, 100, 140, -90, -70, -1):
+                mutate("%s: report byte %d flipped" % (v["name"], at), lambda m, k=k, at=at: m["vectors"][k]["report"].update(
+                    report=flip_hex(m["vectors"][k]["report"]["report"], at)))
+            mutate("%s: its stated totals raised" % v["name"], lambda m, k=k: m["vectors"][k]["outcome"]["totals"].update(
+                breaks=m["vectors"][k]["outcome"]["totals"]["breaks"] + 1))
+            if v["outcome"]["breaks"]:
+                mutate("%s: its first break moved a second" % v["name"], lambda m, k=k: m["vectors"][k]["outcome"]["breaks"][0].update(
+                    start=m["vectors"][k]["outcome"]["breaks"][0]["start"] + 1_000_000))
+                mutate("%s: its first break's slots changed" % v["name"], lambda m, k=k: m["vectors"][k]["outcome"]["breaks"][0].update(
+                    slots=7))
+            if v["report"]["rooms"]:
+                mutate("%s: its last room dropped" % v["name"], lambda m, k=k: m["vectors"][k]["report"]["rooms"].pop())
+        else:
+            for at in (40, 104, 150, -80, -66, -1):
+                mutate("%s: check byte %d flipped" % (v["name"], at), lambda m, k=k, at=at: m["vectors"][k].update(
+                    check=flip_hex(m["vectors"][k]["check"], at)))
+            mutate("%s: a line's flags changed in its outcome" % v["name"], lambda m, k=k: m["vectors"][k]["outcome"]["lines"][-1].update(
+                flags=["above"]))
+            if v["statement"] is not None:
+                mutate("%s: its signed statement left out" % v["name"], lambda m, k=k: m["vectors"][k].update(statement=None))
+    for name, at in (("main", -1), ("main", 40), ("two_rooms", 60)):
+        mutate("the contract %s: byte %d flipped" % (name, at), lambda m, name=name, at=at: m["contracts"].update(
+            {name: flip_hex(doc["contracts"][name], at)}))
+    mutate("the run of the first hour: its signature flipped",
+           lambda m: m["runs"]["hour_1"].update(sig=flip_hex(doc["runs"]["hour_1"]["sig"], 3)))
+    mutate("the run of the second hour: its first programme renamed",
+           lambda m: m["runs"]["hour_2"]["schedule"][0].update(asset_id="a/ep-1"))
+    mutate("the main room: an event of its producer's flipped",
+           lambda m: m["rooms"]["main"]["chains"][1].__setitem__(5, flip_hex(doc["rooms"]["main"]["chains"][1][5], 130)))
+    mutate("the main room: its policy flipped", lambda m: m["rooms"]["main"].update(policy=flip_hex(doc["rooms"]["main"]["policy"], 70)))
+    mutate("owner B's reported statement: one impression more",
+           lambda m: m["reported"]["b_programmes"].update(text=doc["reported"]["b_programmes"]["text"].replace('"impressions":14', '"impressions":15')))
+    mutate("owner A's CSV: its line breaks made LF",
+           lambda m: m["reported"]["a_days"].update(text=doc["reported"]["a_days"]["text"].replace("\r\n", "\n")))
+    for k, v in enumerate(doc["vectors"]):
+        if v["outcome"]["outcome"] == "refuse":
+            mutate("%s: its stated reason changed" % v["name"], lambda m, k=k, v=v: m["vectors"][k]["outcome"].update(
+                reason="malformed" if v["outcome"]["reason"] != "malformed" else "truncated"))
+            break
+    assert len(names) == len(set(names)), "vector names are unique"
+    return out
+
+
+CHECKS = ["contract-overlap", "report-rules", "binding", "contract-period", "report-signature", "run-verify", "run-foreign", "run-overlap",
+          "room-foreign", "room-repeated", "period", "section-crc", "section-read", "section-agree", "break-overlap", "window", "unmapped",
+          "slots-section", "dedupe", "cued-test", "unsourced", "citations", "mismatch", "reported-rules", "reported-foreign",
+          "statement-foreign", "check-rules", "check-signature", "check-mismatch", "flag-unproved", "flag-bounds", "flag-signed"]
+
+
+def self_tests():
+    """The standard's sample (SCTE 35-1 §14.1, as cue-injection §5.7 holds it) reads as §5 reads it."""
+    sample = bytes.fromhex("fc3034000000000000fffff00506fe72bd0050001e021c435545494800008e7fcf0001a599b00808000000002ca0a18a3402009ac9d17e")
+    st = read_section(sample)
+    fails = []
+    if (st["command"], st["id"], st["duration"], st["slots"]) != (0x06, 0x4800008E, 307 * 90_000, None):
+        fails.append("the standard's sample does not state its opportunity")
+    damaged = bytearray(sample)
+    damaged[-1] ^= 1
+    try:
+        read_section(bytes(damaged))
+        fails.append("a section with a damaged CRC reads")
+    except Bad:
+        pass
+    print("%s the standard's SCTE 35 sample reads, and a damaged copy does not" % ("PASS" if not fails else "FAIL"))
+    return fails
+
+
+def main(corpus_dir):
+    doc = json.load(open(os.path.join(corpus_dir, "vectors.json"), encoding="utf-8"))
+    fails = self_tests()
+    fails += check(doc)
+    files = sorted(os.listdir(corpus_dir))
+    if files != ["README.md", "vectors.json"]:
+        fails.append("the corpus holds other files: %s" % files)
+    seen = {v["outcome"].get("reason") for v in doc["vectors"]}
+    listed = reasons_listed()
+    missing = [r for r in listed + REUSED if r not in seen]
+    if missing:
+        fails.append("no vector is refused %s" % missing)
+    print("%s every reason of §13 and every reused code refuses a vector (%d listed)" % ("PASS" if not missing else "FAIL", len(listed)))
+    # And no refusal is unaccounted for: each is §13's, a code §13 reuses, or a code a text it
+    # delegates to (revenue-share, live-ads) raises there.
+    delegated = set(RSV.reasons_listed()) | set(RSV.REUSED) | set(LAV.REASONS)
+    unexplained = sorted(r for r in seen if r is not None and r not in listed and r not in REUSED and r not in delegated)
+    if unexplained:
+        fails.append("refusals §13 does not account for: %s" % unexplained)
+    print("%s every refusal of the corpus is a reason of §13, a code it reuses, or one a text it delegates to raises" % (
+        "PASS" if not unexplained else "FAIL"))
+    muts = mutations(doc)
+    weak = [name for name, m in muts if not check(m, quiet=True)]
+    print("%s every mutated copy of the corpus fails (%d copies)" % ("PASS" if not weak else "FAIL", len(muts)))
+    fails += ["the mutated copy %r verifies" % w for w in weak]
+    undetected = []
+    for c in CHECKS:
+        SKIP.add(c)
+        try:
+            if not check(doc, quiet=True):
+                undetected.append(c)
+        finally:
+            SKIP.discard(c)
+    print("%s the corpus catches the verifier with each of its checks dropped (%d checks)" % ("PASS" if not undetected else "FAIL", len(CHECKS)))
+    fails += ["dropping the check %r goes unnoticed" % c for c in undetected]
+    for f in fails:
+        print("FAIL", f)
+    return 1 if fails else 0
+
+
+def check_document(path):
+    doc = json.load(open(path, encoding="utf-8"))
+    got = verify(doc)
+    print(json.dumps(got, indent=1))
+    return 0 if got["outcome"] == "accept" else 1
+
+
+if __name__ == "__main__":
+    if len(sys.argv) == 3 and sys.argv[1] == "--document":
+        sys.exit(check_document(sys.argv[2]))
+    if len(sys.argv) != 2:
+        print("usage: opportunity_report_verify.py <live-conformance/opportunity> | --document FILE", file=sys.stderr)
+        sys.exit(2)
+    sys.exit(main(sys.argv[1]))
diff --git a/wai/registry/capabilities.json b/wai/registry/capabilities.json
index ace01a158..149f97aa6 100644
--- a/wai/registry/capabilities.json
+++ b/wai/registry/capabilities.json
@@ -404,6 +404,20 @@
       "edition": null,
       "registered": "2026-10-25"
     },
+    {
+      "capability": "wai.delivery.opportunity",
+      "kind": "record",
+      "status": "registered",
+      "media": null,
+      "role": null,
+      "tier": null,
+      "licence": null,
+      "replicate": null,
+      "sets": [],
+      "spec_section": "§5 Interactive, temporal & computed content",
+      "edition": null,
+      "registered": "2026-10-29"
+    },
     {
       "capability": "wai.delivery.revenue_share",
       "kind": "record",
@@ -2765,6 +2779,13 @@
       "section": "§10.2",
       "status": "defined"
     },
+    {
+      "name": "WCK1",
+      "kind": "magic",
+      "document": "extensions/opportunity-report.md",
+      "section": "§10.1",
+      "status": "defined"
+    },
     {
       "name": "WCL1",
       "kind": "magic",
@@ -2989,6 +3010,13 @@
       "section": "§4.2",
       "status": "defined"
     },
+    {
+      "name": "WOR1",
+      "kind": "magic",
+      "document": "extensions/opportunity-report.md",
+      "section": "§7.1",
+      "status": "defined"
+    },
     {
       "name": "WPA1",
       "kind": "magic",
diff --git a/wai/vocab/v2.ttl b/wai/vocab/v2.ttl
index d053b3a77..734786dc6 100644
--- a/wai/vocab/v2.ttl
+++ b/wai/vocab/v2.ttl
@@ -373,6 +373,13 @@ wai:wai.delivery.ledger a wai:Capability ;
     wai:specSection "§5 Interactive, temporal & computed content" ;
     wai:registeredOn "2026-10-25"^^xsd:date .
 
+wai:wai.delivery.opportunity a wai:Capability ;
+    rdfs:label "wai.delivery.opportunity" ;
+    wai:kind wai:kind-record ;
+    wai:status wai:status-registered ;
+    wai:specSection "§5 Interactive, temporal & computed content" ;
+    wai:registeredOn "2026-10-29"^^xsd:date .
+
 wai:wai.delivery.revenue_share a wai:Capability ;
     rdfs:label "wai.delivery.revenue_share" ;
     wai:kind wai:kind-record ;
diff --git a/wai/wai-rs/Cargo.toml b/wai/wai-rs/Cargo.toml
index d4400e981..a4db01b41 100644
--- a/wai/wai-rs/Cargo.toml
+++ b/wai/wai-rs/Cargo.toml
@@ -513,6 +513,14 @@ receipt_ledger = ["live_metering", "settlement", "live_ads", "video_package", "s
 # revenue divided by the largest-remainder rule. SHA-256, Ed25519 and the sources' own readers; no
 # new dependency.
 revenue_share = ["receipt_ledger", "video_channel"]
+# Opportunity report (extensions/opportunity-report): `wai.delivery.opportunity` — the ad breaks a
+# channel's own signed records prove, per owner and period (WOR1): the cues of a room a share
+# contract names (live_ads, the SCTE 35 sections they carry read for their slots) and the ad
+# entries of the channel's program-as-run, each attributed to the programme on air; and the check
+# (WCK1) of a platform's reported figures, in a documented JSON or CSV form, against the report and
+# the operator's signed revenue-share statement. SHA-256, Ed25519 and the sources' own readers; no
+# new dependency.
+opportunity_report = ["revenue_share"]
 # Stream audit (extensions/stream-audit): `wai.delivery.audit` — what a content owner gathers from the
 # players of a stream another service delivers over HTTP: settlement acknowledgements of every object
 # by plain SHA-256 (settlement §14), one chain per origin, under a fresh session key; presentation
@@ -1313,6 +1321,11 @@ name = "wai_revenue_share_vectors"
 path = "src/bin/wai_revenue_share_vectors.rs"
 required-features = ["revenue_share"]
 
+[[bin]]
+name = "wai_opportunity_vectors"
+path = "src/bin/wai_opportunity_vectors.rs"
+required-features = ["opportunity_report"]
+
 [[bin]]
 name = "wai_fleet_vectors"
 path = "src/bin/wai_fleet_vectors.rs"
@@ -2329,6 +2342,11 @@ name = "revenue_share"
 path = "tests/revenue_share.rs"
 required-features = ["revenue_share"]
 
+[[test]]
+name = "opportunity_report"
+path = "tests/opportunity_report.rs"
+required-features = ["opportunity_report"]
+
 [[test]]
 name = "fleet"
 path = "tests/fleet.rs"
diff --git a/wai/wai-rs/src/bin/wai_cli/dx/mod.rs b/wai/wai-rs/src/bin/wai_cli/dx/mod.rs
index 0c40c3544..12e35aa36 100644
--- a/wai/wai-rs/src/bin/wai_cli/dx/mod.rs
+++ b/wai/wai-rs/src/bin/wai_cli/dx/mod.rs
@@ -24,7 +24,11 @@
 //! - `contract.create`, `contract.update` (`wai contract create|accept`) and `statement.create`,
 //!   `statement.verify` (`wai statement create|verify`): a channel's share contract and the
 //!   revenue-share statements recomputed from the ledger's invoices and the channel's
-//!   program-as-run (extensions/revenue-share.md §10; `share.rs`).
+//!   program-as-run (extensions/revenue-share.md §10; `share.rs`);
+//! - `opportunity.create`, `opportunity.verify` (`wai opportunity create|verify`) and
+//!   `statement.check` (`wai statement check`): the ad opportunities a channel's signed records
+//!   prove for an owner, and a platform's reported figures checked against them
+//!   (extensions/opportunity-report.md §12; `opportunity.rs`).
 //!
 //! [`envelope`] holds the agent rules every command keeps: the exit codes, the JSON envelope,
 //! `--dry-run`, `--yes`.
@@ -45,6 +49,7 @@ mod dev;
 pub(crate) mod envelope;
 mod fleet;
 mod hello;
+mod opportunity;
 mod share;
 mod verify;
 
@@ -83,6 +88,10 @@ pub const VERBS: &[Impl] = &[
     Impl { id: "contract.update", run: share::contract_update, json: Json::Native },
     Impl { id: "statement.create", run: share::statement_create, json: Json::Native },
     Impl { id: "statement.verify", run: share::statement_verify, json: Json::Native },
+    // The opportunity report and the statement check (extensions/opportunity-report.md §12).
+    Impl { id: "opportunity.create", run: opportunity::opportunity_create, json: Json::Native },
+    Impl { id: "opportunity.verify", run: opportunity::opportunity_verify, json: Json::Native },
+    Impl { id: "statement.check", run: opportunity::statement_check, json: Json::Native },
 ];
 
 /// An operation's synopsis, from the catalogue, for a usage error.
diff --git a/wai/wai-rs/src/bin/wai_cli/dx/opportunity.rs b/wai/wai-rs/src/bin/wai_cli/dx/opportunity.rs
new file mode 100644
index 000000000..e6a3d2130
--- /dev/null
+++ b/wai/wai-rs/src/bin/wai_cli/dx/opportunity.rs
@@ -0,0 +1,187 @@
+//! The opportunity report's operations (extensions/opportunity-report.md §12): `wai opportunity
+//! create` (`opportunity.create`), `wai opportunity verify` (`opportunity.verify`) and `wai
+//! statement check` (`statement.check`), on files on this machine.
+//!
+//! They keep the agent rules of [`super::envelope`], as every operation of the catalogue does:
+//! the exit codes, the JSON envelope with `--json`, `--dry-run` on the two that write (every file
+//! through `out.rs`, nothing written), and `--yes` before a file that exists is replaced. A
+//! refusal by the extension's text has its reason as the code (`cue_section_mismatch`,
+//! `reported_foreign`, ...), at exit 1.
+
+#[cfg(feature = "opportunity_report")]
+use super::envelope as agent;
+use super::envelope::{EXIT_FAILED, OpError};
+#[cfg(feature = "opportunity_report")]
+use super::share::{done, hex, io_fail, number, read_json, read_key, required, write};
+#[cfg(feature = "opportunity_report")]
+use crate::out;
+#[cfg(feature = "opportunity_report")]
+use serde_json::{Value, json};
+
+type R = Result<bool, OpError>;
+
+/// A refusal by the extension's text, its reason as the code.
+#[cfg_attr(not(feature = "opportunity_report"), allow(dead_code))]
+fn refused(what: &str, reason: &'static str, at: &serde_json::Value) -> OpError {
+    OpError::new(EXIT_FAILED, reason, format!("{what} is refused: {reason} at {at}"), "extensions/opportunity-report.md §13 names each reason")
+}
+
+/// A key of 64 hexadecimal digits.
+#[cfg(feature = "opportunity_report")]
+fn key_arg(v: &str, flag: &str, usage: &str) -> Result<[u8; 32], OpError> {
+    (v.len() == 64 && v.bytes().all(|c| c.is_ascii_hexdigit()))
+        .then(|| (0..32).map(|i| u8::from_str_radix(&v[2 * i..2 * i + 2], 16).expect("hex")).collect::<Vec<u8>>())
+        .and_then(|b| b.try_into().ok())
+        .ok_or_else(|| OpError::usage(format!("{flag}: a key, 64 hexadecimal digits"), usage))
+}
+
+/// A report's outcome, for a person: its party, its lines and its totals.
+#[cfg(feature = "opportunity_report")]
+fn summarise(o: &Value) -> String {
+    let d = o["report"].as_str().unwrap_or("");
+    let party = o["party"].as_str().unwrap_or("");
+    let mut t = format!(
+        "opportunity report {}… of the {} {}… for [{}, {}): {} break(s), {} ms, {} slot(s)",
+        &d[..16.min(d.len())],
+        o["role"].as_str().unwrap_or("?"),
+        &party[..16.min(party.len())],
+        o["start"],
+        o["end"],
+        o["totals"]["breaks"],
+        o["totals"]["break_ms"],
+        o["totals"]["slots"],
+    );
+    for l in o["lines"].as_array().into_iter().flatten() {
+        t.push_str(&format!("\n  split {} {:<9} {} break(s), {} ms, {} slot(s), {} unslotted, share {} ppm", l["split"], l["class"].as_str().unwrap_or(""), l["breaks"], l["break_ms"], l["slots"], l["unslotted"], l["ppm"]));
+    }
+    t
+}
+
+/// A check's outcome, for a person: each line with its figures and flags.
+#[cfg(feature = "opportunity_report")]
+fn summarise_check(o: &Value) -> String {
+    let d = o["check"].as_str().unwrap_or("");
+    let r = o["report"].as_str().unwrap_or("");
+    let mut t = format!(
+        "statement check {}… of report {}… beside a reported statement ({}, {}){}",
+        &d[..16.min(d.len())],
+        &r[..16.min(r.len())],
+        o["form"].as_str().unwrap_or("?"),
+        o["basis"].as_str().unwrap_or("?"),
+        if o["statement"].is_null() { "" } else { " and the signed statement" },
+    );
+    for l in o["lines"].as_array().into_iter().flatten() {
+        let flags: Vec<&str> = l["flags"].as_array().into_iter().flatten().filter_map(Value::as_str).collect();
+        t.push_str(&format!(
+            "\n  {:<9} {:<12} {} slot(s), {} impression(s) reported, fill {} ppm{}{}",
+            l["scope"].as_str().unwrap_or(""),
+            l["key"].as_str().unwrap_or(""),
+            l["slots"],
+            l["impressions"],
+            l["fill_ppm"],
+            l["signed"].get("impressions").map(|s| format!(", {s} signed")).unwrap_or_default(),
+            if flags.is_empty() { String::new() } else { format!("  [{}]", flags.join(", ")) },
+        ));
+    }
+    t
+}
+
+#[cfg(not(feature = "opportunity_report"))]
+pub fn opportunity_create(_: &[String]) -> R {
+    Err(crate::door::not_built(wai::catalogue::op("opportunity.create").expect("listed")))
+}
+
+/// `wai opportunity create <inputs.json> --party <key> --start µs --end µs --key <file> [--out F]`:
+/// the report of a party and a period from a document without its report (§8.1), signed by the
+/// issuer key and written with its document.
+#[cfg(feature = "opportunity_report")]
+pub fn opportunity_create(args: &[String]) -> R {
+    use wai::opportunity_report as opp;
+    let usage = super::usage("opportunity.create");
+    let with_value = ["--party", "--start", "--end", "--key", "--out"];
+    let pos = agent::check_args(args, &with_value, &with_value, 1, &usage)?;
+    let path = *pos.first().ok_or_else(|| OpError::usage("the inputs: a report's verification document without its report", &usage))?;
+    let party = key_arg(required(args, "--party", "the party's key: 64 hexadecimal digits", &usage)?, "--party", &usage)?;
+    let (start, end) = (number(args, "--start", &usage)?, number(args, "--end", &usage)?);
+    let key = read_key(required(args, "--key", "the issuer key's file", &usage)?, "the issuer key's file (32 bytes, or 64 hexadecimal digits)")?;
+    let inputs = read_json(path, "the report's inputs")?;
+    let (r, doc) = opp::create(&inputs, &key, party, start, end).map_err(|(reason, at)| refused("the report", reason, &at))?;
+    let o = opp::outcome_json(&opp::verify(&doc));
+    let file = super::opt(args, "--out").map(str::to_string).unwrap_or_else(|| format!("{}.wai-opportunity.json", &hex(&r.digest())[..16]));
+    write(&file, (serde_json::to_string_pretty(&doc).expect("JSON") + "\n").as_bytes(), "the report's document")?;
+    let text = format!("{}{}", summarise(&o), if out::dry_run() { String::new() } else { format!("\nwritten to {file}; check it anywhere with `wai opportunity verify {file}`") });
+    done("opportunity.create", true, json!({"file": file, "report": hex(&r.to_bytes()), "outcome": o}), &text)
+}
+
+#[cfg(not(feature = "opportunity_report"))]
+pub fn opportunity_verify(_: &[String]) -> R {
+    Err(crate::door::not_built(wai::catalogue::op("opportunity.verify").expect("listed")))
+}
+
+/// `wai opportunity verify <document.json>`: a report's (§8.1) or a check's (§11.1) document,
+/// verified; a refusal is exit 1 with its reason as the code.
+#[cfg(feature = "opportunity_report")]
+pub fn opportunity_verify(args: &[String]) -> R {
+    use wai::opportunity_report as opp;
+    let usage = super::usage("opportunity.verify");
+    let pos = agent::check_args(args, &[], &[], 1, &usage)?;
+    let path = *pos.first().ok_or_else(|| OpError::usage("the verification document", &usage))?;
+    let doc = read_json(path, "the verification document")?;
+    if opp::is_check_document(&doc) {
+        let a = opp::verify_check(&doc).map_err(|(r, at)| refused("the check", r, &at))?;
+        let o = opp::check_json(&a);
+        let text = summarise_check(&o);
+        return done("opportunity.verify", false, o, &text);
+    }
+    let a = opp::verify(&doc).map_err(|(r, at)| refused("the report", r, &at))?;
+    let o = opp::accepted_json(&a);
+    let text = summarise(&o);
+    done("opportunity.verify", false, o, &text)
+}
+
+#[cfg(not(feature = "opportunity_report"))]
+pub fn statement_check(_: &[String]) -> R {
+    Err(crate::door::not_built(wai::catalogue::op("statement.check").expect("listed")))
+}
+
+/// A bound in millionths.
+#[cfg(feature = "opportunity_report")]
+fn ppm(args: &[String], flag: &str, default: u32, usage: &str) -> Result<u32, OpError> {
+    match super::opt(args, flag) {
+        None => Ok(default),
+        Some(v) => v.parse().map_err(|_| OpError::usage(format!("{flag} {v}: millionths, an integer"), usage)),
+    }
+}
+
+/// `wai statement check <report.json> <reported> [--statement <document.json>] [--floor ppm]
+/// [--ceiling ppm] --key <file> [--out F]`: the check of a reported statement (§9; CSV for a file
+/// named `.csv`) against a report's document and, when given, a signed statement's (§10), signed
+/// by the issuer key and written with its document.
+#[cfg(feature = "opportunity_report")]
+pub fn statement_check(args: &[String]) -> R {
+    use wai::opportunity_report as opp;
+    let usage = super::usage("statement.check");
+    let with_value = ["--statement", "--floor", "--ceiling", "--key", "--out"];
+    let pos = agent::check_args(args, &with_value, &with_value, 2, &usage)?;
+    let (report_path, reported_path) = match pos.as_slice() {
+        [a, b] => (*a, *b),
+        _ => return Err(OpError::usage("the report's document and the reported statement", &usage)),
+    };
+    let key = read_key(required(args, "--key", "the issuer key's file", &usage)?, "the issuer key's file (32 bytes, or 64 hexadecimal digits)")?;
+    let (floor, ceiling) = (ppm(args, "--floor", opp::FLOOR_PPM, &usage)?, ppm(args, "--ceiling", opp::CEILING_PPM, &usage)?);
+    let report = read_json(report_path, "the report's verification document")?;
+    let raw = std::fs::read(reported_path).map_err(|e| io_fail(reported_path, &e, "the reported statement"))?;
+    let text = String::from_utf8(raw).map_err(|_| OpError::usage(format!("{reported_path}: not UTF-8 text"), &usage))?;
+    let form = if reported_path.ends_with(".csv") { "csv" } else { "json" };
+    let statement = match super::opt(args, "--statement") {
+        Some(p) => read_json(p, "the signed statement's verification document")?,
+        None => Value::Null,
+    };
+    let inputs = json!({"report": report, "reported": {"form": form, "text": text}, "statement": statement});
+    let (c, doc) = opp::create_check(&inputs, &key, floor, ceiling).map_err(|(reason, at)| refused("the check", reason, &at))?;
+    let o = opp::check_outcome_json(&opp::verify_check(&doc));
+    let file = super::opt(args, "--out").map(str::to_string).unwrap_or_else(|| format!("{}.wai-check.json", &hex(&c.digest())[..16]));
+    write(&file, (serde_json::to_string_pretty(&doc).expect("JSON") + "\n").as_bytes(), "the check's document")?;
+    let text = format!("{}{}", summarise_check(&o), if out::dry_run() { String::new() } else { format!("\nwritten to {file}; check it anywhere with `wai opportunity verify {file}`") });
+    done("statement.check", true, json!({"file": file, "check": hex(&c.to_bytes()), "outcome": o}), &text)
+}
diff --git a/wai/wai-rs/src/bin/wai_cli/dx/share.rs b/wai/wai-rs/src/bin/wai_cli/dx/share.rs
index 00012a8b2..47f2e605d 100644
--- a/wai/wai-rs/src/bin/wai_cli/dx/share.rs
+++ b/wai/wai-rs/src/bin/wai_cli/dx/share.rs
@@ -22,7 +22,7 @@ type R = Result<bool, OpError>;
 /// Print what an operation did: its envelope with `--json`, its text otherwise; in a dry run of
 /// an operation that writes, with the plan of what it would have written.
 #[cfg_attr(not(feature = "revenue_share"), allow(dead_code))]
-fn done(op: &str, writes: bool, data: Value, text: &str) -> R {
+pub(super) fn done(op: &str, writes: bool, data: Value, text: &str) -> R {
     let plan = (writes && out::dry_run()).then(out::plan);
     if agent::ctx().json {
         agent::print(&agent::envelope_with(op, true, data, plan));
@@ -40,7 +40,7 @@ fn done(op: &str, writes: bool, data: Value, text: &str) -> R {
 
 /// A file that could not be read or written.
 #[cfg_attr(not(feature = "revenue_share"), allow(dead_code))]
-fn io_fail(path: &str, e: &std::io::Error, hint: &str) -> OpError {
+pub(super) fn io_fail(path: &str, e: &std::io::Error, hint: &str) -> OpError {
     match e.kind() {
         std::io::ErrorKind::NotFound => OpError::new(EXIT_NOT_FOUND, "not-found", format!("{path}: {e}"), hint),
         std::io::ErrorKind::PermissionDenied => OpError::new(EXIT_PERMISSION, "permission-denied", format!("{path}: {e}"), "the file's owner runs this"),
@@ -55,13 +55,13 @@ fn refused(what: &str, reason: &'static str, at: &Value) -> OpError {
 }
 
 #[cfg_attr(not(feature = "revenue_share"), allow(dead_code))]
-fn hex(b: &[u8]) -> String {
+pub(super) fn hex(b: &[u8]) -> String {
     b.iter().map(|x| format!("{x:02x}")).collect()
 }
 
 /// A key file: 32 bytes, or 64 hexadecimal digits.
 #[cfg(feature = "revenue_share")]
-fn read_key(path: &str, what: &str) -> Result<ed25519_dalek::SigningKey, OpError> {
+pub(super) fn read_key(path: &str, what: &str) -> Result<ed25519_dalek::SigningKey, OpError> {
     let raw = std::fs::read(path).map_err(|e| io_fail(path, &e, what))?;
     let seed: [u8; 32] = if raw.len() == 32 {
         raw.try_into().expect("32")
@@ -78,14 +78,14 @@ fn read_key(path: &str, what: &str) -> Result<ed25519_dalek::SigningKey, OpError
 }
 
 #[cfg(feature = "revenue_share")]
-fn read_json(path: &str, what: &str) -> Result<Value, OpError> {
+pub(super) fn read_json(path: &str, what: &str) -> Result<Value, OpError> {
     let b = std::fs::read(path).map_err(|e| io_fail(path, &e, what))?;
     serde_json::from_slice(&b).map_err(|e| OpError::usage(format!("{path}: not JSON: {e}"), what))
 }
 
 /// Write `bytes` to `file`, asking first when it exists; in a dry run, plan it.
 #[cfg(feature = "revenue_share")]
-fn write(file: &str, bytes: &[u8], what: &str) -> Result<(), OpError> {
+pub(super) fn write(file: &str, bytes: &[u8], what: &str) -> Result<(), OpError> {
     if !out::dry_run() && std::path::Path::new(file).exists() {
         agent::confirm(&format!("{file} exists, and {what} would replace it"), vec![json!({"write": file, "bytes": bytes.len(), "replaces": true})])?;
     }
@@ -93,12 +93,12 @@ fn write(file: &str, bytes: &[u8], what: &str) -> Result<(), OpError> {
 }
 
 #[cfg(feature = "revenue_share")]
-fn required<'a>(args: &'a [String], flag: &str, what: &str, usage: &str) -> Result<&'a str, OpError> {
+pub(super) fn required<'a>(args: &'a [String], flag: &str, what: &str, usage: &str) -> Result<&'a str, OpError> {
     super::opt(args, flag).ok_or_else(|| OpError::usage(format!("{flag}: {what}"), usage))
 }
 
 #[cfg(feature = "revenue_share")]
-fn number(args: &[String], flag: &str, usage: &str) -> Result<u64, OpError> {
+pub(super) fn number(args: &[String], flag: &str, usage: &str) -> Result<u64, OpError> {
     let v = required(args, flag, "microseconds since 1970", usage)?;
     v.parse().map_err(|_| OpError::usage(format!("{flag} {v}: microseconds since 1970, an integer"), usage))
 }
diff --git a/wai/wai-rs/src/bin/wai_opportunity_vectors.rs b/wai/wai-rs/src/bin/wai_opportunity_vectors.rs
new file mode 100644
index 000000000..32caeadbd
--- /dev/null
+++ b/wai/wai-rs/src/bin/wai_opportunity_vectors.rs
@@ -0,0 +1,61 @@
+//! Conformance corpus for the opportunity report (`live-conformance/opportunity/`,
+//! extensions/opportunity-report.md §14).
+//!
+//!   wai_opportunity_vectors gen     <corpus-dir>   write vectors.json, from fixed seeds
+//!   wai_opportunity_vectors verify  <corpus-dir>   vectors.json regenerates byte for byte, and
+//!                                                   every vector gets the outcome it states
+//!
+//! The generator and this verifier are one implementation. The corpus's second implementation is
+//! `live-conformance/opportunity_report_verify.py`, written from the extension's text and sharing
+//! no code with this binary.
+
+use std::path::Path;
+use wai::opportunity_report::corpus;
+
+fn main() {
+    let a: Vec<String> = std::env::args().collect();
+    match (a.get(1).map(String::as_str), a.get(2)) {
+        (Some("gen"), Some(d)) => {
+            let p = Path::new(d).join("vectors.json");
+            let text = match corpus::generate() {
+                Ok(t) => t,
+                Err(e) => {
+                    eprintln!("generate: {e}");
+                    std::process::exit(1);
+                }
+            };
+            if let Err(e) = std::fs::create_dir_all(d).and_then(|_| std::fs::write(&p, text)) {
+                eprintln!("write {}: {e}", p.display());
+                std::process::exit(1);
+            }
+            println!("wrote {}", p.display());
+        }
+        (Some("verify"), Some(d)) => std::process::exit(verify(Path::new(d))),
+        _ => {
+            eprintln!("usage: wai_opportunity_vectors gen|verify <corpus-dir>");
+            std::process::exit(2);
+        }
+    }
+}
+
+fn verify(dir: &Path) -> i32 {
+    let p = dir.join("vectors.json");
+    let doc = match std::fs::read_to_string(&p) {
+        Ok(s) => s,
+        Err(e) => {
+            eprintln!("read {}: {e}", p.display());
+            return 1;
+        }
+    };
+    let mut fail = 0;
+    let same = corpus::generate().is_ok_and(|g| g == doc);
+    println!("{} vectors.json regenerates byte for byte from its seeds", if same { "PASS" } else { "FAIL" });
+    fail += (!same) as i32;
+    let fails = corpus::verify(&doc);
+    for f in &fails {
+        println!("FAIL {f}");
+    }
+    println!("{} every vector gets the outcome the corpus states", if fails.is_empty() { "PASS" } else { "FAIL" });
+    fail += (!fails.is_empty()) as i32;
+    (fail != 0) as i32
+}
diff --git a/wai/wai-rs/src/catalogue.rs b/wai/wai-rs/src/catalogue.rs
index b80d17c17..7ffb3b7ce 100644
--- a/wai/wai-rs/src/catalogue.rs
+++ b/wai/wai-rs/src/catalogue.rs
@@ -301,6 +301,10 @@ const S_APP_CHECK: &str = r#"{"type":"object","required":["program","errors","fa
 const S_SHARE_CONTRACT: &str = r#"{"type":"object","required":["digest","operator","channel","owners","in_force","contract","file"],"description":"The share contract (WRC1, hexadecimal), its digest, each owner and whether it has countersigned, and the file it went to"}"#;
 const S_SHARE_STATEMENT: &str = r#"{"type":"object","required":["file","statement","outcome"],"description":"The statement (WRS1, hexadecimal), the file its verification document went to, and its outcome, recomputed here"}"#;
 const S_SHARE_OUTCOME: &str = r#"{"type":"object","required":["outcome","statement","contract","party","role","lines","total"],"description":"An accepted statement's outcome (revenue-share §8.3): its lines, each split's division, every impression attributed, and the total"}"#;
+// The opportunity report's outputs (extensions/opportunity-report.md §12).
+const S_OPPORTUNITY: &str = r#"{"type":"object","required":["file","report","outcome"],"description":"The opportunity report (WOR1, hexadecimal), the file its verification document went to, and its outcome, recomputed here"}"#;
+const S_OPPORTUNITY_OUTCOME: &str = r#"{"type":"object","required":["outcome"],"description":"An accepted report's outcome (opportunity-report §8.3: every break attributed, each line and the totals) or an accepted check's (§11.3: each line's opportunities, reported and signed figures and flags)"}"#;
+const S_STATEMENT_CHECK: &str = r#"{"type":"object","required":["file","check","outcome"],"description":"The statement check (WCK1, hexadecimal), the file its verification document went to, and its outcome, recomputed here"}"#;
 const S_ENROLMENT: &str = r#"{"type":"object","required":["node","role","organisation","digest","enrolment"],"description":"The enrolment (WFE1, hexadecimal), its digest, and the file and service it went to"}"#;
 const S_ENROLMENTS: &str = r#"{"type":"object","required":["enrolments"],"description":"Each node the fleet service holds enrolled: its key, role, label and records"}"#;
 const S_REPORT: &str = r#"{"type":"object","required":["report","outcome"],"description":"The report's digest and its outcome as extensions/fleet.md §7.3 states it"}"#;
@@ -1559,6 +1563,68 @@ http vectors diff|fuzz <dir> --seed S --count N --out F",
         needs: Needs::All(&["revenue_share"]),
         ..OP
     },
+    // ─── the opportunity report and the statement check (extensions/opportunity-report.md §12) ───
+    Op {
+        id: "opportunity.create",
+        summary: "A party's opportunity report for a period: the ad breaks a channel's signed cues and program-as-run prove in the programmes it shares in, signed with the issuer key",
+        cli: Some("opportunity create"),
+        usage: "opportunity create <inputs.json> --party <key> --start µs --end µs --key <file> [--out F] [--yes]   the report
+    (WOR1) of the party for [start, end), computed from a verification document without its report (the
+    contract, other contracts, runs and rooms), signed with the issuer key and written with its document to F
+    (<digest>.wai-opportunity.json) for `wai opportunity verify`; replacing a file waits for --yes",
+        effect: Effect::WritesProject,
+        stability: Stability::Preview,
+        input: &[
+            pos("inputs", Ty::Path, true, "A verification document without its report: contract, contracts, runs and rooms."),
+            flag("party", "--party", Ty::String, true, "The party's key, 64 hexadecimal digits: the operator or an owner."),
+            flag("start", "--start", Ty::Integer, true, "The period's start, microseconds since 1970."),
+            flag("end", "--end", Ty::Integer, true, "The period's end, after its start."),
+            flag("key", "--key", Ty::Path, true, "The issuer key's file: 32 bytes, or 64 hexadecimal digits."),
+            flag("out", "--out", Ty::Path, false, "The verification document's file (<digest>.wai-opportunity.json)."),
+        ],
+        output: Output::Json(S_OPPORTUNITY),
+        receipt: true,
+        needs: Needs::All(&["opportunity_report"]),
+        confirm: Some(Confirm::AnyFile),
+        ..OP
+    },
+    Op {
+        id: "opportunity.verify",
+        summary: "An opportunity report's or a statement check's verification document checked: every break, line and flag recomputed from the records, or the reason it is refused",
+        cli: Some("opportunity verify"),
+        usage: "opportunity verify <document.json>   the outcome of a report's or a check's verification document: each break
+    attributed, each line and flag recomputed; exit 1 with the reason on a refusal",
+        stability: Stability::Preview,
+        input: &[pos("document", Ty::Path, true, "The verification document: a report's (contract, contracts, report, runs, rooms) or a check's (report, reported, statement, check).")],
+        output: Output::Json(S_OPPORTUNITY_OUTCOME),
+        needs: Needs::All(&["opportunity_report"]),
+        ..OP
+    },
+    Op {
+        id: "statement.check",
+        summary: "A platform's reported statement checked against an opportunity report and, when given, the operator's signed statement, signed with the issuer key",
+        cli: Some("statement check"),
+        usage: "statement check <report.json> <reported> [--statement <document.json>] [--floor ppm] [--ceiling ppm] --key <file> [--out F] [--yes]
+    the check (WCK1) of a reported statement (JSON, or CSV for a file named .csv) beside a report's verification
+    document and a signed statement's, at the bounds given (500000 and 2000000 when not), signed with the issuer
+    key and written with its document to F (<digest>.wai-check.json); replacing a file waits for --yes",
+        effect: Effect::WritesProject,
+        stability: Stability::Preview,
+        input: &[
+            pos("report", Ty::Path, true, "A report's verification document, with its report."),
+            pos("reported", Ty::Path, true, "The reported statement: JSON, or CSV for a file named .csv."),
+            flag("statement", "--statement", Ty::Path, false, "A signed revenue-share statement's verification document of the same party and period."),
+            flag("floor", "--floor", Ty::Integer, false, "The lower bound, in millionths of the period's rate (500000)."),
+            flag("ceiling", "--ceiling", Ty::Integer, false, "The upper bound, in millionths of the period's rate (2000000)."),
+            flag("key", "--key", Ty::Path, true, "The issuer key's file: 32 bytes, or 64 hexadecimal digits."),
+            flag("out", "--out", Ty::Path, false, "The verification document's file (<digest>.wai-check.json)."),
+        ],
+        output: Output::Json(S_STATEMENT_CHECK),
+        receipt: true,
+        needs: Needs::All(&["opportunity_report"]),
+        confirm: Some(Confirm::AnyFile),
+        ..OP
+    },
     // ─── the catalogue itself ───
     Op {
         id: "ops.list",
@@ -1629,6 +1695,7 @@ pub fn feature_on(feature: &str) -> Option<bool> {
         "app" => cfg!(feature = "app"),
         "fleet" => cfg!(feature = "fleet"),
         "revenue_share" => cfg!(feature = "revenue_share"),
+        "opportunity_report" => cfg!(feature = "opportunity_report"),
         _ => return None,
     })
 }
diff --git a/wai/wai-rs/src/codecs/registry.rs b/wai/wai-rs/src/codecs/registry.rs
index 8fde5e039..267bcf298 100644
--- a/wai/wai-rs/src/codecs/registry.rs
+++ b/wai/wai-rs/src/codecs/registry.rs
@@ -240,6 +240,7 @@ pub const CAP_DELIVERY_LEDGER: &str = "wai.delivery.ledger";
 pub const CAP_DELIVERY_AUDIT: &str = "wai.delivery.audit";
 pub const CAP_DELIVERY_FLEET: &str = "wai.delivery.fleet";
 pub const CAP_DELIVERY_REVENUE_SHARE: &str = "wai.delivery.revenue_share";
+pub const CAP_DELIVERY_OPPORTUNITY: &str = "wai.delivery.opportunity";
 pub const CAP_MEDIA_TAKEDOWN: &str = "wai.media.takedown";
 pub const CAP_LIVE_COPERFORMANCE: &str = "wai.live.coperformance";
 pub const CAP_MEDIA_INFLUENCE: &str = "wai.media.influence";
@@ -367,6 +368,7 @@ const ROWS: &[(&str, &str, Option<&str>, &str)] = &[
     (CAP_DELIVERY_AUDIT, S_INTERACTIVE, None, "2026-10-25"),
     (CAP_DELIVERY_FLEET, S_INTERACTIVE, None, "2026-10-27"),
     (CAP_DELIVERY_REVENUE_SHARE, S_INTERACTIVE, None, "2026-10-29"),
+    (CAP_DELIVERY_OPPORTUNITY, S_INTERACTIVE, None, "2026-10-29"),
     (CAP_MEDIA_TAKEDOWN, S_INTERACTIVE, None, "2026-10-21"),
     (CAP_LIVE_COPERFORMANCE, S_INTERACTIVE, None, "2026-10-21"),
     (CAP_MEDIA_INFLUENCE, S_INTERACTIVE, None, "2026-10-21"),
@@ -461,6 +463,7 @@ const RECORDS: &[&str] = &[
     CAP_DELIVERY_AUDIT,
     CAP_DELIVERY_FLEET,
     CAP_DELIVERY_REVENUE_SHARE,
+    CAP_DELIVERY_OPPORTUNITY,
     CAP_MEDIA_TAKEDOWN,
     CAP_LIVE_COPERFORMANCE,
     CAP_MEDIA_INFLUENCE,
@@ -660,6 +663,7 @@ const LEDGER: &str = "extensions/receipt-ledger.md";
 const STREAM_AUDIT: &str = "extensions/stream-audit.md";
 const FLEET: &str = "extensions/fleet.md";
 const REVENUE_SHARE: &str = "extensions/revenue-share.md";
+const OPPORTUNITY: &str = "extensions/opportunity-report.md";
 const BROWSER_SINK: &str = "extensions/browser-sink.md";
 const TAKEDOWN: &str = "extensions/takedown.md";
 const INFLUENCE: &str = "extensions/influence.md";
@@ -837,6 +841,8 @@ pub const WIRE_IDENTIFIERS: &[WireIdentifier] = &[
     wire(".wai-fleet.json", WireKind::Path, FLEET, "§7.1", WireStatus::Defined),
     wire("WRC1", WireKind::Magic, REVENUE_SHARE, "§3.1", WireStatus::Defined),
     wire("WRS1", WireKind::Magic, REVENUE_SHARE, "§7.1", WireStatus::Defined),
+    wire("WOR1", WireKind::Magic, OPPORTUNITY, "§7.1", WireStatus::Defined),
+    wire("WCK1", WireKind::Magic, OPPORTUNITY, "§10.1", WireStatus::Defined),
     wire("contentBinding", WireKind::FrameMetadata, BROWSER_SINK, "§7.1", WireStatus::Proposed),
     wire("wai-takedown-clocks", WireKind::DocumentKind, TAKEDOWN, "§4", WireStatus::Defined),
     wire("wai-takedown-policy", WireKind::DocumentKind, TAKEDOWN, "§5.1", WireStatus::Defined),
diff --git a/wai/wai-rs/src/lib.rs b/wai/wai-rs/src/lib.rs
index 5e7ed726b..c045749ec 100644
--- a/wai/wai-rs/src/lib.rs
+++ b/wai/wai-rs/src/lib.rs
@@ -741,6 +741,14 @@ pub mod receipt_ledger;
 /// cbindgen:ignore
 #[cfg(feature = "revenue_share")]
 pub mod revenue_share;
+// Opportunity report (extensions/opportunity-report.md): `wai.delivery.opportunity` — the ad breaks
+// a channel's own signed records prove for one party and one period (a room's cues and their SCTE 35
+// sections, the program-as-run's ad entries), attributed by the share contract, and the check of a
+// platform's reported figures against them and the signed revenue-share statement. Rust-only, like
+// the other record modules: its constants must not become macros in include/wai.h.
+/// cbindgen:ignore
+#[cfg(feature = "opportunity_report")]
+pub mod opportunity_report;
 // Stream audit (extensions/stream-audit.md): `wai.delivery.audit` — a player's signed evidence of a
 // stream another service delivers over HTTP (acknowledgements by plain SHA-256, presentation claims for
 // marked ads, the session record), the bundle a collector verifies, and the channel report it signs
diff --git a/wai/wai-rs/src/opportunity_report.rs b/wai/wai-rs/src/opportunity_report.rs
new file mode 100644
index 000000000..f3de7efc9
--- /dev/null
+++ b/wai/wai-rs/src/opportunity_report.rs
@@ -0,0 +1,1551 @@
+//! Opportunity report — `wai.delivery.opportunity` ([extensions/opportunity-report.md]).
+//!
+//! The ad opportunities a linear channel's own signed records prove, per content owner and per
+//! period, and the check of a platform's reported figures against them. An **opportunity report**
+//! (`WOR1`) states, for one party of a [`crate::revenue_share`] contract and one period, the ad
+//! breaks that aired in the programmes of the splits it shares in: each break from the cues of a
+//! room the contract names (made into breaks by [`crate::live_ads::verify`], the SCTE 35 sections
+//! they carry read by [`section`]) or from an ad entry of the channel's signed program-as-run,
+//! placed at its start on a window that aired it and attributed to the programme on air; and, per
+//! split and class, the breaks, their seconds and their slots, with the records each line came
+//! from. A **reported statement** ([`reported`]) is what a platform says it counted. A
+//! **statement check** (`WCK1`) sets the report beside it and, where given, beside the
+//! operator's signed revenue-share statement.
+//!
+//! What this module implements, by section of the extension:
+//!
+//! - §3: the evidence: the contract, the runs and the rooms;
+//! - §4, §6: breaks ([`Break`]), cued and scheduled, their slots, and their attribution;
+//! - §5: the section a cue carries ([`section`]);
+//! - §7, §8: the report ([`Report`]), its lines ([`compute`]), its verification ([`verify`]) and
+//!   [`create`];
+//! - §9: the reported statement ([`reported`]);
+//! - §10, §11: the check ([`Check`]), its lines ([`check_lines`]), [`verify_check`] and
+//!   [`create_check`].
+//!
+//! The corpus `live-conformance/opportunity/` is written by [`corpus::generate`] and checked by
+//! [`corpus::verify`], and by `live-conformance/opportunity_report_verify.py`, which shares no
+//! code with this module.
+//!
+//! [extensions/opportunity-report.md]: ../../extensions/opportunity-report.md
+
+use std::collections::{BTreeMap, BTreeSet};
+
+use ed25519_dalek::{Signer, SigningKey};
+use serde_json::{Map, Value, json};
+use sha2::{Digest, Sha256};
+
+use crate::live_ads as ads;
+use crate::live_events::{self as events, Event, Payload, kind};
+use crate::live_room as room;
+use crate::revenue_share::{self as share, Contract, hex, unhex};
+use crate::wai_video_channel::{ChannelReceipt, EntryKind};
+
+pub mod corpus;
+pub mod reported;
+pub mod section;
+
+use reported::{Reported, basis, form};
+
+pub const CAPABILITY: &str = "wai.delivery.opportunity";
+pub const REPORT_MAGIC: [u8; 4] = *b"WOR1";
+pub const CHECK_MAGIC: [u8; 4] = *b"WCK1";
+pub const VERSION: u8 = 1;
+pub const REPORT_DOMAIN: &[u8] = b"wai:opportunity-report\x01";
+pub const CHECK_DOMAIN: &[u8] = b"wai:statement-check\x01";
+pub const CITES_DOMAIN: &[u8] = b"wai:opportunity-cites\x01";
+pub const WHOLE: u32 = 1_000_000;
+/// A report's line, in bytes (§7.2).
+pub const LINE_LEN: usize = 75;
+/// The bounds `statement.check` uses when none is given (§12).
+pub const FLOOR_PPM: u32 = 500_000;
+pub const CEILING_PPM: u32 = 2_000_000;
+
+/// The classes of a break (§4.3).
+pub mod class {
+    pub const CUED: u8 = 1;
+    pub const SCHEDULED: u8 = 2;
+
+    pub fn name(c: u8) -> &'static str {
+        match c {
+            CUED => "cued",
+            SCHEDULED => "scheduled",
+            _ => "?",
+        }
+    }
+}
+
+/// The kinds of a cited record (§7.3).
+pub mod record_kind {
+    pub const RUN: u8 = 10;
+    pub const CUE: u8 = 12;
+    pub const POLICY: u8 = 13;
+}
+
+/// The scopes of a check's line (§10.2).
+pub mod scope {
+    pub const PERIOD: u8 = 1;
+    pub const DAY: u8 = 2;
+    pub const PROGRAMME: u8 = 3;
+
+    pub fn name(s: u8) -> &'static str {
+        match s {
+            PERIOD => "period",
+            DAY => "day",
+            PROGRAMME => "programme",
+            _ => "?",
+        }
+    }
+}
+
+/// The flags of a check's line (§10.3), by bit.
+pub const FLAGS: [&str; 7] = ["unproved", "above", "below", "impressions_above_signed", "impressions_below_signed", "revenue_above_signed", "revenue_below_signed"];
+
+// ---------------------------------------------------------------------------------------
+// Reasons
+// ---------------------------------------------------------------------------------------
+
+/// The codes this extension adds (§13).
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
+pub enum Reason {
+    RoomForeign,
+    RoomRepeated,
+    CueSectionInvalid,
+    CueSectionMismatch,
+    OpportunityReportInvalid,
+    OpportunityReportMismatch,
+    ReportedInvalid,
+    ReportedForeign,
+    StatementForeign,
+    StatementCheckInvalid,
+    StatementCheckMismatch,
+}
+
+impl Reason {
+    /// §13's order.
+    pub const ALL: [Reason; 11] = [
+        Reason::RoomForeign,
+        Reason::RoomRepeated,
+        Reason::CueSectionInvalid,
+        Reason::CueSectionMismatch,
+        Reason::OpportunityReportInvalid,
+        Reason::OpportunityReportMismatch,
+        Reason::ReportedInvalid,
+        Reason::ReportedForeign,
+        Reason::StatementForeign,
+        Reason::StatementCheckInvalid,
+        Reason::StatementCheckMismatch,
+    ];
+
+    /// The codes of other extensions this one raises itself (§13).
+    pub const REUSED: [&'static str; 13] = [
+        "truncated",
+        "malformed",
+        "unknown_version",
+        "bad_key",
+        "bad_signature",
+        "contract_mismatch",
+        "outside_contract",
+        "delivery_gap",
+        "break_overlap",
+        "outside_window",
+        "asset_unmapped",
+        "line_unsourced",
+        "citation_mismatch",
+    ];
+
+    pub fn code(self) -> &'static str {
+        match self {
+            Reason::RoomForeign => "room_foreign",
+            Reason::RoomRepeated => "room_repeated",
+            Reason::CueSectionInvalid => "cue_section_invalid",
+            Reason::CueSectionMismatch => "cue_section_mismatch",
+            Reason::OpportunityReportInvalid => "opportunity_report_invalid",
+            Reason::OpportunityReportMismatch => "opportunity_report_mismatch",
+            Reason::ReportedInvalid => "reported_invalid",
+            Reason::ReportedForeign => "reported_foreign",
+            Reason::StatementForeign => "statement_foreign",
+            Reason::StatementCheckInvalid => "statement_check_invalid",
+            Reason::StatementCheckMismatch => "statement_check_mismatch",
+        }
+    }
+}
+
+impl std::fmt::Display for Reason {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(self.code())
+    }
+}
+
+/// A refusal: the reason's code, and where, as a JSON array.
+pub type Refusal = (&'static str, Value);
+
+const TRUNCATED: &str = "truncated";
+const MALFORMED: &str = "malformed";
+const UNKNOWN_VERSION: &str = "unknown_version";
+const CONTRACT_MISMATCH: &str = "contract_mismatch";
+const OUTSIDE_CONTRACT: &str = "outside_contract";
+const DELIVERY_GAP: &str = "delivery_gap";
+const BREAK_OVERLAP: &str = "break_overlap";
+const OUTSIDE_WINDOW: &str = "outside_window";
+const ASSET_UNMAPPED: &str = "asset_unmapped";
+const LINE_UNSOURCED: &str = "line_unsourced";
+const CITATION_MISMATCH: &str = "citation_mismatch";
+
+// ---------------------------------------------------------------------------------------
+// Bytes
+// ---------------------------------------------------------------------------------------
+
+fn sha256(parts: &[&[u8]]) -> [u8; 32] {
+    let mut h = Sha256::new();
+    for p in parts {
+        h.update(p);
+    }
+    h.finalize().into()
+}
+
+fn ascending<T: PartialOrd>(v: &[T]) -> bool {
+    v.windows(2).all(|w| w[0] < w[1])
+}
+
+fn sign(key: &SigningKey, domain: &[u8], body: &[u8]) -> [u8; 64] {
+    let mut m = domain.to_vec();
+    m.extend_from_slice(body);
+    key.sign(&m).to_bytes()
+}
+
+fn check_sig(key: &[u8; 32], domain: &[u8], body: &[u8], sig: &[u8; 64]) -> Result<(), &'static str> {
+    let mut m = domain.to_vec();
+    m.extend_from_slice(body);
+    crate::sig::verify_strict(key, &m, sig).map_err(|e| match e {
+        crate::sig::SigError::BadKey => "bad_key",
+        crate::sig::SigError::BadSignature => "bad_signature",
+    })
+}
+
+/// A cursor; running out is `truncated`.
+struct Rd<'a> {
+    b: &'a [u8],
+    p: usize,
+}
+
+impl<'a> Rd<'a> {
+    fn take(&mut self, n: usize) -> Result<&'a [u8], &'static str> {
+        let e = self.p.checked_add(n).filter(|&e| e <= self.b.len()).ok_or(TRUNCATED)?;
+        let s = &self.b[self.p..e];
+        self.p = e;
+        Ok(s)
+    }
+    fn arr<const N: usize>(&mut self) -> Result<[u8; N], &'static str> {
+        Ok(self.take(N)?.try_into().expect("N bytes"))
+    }
+    fn u8(&mut self) -> Result<u8, &'static str> {
+        Ok(self.take(1)?[0])
+    }
+    fn u16(&mut self) -> Result<u16, &'static str> {
+        Ok(u16::from_le_bytes(self.arr()?))
+    }
+    fn u32(&mut self) -> Result<u32, &'static str> {
+        Ok(u32::from_le_bytes(self.arr()?))
+    }
+    fn u64(&mut self) -> Result<u64, &'static str> {
+        Ok(u64::from_le_bytes(self.arr()?))
+    }
+    fn text(&mut self) -> Result<Vec<u8>, &'static str> {
+        let n = self.u16()? as usize;
+        Ok(self.take(n)?.to_vec())
+    }
+    fn digests(&mut self) -> Result<Vec<[u8; 32]>, &'static str> {
+        let n = self.u16()? as usize;
+        (0..n).map(|_| self.arr()).collect()
+    }
+    fn done(&self) -> bool {
+        self.p == self.b.len()
+    }
+}
+
+/// The first steps of reading (§7.5, §10.6): the magic and the version.
+fn read_head(b: &[u8], magic: &[u8; 4]) -> Result<(), &'static str> {
+    if b.len() < 4 {
+        return Err(TRUNCATED);
+    }
+    if &b[..4] != magic {
+        return Err(MALFORMED);
+    }
+    match b.get(4) {
+        None => Err(TRUNCATED),
+        Some(&VERSION) => Ok(()),
+        Some(_) => Err(UNKNOWN_VERSION),
+    }
+}
+
+fn put_digests(o: &mut Vec<u8>, l: &[[u8; 32]]) {
+    o.extend_from_slice(&u16::try_from(l.len()).expect("at most 65535 entries").to_le_bytes());
+    for d in l {
+        o.extend_from_slice(d);
+    }
+}
+
+/// `prefix` followed by the elements of `rest`.
+fn place(prefix: Value, rest: Value) -> Value {
+    let mut v = prefix.as_array().cloned().unwrap_or_default();
+    v.extend(rest.as_array().cloned().unwrap_or_default());
+    Value::Array(v)
+}
+
+// ---------------------------------------------------------------------------------------
+// §7 The opportunity report
+// ---------------------------------------------------------------------------------------
+
+/// A report's line (§7.2).
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Line {
+    pub split: u16,
+    pub class: u8,
+    pub breaks: u64,
+    pub break_ms: u64,
+    pub slots: u64,
+    pub unslotted: u64,
+    pub ppm: u32,
+    pub cited: u32,
+    pub cites: [u8; 32],
+}
+
+impl Line {
+    fn key(&self) -> (u16, u8) {
+        (self.split, self.class)
+    }
+}
+
+/// An opportunity report (§7.1).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Report {
+    pub issuer: [u8; 32],
+    pub contract: [u8; 32],
+    pub party: [u8; 32],
+    pub start: u64,
+    pub end: u64,
+    pub rooms: Vec<[u8; 32]>,
+    pub runs: Vec<[u8; 32]>,
+    pub lines: Vec<Line>,
+    pub breaks: u64,
+    pub break_ms: u64,
+    pub slots: u64,
+    pub sig: [u8; 64],
+}
+
+impl Report {
+    /// The report without `sig`.
+    pub fn body(&self) -> Vec<u8> {
+        let mut o = Vec::with_capacity(200 + 32 * (self.rooms.len() + self.runs.len()) + LINE_LEN * self.lines.len());
+        o.extend_from_slice(&REPORT_MAGIC);
+        o.push(VERSION);
+        o.extend_from_slice(&self.issuer);
+        o.extend_from_slice(&self.contract);
+        o.extend_from_slice(&self.party);
+        o.extend_from_slice(&self.start.to_le_bytes());
+        o.extend_from_slice(&self.end.to_le_bytes());
+        put_digests(&mut o, &self.rooms);
+        put_digests(&mut o, &self.runs);
+        o.extend_from_slice(&u16::try_from(self.lines.len()).expect("at most 65535 lines").to_le_bytes());
+        for l in &self.lines {
+            o.extend_from_slice(&l.split.to_le_bytes());
+            o.push(l.class);
+            for v in [l.breaks, l.break_ms, l.slots, l.unslotted] {
+                o.extend_from_slice(&v.to_le_bytes());
+            }
+            o.extend_from_slice(&l.ppm.to_le_bytes());
+            o.extend_from_slice(&l.cited.to_le_bytes());
+            o.extend_from_slice(&l.cites);
+        }
+        for v in [self.breaks, self.break_ms, self.slots] {
+            o.extend_from_slice(&v.to_le_bytes());
+        }
+        o
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let mut o = self.body();
+        o.extend_from_slice(&self.sig);
+        o
+    }
+
+    /// Its digest (§7.4).
+    pub fn digest(&self) -> [u8; 32] {
+        sha256(&[&self.body()])
+    }
+
+    /// Signed by its issuer (§7.4), whose key it names.
+    pub fn sign(mut self, issuer: &SigningKey) -> Report {
+        self.issuer = issuer.verifying_key().to_bytes();
+        self.sig = sign(issuer, REPORT_DOMAIN, &self.body());
+        self
+    }
+
+    /// Read a report and hold it to its rules (§7.5); its signature is checked in §8.2 step 3.
+    pub fn read(b: &[u8]) -> Result<Report, &'static str> {
+        read_head(b, &REPORT_MAGIC)?;
+        let mut r = Rd { b, p: 5 };
+        let (issuer, contract, party) = (r.arr()?, r.arr()?, r.arr()?);
+        let (start, end) = (r.u64()?, r.u64()?);
+        let rooms = r.digests()?;
+        let runs = r.digests()?;
+        let n = r.u16()? as usize;
+        let mut lines = Vec::with_capacity(n);
+        for _ in 0..n {
+            lines.push(Line {
+                split: r.u16()?,
+                class: r.u8()?,
+                breaks: r.u64()?,
+                break_ms: r.u64()?,
+                slots: r.u64()?,
+                unslotted: r.u64()?,
+                ppm: r.u32()?,
+                cited: r.u32()?,
+                cites: r.arr()?,
+            });
+        }
+        let (breaks, break_ms, slots) = (r.u64()?, r.u64()?, r.u64()?);
+        let sig = r.arr()?;
+        if !r.done() {
+            return Err(MALFORMED);
+        }
+        let rep = Report { issuer, contract, party, start, end, rooms, runs, lines, breaks, break_ms, slots, sig };
+        let keys: Vec<(u16, u8)> = rep.lines.iter().map(Line::key).collect();
+        let rules = rep.start < rep.end
+            && rep.issuer != [0; 32]
+            && rep.party != [0; 32]
+            && ascending(&rep.rooms)
+            && ascending(&rep.runs)
+            && ascending(&keys)
+            && rep.lines.iter().all(|l| (1..=2).contains(&l.class) && l.breaks > 0 && l.cited > 0 && l.unslotted <= l.breaks && (1..=WHOLE).contains(&l.ppm));
+        if !rules {
+            return Err(Reason::OpportunityReportInvalid.code());
+        }
+        Ok(rep)
+    }
+}
+
+/// A line's citation digest (§7.3) over its cited records, in ascending order.
+pub fn cites_digest(cited: &Cited) -> [u8; 32] {
+    let mut h = Sha256::new();
+    h.update(CITES_DOMAIN);
+    for (k, id) in cited {
+        h.update([*k]);
+        h.update(id);
+    }
+    h.finalize().into()
+}
+
+/// Records by kind and identity, in ascending order.
+pub type Cited = BTreeSet<(u8, [u8; 32])>;
+
+// ---------------------------------------------------------------------------------------
+// §3 The evidence
+// ---------------------------------------------------------------------------------------
+
+/// A room as a verification document holds it (§8.1).
+#[derive(Clone, Debug)]
+pub struct RoomInput {
+    pub descriptor: Vec<u8>,
+    pub grants: Vec<Vec<u8>>,
+    pub key_log: Option<String>,
+    pub chains: Vec<Vec<Vec<u8>>>,
+    pub policy: Vec<u8>,
+}
+
+fn hexes(v: &Value) -> Option<Vec<Vec<u8>>> {
+    v.as_array()?.iter().map(|x| unhex(x.as_str()?)).collect()
+}
+
+fn has_exactly(o: &Map<String, Value>, keys: &[&str]) -> bool {
+    o.len() == keys.len() && keys.iter().all(|k| o.contains_key(*k))
+}
+
+impl RoomInput {
+    /// A room's object (§8.1), or `None` when it does not read.
+    pub fn from_json(v: &Value) -> Option<RoomInput> {
+        let o = v.as_object()?;
+        if !has_exactly(o, &["descriptor", "grants", "key_log", "chains", "policy"]) {
+            return None;
+        }
+        let key_log = match &o["key_log"] {
+            Value::Null => None,
+            Value::String(s) => Some(s.clone()),
+            _ => return None,
+        };
+        Some(RoomInput {
+            descriptor: unhex(o["descriptor"].as_str()?)?,
+            grants: hexes(&o["grants"])?,
+            key_log,
+            chains: o["chains"].as_array()?.iter().map(hexes).collect::<Option<_>>()?,
+            policy: unhex(o["policy"].as_str()?)?,
+        })
+    }
+
+    pub fn to_json(&self) -> Value {
+        json!({
+            "descriptor": hex(&self.descriptor),
+            "grants": self.grants.iter().map(|g| hex(g)).collect::<Vec<_>>(),
+            "key_log": self.key_log,
+            "chains": self.chains.iter().map(|c| c.iter().map(|e| hex(e)).collect::<Vec<_>>()).collect::<Vec<_>>(),
+            "policy": hex(&self.policy),
+        })
+    }
+}
+
+/// A room verified (§3.3): its id, `t0`, policy and schedule, and its events by digest.
+#[derive(Clone, Debug)]
+pub struct Room {
+    pub id: [u8; 32],
+    pub t0_us: u64,
+    pub policy: ads::AdPolicy,
+    pub schedule: ads::Schedule,
+    pub events: BTreeMap<[u8; 32], Event>,
+}
+
+/// The place of a live-ads refusal, as the receipt ledger writes it.
+fn ads_place(at: &ads::At) -> Value {
+    use room::At as R;
+    match at {
+        ads::At::Room(R::Descriptor) => json!(["room", "descriptor"]),
+        ads::At::Room(R::KeyLog) => json!(["room", "key_log"]),
+        ads::At::Room(R::Grant(i)) => json!(["room", "grant", i]),
+        ads::At::Room(R::Record { chain, record }) => json!(["room", "record", chain, record]),
+        ads::At::Policy => json!(["policy"]),
+        ads::At::Record { chain, record } => json!(["record", chain, record]),
+        ads::At::Receipt(k) => json!(["receipt", k]),
+    }
+}
+
+/// §8.2 step 5 for one room: verified as live-ads §9.2 steps 1 to 3 verify one, no receipts.
+pub fn verify_room(r: &RoomInput) -> Result<Room, Refusal> {
+    let run = ads::verify(&ads::Input {
+        descriptor: &r.descriptor,
+        grants: &r.grants,
+        head: r.key_log.as_deref(),
+        chains: &r.chains,
+        policy: &r.policy,
+        pt0_ms: 0,
+        receipts: &[],
+        pods: &[],
+        claims: &[],
+        creatives: &[],
+        issuers: &[],
+    });
+    match run.outcome() {
+        ads::Outcome::Accept => {}
+        ads::Outcome::Gap(_) => return Err((DELIVERY_GAP, json!([]))),
+        ads::Outcome::Refuse { at, reason } => return Err((reason.code(), ads_place(at))),
+    }
+    let mut ev = BTreeMap::new();
+    for c in &r.chains {
+        for b in c {
+            let e = Event::parse(b).expect("an event the room accepted reads");
+            ev.insert(e.digest(), e);
+        }
+    }
+    Ok(Room { id: run.room.expect("an accepted run names its room"), t0_us: run.t0_us, policy: run.policy.clone().expect("an accepted run holds its policy"), schedule: run.schedule.clone(), events: ev })
+}
+
+/// §8.2 steps 1 and 2: the contract in force, and none of the others overlapping it.
+fn the_contract(contract: &[u8], contracts: &[Vec<u8>]) -> Result<Contract, Refusal> {
+    let c = Contract::parse(contract).map_err(|(r, at)| (r, place(json!(["contract"]), at)))?;
+    let d = c.digest();
+    for (k, b) in contracts.iter().enumerate() {
+        let o = Contract::parse(b).map_err(|(r, at)| (r, place(json!(["contracts", k]), at)))?;
+        if o.digest() != d && o.overlaps(&c) {
+            return Err(("contract_overlap", json!(["contracts", k])));
+        }
+    }
+    Ok(c)
+}
+
+// ---------------------------------------------------------------------------------------
+// §4, §5, §6 Breaks
+// ---------------------------------------------------------------------------------------
+
+/// A break of a report (§4), attributed (§6).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Break {
+    pub class: u8,
+    /// A cued break: its room's index in the document, and its index in that room's schedule.
+    pub room: Option<(usize, usize)>,
+    /// A scheduled break: its run's index in the document, and its entry's.
+    pub taken: Option<(usize, usize)>,
+    pub opening: Option<[u8; 32]>,
+    pub closing: Option<[u8; 32]>,
+    pub start: u64,
+    pub duration_ms: u64,
+    pub open: bool,
+    pub slots: Option<u64>,
+    /// `section` or `policy`, when it has slots.
+    pub slot_source: Option<&'static str>,
+    /// The policy's digest, when its slots are the policy's.
+    pub policy: Option<[u8; 32]>,
+    pub section: Option<section::States>,
+    /// Its run's identity, and its entry's index in that run's schedule.
+    pub run: [u8; 32],
+    pub entry: u64,
+    pub asset: Option<String>,
+    pub split: u16,
+}
+
+impl Break {
+    /// Every record a line citing it cites (§7.3).
+    pub fn cited(&self) -> Vec<(u8, [u8; 32])> {
+        let mut v: Vec<(u8, [u8; 32])> = self.opening.iter().chain(self.closing.iter()).map(|d| (record_kind::CUE, *d)).collect();
+        v.extend(self.policy.map(|p| (record_kind::POLICY, p)));
+        v.push((record_kind::RUN, self.run));
+        v
+    }
+}
+
+/// What a report rests on (§8.2 steps 4 to 7).
+#[derive(Clone, Debug)]
+pub struct Evidence {
+    pub runs: Vec<ChannelReceipt>,
+    /// The runs' identities, in the document's order.
+    pub run_ids: Vec<[u8; 32]>,
+    pub rooms: Vec<Room>,
+    /// The breaks in the period, in the order of steps 6 and 7.
+    pub breaks: Vec<Break>,
+}
+
+fn us(ms: u64) -> u128 {
+    ms as u128 * 1000
+}
+
+/// §8.2 step 5: the rooms.
+fn the_rooms(c: &Contract, rooms: &[Value]) -> Result<Vec<Room>, Refusal> {
+    let mut out: Vec<Room> = Vec::with_capacity(rooms.len());
+    for (k, v) in rooms.iter().enumerate() {
+        let at = || json!(["room", k]);
+        let input = RoomInput::from_json(v).ok_or((MALFORMED, at()))?;
+        let r = verify_room(&input).map_err(|(reason, w)| (reason, place(at(), w)))?;
+        if !c.carries(share::carrier::ROOM, &r.id) {
+            return Err((Reason::RoomForeign.code(), at()));
+        }
+        if out.iter().any(|o| o.id == r.id) {
+            return Err((Reason::RoomRepeated.code(), at()));
+        }
+        out.push(r);
+    }
+    Ok(out)
+}
+
+/// §5.3: a section against its opening cue's summary.
+fn agrees(st: &section::States, cue: &events::Cue) -> bool {
+    if let Some((cancel, out)) = st.insert
+        && (cancel || !out)
+    {
+        return false;
+    }
+    if st.id.is_some_and(|id| id != cue.cue_id) {
+        return false;
+    }
+    st.duration.is_none_or(|d| d / 90 == cue.duration_ms as u64)
+}
+
+/// Where a break is attributed (§6): its run's identity, its entry, its asset and its split.
+type Placed = ([u8; 32], u64, Option<String>, u16);
+
+/// §6: the run and entry of an instant, the asset and the split; `None` is `outside_window`.
+fn placed(c: &Contract, runs: &[ChannelReceipt], ids: &[[u8; 32]], t: u64) -> Option<Result<Placed, &'static str>> {
+    let r = runs.iter().position(|r| us(r.window_start_ms) <= t as u128 && (t as u128) < us(r.window_end_ms))?;
+    let sched = &runs[r].schedule;
+    let e = sched.iter().position(|x| us(x.start_ms) <= t as u128 && (t as u128) < us(x.start_ms) + us(x.duration_ms))?;
+    Some(attributed(c, &runs[r], ids[r], e))
+}
+
+/// §6: the asset an entry gives, and its split.
+fn attributed(c: &Contract, run: &ChannelReceipt, id: [u8; 32], e: usize) -> Result<Placed, &'static str> {
+    let asset = share::asset_at(&run.schedule, e, c.rule).map(str::to_string);
+    let split = match &asset {
+        Some(a) => c.split_of(a.as_bytes()).ok_or(ASSET_UNMAPPED)?,
+        None => c.between,
+    };
+    Ok((id, e as u64, asset, split))
+}
+
+/// §8.2 steps 6 and 7: the breaks in the period, placed and attributed.
+fn the_breaks(c: &Contract, start: u64, end: u64, runs: &[ChannelReceipt], ids: &[[u8; 32]], rooms: &[Room]) -> Result<Vec<Break>, Refusal> {
+    let mut out: Vec<Break> = Vec::new();
+    // Every cued break's start, in the period or not, for §4.2's cued test.
+    let mut starts: Vec<u64> = Vec::new();
+    for (k, room) in rooms.iter().enumerate() {
+        let policy_digest = room.policy.digest();
+        let mut mine: Vec<Break> = Vec::new();
+        for (i, b) in room.schedule.breaks.iter().enumerate() {
+            let at = || json!(["room", k, "break", i]);
+            let Some(s) = room.t0_us.checked_add(b.t) else { continue };
+            starts.push(s);
+            if !(start <= s && s < end) {
+                continue;
+            }
+            let cue = match room.events.get(&b.digest).map(|e| events::parse_payload(kind::CUE, &e.payload, u16::MAX)) {
+                Some(Ok(Payload::Cue(q))) => q,
+                _ => unreachable!("a break's opening cue is a cue the room accepted"),
+            };
+            let st = match &cue.scte {
+                Some((events::scte_form::SPLICE_INFO_SECTION, bytes)) => {
+                    let st = section::read(bytes).map_err(|_| (Reason::CueSectionInvalid.code(), at()))?;
+                    if !agrees(&st, &cue) {
+                        return Err((Reason::CueSectionMismatch.code(), at()));
+                    }
+                    Some(st)
+                }
+                _ => None,
+            };
+            let duration_ms = b.duration_ms.unwrap_or(b.avail_ms);
+            let span = |x: &Break| (x.start as u128, x.start as u128 + us(x.duration_ms));
+            let mine_span = (s as u128, s as u128 + us(duration_ms));
+            if out.iter().any(|o| {
+                let (a, z) = span(o);
+                a < mine_span.1 && mine_span.0 < z
+            }) {
+                return Err((BREAK_OVERLAP, at()));
+            }
+            let (run, entry, asset, split) = placed(c, runs, ids, s).ok_or((OUTSIDE_WINDOW, at()))?.map_err(|r| (r, at()))?;
+            let (slots, slot_source, policy) = match st.as_ref().and_then(|x| x.slots) {
+                Some(n) => (Some(n), Some("section"), None),
+                None => (Some(room.policy.slots as u64), Some("policy"), Some(policy_digest)),
+            };
+            mine.push(Break {
+                class: class::CUED,
+                room: Some((k, i)),
+                taken: None,
+                opening: Some(b.digest),
+                closing: b.closed_by,
+                start: s,
+                duration_ms,
+                open: b.is_open(),
+                slots,
+                slot_source,
+                policy,
+                section: st,
+                run,
+                entry,
+                asset,
+                split,
+            });
+        }
+        out.extend(mine);
+    }
+    // The scheduled breaks, the runs by their windows' starts.
+    let mut order: Vec<usize> = (0..runs.len()).collect();
+    order.sort_by_key(|&k| runs[k].window_start_ms);
+    let mut seen: BTreeSet<(String, u64, u64)> = BTreeSet::new();
+    for k in order {
+        let r = &runs[k];
+        for &e in &r.aired {
+            let e = e as usize;
+            let x = &r.schedule[e];
+            if x.kind != EntryKind::Ad || !seen.insert((x.asset_id.clone(), x.start_ms, x.duration_ms)) {
+                continue;
+            }
+            let s = us(x.start_ms);
+            let z = s + us(x.duration_ms);
+            if starts.iter().any(|&t| s <= t as u128 && (t as u128) < z) || !(start as u128 <= s && s < end as u128) {
+                continue;
+            }
+            let (run, entry, asset, split) = attributed(c, r, ids[k], e).map_err(|reason| (reason, json!(["run", k, "entry", e])))?;
+            out.push(Break {
+                class: class::SCHEDULED,
+                room: None,
+                taken: Some((k, e)),
+                opening: None,
+                closing: None,
+                start: s as u64,
+                duration_ms: x.duration_ms,
+                open: false,
+                slots: None,
+                slot_source: None,
+                policy: None,
+                section: None,
+                run,
+                entry,
+                asset,
+                split,
+            });
+        }
+    }
+    Ok(out)
+}
+
+/// §8.2 steps 4 to 7 for a contract and a period.
+fn evidence(c: &Contract, start: u64, end: u64, runs: &[Value], rooms: &[Value]) -> Result<Evidence, Refusal> {
+    let runs = share::the_runs(c, runs)?;
+    let run_ids: Vec<[u8; 32]> = runs.iter().map(ChannelReceipt::receipt_hash).collect();
+    let rooms = the_rooms(c, rooms)?;
+    let breaks = the_breaks(c, start, end, &runs, &run_ids, &rooms)?;
+    Ok(Evidence { runs, run_ids, rooms, breaks })
+}
+
+// ---------------------------------------------------------------------------------------
+// §7.2, §7.3 The lines
+// ---------------------------------------------------------------------------------------
+
+#[derive(Clone, Debug, Default)]
+struct Group {
+    breaks: u64,
+    break_ms: u128,
+    slots: u128,
+    unslotted: u64,
+    cited: Cited,
+}
+
+fn groups(bs: &[Break]) -> BTreeMap<(u16, u8), Group> {
+    let mut g: BTreeMap<(u16, u8), Group> = BTreeMap::new();
+    for b in bs {
+        let e = g.entry((b.split, b.class)).or_default();
+        e.breaks += 1;
+        e.break_ms += b.duration_ms as u128;
+        match b.slots {
+            Some(n) => e.slots += n as u128,
+            None => e.unslotted += 1,
+        }
+        e.cited.extend(b.cited());
+    }
+    g
+}
+
+/// A figure that cannot be held in its field.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Overflow;
+
+/// A party's lines, each with its cited records, and the totals (§7.2, §7.3).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Computed {
+    pub lines: Vec<(Line, Cited)>,
+    pub breaks: u64,
+    pub break_ms: u64,
+    pub slots: u64,
+}
+
+/// The party's share of a split, when it holds one.
+fn share_of(c: &Contract, party: &[u8; 32], split: u16) -> Option<u32> {
+    c.parties(split).into_iter().find(|(k, _)| k == party).map(|(_, p)| p)
+}
+
+/// The lines of `party`'s report over the breaks (§7.2, §7.3).
+pub fn compute(c: &Contract, party: &[u8; 32], bs: &[Break]) -> Result<Computed, Overflow> {
+    let mut lines = Vec::new();
+    let (mut breaks, mut break_ms, mut slots) = (0u64, 0u64, 0u64);
+    for ((split, cls), g) in groups(bs) {
+        let Some(ppm) = share_of(c, party, split) else { continue };
+        let line = Line {
+            split,
+            class: cls,
+            breaks: g.breaks,
+            break_ms: u64::try_from(g.break_ms).map_err(|_| Overflow)?,
+            slots: u64::try_from(g.slots).map_err(|_| Overflow)?,
+            unslotted: g.unslotted,
+            ppm,
+            cited: u32::try_from(g.cited.len()).map_err(|_| Overflow)?,
+            cites: cites_digest(&g.cited),
+        };
+        breaks = breaks.checked_add(line.breaks).ok_or(Overflow)?;
+        break_ms = break_ms.checked_add(line.break_ms).ok_or(Overflow)?;
+        slots = slots.checked_add(line.slots).ok_or(Overflow)?;
+        lines.push((line, g.cited));
+    }
+    Ok(Computed { lines, breaks, break_ms, slots })
+}
+
+/// §8.2 step 8: the report's figures against those recomputed.
+fn check_figures(rep: &Report, c: &Contract, ev: &Evidence) -> Result<Computed, &'static str> {
+    let g = groups(&ev.breaks);
+    for l in &rep.lines {
+        let holds = share_of(c, &rep.party, l.split).is_some();
+        match g.get(&l.key()) {
+            Some(x) if holds && l.breaks <= x.breaks => {}
+            _ => return Err(LINE_UNSOURCED),
+        }
+    }
+    let mismatch = Reason::OpportunityReportMismatch.code();
+    let computed = compute(c, &rep.party, &ev.breaks).map_err(|_| mismatch)?;
+    for l in &rep.lines {
+        let Some((x, _)) = computed.lines.iter().find(|(x, _)| x.key() == l.key()) else {
+            return Err(LINE_UNSOURCED);
+        };
+        if l.cited != x.cited || l.cites != x.cites {
+            return Err(CITATION_MISMATCH);
+        }
+    }
+    let mut rooms: Vec<[u8; 32]> = ev.rooms.iter().map(|r| r.id).collect();
+    rooms.sort();
+    let mut runs = ev.run_ids.clone();
+    runs.sort();
+    let lines: Vec<Line> = computed.lines.iter().map(|(l, _)| *l).collect();
+    if rep.rooms != rooms || rep.runs != runs || rep.lines != lines || (rep.breaks, rep.break_ms, rep.slots) != (computed.breaks, computed.break_ms, computed.slots) {
+        return Err(mismatch);
+    }
+    Ok(computed)
+}
+
+// ---------------------------------------------------------------------------------------
+// §8 Verifying a report
+// ---------------------------------------------------------------------------------------
+
+/// What a report's verification document holds (§8.1), its members read.
+struct Parts<'a> {
+    contract: Vec<u8>,
+    contracts: Vec<Vec<u8>>,
+    report: Option<Vec<u8>>,
+    runs: &'a [Value],
+    rooms: &'a [Value],
+}
+
+fn parts(doc: &Value, with_report: bool) -> Result<Parts<'_>, Refusal> {
+    let bad = || (MALFORMED, json!([]));
+    let o = doc.as_object().ok_or_else(bad)?;
+    let want: &[&str] = if with_report { &["contract", "contracts", "report", "runs", "rooms"] } else { &["contract", "contracts", "runs", "rooms"] };
+    if !has_exactly(o, want) {
+        return Err(bad());
+    }
+    let bytes = |v: &Value| v.as_str().and_then(unhex);
+    Ok(Parts {
+        contract: bytes(&o["contract"]).ok_or_else(bad)?,
+        contracts: o["contracts"].as_array().ok_or_else(bad)?.iter().map(bytes).collect::<Option<Vec<_>>>().ok_or_else(bad)?,
+        report: if with_report { Some(bytes(&o["report"]).ok_or_else(bad)?) } else { None },
+        runs: o["runs"].as_array().ok_or_else(bad)?,
+        rooms: o["rooms"].as_array().ok_or_else(bad)?,
+    })
+}
+
+/// An accepted report (§8.3).
+#[derive(Clone, Debug)]
+pub struct Accepted {
+    pub digest: [u8; 32],
+    pub contract: Contract,
+    pub report: Report,
+    pub evidence: Evidence,
+    pub computed: Computed,
+}
+
+impl Accepted {
+    /// The breaks counted in a line of the party's (§10.3).
+    pub fn counted(&self) -> impl Iterator<Item = &Break> {
+        self.evidence.breaks.iter().filter(|b| share_of(&self.contract, &self.report.party, b.split).is_some())
+    }
+}
+
+/// §8.2: verify a report's verification document (§8.1).
+pub fn verify(doc: &Value) -> Result<Accepted, Refusal> {
+    let p = parts(doc, true)?;
+    let c = the_contract(&p.contract, &p.contracts)?;
+    let at = || json!(["report"]);
+    let rep = Report::read(p.report.as_deref().expect("with its report")).map_err(|r| (r, at()))?;
+    if rep.contract != c.digest() || !c.is_party(&rep.party) {
+        return Err((CONTRACT_MISMATCH, at()));
+    }
+    if !(c.start <= rep.start && rep.end <= c.end) {
+        return Err((OUTSIDE_CONTRACT, at()));
+    }
+    check_sig(&rep.issuer, REPORT_DOMAIN, &rep.body(), &rep.sig).map_err(|r| (r, at()))?;
+    let ev = evidence(&c, rep.start, rep.end, p.runs, p.rooms)?;
+    let computed = check_figures(&rep, &c, &ev).map_err(|r| (r, at()))?;
+    Ok(Accepted { digest: rep.digest(), contract: c, report: rep, evidence: ev, computed })
+}
+
+/// Compute and sign the report of `party` for `[start, end)` over a verification document
+/// without its report (§8.1), and return it with the full document, verified.
+pub fn create(inputs: &Value, issuer: &SigningKey, party: [u8; 32], start: u64, end: u64) -> Result<(Report, Value), Refusal> {
+    let p = parts(inputs, false)?;
+    let c = the_contract(&p.contract, &p.contracts)?;
+    let at = || json!(["report"]);
+    if !c.is_party(&party) {
+        return Err((CONTRACT_MISMATCH, at()));
+    }
+    if start >= end {
+        return Err((Reason::OpportunityReportInvalid.code(), at()));
+    }
+    if !(c.start <= start && end <= c.end) {
+        return Err((OUTSIDE_CONTRACT, at()));
+    }
+    let ev = evidence(&c, start, end, p.runs, p.rooms)?;
+    let computed = compute(&c, &party, &ev.breaks).map_err(|_| (Reason::OpportunityReportMismatch.code(), at()))?;
+    let mut rooms: Vec<[u8; 32]> = ev.rooms.iter().map(|r| r.id).collect();
+    rooms.sort();
+    let mut runs = ev.run_ids.clone();
+    runs.sort();
+    let rep = Report {
+        issuer: [0; 32],
+        contract: c.digest(),
+        party,
+        start,
+        end,
+        rooms,
+        runs,
+        lines: computed.lines.iter().map(|(l, _)| *l).collect(),
+        breaks: computed.breaks,
+        break_ms: computed.break_ms,
+        slots: computed.slots,
+        sig: [0; 64],
+    }
+    .sign(issuer);
+    let mut doc = inputs.clone();
+    doc["report"] = json!(hex(&rep.to_bytes()));
+    verify(&doc)?;
+    Ok((rep, doc))
+}
+
+fn records_json(r: &[(u8, [u8; 32])]) -> Value {
+    Value::Array(r.iter().map(|(k, id)| json!([k, hex(id)])).collect())
+}
+
+fn section_json(s: &Option<section::States>) -> Value {
+    match s {
+        None => Value::Null,
+        Some(s) => json!({"command": s.command_name(), "id": s.id, "duration": s.duration, "slots": s.slots}),
+    }
+}
+
+/// What §8.3 states of an accepted report.
+pub fn accepted_json(a: &Accepted) -> Value {
+    let r = &a.report;
+    let breaks: Vec<Value> = a
+        .evidence
+        .breaks
+        .iter()
+        .map(|b| {
+            json!({
+                "class": class::name(b.class),
+                "room": b.room.map(|x| x.0), "index": b.room.map(|x| x.1),
+                "taken": b.taken.map(|(k, e)| json!({"run": k, "entry": e})),
+                "cue": b.opening.map(|d| hex(&d)),
+                "start": b.start, "duration_ms": b.duration_ms, "open": b.open,
+                "slots": b.slots, "slots_from": b.slot_source,
+                "section": section_json(&b.section),
+                "run": hex(&b.run), "entry": b.entry, "asset": b.asset, "split": b.split,
+                "cites": records_json(&b.cited().into_iter().collect::<BTreeSet<_>>().into_iter().collect::<Vec<_>>()),
+            })
+        })
+        .collect();
+    let lines: Vec<Value> = a
+        .computed
+        .lines
+        .iter()
+        .map(|(l, cited)| {
+            json!({
+                "split": l.split, "class": class::name(l.class), "breaks": l.breaks, "break_ms": l.break_ms, "slots": l.slots,
+                "unslotted": l.unslotted, "ppm": l.ppm, "cites": records_json(&cited.iter().copied().collect::<Vec<_>>()),
+            })
+        })
+        .collect();
+    json!({
+        "outcome": "accept",
+        "report": hex(&a.digest),
+        "contract": hex(&r.contract),
+        "issuer": hex(&r.issuer),
+        "party": hex(&r.party),
+        "role": if r.party == a.contract.operator { "operator" } else { "owner" },
+        "start": r.start,
+        "end": r.end,
+        "rooms": r.rooms.iter().map(|d| hex(d)).collect::<Vec<_>>(),
+        "runs": r.runs.iter().map(|d| hex(d)).collect::<Vec<_>>(),
+        "breaks": breaks,
+        "lines": lines,
+        "totals": {"breaks": r.breaks, "break_ms": r.break_ms, "slots": r.slots},
+    })
+}
+
+// ---------------------------------------------------------------------------------------
+// §10 The statement check
+// ---------------------------------------------------------------------------------------
+
+/// A check's line (§10.2).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct CheckLine {
+    pub scope: u8,
+    pub key: Vec<u8>,
+    pub breaks: u64,
+    pub break_ms: u64,
+    pub slots: u64,
+    pub unslotted: u64,
+    pub impressions: u64,
+    pub revenue: u64,
+    pub fill_ppm: u64,
+    pub revenue_per_slot: u64,
+    /// (`signed_impressions`, `signed_revenue`).
+    pub signed: Option<(u64, u64)>,
+    pub flags: u8,
+}
+
+/// A statement check (§10.1).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Check {
+    pub issuer: [u8; 32],
+    pub report: [u8; 32],
+    pub reported: [u8; 32],
+    pub form: u8,
+    pub statement: [u8; 32],
+    pub floor_ppm: u32,
+    pub ceiling_ppm: u32,
+    pub lines: Vec<CheckLine>,
+    pub sig: [u8; 64],
+}
+
+impl Check {
+    pub fn body(&self) -> Vec<u8> {
+        let mut o = Vec::with_capacity(200 + 90 * self.lines.len());
+        o.extend_from_slice(&CHECK_MAGIC);
+        o.push(VERSION);
+        o.extend_from_slice(&self.issuer);
+        o.extend_from_slice(&self.report);
+        o.extend_from_slice(&self.reported);
+        o.push(self.form);
+        o.extend_from_slice(&self.statement);
+        o.extend_from_slice(&self.floor_ppm.to_le_bytes());
+        o.extend_from_slice(&self.ceiling_ppm.to_le_bytes());
+        o.extend_from_slice(&u16::try_from(self.lines.len()).expect("at most 65535 lines").to_le_bytes());
+        for l in &self.lines {
+            o.push(l.scope);
+            o.extend_from_slice(&u16::try_from(l.key.len()).expect("a key of at most 65535 bytes").to_le_bytes());
+            o.extend_from_slice(&l.key);
+            for v in [l.breaks, l.break_ms, l.slots, l.unslotted, l.impressions, l.revenue, l.fill_ppm, l.revenue_per_slot] {
+                o.extend_from_slice(&v.to_le_bytes());
+            }
+            match l.signed {
+                Some((i, r)) => {
+                    o.push(1);
+                    o.extend_from_slice(&i.to_le_bytes());
+                    o.extend_from_slice(&r.to_le_bytes());
+                }
+                None => o.push(0),
+            }
+            o.push(l.flags);
+        }
+        o
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let mut o = self.body();
+        o.extend_from_slice(&self.sig);
+        o
+    }
+
+    /// Its digest (§10.5).
+    pub fn digest(&self) -> [u8; 32] {
+        sha256(&[&self.body()])
+    }
+
+    /// Signed by its issuer (§10.5), whose key it names.
+    pub fn sign(mut self, issuer: &SigningKey) -> Check {
+        self.issuer = issuer.verifying_key().to_bytes();
+        self.sig = sign(issuer, CHECK_DOMAIN, &self.body());
+        self
+    }
+
+    /// Read a check and hold it to its rules (§10.6).
+    pub fn read(b: &[u8]) -> Result<Check, &'static str> {
+        read_head(b, &CHECK_MAGIC)?;
+        let mut r = Rd { b, p: 5 };
+        let (issuer, report, reported) = (r.arr()?, r.arr()?, r.arr()?);
+        let form_ = r.u8()?;
+        let statement = r.arr()?;
+        let (floor_ppm, ceiling_ppm) = (r.u32()?, r.u32()?);
+        let n = r.u16()? as usize;
+        let mut lines = Vec::with_capacity(n);
+        for _ in 0..n {
+            let scope = r.u8()?;
+            let key = r.text()?;
+            let mut f = [0u64; 8];
+            for x in &mut f {
+                *x = r.u64()?;
+            }
+            let signed = match r.u8()? {
+                0 => None,
+                1 => Some((r.u64()?, r.u64()?)),
+                _ => return Err(Reason::StatementCheckInvalid.code()),
+            };
+            let flags = r.u8()?;
+            let [breaks, break_ms, slots, unslotted, impressions, revenue, fill_ppm, revenue_per_slot] = f;
+            lines.push(CheckLine { scope, key, breaks, break_ms, slots, unslotted, impressions, revenue, fill_ppm, revenue_per_slot, signed, flags });
+        }
+        let sig = r.arr()?;
+        if !r.done() {
+            return Err(MALFORMED);
+        }
+        let ch = Check { issuer, report, reported, form: form_, statement, floor_ppm, ceiling_ppm, lines, sig };
+        if !ch.rules_hold() {
+            return Err(Reason::StatementCheckInvalid.code());
+        }
+        Ok(ch)
+    }
+
+    fn rules_hold(&self) -> bool {
+        let keys: Vec<(u8, &[u8])> = self.lines.iter().map(|l| (l.scope, l.key.as_slice())).collect();
+        let key_ok = |l: &CheckLine| match l.scope {
+            scope::PERIOD => l.key.is_empty(),
+            scope::DAY => std::str::from_utf8(&l.key).ok().and_then(reported::day_start).is_some(),
+            scope::PROGRAMME => (1..=1024).contains(&l.key.len()) && std::str::from_utf8(&l.key).is_ok(),
+            _ => false,
+        };
+        self.issuer != [0; 32]
+            && (form::JSON..=form::CSV).contains(&self.form)
+            && self.floor_ppm <= WHOLE
+            && self.ceiling_ppm >= WHOLE
+            && self.lines.first().is_some_and(|l| l.scope == scope::PERIOD)
+            && self.lines.iter().filter(|l| l.scope == scope::PERIOD).count() == 1
+            && ascending(&keys)
+            && self.lines.iter().all(|l| key_ok(l) && (l.signed.is_none() || l.scope == scope::PERIOD) && l.flags < 0x80)
+    }
+}
+
+/// ⌊a × m / b⌋ in integers wide enough, held at 2^64 − 1; 0 when `b` is 0 (§10.3).
+fn ratio(a: u64, m: u128, b: u64) -> u64 {
+    if b == 0 {
+        return 0;
+    }
+    u64::try_from(a as u128 * m / b as u128).unwrap_or(u64::MAX)
+}
+
+/// The opportunities of a scope: count, `break_ms`, slots, unslotted (§10.3).
+fn tally<'a>(bs: impl Iterator<Item = &'a Break>) -> (u64, u64, u64, u64) {
+    let (mut n, mut ms, mut slots, mut un) = (0u64, 0u128, 0u128, 0u64);
+    for b in bs {
+        n += 1;
+        ms += b.duration_ms as u128;
+        match b.slots {
+            Some(s) => slots += s as u128,
+            None => un += 1,
+        }
+    }
+    let hold = |x: u128| u64::try_from(x).unwrap_or(u64::MAX);
+    (n, hold(ms), hold(slots), un)
+}
+
+/// The signed figures beside a check (§10.4): (`signed_impressions`, `signed_revenue`).
+pub fn signed_figures(s: &share::Accepted, basis_: u8) -> (u64, u64) {
+    let sum = |f: fn(&share::Line) -> u64| s.statement.lines.iter().fold(0u64, |a, l| a.saturating_add(f(l)));
+    let impressions = sum(|l| l.impressions);
+    let revenue = if basis_ == basis::GROSS { sum(|l| l.revenue) } else { s.statement.total };
+    (impressions, revenue)
+}
+
+/// A check's lines (§10.2 to §10.4) for a report, a reported statement, the signed figures when
+/// given, and the bounds.
+pub fn check_lines(a: &Accepted, r: &Reported, signed: Option<(u64, u64)>, floor_ppm: u32, ceiling_ppm: u32) -> Vec<CheckLine> {
+    let counted: Vec<&Break> = a.counted().collect();
+    let line = |scope_: u8, key: Vec<u8>, t: (u64, u64, u64, u64), impressions: u64, revenue: u64, signed: Option<(u64, u64)>| {
+        let (breaks, break_ms, slots, unslotted) = t;
+        CheckLine {
+            scope: scope_,
+            key,
+            breaks,
+            break_ms,
+            slots,
+            unslotted,
+            impressions,
+            revenue,
+            fill_ppm: ratio(impressions, WHOLE as u128, slots),
+            revenue_per_slot: ratio(revenue, 1, slots),
+            signed,
+            flags: 0,
+        }
+    };
+    let mut lines = vec![line(scope::PERIOD, Vec::new(), tally(counted.iter().copied()), r.impressions, r.revenue, signed)];
+    for d in &r.days {
+        let end = d.start + reported::DAY_US;
+        lines.push(line(scope::DAY, d.day.as_bytes().to_vec(), tally(counted.iter().copied().filter(|b| d.start <= b.start && b.start < end)), d.impressions, d.revenue, None));
+    }
+    for p in &r.programmes {
+        lines.push(line(scope::PROGRAMME, p.asset.clone(), tally(counted.iter().copied().filter(|b| b.asset.as_deref().map(str::as_bytes) == Some(p.asset.as_slice()))), p.impressions, p.revenue, None));
+    }
+    let (rate, period_slots) = (lines[0].fill_ppm as u128, lines[0].slots);
+    for l in &mut lines {
+        let mut f = 0u8;
+        if l.impressions > 0 && l.breaks == 0 {
+            f |= 1 << 0;
+        }
+        if l.scope != scope::PERIOD && l.slots > 0 && period_slots > 0 {
+            let fill = l.fill_ppm as u128 * WHOLE as u128;
+            if fill > rate * ceiling_ppm as u128 {
+                f |= 1 << 1;
+            }
+            if fill < rate * floor_ppm as u128 {
+                f |= 1 << 2;
+            }
+        }
+        if let Some((si, sr)) = l.signed {
+            if l.impressions > si {
+                f |= 1 << 3;
+            }
+            if l.impressions < si {
+                f |= 1 << 4;
+            }
+            if l.revenue > sr {
+                f |= 1 << 5;
+            }
+            if l.revenue < sr {
+                f |= 1 << 6;
+            }
+        }
+        l.flags = f;
+    }
+    lines
+}
+
+// ---------------------------------------------------------------------------------------
+// §11 Verifying a check
+// ---------------------------------------------------------------------------------------
+
+/// An accepted check (§11.3).
+#[derive(Clone, Debug)]
+pub struct CheckAccepted {
+    pub digest: [u8; 32],
+    pub check: Check,
+    pub report: Accepted,
+    pub reported: Reported,
+    pub statement: Option<share::Accepted>,
+}
+
+/// What a check's document holds after steps 1 to 3 (§11.2).
+struct Held {
+    report: Accepted,
+    reported: Reported,
+    reported_digest: [u8; 32],
+    form: u8,
+    statement: Option<share::Accepted>,
+}
+
+fn held(doc: &Value, with_check: bool) -> Result<(Held, Option<Vec<u8>>), Refusal> {
+    let bad = || (MALFORMED, json!([]));
+    let o = doc.as_object().ok_or_else(bad)?;
+    let want: &[&str] = if with_check { &["report", "reported", "statement", "check"] } else { &["report", "reported", "statement"] };
+    if !has_exactly(o, want) {
+        return Err(bad());
+    }
+    let rp = o["reported"].as_object().filter(|r| has_exactly(r, &["form", "text"])).ok_or_else(bad)?;
+    let form_ = rp["form"].as_str().and_then(form::code).ok_or_else(bad)?;
+    let text = rp["text"].as_str().ok_or_else(bad)?;
+    let check = if with_check { Some(o["check"].as_str().and_then(unhex).ok_or_else(bad)?) } else { None };
+    if !(o["statement"].is_null() || o["statement"].is_object()) {
+        return Err(bad());
+    }
+    // Step 1.
+    let report = verify(&o["report"]).map_err(|(r, at)| (r, place(json!(["report"]), at)))?;
+    // Step 2.
+    let at = || json!(["reported"]);
+    let reported = reported::read(form_, text).ok_or((Reason::ReportedInvalid.code(), at()))?;
+    let c = &report.contract;
+    if reported.channel != c.channel || reported.currency != c.currency || (reported.start, reported.end) != (report.report.start, report.report.end) {
+        return Err((Reason::ReportedForeign.code(), at()));
+    }
+    // Step 3.
+    let statement = match &o["statement"] {
+        Value::Null => None,
+        s => {
+            let a = share::verify(s).map_err(|(r, at)| (r, place(json!(["statement"]), at)))?;
+            let st = &a.statement;
+            if st.contract != report.report.contract || st.party != report.report.party || (st.start, st.end) != (report.report.start, report.report.end) {
+                return Err((Reason::StatementForeign.code(), json!(["statement"])));
+            }
+            Some(a)
+        }
+    };
+    Ok((Held { report, reported, reported_digest: sha256(&[text.as_bytes()]), form: form_, statement }, check))
+}
+
+/// §11.2: verify a check's verification document (§11.1).
+pub fn verify_check(doc: &Value) -> Result<CheckAccepted, Refusal> {
+    let (h, check) = held(doc, true)?;
+    let at = || json!(["check"]);
+    let ch = Check::read(&check.expect("with its check")).map_err(|r| (r, at()))?;
+    check_sig(&ch.issuer, CHECK_DOMAIN, &ch.body(), &ch.sig).map_err(|r| (r, at()))?;
+    let signed = h.statement.as_ref().map(|s| signed_figures(s, h.reported.basis));
+    let statement = h.statement.as_ref().map_or([0; 32], |s| s.digest);
+    let lines = check_lines(&h.report, &h.reported, signed, ch.floor_ppm, ch.ceiling_ppm);
+    if ch.report != h.report.digest || ch.reported != h.reported_digest || ch.form != h.form || ch.statement != statement || ch.lines != lines {
+        return Err((Reason::StatementCheckMismatch.code(), at()));
+    }
+    Ok(CheckAccepted { digest: ch.digest(), check: ch, report: h.report, reported: h.reported, statement: h.statement })
+}
+
+/// Compute and sign the check of a document without its check (§11.1), at the bounds given, and
+/// return it with the full document, verified.
+pub fn create_check(inputs: &Value, issuer: &SigningKey, floor_ppm: u32, ceiling_ppm: u32) -> Result<(Check, Value), Refusal> {
+    let (h, _) = held(inputs, false)?;
+    if floor_ppm > WHOLE || ceiling_ppm < WHOLE {
+        return Err((Reason::StatementCheckInvalid.code(), json!(["check"])));
+    }
+    let signed = h.statement.as_ref().map(|s| signed_figures(s, h.reported.basis));
+    let ch = Check {
+        issuer: [0; 32],
+        report: h.report.digest,
+        reported: h.reported_digest,
+        form: h.form,
+        statement: h.statement.as_ref().map_or([0; 32], |s| s.digest),
+        floor_ppm,
+        ceiling_ppm,
+        lines: check_lines(&h.report, &h.reported, signed, floor_ppm, ceiling_ppm),
+        sig: [0; 64],
+    }
+    .sign(issuer);
+    let mut doc = inputs.clone();
+    doc["check"] = json!(hex(&ch.to_bytes()));
+    verify_check(&doc)?;
+    Ok((ch, doc))
+}
+
+/// The names of a line's flags.
+pub fn flag_names(f: u8) -> Vec<&'static str> {
+    FLAGS.iter().enumerate().filter(|(i, _)| f & (1 << i) != 0).map(|(_, n)| *n).collect()
+}
+
+/// What §11.3 states of an accepted check.
+pub fn check_json(a: &CheckAccepted) -> Value {
+    let c = &a.check;
+    let lines: Vec<Value> = c
+        .lines
+        .iter()
+        .map(|l| {
+            json!({
+                "scope": scope::name(l.scope), "key": String::from_utf8_lossy(&l.key),
+                "breaks": l.breaks, "break_ms": l.break_ms, "slots": l.slots, "unslotted": l.unslotted,
+                "impressions": l.impressions, "revenue": l.revenue, "fill_ppm": l.fill_ppm, "revenue_per_slot": l.revenue_per_slot,
+                "signed": l.signed.map(|(i, r)| json!({"impressions": i, "revenue": r})),
+                "flags": flag_names(l.flags),
+            })
+        })
+        .collect();
+    json!({
+        "outcome": "accept",
+        "check": hex(&a.digest),
+        "issuer": hex(&c.issuer),
+        "report": hex(&c.report),
+        "party": hex(&a.report.report.party),
+        "start": a.report.report.start,
+        "end": a.report.report.end,
+        "reported": hex(&c.reported),
+        "form": form::name(c.form),
+        "basis": basis::name(a.reported.basis),
+        "statement": a.statement.as_ref().map(|s| hex(&s.digest)),
+        "floor_ppm": c.floor_ppm,
+        "ceiling_ppm": c.ceiling_ppm,
+        "lines": lines,
+    })
+}
+
+/// A report's verification's outcome as the corpus states it.
+pub fn outcome_json(r: &Result<Accepted, Refusal>) -> Value {
+    match r {
+        Ok(a) => accepted_json(a),
+        Err((reason, at)) => json!({"outcome": "refuse", "reason": reason, "at": at}),
+    }
+}
+
+/// A check's verification's outcome as the corpus states it.
+pub fn check_outcome_json(r: &Result<CheckAccepted, Refusal>) -> Value {
+    match r {
+        Ok(a) => check_json(a),
+        Err((reason, at)) => json!({"outcome": "refuse", "reason": reason, "at": at}),
+    }
+}
+
+/// Whether a document is a check's (§11.1) rather than a report's (§8.1): it has `reported`.
+pub fn is_check_document(doc: &Value) -> bool {
+    doc.get("reported").is_some()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn ratios_round_down_and_hold() {
+        assert_eq!(ratio(14, WHOLE as u128, 12), 1_166_666);
+        assert_eq!(ratio(5, WHOLE as u128, 0), 0);
+        assert_eq!(ratio(u64::MAX, WHOLE as u128, 1), u64::MAX);
+        assert_eq!(ratio(7, 1, 2), 3);
+    }
+
+    #[test]
+    fn flags_by_name() {
+        assert_eq!(flag_names(0b101_0101), vec!["unproved", "below", "impressions_below_signed", "revenue_below_signed"]);
+        assert!(flag_names(0).is_empty());
+    }
+
+    fn report() -> Report {
+        Report {
+            issuer: [1; 32],
+            contract: [2; 32],
+            party: [3; 32],
+            start: 10,
+            end: 20,
+            rooms: vec![[4; 32]],
+            runs: vec![[5; 32], [6; 32]],
+            lines: vec![Line { split: 0, class: 1, breaks: 2, break_ms: 9, slots: 4, unslotted: 0, ppm: 500_000, cited: 3, cites: [7; 32] }],
+            breaks: 2,
+            break_ms: 9,
+            slots: 4,
+            sig: [8; 64],
+        }
+    }
+
+    #[test]
+    fn a_report_reads_back_and_keeps_its_rules() {
+        let r = report();
+        assert_eq!(Report::read(&r.to_bytes()), Ok(r.clone()));
+        let b = r.to_bytes();
+        assert_eq!(Report::read(&b[..3]), Err(TRUNCATED));
+        assert_eq!(Report::read(&[b"WOR2".as_slice(), &b[4..]].concat()), Err(MALFORMED));
+        assert_eq!(Report::read(&[&b[..4], &[2u8][..], &b[5..]].concat()), Err(UNKNOWN_VERSION));
+        assert_eq!(Report::read(&[b.as_slice(), &[0u8][..]].concat()), Err(MALFORMED));
+        for bad in [
+            Report { end: 10, ..r.clone() },
+            Report { party: [0; 32], ..r.clone() },
+            Report { runs: vec![[6; 32], [5; 32]], ..r.clone() },
+            Report { lines: vec![Line { class: 3, ..r.lines[0] }], ..r.clone() },
+            Report { lines: vec![Line { unslotted: 3, ..r.lines[0] }], ..r.clone() },
+            Report { lines: vec![Line { ppm: 0, ..r.lines[0] }], ..r.clone() },
+        ] {
+            assert_eq!(Report::read(&bad.to_bytes()), Err(Reason::OpportunityReportInvalid.code()));
+        }
+    }
+
+    #[test]
+    fn a_check_reads_back_and_keeps_its_rules() {
+        let line = |scope_: u8, key: &str| CheckLine {
+            scope: scope_,
+            key: key.as_bytes().to_vec(),
+            breaks: 1,
+            break_ms: 2,
+            slots: 3,
+            unslotted: 0,
+            impressions: 4,
+            revenue: 5,
+            fill_ppm: 6,
+            revenue_per_slot: 7,
+            signed: None,
+            flags: 0,
+        };
+        let c = Check {
+            issuer: [1; 32],
+            report: [2; 32],
+            reported: [3; 32],
+            form: form::CSV,
+            statement: [0; 32],
+            floor_ppm: FLOOR_PPM,
+            ceiling_ppm: CEILING_PPM,
+            lines: vec![CheckLine { signed: Some((1, 2)), ..line(scope::PERIOD, "") }, line(scope::DAY, "2026-10-16"), line(scope::PROGRAMME, "a/ep-1")],
+            sig: [9; 64],
+        };
+        assert_eq!(Check::read(&c.to_bytes()), Ok(c.clone()));
+        let invalid = Reason::StatementCheckInvalid.code();
+        for bad in [
+            Check { form: 3, ..c.clone() },
+            Check { floor_ppm: WHOLE + 1, ..c.clone() },
+            Check { ceiling_ppm: WHOLE - 1, ..c.clone() },
+            Check { lines: c.lines[1..].to_vec(), ..c.clone() },
+            Check { lines: vec![c.lines[0].clone(), c.lines[2].clone(), c.lines[1].clone()], ..c.clone() },
+            Check { lines: vec![c.lines[0].clone(), line(scope::DAY, "2026-02-30")], ..c.clone() },
+            Check { lines: vec![c.lines[0].clone(), CheckLine { signed: Some((0, 0)), ..line(scope::DAY, "2026-10-16") }], ..c.clone() },
+            Check { lines: vec![CheckLine { flags: 0x80, ..c.lines[0].clone() }], ..c.clone() },
+        ] {
+            assert_eq!(Check::read(&bad.to_bytes()), Err(invalid));
+        }
+    }
+}
diff --git a/wai/wai-rs/src/opportunity_report/corpus.rs b/wai/wai-rs/src/opportunity_report/corpus.rs
new file mode 100644
index 000000000..176b67007
--- /dev/null
+++ b/wai/wai-rs/src/opportunity_report/corpus.rs
@@ -0,0 +1,853 @@
+//! The opportunity-report corpus (`live-conformance/opportunity/`,
+//! extensions/opportunity-report.md §14).
+//!
+//! Everything is written here from fixed seeds: every key is SHA-256 of this corpus's label, every
+//! time a constant, and Ed25519 signing is deterministic (RFC 8032), so the file is the same bytes
+//! on every machine. The world is a channel's day, 2026-10-16, under a contract of two owners: two
+//! windows of its program-as-run, a room whose producer cues breaks with SCTE 35 sections inside
+//! the owners' programmes, a ledger document billing the breaks' impressions and the operator's
+//! signed statements of the day. [`generate`] writes the corpus; [`verify`] checks every vector
+//! against the outcome it states.
+
+use std::collections::BTreeMap;
+
+use ed25519_dalek::{Signer, SigningKey};
+use serde_json::{Map, Value, json};
+
+use super::section::{Command, SegmentationSpec, write as section};
+use super::*;
+use crate::live_ads::{AdPolicy, NO_SKIP_CONTROL};
+use crate::live_events::{Cue, Payload, Policy as EventPolicy, cue_type, scte_form};
+use crate::live_room::{Caps, Descriptor, Detail, Grant, Limits, NO_CEILING, Recording, Review, Role};
+use crate::quantum_ops::GrantRef;
+use crate::receipt_ledger::{self as ledger, Tariff};
+use crate::revenue_share::{Split, Statement, rule};
+use crate::wai_video_channel::ScheduleEntry;
+use crate::wai_video_ssai::{AdCandidate, BreakBinding, SsaiBreakReceipt, asset_format, decide, pod_hash};
+
+/// 2026-10-01 and 2026-11-01 (00:00:00Z): the contract's period.
+const OCT: u64 = 1_790_812_800_000_000;
+const NOV: u64 = 1_793_491_200_000_000;
+/// 2026-10-16T00:00:00Z: the room's `t0` and the day every report states.
+pub const DAY16: u64 = 1_792_108_800_000_000;
+pub const DAY_US: u64 = 86_400_000_000;
+pub const DAY17: u64 = DAY16 + DAY_US;
+const T0_S: u64 = DAY16 / 1_000_000;
+const S: u64 = 1_000_000;
+pub const CHANNEL: &str = "fast-9";
+/// Per presented and per billable impression: 1.5 and 1 minor unit, in millionths.
+const PRICES: [u64; 2] = [1_500_000, 1_000_000];
+/// The decider grant's ceiling, in minor units of EUR.
+const BUDGET_MINOR: u64 = 10;
+/// Sessions per break.
+const SESSIONS: u8 = 3;
+
+/// A key of the corpus, from its fixed seed: `operator`, `owner-a`, `owner-b`, `channel`, `buyer`,
+/// `auditor`, `stranger`, and the room's `authority`, `clock`, `producer` and `decider`. Test
+/// keys, never a deployment's.
+pub fn key(label: &str) -> SigningKey {
+    SigningKey::from_bytes(&sha256(&[b"wai:opportunity-corpus\x01", label.as_bytes()]))
+}
+
+pub fn pk(label: &str) -> [u8; 32] {
+    key(label).verifying_key().to_bytes()
+}
+
+// ---- the room ----
+
+fn bits(ks: &[u8]) -> [u8; 32] {
+    let mut b = [0u8; 32];
+    for &k in ks {
+        b[(k / 8) as usize] |= 1 << (k % 8);
+    }
+    b
+}
+
+fn role(name: &str, subscribe: bool, events: &[u8]) -> Role {
+    Role { name: name.into(), caps: Caps { publish: 0, subscribe, max_layer: subscribe as u8, powers: 0 }, events: bits(events) }
+}
+
+/// A principal's chain being written.
+#[derive(Clone)]
+struct Chain {
+    label: &'static str,
+    seq: u64,
+    prev: [u8; 32],
+    records: Vec<Vec<u8>>,
+}
+
+/// A room being written: the clock's chain, then the producer's.
+#[derive(Clone)]
+pub struct RoomBuild {
+    pub descriptor: Vec<u8>,
+    pub id: [u8; 32],
+    pub grants: Vec<Vec<u8>>,
+    decider: Grant,
+    chains: Vec<Chain>,
+    pub policy: AdPolicy,
+}
+
+impl RoomBuild {
+    /// A room whose descriptor admits `max_present` (so that two rooms have two ids): a producer
+    /// that cues breaks, and a decider with the room's ad budget that never joins.
+    fn new(max_present: u16) -> RoomBuild {
+        let d = Descriptor {
+            authority: pk("authority"),
+            clock: pk("clock"),
+            t0_us: DAY16,
+            tick_us: S,
+            origin: String::new(),
+            limits: Limits { max_present: max_present.into(), max_publishers: 4, reval_s: 0, ceiling: EventPolicy::default() },
+            roles: vec![role("producer", true, &[kind::META, kind::CUE, kind::CHAT]), role("decider", false, &[])],
+            slots: vec![],
+            profiles: vec![],
+            review: Review { kinds: [0; 32], deadline_ms: 0, fallback: 0 },
+            recording: Recording { mode: 0, retention_days: 0, commit_interval_ms: 0, jitter_ms: 0, regions: vec![] },
+            sig: [0; 64],
+        }
+        .sign(&key("authority"));
+        let id = d.room_id();
+        let grant = |who: &str, r: usize, funds: Option<u64>| {
+            let role = &d.roles[r];
+            let kinds: Vec<u8> = (0..=255u8).filter(|&k| role.events[(k / 8) as usize] & (1 << (k % 8)) != 0).collect();
+            Grant {
+                room: id,
+                principal: pk(who),
+                prev: [0; 32],
+                effective: 0,
+                nbf: T0_S - 3_600,
+                exp: T0_S + 86_400,
+                role: r as u8,
+                caps: role.caps,
+                precedence: 0,
+                once: [0; 16],
+                viewer: [0; 16],
+                policy: EventPolicy::with_kinds(&kinds),
+                joules_ceiling: NO_CEILING,
+                funds_ceiling: funds.unwrap_or(NO_CEILING),
+                currency: if funds.is_some() { *b"EUR" } else { [0; 3] },
+                profiles: vec![],
+                origins: vec![],
+                attrs: vec![],
+                sig: [0; 64],
+            }
+            .sign(&key("authority"))
+        };
+        let producer = grant("producer", 0, None);
+        let decider = grant("decider", 1, Some(BUDGET_MINOR));
+        let policy = AdPolicy {
+            room: id,
+            decider_grant: decider.digest(),
+            slots: 2,
+            open_avail_ms: 30_000,
+            preload_ms: 0,
+            restrict: 0,
+            skip_after_s: NO_SKIP_CONTROL,
+            snap: 0,
+            asset_base: "https://ads.channel.example/sgai/".into(),
+            creative_base: "https://cdn.channel.example/creatives/".into(),
+            presentation: None,
+            sig: [0; 64],
+        }
+        .sign(&key("authority"));
+        let mut room = RoomBuild {
+            descriptor: d.to_bytes(),
+            id,
+            grants: vec![producer.to_bytes(), decider.to_bytes()],
+            decider,
+            chains: vec![Chain { label: "clock", seq: 0, prev: [0; 32], records: vec![] }, Chain { label: "producer", seq: 0, prev: [0; 32], records: vec![] }],
+            policy,
+        };
+        let j = Detail::Join { grant: producer.digest() };
+        room.raw(0, 0, j.kind(), Payload::Lifecycle { kind: j.kind(), subject: pk("producer"), detail: j.encode() }.encode());
+        room
+    }
+
+    fn raw(&mut self, chain: usize, t: u64, kind_: u8, payload: Vec<u8>) -> [u8; 32] {
+        let c = &mut self.chains[chain];
+        let e = Event::sign(&key(c.label), self.id, c.seq, c.prev, t, None, kind_, payload);
+        c.seq += 1;
+        c.prev = e.digest();
+        c.records.push(e.to_bytes());
+        c.prev
+    }
+
+    /// The producer's cue at `t` seconds of the room clock, with its section when it has one.
+    fn cue(&mut self, t_s: u64, ctype: u8, cue_id: u32, duration_ms: u32, scte: Option<Vec<u8>>) -> [u8; 32] {
+        let c = Payload::Cue(Cue { cue_type: ctype, cue_id, duration_ms, scte: scte.map(|s| (scte_form::SPLICE_INFO_SECTION, s)) });
+        self.raw(1, t_s * S, kind::CUE, c.encode())
+    }
+
+    pub fn chains(&self) -> Vec<Vec<Vec<u8>>> {
+        self.chains.iter().map(|c| c.records.clone()).collect()
+    }
+
+    pub fn input(&self) -> RoomInput {
+        RoomInput { descriptor: self.descriptor.clone(), grants: self.grants.clone(), key_log: None, chains: self.chains(), policy: self.policy.to_bytes() }
+    }
+}
+
+/// The program clock's `pts_time` of an instant of `t` seconds (cue-injection §5.2).
+fn pts(t_s: u64) -> u64 {
+    (t_s * S * 9 / 100) % (1 << 33)
+}
+
+/// A placement opportunity, or another segmentation type, of `cue_id`, `seconds` long.
+fn seg(cue_id: u32, seconds: u64, type_id: u8, sub: Option<(u8, u8)>) -> SegmentationSpec {
+    SegmentationSpec { event_id: cue_id, cancelled: false, duration: Some(seconds * 90_000), type_id, sub }
+}
+
+/// How the main room's cues are written.
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum Cues {
+    Main,
+    /// Cue 2's section with its CRC's last byte flipped.
+    BadCrc,
+    /// Cue 4's section naming segmentation event 40.
+    OtherId,
+}
+
+/// The main room's breaks: (cue id, start s, type, duration ms, the in's start s), in order.
+pub const BREAKS: [(u32, u64, u8, u32, Option<u64>); 8] = [
+    (1, 600, cue_type::OUT, 60_000, Some(660)),
+    (2, 1_200, cue_type::BREAK, 90_000, None),
+    (3, 1_800, cue_type::BREAK, 90_000, None),
+    (4, 2_400, cue_type::OUT, 120_000, Some(2_520)),
+    (5, 3_000, cue_type::BREAK, 60_000, None),
+    (6, 4_200, cue_type::BREAK, 90_000, None),
+    (7, 6_000, cue_type::BREAK, 120_000, None),
+    (8, 6_600, cue_type::BREAK, 60_000, None),
+];
+
+/// The main room: the producer cues eight breaks of the day, each kind of section §5 reads
+/// among them, and returns the room with each break's opening cue and avail.
+fn main_room(cues: Cues) -> (RoomBuild, Vec<([u8; 32], u64)>) {
+    let mut r = RoomBuild::new(16);
+    let mut opened = Vec::new();
+    for (id, t, ctype, dur, in_at) in BREAKS {
+        let secs = dur as u64 / 1000;
+        let s = match id {
+            // A splice_insert() with its break duration: slots from the policy.
+            1 => Some(section(&Command::Insert { id, cancel: false, out: true, duration: Some(secs * 90_000) }, &[])),
+            // Provider and distributor placement opportunities stating three and four slots.
+            2 | 3 | 4 | 7 => {
+                let ty = if id == 3 { 0x36 } else { 0x34 };
+                let n = if dur >= 120_000 { 4 } else { 3 };
+                let event = if id == 4 && cues == Cues::OtherId { 40 } else { id };
+                let mut s = section(&Command::TimeSignal { pts: pts(t) }, &[seg(event, secs, ty, Some((1, n)))]);
+                if id == 2 && cues == Cues::BadCrc {
+                    let n = s.len();
+                    s[n - 1] ^= 0x01;
+                }
+                Some(s)
+            }
+            // A splice_insert() carrying a placement opportunity of three slots.
+            6 => Some(section(&Command::Insert { id, cancel: false, out: true, duration: Some(secs * 90_000) }, &[SegmentationSpec { duration: None, ..seg(id, 0, 0x34, Some((1, 3))) }])),
+            // A provider advertisement start, a type that states no slots.
+            8 => Some(section(&Command::TimeSignal { pts: pts(t) }, &[seg(id, secs, 0x30, None)])),
+            // A cue of form 0.
+            _ => None,
+        };
+        opened.push((r.cue(t, ctype, id, dur, s), dur as u64));
+        if let Some(t_in) = in_at {
+            r.cue(t_in, cue_type::IN, id, dur, None);
+        }
+    }
+    (r, opened)
+}
+
+/// A second room of the channel's: one break, at 55 minutes, or at 20½ minutes, inside cue 2's.
+fn backup_room(overlapping: bool) -> RoomBuild {
+    let mut r = RoomBuild::new(15);
+    let t = if overlapping { 1_230 } else { 3_300 };
+    r.cue(t, cue_type::BREAK, 9, 60_000, None);
+    r
+}
+
+// ---- the ledger ----
+
+fn ad(id: &str, creative: u8, duration_ms: u64, price_micros: u64) -> AdCandidate {
+    AdCandidate { ad_id: id.into(), creative_hash: sha256(&[b"wai:opportunity-corpus/creative\x01", &[creative]]), duration_ms, price_micros }
+}
+
+/// Three ads: two of 15 s and one of 20 s.
+fn pod() -> Vec<AdCandidate> {
+    vec![ad("ad-a", 1, 15_000, 40_000), ad("ad-b", 2, 15_000, 30_000), ad("ad-c", 3, 20_000, 25_000)]
+}
+
+fn session(i: u8) -> [u8; 16] {
+    sha256(&[b"wai:opportunity-corpus/session\x01", &[i]])[..16].try_into().expect("16 bytes")
+}
+
+/// A viewer's receipt for a break: the fill of the pod, every ad played to its end.
+fn receipt(r: &RoomBuild, cue: [u8; 32], avail_ms: u64, s: u8) -> SsaiBreakReceipt {
+    let funds = BUDGET_MINOR * 1_000_000;
+    let fill = decide(&pod(), r.policy.slots as u64, avail_ms, funds);
+    let mut imps = fill.clone();
+    for i in &mut imps {
+        i.quartiles_reached = 4;
+    }
+    let list = crate::live_ads::asset_list(&r.policy, asset_format::HLS, &fill);
+    let binding = BreakBinding {
+        room: r.id,
+        cue,
+        session: session(s),
+        start_offset_ms: 0,
+        format: asset_format::HLS,
+        asset_list_sha256: sha256(&[&list]),
+        avail_ms,
+        slots: r.policy.slots as u64,
+        funds_remaining_micros: funds,
+    };
+    let (grant_hash, capability, joule_ceiling_micro, funds_ceiling) = r.decider.grant_ref();
+    let grant = GrantRef { grant_hash, capability: capability.into(), joule_ceiling_micro, funds_ceiling };
+    SsaiBreakReceipt::seal(&key("decider"), crate::signer_id::did_key(&pk("decider")), binding, pod_hash(&pod()), imps, pod().len() as u64, 0, None, grant)
+}
+
+/// The room as a source of the receipt ledger, with every viewer's receipt for every break.
+fn ads_source(r: &RoomBuild, opened: &[([u8; 32], u64)]) -> Value {
+    let mut receipts = Vec::new();
+    let mut pods = Vec::new();
+    let pod_json: Vec<Value> = pod().iter().map(|c| json!({"ad_id": c.ad_id, "creative_hash": hex(&c.creative_hash), "duration_ms": c.duration_ms, "price_micros": c.price_micros})).collect();
+    for (cue, avail) in opened {
+        for s in 1..=SESSIONS {
+            receipts.push(receipt(r, *cue, *avail, s).to_json());
+            pods.push(Value::Array(pod_json.clone()));
+        }
+    }
+    let i = r.input();
+    json!({
+        "kind": "ads", "descriptor": hex(&i.descriptor), "grants": i.grants.iter().map(|g| hex(g)).collect::<Vec<_>>(), "key_log": null,
+        "chains": i.chains.iter().map(|c| c.iter().map(|e| hex(e)).collect::<Vec<_>>()).collect::<Vec<_>>(), "policy": hex(&i.policy), "pt0_ms": 0,
+        "receipts": receipts, "pods": pods, "claims": [], "creatives": [], "issuers": [],
+    })
+}
+
+// ---- the channel ----
+
+fn entry(asset: &str, start_s: u64, duration_s: u64, kind_: EntryKind) -> ScheduleEntry {
+    ScheduleEntry { asset_id: asset.into(), start_ms: DAY16 / 1000 + start_s * 1000, duration_ms: duration_s * 1000, kind: kind_ }
+}
+
+fn run(schedule: Vec<ScheduleEntry>, window_s: (u64, u64), parent: Option<[u8; 32]>) -> ChannelReceipt {
+    let ms = |s: u64| DAY16 / 1000 + s * 1000;
+    ChannelReceipt::seal(&key("channel"), "did:key:channel-signer", CHANNEL, schedule, ms(window_s.0), ms(window_s.1), 0, None, GrantRef::unbounded("video.channel"), parent)
+}
+
+/// The day's first two hours, one window each: owner A's episode, an ad slot, owner B's
+/// documentary; then A's next episode, an ad slot no cue covers, and B's next documentary.
+fn runs(last: &str) -> (ChannelReceipt, ChannelReceipt) {
+    let r1 = run(vec![entry("a/ep-1", 0, 1_800, EntryKind::Program), entry("slate-90", 1_800, 90, EntryKind::Ad), entry("b/doc-1", 1_890, 1_710, EntryKind::Program)], (0, 3_600), None);
+    let r2 = run(vec![entry("a/ep-2", 3_600, 1_740, EntryKind::Program), entry("mid-60", 5_340, 60, EntryKind::Ad), entry(last, 5_400, 1_800, EntryKind::Program)], (3_600, 7_200), Some(r1.receipt_hash()));
+    (r1, r2)
+}
+
+/// The contract: two owners, a split each and a between split, under the rule preceding.
+fn contract(rooms: &[[u8; 32]]) -> Contract {
+    let mut owners = vec![pk("owner-a"), pk("owner-b")];
+    owners.sort();
+    let ia = owners.iter().position(|k| *k == pk("owner-a")).expect("listed") as u8;
+    let ib = 1 - ia;
+    let mut carriers: Vec<(u8, [u8; 32])> = rooms.iter().map(|r| (share::carrier::ROOM, *r)).collect();
+    carriers.sort();
+    let mut halves = vec![(ia, 500_000), (ib, 500_000)];
+    halves.sort();
+    Contract {
+        operator: pk("operator"),
+        start: OCT,
+        end: NOV,
+        currency: *b"EUR",
+        channel: CHANNEL.as_bytes().to_vec(),
+        channel_signer: pk("channel"),
+        rule: rule::PRECEDING,
+        between: 2,
+        carriers,
+        owners,
+        splits: vec![
+            Split { operator_ppm: 666_667, shares: vec![(ia, 333_333)] },
+            Split { operator_ppm: 400_000, shares: vec![(ib, 600_000)] },
+            Split { operator_ppm: 0, shares: halves },
+        ],
+        assets: ["a/ep-1", "a/ep-2", "b/doc-1", "b/doc-2"].iter().map(|a| (a.as_bytes().to_vec(), if a.starts_with('a') { 0 } else { 1 })).collect(),
+        operator_sig: [0; 64],
+        countersigs: Vec::new(),
+    }
+}
+
+fn in_force(c: Contract) -> Contract {
+    c.offer(&key("operator")).countersign(&key("owner-a")).expect("an owner").countersign(&key("owner-b")).expect("an owner")
+}
+
+// ---- the corpus ----
+
+/// The named parts every vector draws on.
+pub struct Pools {
+    pub contracts: BTreeMap<String, Value>,
+    pub runs: BTreeMap<String, Value>,
+    pub rooms: BTreeMap<String, Value>,
+    pub ledgers: BTreeMap<String, Value>,
+    pub reported: BTreeMap<String, Value>,
+}
+
+/// A report's verification document by names (§8.1).
+#[derive(Clone)]
+pub struct ReportParts {
+    pub contract: &'static str,
+    pub contracts: Vec<&'static str>,
+    pub report: Vec<u8>,
+    pub runs: Option<Vec<&'static str>>,
+    pub rooms: Vec<&'static str>,
+}
+
+/// A revenue-share verification document by names.
+#[derive(Clone)]
+pub struct StatementParts {
+    pub contract: &'static str,
+    pub statement: Vec<u8>,
+    pub runs: Vec<&'static str>,
+    pub ledgers: Vec<&'static str>,
+}
+
+impl Pools {
+    fn named(&self, pool: &BTreeMap<String, Value>, n: &str) -> Value {
+        pool.get(n).unwrap_or_else(|| panic!("no part {n}")).clone()
+    }
+
+    /// A report's document, with its report or without one.
+    pub fn report_document(&self, p: &ReportParts, with_report: bool) -> Value {
+        let mut d = Map::new();
+        d.insert("contract".into(), self.named(&self.contracts, p.contract));
+        d.insert("contracts".into(), Value::Array(p.contracts.iter().map(|n| self.named(&self.contracts, n)).collect()));
+        if with_report {
+            d.insert("report".into(), json!(hex(&p.report)));
+        }
+        d.insert("runs".into(), p.runs.as_ref().map_or(Value::Null, |r| Value::Array(r.iter().map(|n| self.named(&self.runs, n)).collect())));
+        d.insert("rooms".into(), Value::Array(p.rooms.iter().map(|n| self.named(&self.rooms, n)).collect()));
+        Value::Object(d)
+    }
+
+    pub fn statement_document(&self, p: &StatementParts, with_statement: bool) -> Value {
+        let mut d = Map::new();
+        d.insert("contract".into(), self.named(&self.contracts, p.contract));
+        d.insert("contracts".into(), json!([]));
+        if with_statement {
+            d.insert("statement".into(), json!(hex(&p.statement)));
+        }
+        d.insert("runs".into(), Value::Array(p.runs.iter().map(|n| self.named(&self.runs, n)).collect()));
+        d.insert("ledgers".into(), Value::Array(p.ledgers.iter().map(|n| self.named(&self.ledgers, n)).collect()));
+        Value::Object(d)
+    }
+
+    /// A check's document, with its check or without one.
+    pub fn check_document(&self, report: &ReportParts, reported: &str, statement: Option<&StatementParts>, check: Option<&[u8]>) -> Value {
+        let mut d = Map::new();
+        d.insert("report".into(), self.report_document(report, true));
+        d.insert("reported".into(), self.named(&self.reported, reported));
+        d.insert("statement".into(), statement.map_or(Value::Null, |s| self.statement_document(s, true)));
+        if let Some(c) = check {
+            d.insert("check".into(), json!(hex(c)));
+        }
+        Value::Object(d)
+    }
+}
+
+/// The world of the corpus: its pools, and the parts its accepted vectors name.
+pub struct World {
+    pub pools: Pools,
+    pub reports: BTreeMap<&'static str, ReportParts>,
+    pub statements: BTreeMap<&'static str, StatementParts>,
+}
+
+fn reported_json(r: Value) -> Value {
+    json!({"form": "json", "text": serde_json::to_string(&r).expect("JSON")})
+}
+
+/// B's reported statement of the day, per programme: its second documentary's impressions all
+/// but missing.
+fn b_programmes(channel: &str, extra: Option<Value>) -> Value {
+    let mut programmes = vec![json!({"asset": "b/doc-1", "impressions": 12, "revenue": 7_200_000}), json!({"asset": "b/doc-2", "impressions": 2, "revenue": 1_200_000})];
+    if let Some(e) = extra {
+        programmes.insert(0, e);
+    }
+    let (imps, rev) = programmes.iter().fold((0u64, 0u64), |(i, r), p| (i + p["impressions"].as_u64().unwrap(), r + p["revenue"].as_u64().unwrap()));
+    json!({"channel": channel, "start": DAY16, "end": DAY17, "currency": "EUR", "basis": "share", "impressions": imps, "revenue": rev, "programmes": programmes})
+}
+
+/// A's reported statement of the day in CSV, per day: what the signed statement states.
+fn a_days(header: &str) -> String {
+    format!("{header}\r\nchannel,{CHANNEL},,\r\nstart,{DAY16},,\r\nend,{DAY17},,\r\ncurrency,EUR,,\r\nbasis,share,,\r\nperiod,,24,7999992\r\nday,2026-10-16,24,7999992\r\n")
+}
+
+/// Build the world: pools, the day's reports and statements.
+pub fn world() -> Result<World, String> {
+    let (main, opened) = main_room(Cues::Main);
+    let backup = backup_room(false);
+    let mut rooms = BTreeMap::new();
+    let mut put_room = |n: &str, r: &RoomInput| {
+        rooms.insert(n.to_string(), r.to_json());
+    };
+    put_room("main", &main.input());
+    put_room("main_crc_flipped", &main_room(Cues::BadCrc).0.input());
+    put_room("main_other_segmentation_id", &main_room(Cues::OtherId).0.input());
+    put_room("backup", &backup.input());
+    put_room("backup_overlapping", &backup_room(true).input());
+    let mut gap = main.input();
+    gap.chains[1].remove(4);
+    put_room("main_with_a_gap", &gap);
+    let mut flipped = main.input();
+    let last = flipped.chains[1][2].len() - 1;
+    flipped.chains[1][2][last] ^= 0x01;
+    put_room("main_signature_flipped", &flipped);
+
+    let (r1, r2) = runs("b/doc-2");
+    let (_, r2_unmapped) = runs("c/film-9");
+    let mut runs_ = BTreeMap::new();
+    runs_.insert("hour_1".to_string(), r1.to_json());
+    runs_.insert("hour_2".to_string(), r2.to_json());
+    runs_.insert("hour_2_unmapped".to_string(), r2_unmapped.to_json());
+    let mut tampered = r1.clone();
+    tampered.aired = vec![0];
+    tampered.sig = key("channel").sign(&tampered.payload()).to_bytes();
+    runs_.insert("hour_1_aired_misstated".to_string(), tampered.to_json());
+    let part_1 = run(r1.schedule.clone(), (0, 1_850), None);
+    let part_2 = run(r1.schedule.clone(), (1_850, 3_600), Some(part_1.receipt_hash()));
+    runs_.insert("hour_1_to_1850_s".to_string(), part_1.to_json());
+    runs_.insert("hour_1_from_1850_s".to_string(), part_2.to_json());
+    let other = ChannelReceipt::seal(&key("channel"), "did:key:channel-signer", "fast-8", r1.schedule.clone(), r1.window_start_ms, r1.window_end_ms, 0, None, GrantRef::unbounded("video.channel"), None);
+    runs_.insert("fast_8".to_string(), other.to_json());
+    runs_.insert("hour_1_overlapping".to_string(), run(r1.schedule.clone(), (3_000, 4_000), None).to_json());
+
+    let c = in_force(contract(&[main.id]));
+    let two = in_force(contract(&[main.id, backup.id]));
+    let offered = contract(&[main.id]).offer(&key("operator")).countersign(&key("owner-a")).expect("an owner");
+    let mut contracts = BTreeMap::new();
+    contracts.insert("main".to_string(), json!(hex(&c.to_bytes())));
+    contracts.insert("two_rooms".to_string(), json!(hex(&two.to_bytes())));
+    contracts.insert("offered".to_string(), json!(hex(&offered.to_bytes())));
+    let mut late = contract(&[main.id]);
+    (late.start, late.end) = (OCT + 20 * DAY_US, NOV + 20 * DAY_US);
+    contracts.insert("overlapping".to_string(), json!(hex(&in_force(late).to_bytes())));
+
+    // The ledger: the room's receipts for every break, billed for the day.
+    let source = ads_source(&main, &opened);
+    let t = Tariff {
+        seller: pk("operator"),
+        buyer: pk("buyer"),
+        start: OCT,
+        end: NOV,
+        currency: *b"EUR",
+        room: [0; ledger::ROOM_PRICES],
+        delivery: [0; 4],
+        package: [0; 3],
+        ads: PRICES,
+        scope: vec![(4, pk("decider"))],
+        seller_sig: [0; 64],
+        buyer_sig: [0; 64],
+    }
+    .sign(&key("operator"), &key("buyer"));
+    let invoice = ledger::make_invoice(&key("operator"), &t, None, DAY16, DAY17, std::slice::from_ref(&source)).map_err(|e| format!("the day's invoice: {e:?}"))?;
+    let mut ledgers = BTreeMap::new();
+    ledgers.insert("day_16".to_string(), json!({"tariff": hex(&t.to_bytes()), "invoice": hex(&invoice.to_bytes()), "previous": null, "sources": [source]}));
+
+    let mut reported = BTreeMap::new();
+    reported.insert("b_programmes".to_string(), reported_json(b_programmes(CHANNEL, None)));
+    reported.insert("b_programmes_and_a_programme".to_string(), reported_json(b_programmes(CHANNEL, Some(json!({"asset": "a/ep-1", "impressions": 5, "revenue": 3_000_000})))));
+    reported.insert("b_programmes_of_another_channel".to_string(), reported_json(b_programmes("fast-8", None)));
+    let mut outside = b_programmes(CHANNEL, None);
+    outside["days"] = json!([{"day": "2026-10-17", "impressions": 14, "revenue": 8_400_000}]);
+    reported.insert("b_a_day_after_the_period".to_string(), reported_json(outside));
+    reported.insert("a_days".to_string(), json!({"form": "csv", "text": a_days("scope,key,impressions,revenue")}));
+    reported.insert("a_days_header_misspelt".to_string(), json!({"form": "csv", "text": a_days("scope,key,impression,revenue")}));
+    reported.insert("of_another_form".to_string(), json!({"form": "xml", "text": "<reported/>"}));
+
+    let pools = Pools { contracts, runs: runs_, rooms, ledgers, reported };
+
+    // The operator's signed statements of the day.
+    let mut statements = BTreeMap::new();
+    for (name, who) in [("owner_a", "owner-a"), ("owner_b", "owner-b"), ("operator", "operator")] {
+        let mut sp = StatementParts { contract: "main", statement: Vec::new(), runs: vec!["hour_1", "hour_2"], ledgers: vec!["day_16"] };
+        let (s, _): (Statement, Value) = share::create(&pools.statement_document(&sp, false), &key("operator"), pk(who), DAY16, DAY17).map_err(|e| format!("the statement of {who}: {e:?}"))?;
+        sp.statement = s.to_bytes();
+        statements.insert(name, sp);
+    }
+
+    // The reports of the day.
+    let mut reports = BTreeMap::new();
+    let both = || Some(vec!["hour_1", "hour_2"]);
+    let split = || Some(vec!["hour_1_to_1850_s", "hour_1_from_1850_s", "hour_2"]);
+    for (name, contract_, runs__, rooms_, who, issuer, end) in [
+        ("owner_a", "main", both(), vec!["main"], "owner-a", "owner-a", DAY17),
+        ("owner_b", "main", both(), vec!["main"], "owner-b", "owner-b", DAY17),
+        ("operator", "main", both(), vec!["main"], "operator", "operator", DAY17),
+        ("owner_a_runs_alone", "main", both(), vec![], "owner-a", "auditor", DAY17),
+        ("owner_a_runs_split", "main", split(), vec![], "owner-a", "auditor", DAY17),
+        ("owner_b_first_hour", "main", both(), vec!["main"], "owner-b", "owner-b", DAY16 + 3_600 * S),
+        ("owner_b_two_rooms", "two_rooms", both(), vec!["main", "backup"], "owner-b", "auditor", DAY17),
+    ] {
+        let mut rp = ReportParts { contract: contract_, contracts: vec![], report: Vec::new(), runs: runs__, rooms: rooms_ };
+        let (r, _) = super::create(&pools.report_document(&rp, false), &key(issuer), pk(who), DAY16, end).map_err(|e| format!("the report {name}: {e:?}"))?;
+        rp.report = r.to_bytes();
+        reports.insert(name, rp);
+    }
+    Ok(World { pools, reports, statements })
+}
+
+/// A report changed and signed again by its issuer.
+fn resealed(r: &[u8], issuer: &str, f: impl FnOnce(&mut Report)) -> Vec<u8> {
+    let mut r = Report::read(r).expect("a corpus report reads");
+    f(&mut r);
+    r.sign(&key(issuer)).to_bytes()
+}
+
+/// A check changed and signed again by its issuer.
+fn check_resealed(c: &[u8], issuer: &str, f: impl FnOnce(&mut Check)) -> Vec<u8> {
+    let mut c = Check::read(c).expect("a corpus check reads");
+    f(&mut c);
+    c.sign(&key(issuer)).to_bytes()
+}
+
+fn flip(b: &[u8], at: usize) -> Vec<u8> {
+    let mut b = b.to_vec();
+    b[at] ^= 0x01;
+    b
+}
+
+/// One vector: a report's document or a check's, by names.
+enum Vector {
+    Report { name: &'static str, about: &'static str, parts: ReportParts },
+    Check { name: &'static str, about: &'static str, report: ReportParts, reported: &'static str, statement: Option<StatementParts>, check: Vec<u8> },
+}
+
+fn report_parts_json(p: &ReportParts) -> Value {
+    json!({"contract": p.contract, "contracts": p.contracts, "report": hex(&p.report), "runs": p.runs, "rooms": p.rooms})
+}
+
+fn statement_parts_json(p: &StatementParts) -> Value {
+    json!({"contract": p.contract, "statement": hex(&p.statement), "runs": p.runs, "ledgers": p.ledgers})
+}
+
+/// Write the corpus, from fixed seeds.
+pub fn generate() -> Result<String, String> {
+    let w = world()?;
+    let p = &w.pools;
+    let rep = |n: &str| w.reports[n].clone();
+    let st = |n: &str| w.statements[n].clone();
+    let a = rep("owner_a");
+    let ra = a.report.clone();
+    let b_lines = Report::read(&rep("owner_b").report).expect("reads").lines;
+    let with = |name: &'static str, about: &'static str, f: &dyn Fn(&mut ReportParts)| {
+        let mut parts = a.clone();
+        f(&mut parts);
+        Vector::Report { name, about, parts }
+    };
+    let report = |name: &'static str, about: &'static str, report: Vec<u8>| with(name, about, &|x: &mut ReportParts| x.report = report.clone());
+    // The checks of the day, signed by the owner each is for.
+    let check_of = |report: &str, reported: &str, statement: Option<&str>, issuer: &str| -> Result<Vec<u8>, String> {
+        let s = statement.map(|n| w.statements[n].clone());
+        let inputs = p.check_document(&w.reports[report], reported, s.as_ref(), None);
+        create_check(&inputs, &key(issuer), FLOOR_PPM, CEILING_PPM).map(|(c, _)| c.to_bytes()).map_err(|e| format!("the check of {report} and {reported}: {e:?}"))
+    };
+    let cb = check_of("owner_b", "b_programmes", Some("owner_b"), "owner-b")?;
+    let ca = check_of("owner_a", "a_days", Some("owner_a"), "owner-a")?;
+    let cb_alone = check_of("owner_b", "b_programmes", None, "owner-b")?;
+    let cb_unproved = check_of("owner_b", "b_programmes_and_a_programme", None, "owner-b")?;
+    let check = |name: &'static str, about: &'static str, report: ReportParts, reported: &'static str, statement: Option<StatementParts>, check: Vec<u8>| Vector::Check { name, about, report, reported, statement, check };
+    let b = rep("owner_b");
+    let b_check = |name: &'static str, about: &'static str, check_: Vec<u8>| check(name, about, b.clone(), "b_programmes", Some(st("owner_b")), check_);
+    let mut b_report_flipped = b.clone();
+    let n = b_report_flipped.report.len();
+    b_report_flipped.report = flip(&b_report_flipped.report, n - 10);
+    let mut b_statement_flipped = st("owner_b");
+    let n = b_statement_flipped.statement.len();
+    b_statement_flipped.statement = flip(&b_statement_flipped.statement, n - 10);
+
+    let vectors = vec![
+        // Accepted reports.
+        Vector::Report { name: "owner_a_day", about: "owner A's day: four cued breaks in its episodes, one of them inside the ad slot after its first episode, and the ad slot no cue covers, scheduled and unslotted", parts: rep("owner_a") },
+        Vector::Report { name: "owner_b_day", about: "owner B's day: four cued breaks in its documentaries, slots from placement opportunities and from the room's policy", parts: rep("owner_b") },
+        Vector::Report { name: "operator_day", about: "the operator's day: its share of both owners' splits; no line of the between split, in which it holds no share", parts: rep("operator") },
+        Vector::Report { name: "owner_a_runs_alone", about: "owner A's day from the runs alone: both ad slots scheduled, no cued break", parts: rep("owner_a_runs_alone") },
+        Vector::Report { name: "owner_a_runs_split", about: "owner A's day from the runs alone, the first hour in two windows that both air its ad slot: one break, taken in the earlier window", parts: rep("owner_a_runs_split") },
+        Vector::Report { name: "owner_b_first_hour", about: "owner B's first hour: the breaks of the second hour are another period's", parts: rep("owner_b_first_hour") },
+        Vector::Report { name: "owner_b_two_rooms", about: "owner B's day under a contract naming two rooms: a break of the second room in its first documentary, overlapping none", parts: rep("owner_b_two_rooms") },
+        // Accepted checks.
+        check("check_owner_b_under_reported", "owner B's reported statement per programme beside its report and the signed statement: its second documentary far below the day's rate, and the day below the signed impressions and revenue", b.clone(), "b_programmes", Some(st("owner_b")), cb.clone()),
+        check("check_owner_a_csv", "owner A's reported statement in CSV, per day, beside its report and the signed statement: nothing flagged", a.clone(), "a_days", Some(st("owner_a")), ca.clone()),
+        check("check_owner_b_without_statement", "owner B's reported statement beside its report alone", b.clone(), "b_programmes", None, cb_alone),
+        check("check_owner_b_reports_a_programme", "owner B's reported statement listing owner A's episode: impressions where no break of B's aired", b.clone(), "b_programmes_and_a_programme", None, cb_unproved),
+        // The report's document and contract.
+        with("document_malformed", "a report's document whose runs are not a list", &|x| x.runs = None),
+        with("contract_offered", "a contract owner B has not countersigned", &|x| x.contract = "offered"),
+        with("contract_overlap", "another contract of the channel whose period overlaps the contract's", &|x| x.contracts = vec!["overlapping"]),
+        // The report.
+        report("report_truncated", "a report of ten bytes", ra[..10].to_vec()),
+        report("report_magic", "a report whose magic is WOR2", [b"WOR2".as_slice(), &ra[4..]].concat()),
+        report("report_version_2", "a report of version 2", [&ra[..4], &[2u8][..], &ra[5..]].concat()),
+        report("report_lines_unordered", "a report whose lines are not in ascending order", resealed(&ra, "owner-a", |r| r.lines.reverse())),
+        report("report_of_another_contract", "a report naming the contract of two rooms", resealed(&ra, "owner-a", |r| r.contract = Contract::read(&unhex(p.contracts["two_rooms"].as_str().unwrap()).unwrap()).unwrap().digest())),
+        report("report_past_the_contract", "a report whose period ends a day after the contract's", resealed(&ra, "owner-a", |r| r.end = NOV + DAY_US)),
+        report("report_signature", "a report whose signature has a byte flipped", flip(&ra, ra.len() - 40)),
+        report("report_issuer_small_order", "a report whose issuer key is of small order", {
+            let mut b = ra.clone();
+            b[5..37].copy_from_slice(&crate::sig::IDENTITY);
+            b
+        }),
+        // The runs and the rooms.
+        with("run_aired_misstated", "a run whose aired set the window does not give, signed again", &|x| x.runs = Some(vec!["hour_1_aired_misstated", "hour_2"])),
+        with("run_of_another_channel", "a run of another channel, by the same signer", &|x| x.runs = Some(vec!["hour_1", "fast_8"])),
+        with("runs_overlapping", "a third run whose window overlaps the first's", &|x| x.runs = Some(vec!["hour_1", "hour_2", "hour_1_overlapping"])),
+        with("room_event_signature", "a room whose producer's third event has a byte of its signature flipped", &|x| x.rooms = vec!["main_signature_flipped"]),
+        with("room_with_a_gap", "a room whose producer's chain lacks its fifth event", &|x| x.rooms = vec!["main_with_a_gap"]),
+        with("room_foreign", "a room the contract does not name", &|x| x.rooms = vec!["backup"]),
+        with("room_repeated", "the contract's room given twice", &|x| x.rooms = vec!["main", "main"]),
+        // The breaks.
+        with("cue_section_crc", "a room whose second break's section has its CRC damaged", &|x| x.rooms = vec!["main_crc_flipped"]),
+        with("cue_section_other_id", "a room whose fourth break's section names segmentation event 40 for cue 4", &|x| x.rooms = vec!["main_other_segmentation_id"]),
+        Vector::Report {
+            name: "two_rooms_overlapping",
+            about: "a second room of the contract's whose break falls inside the first room's second break",
+            parts: ReportParts { rooms: vec!["main", "backup_overlapping"], ..rep("owner_b_two_rooms") },
+        },
+        with("break_outside_every_window", "the run of the first hour alone: the breaks of the second aired in no window held", &|x| x.runs = Some(vec!["hour_1"])),
+        with("asset_unmapped", "a run of the second hour whose last programme the contract does not map", &|x| x.runs = Some(vec!["hour_1", "hour_2_unmapped"])),
+        // The figures.
+        report("line_of_another_split", "owner A's report with a line of owner B's split", resealed(&ra, "owner-a", |r| r.lines.push(Line { ppm: 1, ..b_lines[0] }))),
+        report("line_citations_changed", "a line whose citation digest has a byte changed", resealed(&ra, "owner-a", |r| r.lines[0].cites[0] ^= 0x01)),
+        report("line_seconds_raised", "a line stating a second more of breaks, and the total with it", resealed(&ra, "owner-a", |r| {
+            r.lines[0].break_ms += 1_000;
+            r.break_ms += 1_000;
+        })),
+        report("runs_listed_short", "a report listing one of the two runs it is given", resealed(&ra, "owner-a", |r| r.runs.truncate(1))),
+        // The check's document, the report and the reported statement.
+        check("check_document_malformed", "a check's document whose reported statement is of a form this text does not define", b.clone(), "of_another_form", None, cb.clone()),
+        check("check_report_refused", "a check whose report has a byte of its signature flipped, refused at the report's place", b_report_flipped, "b_programmes", Some(st("owner_b")), cb.clone()),
+        check("reported_day_outside_the_period", "a reported statement listing a day after its period", b.clone(), "b_a_day_after_the_period", None, cb.clone()),
+        check("reported_csv_header", "a reported statement in CSV whose header misspells a column", a.clone(), "a_days_header_misspelt", None, ca.clone()),
+        check("reported_of_another_channel", "a reported statement of another channel", b.clone(), "b_programmes_of_another_channel", None, cb.clone()),
+        // The signed statement.
+        check("check_statement_refused", "a signed statement with a byte of its signature flipped, refused at the statement's place", b.clone(), "b_programmes", Some(b_statement_flipped), cb.clone()),
+        check("statement_of_another_owner", "owner B's report beside owner A's signed statement", b.clone(), "b_programmes", Some(st("owner_a")), cb.clone()),
+        // The check.
+        b_check("check_truncated", "a check of ten bytes", cb[..10].to_vec()),
+        b_check("check_floor_above_the_rate", "a check whose floor is above the whole", check_resealed(&cb, "owner-b", |c| c.floor_ppm = 1_500_000)),
+        b_check("check_flags_changed", "a check whose flags leave out the programme's below", check_resealed(&cb, "owner-b", |c| {
+            for l in &mut c.lines {
+                l.flags &= !(1 << 2);
+            }
+        })),
+        b_check("check_of_another_reported_statement", "a check naming the bytes of another reported statement", check_resealed(&cb, "owner-b", |c| c.reported = sha256(&[b"another"]))),
+        b_check("check_signature", "a check whose signature has a byte flipped", flip(&cb, cb.len() - 40)),
+    ];
+
+    let mut out = Vec::with_capacity(vectors.len());
+    for v in &vectors {
+        out.push(match v {
+            Vector::Report { name, about, parts } => {
+                let outcome = outcome_json(&super::verify(&p.report_document(parts, true)));
+                json!({"name": name, "about": about, "kind": "report", "report": report_parts_json(parts), "outcome": outcome})
+            }
+            Vector::Check { name, about, report, reported, statement, check } => {
+                let outcome = check_outcome_json(&verify_check(&p.check_document(report, reported, statement.as_ref(), Some(check))));
+                json!({
+                    "name": name, "about": about, "kind": "check", "report": report_parts_json(report), "reported": reported,
+                    "statement": statement.as_ref().map(statement_parts_json), "check": hex(check), "outcome": outcome,
+                })
+            }
+        });
+    }
+    let keys = json!({
+        "operator": hex(&pk("operator")), "owner_a": hex(&pk("owner-a")), "owner_b": hex(&pk("owner-b")), "channel_signer": hex(&pk("channel")),
+        "auditor": hex(&pk("auditor")), "producer": hex(&pk("producer")), "decider": hex(&pk("decider")),
+    });
+    let to_map = |m: &BTreeMap<String, Value>| Value::Object(m.clone().into_iter().collect());
+    let doc = json!({
+        "corpus": CAPABILITY,
+        "extension": "extensions/opportunity-report.md",
+        "keys": keys,
+        "contracts": to_map(&p.contracts),
+        "runs": to_map(&p.runs),
+        "rooms": to_map(&p.rooms),
+        "ledgers": to_map(&p.ledgers),
+        "reported": to_map(&p.reported),
+        "vectors": out,
+    });
+    Ok(serde_json::to_string_pretty(&doc).expect("JSON") + "\n")
+}
+
+/// The parts of the committed corpus, read back into pools.
+fn pools_of(doc: &Value) -> Option<Pools> {
+    let map = |k: &str| -> Option<BTreeMap<String, Value>> { Some(doc[k].as_object()?.iter().map(|(n, v)| (n.clone(), v.clone())).collect()) };
+    Some(Pools { contracts: map("contracts")?, runs: map("runs")?, rooms: map("rooms")?, ledgers: map("ledgers")?, reported: map("reported")? })
+}
+
+/// A name read back from the corpus, held for the life of the process (the corpus's parts name
+/// their pools by `&'static str`).
+fn leak(s: &str) -> &'static str {
+    Box::leak(s.to_string().into_boxed_str())
+}
+
+fn names(v: &Value) -> Option<Vec<&'static str>> {
+    v.as_array()?.iter().map(|n| n.as_str().map(leak)).collect()
+}
+
+fn report_parts(v: &Value) -> Option<ReportParts> {
+    Some(ReportParts {
+        contract: leak(v["contract"].as_str()?),
+        contracts: names(&v["contracts"])?,
+        report: unhex(v["report"].as_str()?)?,
+        runs: if v["runs"].is_null() { None } else { Some(names(&v["runs"])?) },
+        rooms: names(&v["rooms"])?,
+    })
+}
+
+fn statement_parts(v: &Value) -> Option<StatementParts> {
+    Some(StatementParts { contract: leak(v["contract"].as_str()?), statement: unhex(v["statement"].as_str()?)?, runs: names(&v["runs"])?, ledgers: names(&v["ledgers"])? })
+}
+
+/// A vector of the corpus as its verification document, its parts resolved by name.
+pub fn document(doc: &Value, v: &Value) -> Option<Value> {
+    let p = pools_of(doc)?;
+    let has = |pool: &BTreeMap<String, Value>, ns: &[&str]| ns.iter().all(|n| pool.contains_key(*n));
+    let rp = report_parts(&v["report"])?;
+    if !has(&p.contracts, &[rp.contract]) || !has(&p.contracts, &rp.contracts) || !has(&p.runs, rp.runs.as_deref().unwrap_or(&[])) || !has(&p.rooms, &rp.rooms) {
+        return None;
+    }
+    match v["kind"].as_str()? {
+        "report" => Some(p.report_document(&rp, true)),
+        "check" => {
+            let reported = v["reported"].as_str()?;
+            let sp = if v["statement"].is_null() { None } else { Some(statement_parts(&v["statement"])?) };
+            if !has(&p.reported, &[reported]) || sp.as_ref().is_some_and(|s| !has(&p.contracts, &[s.contract]) || !has(&p.runs, &s.runs) || !has(&p.ledgers, &s.ledgers)) {
+                return None;
+            }
+            Some(p.check_document(&rp, reported, sp.as_ref(), Some(&unhex(v["check"].as_str()?)?)))
+        }
+        _ => None,
+    }
+}
+
+/// The outcome a vector's document gets.
+pub fn outcome_of(v: &Value, d: &Value) -> Value {
+    if v["kind"] == "check" { check_outcome_json(&verify_check(d)) } else { outcome_json(&super::verify(d)) }
+}
+
+/// The failures: every vector whose stated outcome is not the one this module gives.
+pub fn verify(text: &str) -> Vec<String> {
+    let doc: Value = match serde_json::from_str(text) {
+        Ok(d) => d,
+        Err(e) => return vec![format!("vectors.json: {e}")],
+    };
+    let mut fails = Vec::new();
+    for v in doc["vectors"].as_array().into_iter().flatten() {
+        let name = v["name"].as_str().unwrap_or("?");
+        let Some(d) = document(&doc, v) else {
+            fails.push(format!("{name}: the vector does not read"));
+            continue;
+        };
+        let got = outcome_of(v, &d);
+        if got != v["outcome"] {
+            fails.push(format!("{name}: the outcome is {got}, the corpus states {}", v["outcome"]));
+        }
+    }
+    fails
+}
diff --git a/wai/wai-rs/src/opportunity_report/reported.rs b/wai/wai-rs/src/opportunity_report/reported.rs
new file mode 100644
index 000000000..b9fe460b7
--- /dev/null
+++ b/wai/wai-rs/src/opportunity_report/reported.rs
@@ -0,0 +1,341 @@
+//! The reported statement (extensions/opportunity-report.md §9): what a platform reports it
+//! counted, in a documented JSON form (§9.1) or CSV form (§9.2), held to §9.3's rules. It is an
+//! input and never evidence: a check names it by the digest of its bytes.
+
+use serde_json::{Map, Value};
+
+/// The forms (§10.1 `form`).
+pub mod form {
+    pub const JSON: u8 = 1;
+    pub const CSV: u8 = 2;
+
+    pub fn name(f: u8) -> &'static str {
+        match f {
+            JSON => "json",
+            CSV => "csv",
+            _ => "?",
+        }
+    }
+
+    pub fn code(s: &str) -> Option<u8> {
+        match s {
+            "json" => Some(JSON),
+            "csv" => Some(CSV),
+            _ => None,
+        }
+    }
+}
+
+/// The bases of the reported revenue (§9.1).
+pub mod basis {
+    pub const GROSS: u8 = 1;
+    pub const SHARE: u8 = 2;
+
+    pub fn name(b: u8) -> &'static str {
+        match b {
+            GROSS => "gross",
+            SHARE => "share",
+            _ => "?",
+        }
+    }
+
+    pub fn code(s: &str) -> Option<u8> {
+        match s {
+            "gross" => Some(GROSS),
+            "share" => Some(SHARE),
+            _ => None,
+        }
+    }
+}
+
+/// A day's figures: the day as written, the start of its span, and its figures.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Day {
+    pub day: String,
+    pub start: u64,
+    pub impressions: u64,
+    pub revenue: u64,
+}
+
+/// A programme's figures.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Programme {
+    pub asset: Vec<u8>,
+    pub impressions: u64,
+    pub revenue: u64,
+}
+
+/// A reported statement, read.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Reported {
+    pub channel: Vec<u8>,
+    pub start: u64,
+    pub end: u64,
+    pub currency: [u8; 3],
+    pub basis: u8,
+    pub impressions: u64,
+    pub revenue: u64,
+    pub days: Vec<Day>,
+    pub programmes: Vec<Programme>,
+}
+
+/// A day's span, in microseconds.
+pub const DAY_US: u64 = 86_400_000_000;
+
+fn days_from_civil(y: i64, m: i64, d: i64) -> i64 {
+    let y = if m <= 2 { y - 1 } else { y };
+    let era = y.div_euclid(400);
+    let yoe = y - era * 400;
+    let mp = (m + 9) % 12;
+    let doy = (153 * mp + 2) / 5 + d - 1;
+    let doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+    era * 146_097 + doe - 719_468
+}
+
+/// The start of a day written `YYYY-MM-DD` (§2), a date of the Gregorian calendar from 1970 to
+/// 9999, in microseconds since 1970.
+pub fn day_start(s: &str) -> Option<u64> {
+    let b = s.as_bytes();
+    let digits = |r: std::ops::Range<usize>| -> Option<i64> { b[r].iter().try_fold(0i64, |a, c| c.is_ascii_digit().then(|| a * 10 + (c - b'0') as i64)) };
+    if b.len() != 10 || b[4] != b'-' || b[7] != b'-' {
+        return None;
+    }
+    let (y, m, d) = (digits(0..4)?, digits(5..7)?, digits(8..10)?);
+    let leap = (y % 4 == 0 && y % 100 != 0) || y % 400 == 0;
+    let month_days = [31, if leap { 29 } else { 28 }, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+    if !(1970..=9999).contains(&y) || !(1..=12).contains(&m) || d < 1 || d > month_days[(m - 1) as usize] {
+        return None;
+    }
+    Some(days_from_civil(y, m, d) as u64 * DAY_US)
+}
+
+/// A JSON integer from 0 to 2^64 − 1.
+fn int(v: &Value) -> Option<u64> {
+    v.as_u64()
+}
+
+fn members(o: &Map<String, Value>, required: &[&str], optional: &[&str]) -> bool {
+    required.iter().all(|k| o.contains_key(*k)) && o.keys().all(|k| required.contains(&k.as_str()) || optional.contains(&k.as_str()))
+}
+
+fn from_json(v: &Value) -> Option<Reported> {
+    let o = v.as_object()?;
+    if !members(o, &["channel", "start", "end", "currency", "basis", "impressions", "revenue"], &["days", "programmes"]) {
+        return None;
+    }
+    let mut days = Vec::new();
+    let list = |k: &str| -> Option<&[Value]> { o.get(k).map_or(Some(&[][..]), |v| v.as_array().map(Vec::as_slice)) };
+    for d in list("days")? {
+        let d = d.as_object()?;
+        if !members(d, &["day", "impressions", "revenue"], &[]) {
+            return None;
+        }
+        let day = d["day"].as_str()?.to_string();
+        days.push(Day { start: day_start(&day)?, day, impressions: int(&d["impressions"])?, revenue: int(&d["revenue"])? });
+    }
+    let mut programmes = Vec::new();
+    for p in list("programmes")? {
+        let p = p.as_object()?;
+        if !members(p, &["asset", "impressions", "revenue"], &[]) {
+            return None;
+        }
+        programmes.push(Programme { asset: p["asset"].as_str()?.as_bytes().to_vec(), impressions: int(&p["impressions"])?, revenue: int(&p["revenue"])? });
+    }
+    Some(Reported {
+        channel: o["channel"].as_str()?.as_bytes().to_vec(),
+        start: int(&o["start"])?,
+        end: int(&o["end"])?,
+        currency: o["currency"].as_str()?.as_bytes().try_into().ok()?,
+        basis: basis::code(o["basis"].as_str()?)?,
+        impressions: int(&o["impressions"])?,
+        revenue: int(&o["revenue"])?,
+        days,
+        programmes,
+    })
+}
+
+/// RFC 4180 records (§9.2): each ended by CRLF or LF, the last line break optional.
+fn records(text: &str) -> Option<Vec<Vec<String>>> {
+    let b = text.as_bytes();
+    let n = b.len();
+    let mut out = Vec::new();
+    let mut p = 0;
+    if n == 0 {
+        return None;
+    }
+    loop {
+        let mut rec = Vec::new();
+        loop {
+            let mut f = Vec::new();
+            if p < n && b[p] == b'"' {
+                p += 1;
+                loop {
+                    if p >= n {
+                        return None;
+                    }
+                    if b[p] == b'"' {
+                        if p + 1 < n && b[p + 1] == b'"' {
+                            f.push(b'"');
+                            p += 2;
+                        } else {
+                            p += 1;
+                            break;
+                        }
+                    } else {
+                        f.push(b[p]);
+                        p += 1;
+                    }
+                }
+            } else {
+                while p < n && !matches!(b[p], b',' | b'\r' | b'\n') {
+                    if b[p] == b'"' {
+                        return None;
+                    }
+                    f.push(b[p]);
+                    p += 1;
+                }
+            }
+            rec.push(String::from_utf8(f).ok()?);
+            if p < n && b[p] == b',' {
+                p += 1;
+                continue;
+            }
+            break;
+        }
+        out.push(rec);
+        if p == n {
+            break;
+        }
+        match b[p] {
+            b'\r' if p + 1 < n && b[p + 1] == b'\n' => p += 2,
+            b'\n' => p += 1,
+            _ => return None,
+        }
+        if p == n {
+            break;
+        }
+    }
+    Some(out)
+}
+
+/// An integer of §9.2: `0`, or a digit 1 to 9 and digits, at most 2^64 − 1.
+fn csv_int(s: &str) -> Option<u64> {
+    let b = s.as_bytes();
+    if b.is_empty() || !b.iter().all(u8::is_ascii_digit) || (b.len() > 1 && b[0] == b'0') {
+        return None;
+    }
+    s.parse().ok()
+}
+
+fn from_csv(text: &str) -> Option<Reported> {
+    let recs = records(text)?;
+    if recs.iter().any(|r| r.len() != 4) {
+        return None;
+    }
+    let mut it = recs.iter();
+    if it.next()? != &["scope", "key", "impressions", "revenue"] {
+        return None;
+    }
+    let mut meta = |name: &str| -> Option<String> {
+        let r = it.next()?;
+        (r[0] == name && r[2].is_empty() && r[3].is_empty()).then(|| r[1].clone())
+    };
+    let channel = meta("channel")?;
+    let start = csv_int(&meta("start")?)?;
+    let end = csv_int(&meta("end")?)?;
+    let currency = meta("currency")?;
+    let basis_ = meta("basis")?;
+    let rest: Vec<&Vec<String>> = it.collect();
+    let (period, rows) = rest.split_first()?;
+    if period[0] != "period" || !period[1].is_empty() {
+        return None;
+    }
+    let mut days = Vec::new();
+    let mut programmes = Vec::new();
+    let mut in_programmes = false;
+    for r in rows {
+        let (impressions, revenue) = (csv_int(&r[2])?, csv_int(&r[3])?);
+        match r[0].as_str() {
+            "day" if !in_programmes => days.push(Day { start: day_start(&r[1])?, day: r[1].clone(), impressions, revenue }),
+            "programme" => {
+                in_programmes = true;
+                programmes.push(Programme { asset: r[1].as_bytes().to_vec(), impressions, revenue });
+            }
+            _ => return None,
+        }
+    }
+    Some(Reported {
+        channel: channel.into_bytes(),
+        start,
+        end,
+        currency: currency.as_bytes().try_into().ok()?,
+        basis: basis::code(&basis_)?,
+        impressions: csv_int(&period[2])?,
+        revenue: csv_int(&period[3])?,
+        days,
+        programmes,
+    })
+}
+
+/// §9.3's rules, short of the binding to the contract and the report.
+fn rules(r: &Reported) -> bool {
+    let text = |t: &[u8]| (1..=1024).contains(&t.len());
+    text(&r.channel)
+        && r.currency.iter().all(u8::is_ascii_uppercase)
+        && r.start < r.end
+        && r.days.iter().all(|d| r.start <= d.start && d.start.checked_add(DAY_US).is_some_and(|e| e <= r.end))
+        && r.days.windows(2).all(|w| w[0].start < w[1].start)
+        && r.programmes.iter().all(|p| text(&p.asset))
+        && r.programmes.windows(2).all(|w| w[0].asset < w[1].asset)
+}
+
+/// Read a reported statement of a form (§9); `None` is `reported_invalid`.
+pub fn read(form_: u8, text: &str) -> Option<Reported> {
+    let r = match form_ {
+        form::JSON => from_json(&serde_json::from_str(text).ok()?)?,
+        form::CSV => from_csv(text)?,
+        _ => return None,
+    };
+    rules(&r).then_some(r)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn days() {
+        assert_eq!(day_start("1970-01-01"), Some(0));
+        assert_eq!(day_start("2026-10-16"), Some(1_792_108_800_000_000));
+        assert_eq!(day_start("2024-02-29"), Some(19_782 * DAY_US));
+        assert_eq!(day_start("2026-02-29"), None);
+        assert_eq!(day_start("1969-12-31"), None);
+        assert_eq!(day_start("2026-1-016"), None);
+        assert_eq!(day_start("2026-13-01"), None);
+    }
+
+    #[test]
+    fn the_two_forms_read_alike() {
+        let json = r#"{"channel":"fast-9","start":0,"end":172800000000,"currency":"EUR","basis":"share","impressions":5,"revenue":7,
+            "days":[{"day":"1970-01-01","impressions":2,"revenue":3},{"day":"1970-01-02","impressions":3,"revenue":4}],
+            "programmes":[{"asset":"a,\"b\"","impressions":5,"revenue":7}]}"#;
+        let csv = "scope,key,impressions,revenue\r\nchannel,fast-9,,\r\nstart,0,,\r\nend,172800000000,,\r\ncurrency,EUR,,\r\nbasis,share,,\r\nperiod,,5,7\r\nday,1970-01-01,2,3\nday,1970-01-02,3,4\nprogramme,\"a,\"\"b\"\"\",5,7";
+        let a = read(form::JSON, json).expect("the JSON form reads");
+        assert_eq!(read(form::CSV, csv), Some(a));
+    }
+
+    #[test]
+    fn what_does_not_read() {
+        let base = "scope,key,impressions,revenue\nchannel,fast-9,,\nstart,0,,\nend,86400000000,,\ncurrency,EUR,,\nbasis,gross,,\nperiod,,5,7\n";
+        assert!(read(form::CSV, base).is_some());
+        assert!(read(form::CSV, &base.replace("period,,5", "period,,05")).is_none());
+        assert!(read(form::CSV, &base.replace("basis,gross", "basis,net")).is_none());
+        assert!(read(form::CSV, &format!("{base}day,1970-01-02,1,1\n")).is_none(), "a day past the period");
+        assert!(read(form::CSV, &format!("{base}programme,b,1,1\nprogramme,a,1,1\n")).is_none(), "programmes out of order");
+        assert!(read(form::CSV, &format!("{base}programme,a,1,1\nday,1970-01-01,1,1\n")).is_none(), "a day after a programme");
+        assert!(read(form::CSV, &base.replace("fast-9", "fa\"st")).is_none(), "a bare quote");
+        assert!(read(form::CSV, &format!("{base}\n")).is_none(), "an empty record");
+        assert!(read(form::JSON, r#"{"channel":"x","start":0,"end":1,"currency":"EUR","basis":"gross","impressions":1.0,"revenue":1}"#).is_none());
+        assert!(read(form::JSON, r#"{"channel":"x","start":0,"end":1,"currency":"EUR","basis":"gross","impressions":1,"revenue":1,"note":""}"#).is_none());
+    }
+}
diff --git a/wai/wai-rs/src/opportunity_report/section.rs b/wai/wai-rs/src/opportunity_report/section.rs
new file mode 100644
index 000000000..918b17cad
--- /dev/null
+++ b/wai/wai-rs/src/opportunity_report/section.rs
@@ -0,0 +1,476 @@
+//! The subset of an SCTE 35-1 `splice_info_section()` the opportunity report reads
+//! (extensions/opportunity-report.md §5): the CRC, the header, `splice_insert()`,
+//! `time_signal()` and `splice_null()`, and the segmentation descriptors of the descriptor loop,
+//! for what a section states (§5.2): its id, its duration and its slots. A section is read only as
+//! far as this; another command or descriptor is passed over whole.
+//!
+//! [`write`] builds sections from their fields for the corpus.
+
+/// The MPEG-2 CRC (ISO/IEC 13818-1 Annex A): polynomial 0x04C11DB7, register preset to all ones,
+/// no reflection, no final inversion.
+pub fn crc32(b: &[u8]) -> u32 {
+    let mut c: u32 = 0xFFFF_FFFF;
+    for &x in b {
+        c ^= (x as u32) << 24;
+        for _ in 0..8 {
+            c = if c & 0x8000_0000 != 0 { (c << 1) ^ 0x04C1_1DB7 } else { c << 1 };
+        }
+    }
+    c
+}
+
+/// The command types this text reads.
+pub mod command {
+    pub const SPLICE_NULL: u8 = 0x00;
+    pub const SPLICE_INSERT: u8 = 0x05;
+    pub const TIME_SIGNAL: u8 = 0x06;
+}
+
+/// The segmentation types whose start makes an out (cue-injection §6.2).
+pub const OPENING: [u8; 5] = [0x22, 0x30, 0x32, 0x34, 0x36];
+/// The placement opportunity starts.
+pub const PLACEMENT: [u8; 2] = [0x34, 0x36];
+/// The types that may carry the sub-segment fields (SCTE 35-1 Table 20).
+pub const SUB_SEGMENTED: [u8; 8] = [0x30, 0x32, 0x34, 0x36, 0x38, 0x3A, 0x44, 0x46];
+
+/// A segmentation descriptor, as far as §5.1 reads it.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Segmentation {
+    pub event_id: u32,
+    pub cancelled: bool,
+    pub duration: Option<u64>,
+    pub type_id: u8,
+    /// (`sub_segment_num`, `sub_segments_expected`), when carried.
+    pub sub: Option<(u8, u8)>,
+}
+
+/// What a section states (§5.2), and what §5.3 holds it to.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct States {
+    /// `splice_command_type`, or `None` for an encrypted section.
+    pub command: Option<u8>,
+    /// A `splice_insert()`: (its cancel indicator, its `out_of_network_indicator`).
+    pub insert: Option<(bool, bool)>,
+    pub id: Option<u32>,
+    pub duration: Option<u64>,
+    pub slots: Option<u64>,
+}
+
+impl States {
+    fn nothing(command: Option<u8>) -> States {
+        States { command, insert: None, id: None, duration: None, slots: None }
+    }
+
+    /// The command's name, as the outcome states it.
+    pub fn command_name(&self) -> &'static str {
+        match self.command {
+            None => "encrypted",
+            Some(command::SPLICE_INSERT) => "splice_insert",
+            Some(command::TIME_SIGNAL) => "time_signal",
+            Some(command::SPLICE_NULL) => "splice_null",
+            Some(_) => "other",
+        }
+    }
+}
+
+/// A big-endian bit cursor over `b[..end]`; running out is a refusal.
+struct Bits<'a> {
+    b: &'a [u8],
+    /// The position, in bits.
+    at: usize,
+    /// The end, in bytes.
+    end: usize,
+}
+
+impl Bits<'_> {
+    fn take(&mut self, n: usize) -> Result<u64, ()> {
+        if self.at + n > self.end * 8 {
+            return Err(());
+        }
+        let mut v: u64 = 0;
+        for _ in 0..n {
+            let bit = (self.b[self.at / 8] >> (7 - self.at % 8)) & 1;
+            v = (v << 1) | bit as u64;
+            self.at += 1;
+        }
+        Ok(v)
+    }
+    fn skip(&mut self, n_bytes: usize) -> Result<(), ()> {
+        if self.at / 8 + n_bytes > self.end {
+            return Err(());
+        }
+        self.at += 8 * n_bytes;
+        Ok(())
+    }
+    fn byte_pos(&self) -> usize {
+        self.at / 8
+    }
+}
+
+/// A `splice_time()`: one byte, or five with `pts_time`.
+fn splice_time(r: &mut Bits) -> Result<(), ()> {
+    if r.take(1)? == 1 {
+        r.take(6)?;
+        r.take(33)?;
+    } else {
+        r.take(7)?;
+    }
+    Ok(())
+}
+
+/// `splice_insert()`: (cancel, out_of_network, splice_event_id, break duration).
+fn splice_insert(r: &mut Bits) -> Result<(bool, bool, u32, Option<u64>), ()> {
+    let id = r.take(32)? as u32;
+    let cancel = r.take(1)? == 1;
+    r.take(7)?;
+    if cancel {
+        return Ok((true, false, id, None));
+    }
+    let out = r.take(1)? == 1;
+    let program = r.take(1)? == 1;
+    let duration_flag = r.take(1)? == 1;
+    let immediate = r.take(1)? == 1;
+    r.take(4)?;
+    if program && !immediate {
+        splice_time(r)?;
+    }
+    if !program {
+        let n = r.take(8)?;
+        for _ in 0..n {
+            r.take(8)?;
+            if !immediate {
+                splice_time(r)?;
+            }
+        }
+    }
+    let duration = if duration_flag {
+        r.take(1)?;
+        r.take(6)?;
+        Some(r.take(33)?)
+    } else {
+        None
+    };
+    r.take(16)?;
+    r.take(8)?;
+    r.take(8)?;
+    Ok((false, out, id, duration))
+}
+
+/// A segmentation descriptor's body after its identifier, filling `[from, to)` exactly.
+fn segmentation(b: &[u8], from: usize, to: usize) -> Result<Segmentation, ()> {
+    let mut r = Bits { b, at: from * 8, end: to };
+    let event_id = r.take(32)? as u32;
+    let cancelled = r.take(1)? == 1;
+    r.take(7)?;
+    if cancelled {
+        return if r.byte_pos() == to { Ok(Segmentation { event_id, cancelled, duration: None, type_id: 0, sub: None }) } else { Err(()) };
+    }
+    let program = r.take(1)? == 1;
+    let duration_flag = r.take(1)? == 1;
+    r.take(6)?;
+    if !program {
+        let n = r.take(8)?;
+        r.skip(6 * n as usize)?;
+    }
+    let duration = if duration_flag { Some(r.take(40)?) } else { None };
+    r.take(8)?;
+    let upid_len = r.take(8)?;
+    r.skip(upid_len as usize)?;
+    let type_id = r.take(8)? as u8;
+    r.take(8)?;
+    r.take(8)?;
+    let left = to - r.byte_pos();
+    let sub = match left {
+        0 => None,
+        2 if SUB_SEGMENTED.contains(&type_id) => Some((r.take(8)? as u8, r.take(8)? as u8)),
+        _ => return Err(()),
+    };
+    Ok(Segmentation { event_id, cancelled, duration, type_id, sub })
+}
+
+/// A section that does not read (§5.1): `cue_section_invalid`.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Invalid;
+
+/// Read a section (§5.1) for what it states (§5.2).
+pub fn read(s: &[u8]) -> Result<States, Invalid> {
+    read_section(s).map_err(|()| Invalid)
+}
+
+fn read_section(s: &[u8]) -> Result<States, ()> {
+    let n = s.len();
+    if n < 20 {
+        return Err(());
+    }
+    let crc_at = n - 4;
+    if crc32(&s[..crc_at]) != u32::from_be_bytes(s[crc_at..].try_into().expect("4 bytes")) {
+        return Err(());
+    }
+    if s[3] != 0 {
+        return Err(());
+    }
+    if s[4] >> 7 == 1 {
+        return Ok(States::nothing(None));
+    }
+    let cmd_len = (((s[11] & 0x0F) as usize) << 8) | s[12] as usize;
+    let cmd = s[13];
+    let readable = matches!(cmd, command::SPLICE_INSERT | command::TIME_SIGNAL | command::SPLICE_NULL);
+    if cmd_len == 0xFFF && !readable {
+        return Ok(States::nothing(Some(cmd)));
+    }
+    let end = if cmd_len == 0xFFF { crc_at } else { 14 + cmd_len };
+    if end > crc_at {
+        return Err(());
+    }
+    let mut r = Bits { b: s, at: 14 * 8, end };
+    let mut st = States::nothing(Some(cmd));
+    match cmd {
+        command::SPLICE_INSERT => {
+            let (cancel, out, id, duration) = splice_insert(&mut r)?;
+            st.insert = Some((cancel, out));
+            st.id = Some(id);
+            st.duration = duration;
+        }
+        command::TIME_SIGNAL => splice_time(&mut r)?,
+        command::SPLICE_NULL => {}
+        _ => r.at = end * 8,
+    }
+    let cmd_end = r.byte_pos();
+    if cmd_len != 0xFFF && cmd_end != end {
+        return Err(());
+    }
+    if cmd_end + 2 > crc_at {
+        return Err(());
+    }
+    let loop_len = u16::from_be_bytes([s[cmd_end], s[cmd_end + 1]]) as usize;
+    let mut p = cmd_end + 2;
+    if p + loop_len != crc_at {
+        return Err(());
+    }
+    let mut segs = Vec::new();
+    while p < crc_at {
+        if p + 2 > crc_at {
+            return Err(());
+        }
+        let (tag, len) = (s[p], s[p + 1] as usize);
+        let body = p + 2;
+        if body + len > crc_at {
+            return Err(());
+        }
+        if tag == 0x02 && len >= 4 && &s[body..body + 4] == b"CUEI" {
+            segs.push(segmentation(s, body + 4, body + len)?);
+        }
+        p = body + len;
+    }
+    let live = |x: &&Segmentation| !x.cancelled;
+    if cmd == command::TIME_SIGNAL
+        && let Some(o) = segs.iter().filter(live).find(|x| OPENING.contains(&x.type_id))
+    {
+        st.id = Some(o.event_id);
+        st.duration = o.duration;
+    }
+    st.slots = segs.iter().filter(live).find(|x| PLACEMENT.contains(&x.type_id)).and_then(|x| x.sub).map(|(_, e)| e as u64).filter(|e| *e > 0);
+    Ok(st)
+}
+
+// ---------------------------------------------------------------------------------------
+// Writing, for the corpus
+// ---------------------------------------------------------------------------------------
+
+/// A big-endian bit writer.
+#[derive(Default)]
+struct Out {
+    b: Vec<u8>,
+    bits: usize,
+}
+
+impl Out {
+    fn put(&mut self, n: usize, v: u64) {
+        for i in (0..n).rev() {
+            if self.bits.is_multiple_of(8) {
+                self.b.push(0);
+            }
+            let bit = ((v >> i) & 1) as u8;
+            let last = self.b.len() - 1;
+            self.b[last] |= bit << (7 - self.bits % 8);
+            self.bits += 1;
+        }
+    }
+}
+
+/// A segmentation descriptor to write.
+#[derive(Clone, Debug)]
+pub struct SegmentationSpec {
+    pub event_id: u32,
+    pub cancelled: bool,
+    /// In 90 kHz ticks.
+    pub duration: Option<u64>,
+    pub type_id: u8,
+    pub sub: Option<(u8, u8)>,
+}
+
+/// A command to write.
+#[derive(Clone, Debug)]
+pub enum Command {
+    /// `splice_insert()`: id, cancel, out_of_network, and the break duration in ticks.
+    Insert { id: u32, cancel: bool, out: bool, duration: Option<u64> },
+    /// `time_signal()` at a `pts_time`.
+    TimeSignal { pts: u64 },
+}
+
+fn segmentation_bytes(d: &SegmentationSpec) -> Vec<u8> {
+    let mut o = Out::default();
+    o.put(32, u32::from_be_bytes(*b"CUEI") as u64);
+    o.put(32, d.event_id as u64);
+    o.put(1, d.cancelled as u64);
+    o.put(1, 1);
+    o.put(6, 0x3F);
+    if !d.cancelled {
+        o.put(1, 1); // program_segmentation_flag
+        o.put(1, d.duration.is_some() as u64);
+        o.put(1, 1); // delivery_not_restricted_flag
+        o.put(5, 0x1F);
+        if let Some(t) = d.duration {
+            o.put(40, t);
+        }
+        o.put(8, 0); // segmentation_upid_type: not used
+        o.put(8, 0); // segmentation_upid_length
+        o.put(8, d.type_id as u64);
+        o.put(8, 1); // segment_num
+        o.put(8, 1); // segments_expected
+        if let Some((n, e)) = d.sub {
+            o.put(8, n as u64);
+            o.put(8, e as u64);
+        }
+    }
+    let mut v = vec![0x02, o.b.len() as u8];
+    v.extend(o.b);
+    v
+}
+
+/// A section of one command and its segmentation descriptors, with its CRC.
+pub fn write(cmd: &Command, descriptors: &[SegmentationSpec]) -> Vec<u8> {
+    let mut c = Out::default();
+    let ty = match cmd {
+        Command::Insert { id, cancel, out, duration } => {
+            c.put(32, *id as u64);
+            c.put(1, *cancel as u64);
+            c.put(7, 0x7F);
+            if !cancel {
+                c.put(1, *out as u64);
+                c.put(1, 1); // program_splice_flag
+                c.put(1, duration.is_some() as u64);
+                c.put(1, 1); // splice_immediate_flag
+                c.put(1, 1); // event_id_compliance_flag
+                c.put(3, 0x7);
+                if let Some(t) = duration {
+                    c.put(1, 1);
+                    c.put(6, 0x3F);
+                    c.put(33, *t);
+                }
+                c.put(16, 1); // unique_program_id
+                c.put(8, 0); // avail_num
+                c.put(8, 0); // avails_expected
+            }
+            command::SPLICE_INSERT
+        }
+        Command::TimeSignal { pts } => {
+            c.put(1, 1);
+            c.put(6, 0x3F);
+            c.put(33, *pts);
+            command::TIME_SIGNAL
+        }
+    };
+    let mut loop_ = Vec::new();
+    for d in descriptors {
+        loop_.extend(segmentation_bytes(d));
+    }
+    let mut body = Out::default();
+    body.put(8, 0); // protocol_version
+    body.put(1, 0); // encrypted_packet
+    body.put(6, 0); // encryption_algorithm
+    body.put(33, 0); // pts_adjustment
+    body.put(8, 0xFF); // cw_index
+    body.put(12, 0xFFF); // tier
+    body.put(12, c.b.len() as u64);
+    body.put(8, ty as u64);
+    let mut rest = body.b;
+    rest.extend(&c.b);
+    rest.extend((loop_.len() as u16).to_be_bytes());
+    rest.extend(loop_);
+    let section_length = rest.len() + 4;
+    let mut s = vec![0xFC, 0x30 | ((section_length >> 8) as u8 & 0x0F), section_length as u8];
+    s.extend(rest);
+    let crc = crc32(&s);
+    s.extend(crc.to_be_bytes());
+    s
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// ANSI/SCTE 35-1 §14.1's sample, as cue-injection §5.7 holds it: a `time_signal()` with a
+    /// Provider Placement Opportunity Start of 307 s.
+    const SAMPLE: &str = "fc3034000000000000fffff00506fe72bd0050001e021c435545494800008e7fcf0001a599b00808000000002ca0a18a3402009ac9d17e";
+
+    fn unhex(s: &str) -> Vec<u8> {
+        (0..s.len()).step_by(2).map(|i| u8::from_str_radix(&s[i..i + 2], 16).unwrap()).collect()
+    }
+
+    #[test]
+    fn the_crc_of_the_standards_sample() {
+        let s = unhex(SAMPLE);
+        let n = s.len();
+        assert_eq!(crc32(&s[..n - 4]), u32::from_be_bytes(s[n - 4..].try_into().unwrap()));
+    }
+
+    #[test]
+    fn the_standards_sample_states_its_opportunity() {
+        let st = read(&unhex(SAMPLE)).expect("the sample reads");
+        assert_eq!(st.command, Some(command::TIME_SIGNAL));
+        assert_eq!(st.id, Some(0x4800_008e));
+        // 307 s at 90 kHz.
+        assert_eq!(st.duration, Some(307 * 90_000));
+        // Its descriptor (28 bytes) ends at `segments_expected`: it carries no sub-segment
+        // fields, so it states no slots.
+        assert_eq!(st.slots, None);
+    }
+
+    #[test]
+    fn written_sections_read_back() {
+        let s = write(&Command::Insert { id: 7, cancel: false, out: true, duration: Some(5_400_000) }, &[]);
+        let st = read(&s).unwrap();
+        assert_eq!((st.id, st.duration, st.slots, st.insert), (Some(7), Some(5_400_000), None, Some((false, true))));
+        let d = SegmentationSpec { event_id: 9, cancelled: false, duration: Some(8_100_000), type_id: 0x34, sub: Some((1, 3)) };
+        let s = write(&Command::TimeSignal { pts: 12_345 }, &[d]);
+        let st = read(&s).unwrap();
+        assert_eq!((st.id, st.duration, st.slots), (Some(9), Some(8_100_000), Some(3)));
+    }
+
+    #[test]
+    fn a_cancelled_descriptor_states_nothing() {
+        let c = SegmentationSpec { event_id: 3, cancelled: true, duration: None, type_id: 0, sub: None };
+        let d = SegmentationSpec { event_id: 4, cancelled: false, duration: None, type_id: 0x36, sub: Some((1, 2)) };
+        let st = read(&write(&Command::TimeSignal { pts: 0 }, &[c, d])).unwrap();
+        assert_eq!((st.id, st.slots), (Some(4), Some(2)));
+    }
+
+    #[test]
+    fn a_damaged_section_is_refused() {
+        let s = write(&Command::TimeSignal { pts: 1 }, &[]);
+        let mut crc = s.clone();
+        let n = crc.len();
+        crc[n - 1] ^= 1;
+        assert!(read(&crc).is_err());
+        assert!(read(&s[..19]).is_err());
+        // A descriptor loop that runs past the CRC, the CRC made good again.
+        let mut long = s.clone();
+        let at = long.len() - 6;
+        long[at + 1] = 9;
+        let n = long.len();
+        let c = crc32(&long[..n - 4]);
+        long[n - 4..].copy_from_slice(&c.to_be_bytes());
+        assert!(read(&long).is_err());
+    }
+}
diff --git a/wai/wai-rs/src/revenue_share.rs b/wai/wai-rs/src/revenue_share.rs
index c0b9e7b57..037b54c24 100644
--- a/wai/wai-rs/src/revenue_share.rs
+++ b/wai/wai-rs/src/revenue_share.rs
@@ -906,8 +906,9 @@ pub struct Evidence {
     pub impressions: Vec<Impression>,
 }
 
-/// §8.2 step 4: the runs.
-fn the_runs(c: &Contract, runs: &[Value]) -> Result<Vec<ChannelReceipt>, Refusal> {
+/// §8.2 step 4: the runs. The opportunity report (extensions/opportunity-report.md §3.2) reads
+/// runs as this step does.
+pub(crate) fn the_runs(c: &Contract, runs: &[Value]) -> Result<Vec<ChannelReceipt>, Refusal> {
     let mut out: Vec<ChannelReceipt> = Vec::with_capacity(runs.len());
     for (k, v) in runs.iter().enumerate() {
         let at = || json!(["run", k]);
@@ -958,8 +959,9 @@ fn the_ledgers(c: &Contract, start: u64, end: u64, docs: &[Value]) -> Result<Vec
     Ok(out)
 }
 
-/// The asset an instant's entry gives (§6.2): a programme's own, or by the rule.
-fn asset_at(schedule: &[crate::wai_video_channel::ScheduleEntry], e: usize, rule_: u8) -> Option<&str> {
+/// The asset an instant's entry gives (§6.2): a programme's own, or by the rule. The opportunity
+/// report attributes a break by it (extensions/opportunity-report.md §6).
+pub(crate) fn asset_at(schedule: &[crate::wai_video_channel::ScheduleEntry], e: usize, rule_: u8) -> Option<&str> {
     let programme = |x: &&crate::wai_video_channel::ScheduleEntry| x.kind == EntryKind::Program;
     if schedule[e].kind == EntryKind::Program {
         return Some(&schedule[e].asset_id);
diff --git a/wai/wai-rs/tests/cli_ops.rs b/wai/wai-rs/tests/cli_ops.rs
index 62e3b900f..898521b54 100644
--- a/wai/wai-rs/tests/cli_ops.rs
+++ b/wai/wai-rs/tests/cli_ops.rs
@@ -449,6 +449,23 @@ fn samples(d: &Path, origin_port: u16) -> Vec<(&'static str, Vec<String>, bool)>
             true,
         ));
     }
+    #[cfg(feature = "opportunity_report")]
+    {
+        // The opportunity report: owner B's report of the opportunity corpus's day, recomputed
+        // here from its runs and room, and the check of B's reported statement beside it.
+        use wai::opportunity_report::corpus;
+        let hexs = |b: &[u8]| b.iter().map(|x| format!("{x:02x}")).collect::<String>();
+        let w = corpus::world().unwrap();
+        let b = &w.reports["owner_b"];
+        std::fs::write(d.join("owner-b.key"), hexs(&corpus::key("owner-b").to_bytes())).unwrap();
+        std::fs::write(d.join("opp-inputs.json"), w.pools.report_document(b, false).to_string()).unwrap();
+        std::fs::write(d.join("opp-report.json"), w.pools.report_document(b, true).to_string()).unwrap();
+        std::fs::write(d.join("reported.json"), w.pools.reported["b_programmes"]["text"].as_str().unwrap()).unwrap();
+        let party = hexs(&corpus::pk("owner-b"));
+        let (start, end) = (corpus::DAY16.to_string(), corpus::DAY17.to_string());
+        more.push(("opportunity.create", s(&["opportunity", "create", "opp-inputs.json", "--party", &party, "--start", &start, "--end", &end, "--key", "owner-b.key", "--out", "b.wai-opportunity.json"]), true));
+        more.push(("statement.check", s(&["statement", "check", "opp-report.json", "reported.json", "--key", "owner-b.key", "--out", "b.wai-check.json"]), true));
+    }
     #[cfg(feature = "generate")]
     {
         let model = wai_dir().join("wai-rs/tests/vectors/generate/generate_spectral_model.json");
diff --git a/wai/wai-rs/tests/opportunity_report.rs b/wai/wai-rs/tests/opportunity_report.rs
new file mode 100644
index 000000000..c0a9faf80
--- /dev/null
+++ b/wai/wai-rs/tests/opportunity_report.rs
@@ -0,0 +1,173 @@
+//! `wai.delivery.opportunity` (extensions/opportunity-report.md): the committed corpus
+//! `live-conformance/opportunity/vectors.json` regenerates byte for byte from its seeds and is the
+//! only file there besides its README; every vector gets the outcome it states; every reason the
+//! extension adds and every code it reuses refuses a vector; §13 lists exactly the reasons the
+//! reference reports; and the worked example of §14: a channel's day of two owners, signed cues and
+//! program-as-run, a reported statement that under-reports one owner's breaks, and the check that
+//! shows it, computed and then recomputed from the public records alone.
+#![cfg(feature = "opportunity_report")]
+
+use std::collections::{BTreeMap, BTreeSet};
+use std::path::PathBuf;
+
+use serde_json::{Value, json};
+use wai::opportunity_report::{self as opp, Reason, corpus, scope};
+
+fn wai_dir() -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("..")
+}
+
+fn read(p: &str) -> String {
+    std::fs::read_to_string(wai_dir().join(p)).unwrap_or_else(|e| panic!("{p}: {e}"))
+}
+
+fn committed() -> String {
+    read("live-conformance/opportunity/vectors.json")
+}
+
+fn doc() -> Value {
+    serde_json::from_str(&committed()).expect("the corpus is JSON")
+}
+
+#[test]
+fn the_committed_corpus_regenerates_from_its_seeds() {
+    let generated = corpus::generate().expect("the corpus generates");
+    assert!(committed() == generated, "live-conformance/opportunity/vectors.json differs from `wai_opportunity_vectors gen`");
+    let mut files: Vec<String> = std::fs::read_dir(wai_dir().join("live-conformance/opportunity")).unwrap().flatten().map(|e| e.file_name().to_string_lossy().into_owned()).collect();
+    files.sort();
+    assert_eq!(files, ["README.md", "vectors.json"]);
+}
+
+#[test]
+fn every_vector_gets_its_stated_outcome() {
+    let fails = corpus::verify(&committed());
+    assert!(fails.is_empty(), "{}", fails.join("\n"));
+}
+
+/// Every reason this extension adds and every code it reuses refuses a vector, and the texts it
+/// delegates to refuse one each at their own places.
+#[test]
+fn the_corpus_covers_every_reason_and_case() {
+    let d = doc();
+    let vectors = d["vectors"].as_array().unwrap();
+    let seen: BTreeSet<&str> = vectors.iter().filter_map(|v| v["outcome"]["reason"].as_str()).collect();
+    for r in Reason::ALL {
+        assert!(seen.contains(r.code()), "nothing in the corpus is refused {r}");
+    }
+    for r in Reason::REUSED {
+        assert!(seen.contains(r), "nothing in the corpus is refused {r}");
+    }
+    let get = |n: &str| vectors.iter().find(|v| v["name"] == n).unwrap_or_else(|| panic!("no vector {n}"))["outcome"].clone();
+    assert_eq!(get("contract_offered")["reason"], "not_countersigned");
+    assert_eq!(get("run_aired_misstated")["at"], json!(["run", 0]));
+    assert_eq!(get("room_event_signature")["at"].as_array().unwrap()[..3], [json!("room"), json!(0), json!("room")]);
+    assert_eq!(get("check_report_refused")["at"], json!(["report", "report"]));
+    assert_eq!(get("check_statement_refused")["at"], json!(["statement", "statement"]));
+    for n in ["owner_a_day", "owner_b_day", "operator_day", "owner_a_runs_alone", "owner_b_two_rooms", "check_owner_b_under_reported", "check_owner_a_csv", "check_owner_b_without_statement", "check_owner_b_reports_a_programme"] {
+        assert_eq!(get(n)["outcome"], "accept", "{n}");
+    }
+}
+
+/// §13's table names exactly the codes the reference adds, in its order.
+#[test]
+fn section_13_lists_exactly_the_reference_codes() {
+    let text = read("extensions/opportunity-report.md");
+    let at = text.find("\n## 13. Reasons").expect("§13");
+    let end = text[at + 1..].find("\n## ").map_or(text.len(), |e| at + 1 + e);
+    let listed: Vec<&str> = text[at..end].lines().filter_map(|l| l.strip_prefix("| `")).filter_map(|l| l.split('`').next()).collect();
+    let codes: Vec<&str> = Reason::ALL.iter().map(|r| r.code()).collect();
+    assert_eq!(listed, codes);
+}
+
+fn line<'a>(o: &'a Value, scope_: &str, key: &str) -> &'a Value {
+    o["lines"].as_array().unwrap().iter().find(|l| l["scope"] == scope_ && l["key"] == key).unwrap_or_else(|| panic!("no line {scope_} {key}"))
+}
+
+/// The worked example (§14). Owner B computes and signs its report of the day from the channel's
+/// two windows and the room's cues; its platform reports B's impressions per programme, and all
+/// but leaves out B's second documentary; B checks the report against it and against the
+/// operator's signed statement of the day. A party holding only the public records receives the
+/// check's document as text, verifies it, and recomputes the opportunities of every line from
+/// the attributed breaks and the contract alone.
+#[test]
+fn the_worked_example_shows_the_under_report_from_the_public_records() {
+    let w = corpus::world().expect("the world");
+    let b = &w.reports["owner_b"];
+    // B's report, computed from the documents without it, is the corpus's, byte for byte.
+    let (rep, report_doc) = opp::create(&w.pools.report_document(b, false), &corpus::key("owner-b"), corpus::pk("owner-b"), corpus::DAY16, corpus::DAY17).expect("B's report");
+    assert_eq!(rep.to_bytes(), b.report);
+    // Four cued breaks in B's documentaries: 360 s, twelve slots (four, two, four, two).
+    assert_eq!((rep.breaks, rep.break_ms, rep.slots), (4, 360_000, 12));
+    // The check of the platform's figures, beside the signed statement.
+    let inputs = w.pools.check_document(b, "b_programmes", Some(&w.statements["owner_b"]), None);
+    let (_, document) = opp::create_check(&inputs, &corpus::key("owner-b"), opp::FLOOR_PPM, opp::CEILING_PPM).expect("the check");
+
+    // A party holding only the public records: the document, as text.
+    let text = serde_json::to_string(&document).unwrap();
+    let got: Value = serde_json::from_str(&text).unwrap();
+    let a = opp::verify_check(&got).expect("the check verifies");
+    let o = opp::check_json(&a);
+    let period = line(&o, "period", "");
+    // Fourteen impressions reported against twenty-four the signed records prove, and revenue
+    // below B's signed part.
+    assert_eq!((period["impressions"].as_u64(), period["signed"]["impressions"].as_u64()), (Some(14), Some(24)));
+    assert_eq!(period["fill_ppm"], 1_166_666);
+    assert_eq!(period["flags"], json!(["impressions_below_signed", "revenue_below_signed"]));
+    // The first documentary is in step with the day; the second, as many slots and two
+    // impressions, falls far below it.
+    let doc_1 = line(&o, "programme", "b/doc-1");
+    let doc_2 = line(&o, "programme", "b/doc-2");
+    assert_eq!((doc_1["slots"].as_u64(), doc_1["flags"].clone()), (Some(6), json!([])));
+    assert_eq!((doc_2["slots"].as_u64(), doc_2["fill_ppm"].as_u64(), doc_2["flags"].clone()), (Some(6), Some(333_333), json!(["below"])));
+
+    // Recomputed from the report's attributed breaks and the contract: each programme's breaks,
+    // seconds and slots, over the breaks of the splits B shares in.
+    let report = opp::verify(&report_doc).expect("the report verifies");
+    let r = opp::accepted_json(&report);
+    let b_splits: BTreeSet<u64> = r["lines"].as_array().unwrap().iter().map(|l| l["split"].as_u64().unwrap()).collect();
+    let mut per: BTreeMap<String, (u64, u64, u64)> = BTreeMap::new();
+    for x in r["breaks"].as_array().unwrap() {
+        if !b_splits.contains(&x["split"].as_u64().unwrap()) {
+            continue;
+        }
+        let e = per.entry(x["asset"].as_str().unwrap_or("").to_string()).or_default();
+        e.0 += 1;
+        e.1 += x["duration_ms"].as_u64().unwrap();
+        e.2 += x["slots"].as_u64().unwrap_or(0);
+    }
+    for p in ["b/doc-1", "b/doc-2"] {
+        let l = line(&o, "programme", p);
+        assert_eq!(per[p], (l["breaks"].as_u64().unwrap(), l["break_ms"].as_u64().unwrap(), l["slots"].as_u64().unwrap()), "{p}");
+    }
+    // The signed figures, from the statement's own lines.
+    let st = &a.statement.as_ref().expect("the statement").statement;
+    assert_eq!(st.lines.iter().map(|l| l.impressions).sum::<u64>(), 24);
+    assert_eq!(period["signed"]["revenue"].as_u64(), Some(st.total));
+    // The check's lines are the only figures that change with the reported statement: the same
+    // report and statement beside owner A's fair CSV flag nothing.
+    let d = doc();
+    let v = d["vectors"].as_array().unwrap().iter().find(|v| v["name"] == "check_owner_a_csv").expect("A's check vector");
+    let fair = opp::verify_check(&corpus::document(&d, v).expect("it reads")).expect("A's check");
+    assert!(fair.check.lines.iter().all(|l| l.flags == 0), "A's reported statement is what its records prove");
+    assert_eq!(fair.check.lines[0].scope, scope::PERIOD);
+}
+
+/// Owner A's day holds every kind of break §4 makes: a break inside the ad slot after A's first
+/// episode counts as cued and the slot is not counted again; the slot no cue covers is scheduled
+/// and unslotted; slots come from a section or from the policy.
+#[test]
+fn owner_a_holds_every_kind_of_break() {
+    let w = corpus::world().expect("the world");
+    let a = opp::verify(&w.pools.report_document(&w.reports["owner_a"], true)).expect("A's report");
+    let mine: Vec<&opp::Break> = a.counted().collect();
+    let cued: Vec<&&opp::Break> = mine.iter().filter(|b| b.class == opp::class::CUED).collect();
+    let scheduled: Vec<&&opp::Break> = mine.iter().filter(|b| b.class == opp::class::SCHEDULED).collect();
+    assert_eq!(cued.len(), 4);
+    assert_eq!(scheduled.len(), 1);
+    assert_eq!((scheduled[0].slots, scheduled[0].asset.as_deref()), (None, Some("a/ep-2")), "the uncued ad slot, by the rule preceding");
+    let sources: Vec<Option<&str>> = cued.iter().map(|b| b.slot_source).collect();
+    assert_eq!(sources, [Some("policy"), Some("section"), Some("section"), Some("section")]);
+    assert_eq!(cued[2].asset.as_deref(), Some("a/ep-1"), "the break inside the ad slot, by the rule preceding");
+    let runs_alone = opp::verify(&w.pools.report_document(&w.reports["owner_a_runs_alone"], true)).expect("from the runs alone");
+    assert_eq!(runs_alone.counted().filter(|b| b.class == opp::class::SCHEDULED).count(), 2, "with no room, both ad slots are scheduled");
+}
diff --git a/wai/wai-studio/src/actions.generated.js b/wai/wai-studio/src/actions.generated.js
index 53de43d29..0fe72f926 100644
--- a/wai/wai-studio/src/actions.generated.js
+++ b/wai/wai-studio/src/actions.generated.js
@@ -1,7 +1,7 @@
 // GENERATED by scripts/actions.mjs from the WAI operation catalogue. Do not edit: change the
 // catalogue (wai-rs/src/catalogue.rs, exported by `wai ops export`), then run
 // `node scripts/actions.mjs`. `node scripts/actions.mjs --check` fails when this file differs.
-export const CATALOGUE = {"format":"wai.ops/1","toolchain":"0.4.0","sha256":"0ef1aab4f7b44a109dc7a0168c9394b0338458fe5fd23c75feb8892818304e1a"};
+export const CATALOGUE = {"format":"wai.ops/1","toolchain":"0.4.0","sha256":"ab16d7ceb6b7dfd8f50d469bc6efbb7451fee513da067a4408aeec078c4ffa10"};
 export const ACTIONS = [
   {"id":"toolchain.test","noun":"toolchain","verb":"test","menu":"Toolchain","item":"Test","palette":"toolchain test","summary":"WAI's four steps (name, dispatch, rebuild, receipt) on a picture made here, its receipt checked offline","placement":"local","effect":"writes-project","stability":"stable","toolset":"core","cli":"wai hello","mcp":null,"route":null,"call":"toolchain_test"},
   {"id":"project.create","noun":"project","verb":"create","menu":"Project","item":"Create","palette":"project create","summary":"A new project from one of the examples, written into a new or empty directory; --list names the templates","placement":"local","effect":"writes-project","stability":"stable","toolset":"core","cli":"wai create","mcp":null,"route":null,"call":"project_create"},
@@ -99,6 +99,9 @@ export const ACTIONS = [
   {"id":"contract.update","noun":"contract","verb":"update","menu":"Contract","item":"Update","palette":"contract update","summary":"An owner's countersignature added to a share contract, after its rules and the operator's signature are checked","placement":"local","effect":"writes-project","stability":"preview","toolset":"core","cli":"wai contract accept","mcp":null,"route":null,"call":"contract_update"},
   {"id":"statement.create","noun":"statement","verb":"create","menu":"Statement","item":"Create","palette":"statement create","summary":"A party's revenue-share statement for a period, recomputed from the ledger's invoices and the channel's program-as-run, signed with the operator key","placement":"local","effect":"writes-project","stability":"preview","toolset":"core","cli":"wai statement create","mcp":null,"route":null,"call":"statement_create"},
   {"id":"statement.verify","noun":"statement","verb":"verify","menu":"Statement","item":"Verify","palette":"statement verify","summary":"A revenue-share statement's verification document checked: every line recomputed from the public records, or the reason it is refused","placement":"local","effect":"reads","stability":"preview","toolset":"core","cli":"wai statement verify","mcp":null,"route":null,"call":"statement_verify"},
+  {"id":"opportunity.create","noun":"opportunity","verb":"create","menu":"Opportunity","item":"Create","palette":"opportunity create","summary":"A party's opportunity report for a period: the ad breaks a channel's signed cues and program-as-run prove in the programmes it shares in, signed with the issuer key","placement":"local","effect":"writes-project","stability":"preview","toolset":"core","cli":"wai opportunity create","mcp":null,"route":null,"call":"opportunity_create"},
+  {"id":"opportunity.verify","noun":"opportunity","verb":"verify","menu":"Opportunity","item":"Verify","palette":"opportunity verify","summary":"An opportunity report's or a statement check's verification document checked: every break, line and flag recomputed from the records, or the reason it is refused","placement":"local","effect":"reads","stability":"preview","toolset":"core","cli":"wai opportunity verify","mcp":null,"route":null,"call":"opportunity_verify"},
+  {"id":"statement.check","noun":"statement","verb":"check","menu":"Statement","item":"Check","palette":"statement check","summary":"A platform's reported statement checked against an opportunity report and, when given, the operator's signed statement, signed with the issuer key","placement":"local","effect":"writes-project","stability":"preview","toolset":"core","cli":"wai statement check","mcp":null,"route":null,"call":"statement_check"},
   {"id":"ops.list","noun":"ops","verb":"list","menu":"Ops","item":"List","palette":"ops list","summary":"Every operation of this catalogue: its id, command line, effect and whether this build holds it","placement":"local","effect":"reads","stability":"stable","toolset":"core","cli":"wai ops list","mcp":null,"route":null,"call":"ops_list"},
   {"id":"ops.search","noun":"ops","verb":"search","menu":"Ops","item":"Search","palette":"ops search","summary":"The operations that match a task, ranked, offline: up to five","placement":"local","effect":"reads","stability":"stable","toolset":"core","cli":"wai ops search","mcp":null,"route":null,"call":"ops_search"},
   {"id":"ops.show","noun":"ops","verb":"show","menu":"Ops","item":"Show","palette":"ops show","summary":"One operation's entry: its input and output schemas, effect, placement and command line","placement":"local","effect":"reads","stability":"stable","toolset":"core","cli":"wai ops show","mcp":null,"route":null,"call":"ops_show"},