diff --git a/.github/workflows/wai-conformance.yml b/.github/workflows/wai-conformance.yml
index 50878b75e..53694074c 100644
--- a/.github/workflows/wai-conformance.yml
+++ b/.github/workflows/wai-conformance.yml
@@ -83,6 +83,10 @@ on:
       # tests/timed_text.rs requires this extension's §12 to list the codes the reference
       # reports, and the registry's wire identifiers test reads its sections.
       - 'wai/extensions/timed-text.md'
+      # tests/access_services.rs requires this extension's §10 to list the codes the reference
+      # reports, access_services_verify.py reads that table, and the registry's wire
+      # identifiers test reads its sections.
+      - 'wai/extensions/access-services.md'
       # tests/live_metering.rs requires this extension's §9 to list the codes the reference
       # reports, live_metering_verify.py reads that table, and the registry's wire identifiers
       # test reads its sections.
@@ -1023,6 +1027,25 @@ jobs:
           (cd wai-rs && cargo test --no-default-features --features timed_text --lib timed_text::)
           (cd wai-rs && cargo test --no-default-features --features timed_text --test timed_text)
           python3 -I live-conformance/timed_text_verify.py live-conformance/captions
+      # wai.access.services (extensions/access-services.md): the reference module's unit tests
+      # (words, full and prefix alignment with their walk back, signed integers, gains) and
+      # tests/access_services.rs (vectors.json and each DAPT document regenerate byte for byte
+      # from their fixed seeds and no other file is there, wai-rs gives every vector and
+      # document its stated outcome and figures, every reason of §10 refuses a case, and §10
+      # lists exactly the reference's codes); then the corpus's second implementation,
+      # access_services_verify.py, written from the extension's text and sharing no code with
+      # wai-rs, which verifies events and captions with timed_text_verify.py and every record
+      # with WAI's strict Ed25519 rule, computes every figure and writes every DAPT document
+      # itself, parses each with xml.etree, reads the extension's reason table, and requires
+      # every mutated copy of the corpus to fail; standard library only, run isolated (-I).
+      - name: access services · wai-rs and access_services_verify.py
+        working-directory: wai
+        shell: bash
+        run: |
+          set -euo pipefail
+          (cd wai-rs && cargo test --no-default-features --features access_services --lib access_services::)
+          (cd wai-rs && cargo test --no-default-features --features access_services --test access_services)
+          python3 -I live-conformance/access_services_verify.py live-conformance/access
       # wai.live.metering (extensions/live-metering.md): the reference module's unit tests
       # (records and ledgers round-trip, the energy rules, the size bound at its limit, a
       # total of two classes told from a wrong one, funds rounding, the CMCD event-timeline
diff --git a/wai/CHANGELOG.md b/wai/CHANGELOG.md
index 6fa6bf836..69b474fd8 100644
--- a/wai/CHANGELOG.md
+++ b/wai/CHANGELOG.md
@@ -6,6 +6,56 @@ wire format may change and such changes are recorded here.
 
 ## v0.4.0 — current
 
+### `wai.access.services`: caption quality anyone can recompute, audio description and sign language
+
+- **The extension** ([access-services](extensions/access-services.md)) registers the record
+  `wai.access.services`. Captions are timed-text's, unchanged; its records are JSON texts in
+  the JCS form, each signed with Ed25519 under `wai:access` and named by its SHA-256.
+- **Caption quality from the signed revisions.** A caption track's **latency** is each cue's
+  first display on the room clock less the capture of its first word: a sources record places
+  the words on a take, mapped to the room clock by the take's opening commitment (the take is
+  checked to derive from a `record_start` to the commitment's author), or on the room clock as
+  its signer states, and the class (`capture`, `stated`, `none`) says which. Its **stability**
+  is the revisions after first display and the words they changed; its **accuracy**, the word
+  errors of the first revision shown against a reference transcript or the reviewed final
+  revision, by a prefix alignment that does not count the words a partial has not reached.
+  Words fold ASCII case and edge punctuation, and the alignment walks back by one fixed rule,
+  so substitutions, deletions and insertions are the same everywhere. A quality record states
+  the figure and names its inputs by digest; a verifier recomputes it (`figure_mismatch`,
+  `figure_inputs_mismatch`). §9 maps each figure onto 47 CFR 79.1(j) and (k)(2), the two UK
+  regulator statements on live subtitling (2013, 2024) and EBU Tech 3370's authoring delay,
+  and says what is not computed (severity grading, speed, placement).
+- **Audio description.** A description record holds the script (each event's interval, what
+  of the image it describes, its text), the ducking of the programme audio under each event,
+  and the voicing, on a separate track or by the sink with a pinned model, the script and the
+  voice each labelled human, machine or machine-reviewed. A voice must start within 35 ms
+  early and 45 ms late of the end of the duck and end no later than 45 ms after the duck
+  starts to rise, DAPT §5.5's bounds (`description_out_of_sync`). The record maps onto a DAPT
+  document (W3C Candidate Recommendation Draft of 2026-06-26), written by hand, with the
+  ducking as Mixing Instructions on each Script Event and the voice as an Audio Recording or
+  Synthesized Audio. A claim reports how much of each description is spoken over captioned
+  dialogue, a figure, not a refusal.
+- **Sign language.** A signing record binds each object of an avatar pose stream, or of the
+  video of a signer, to the final caption revisions it translates, by digest
+  (`sign_revision_unknown`, `sign_revision_not_final`); a review signs off the translation.
+  Its figures are each segment's delay behind the speech and, for video, whether it meets the
+  resolution and frame rate EN 301 549 V4.1.1 clauses 6.5.2 and 6.5.3 state.
+- **Completeness.** A claim declares a session's access tracks; a verifier checks each is
+  present, finished (every cue resolved, every description voiced, every cue signed), in its
+  language and within the tolerances the claim states, its reviews held and not rejected.
+- **Reference and corpus.** The `access_services` module of `wai-rs` (feature
+  `access_services`) and `live-conformance/access/`, written from fixed seeds by
+  `wai_access_services_vectors`: a lesson with human and machine captions, a take, a
+  reference, quality records, a voiced description, a motion-captured signer and a claim; a
+  reviewed session with a sink-voiced description and a signer's video; a session with no
+  sources; and a negative control for every reason of §10, among them a misstated latency, a
+  broken revision chain, a signing bound to a superseded revision, descriptions spoken early
+  and late, and a claim over a track the verifier does not hold. Its second implementation,
+  `live-conformance/access_services_verify.py`, gives every case the same outcome and figures
+  and every DAPT document the same bytes, and every mutated copy of the corpus fails.
+- **timed-text** §1 now points audio description, which it leaves out of scope, to this
+  extension.
+
 ### `wai.delivery.settlement`: delivery paid on what the party that received it signed
 
 - **The extension** ([settlement](extensions/settlement.md)) registers the record
diff --git a/wai/REGISTRY.md b/wai/REGISTRY.md
index 70be16b2d..0fa7ac0bb 100644
--- a/wai/REGISTRY.md
+++ b/wai/REGISTRY.md
@@ -154,6 +154,7 @@ and a role are fixed once registered.
 <!-- generated: wai registry export; do not edit by hand -->
 | string | kind | status | media | role | licence | replicate | sets | registered in |
 |---|---|---|---|---|---|---|---|---|
+| `wai.access.services` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.ai.usage` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.asset.provenance` | record | registered | — | — | — | — | — | §5 Interactive, temporal & computed content |
 | `wai.audio.aac` | payload | registered | audio | standalone | patent-pool | standard-unclassified | — | §5 Broadcast and streaming codecs |
@@ -355,6 +356,7 @@ and a role are fixed once registered.
 | `science.transaction.wai.multivariant` | data-id | defined | http-delivery §11.1 |
 | `science.transaction.wai.stages` | data-id | defined | packaging §8 |
 | `science.transaction.wai.timed-text` | data-id | defined | timed-text §10.5 |
+| `tag:transaction.science,2026:wai/access` | scheme | defined | access-services §5.5 |
 | `tag:transaction.science,2026:wai/class` | scheme | defined | packaging §8 |
 | `tag:transaction.science,2026:wai/floor` | scheme | defined | http-delivery §11.1 |
 | `tag:transaction.science,2026:wai/http-delivery` | scheme | defined | http-delivery §11.1 |
@@ -364,10 +366,15 @@ and a role are fixed once registered.
 | `urn:wai:event:1` | scheme | defined | live-events §8.4 |
 | `urn:wai:event:1` | catalog | defined | live-events §8.1 |
 | `wai` | catalog | defined | moq-streaming-format §3 |
+| `wai-access-completeness` | document-kind | defined | access-services §7.1 |
 | `wai-authorship-map` | document-kind | defined | contribution §7.3 |
 | `wai-c2pa` | catalog | defined | live-provenance §10.2 |
+| `wai-caption-quality` | document-kind | defined | access-services §4.7 |
+| `wai-caption-reference` | document-kind | defined | access-services §4.3 |
+| `wai-caption-sources` | document-kind | defined | access-services §4.2 |
 | `wai-contribution` | document-kind | defined | contribution §6 |
 | `wai-derivation` | document-kind | defined | deriving-edge §5.1 |
+| `wai-description` | document-kind | defined | access-services §5.1 |
 | `wai-detection` | document-kind | defined | synthesis §7.3 |
 | `wai-key-status` | document-kind | defined | jwp-receipts §7.9 |
 | `wai-label-policy` | document-kind | defined | synthesis §10.1 |
@@ -381,6 +388,8 @@ and a role are fixed once registered.
 | `wai-receipts` | catalog | defined | moq-streaming-format §4.1 |
 | `wai-review` | document-kind | defined | synthesis §9.1 |
 | `wai-session` | document-kind | defined | contribution §3.1 |
+| `wai-signing` | document-kind | defined | access-services §6.1 |
+| `wai-signing-review` | document-kind | defined | access-services §6.4 |
 | `wai-step` | document-kind | defined | contribution §4.1 |
 | `wai1` | codecs-prefix | defined | http-delivery §4.1 |
 | `wai1` | fourcc | provisional | http-delivery Appendix B |
diff --git a/wai/SPEC.md b/wai/SPEC.md
index 89fdf22e0..39fcf587a 100644
--- a/wai/SPEC.md
+++ b/wai/SPEC.md
@@ -968,6 +968,23 @@ The event's origin and model digest are the disclosure label, carried through ev
 IMSC1 attributes) or, where a target cannot hold it, in a sidecar:
 [`extensions/timed-text.md`](extensions/timed-text.md).
 
+And for the **access services** of a room session — `wai.access.services`: figures about a
+caption track that any verifier recomputes from its signed revisions. Its latency is each cue's
+first display on the room clock less the capture instant of the speech it carries, placed
+through a take's opening commitment or as an aligner states it; its stability, the revisions
+after first display and the words they changed; its accuracy, the word errors of the first
+revision shown against a reviewed final revision or a signed reference transcript; all in
+integer arithmetic over one fixed word alignment, so a quality figure a vendor states is checked
+by recomputing it. An audio description track is a signed script of timed descriptions, the
+ducking of the programme audio under each, and its voicing on a separate track or by the sink,
+each labelled human or machine; its voice is held to the synchronisation bounds of the Dubbing
+and Audio description Profiles of TTML2, and it maps onto a document of that profile. A sign
+language track, an avatar pose stream or the video of a person signing, is bound by digest to
+the final caption revisions it translates, with a reviewer's optional sign-off. A completeness
+claim states that each access track a session declares was delivered complete and in sync,
+against tolerances it names, and a verifier checks it against the records:
+[`extensions/access-services.md`](extensions/access-services.md).
+
 And for what a room session **cost** — `wai.live.metering`: every hop that carried the session
 (a relay, a compositor, an ingest gateway) signs one per-hop session record, `WMH1`: per track
 and direction the objects and bytes it carried and the objects it dropped by reason, with those
diff --git a/wai/extensions/access-services.md b/wai/extensions/access-services.md
new file mode 100644
index 000000000..448deabe1
--- /dev/null
+++ b/wai/extensions/access-services.md
@@ -0,0 +1,859 @@
+# WAI Extension: Access Services
+
+> Status: Draft. Registers the record `wai.access.services`: the access services of a room
+> session, and figures about them that any verifier recomputes from signed records. Captions
+> are [timed-text](timed-text.md)'s, unchanged. This extension adds a **quality figure** for a
+> caption track: its **latency**, the room-clock instant a cue was first shown less the
+> capture instant of the speech it carries; its **stability**, the revisions after first
+> display and the words they changed; and its **accuracy**, the word errors of the first
+> revision shown against a reviewed final revision or a signed reference transcript. Each is
+> defined in integer arithmetic over the signed revisions, so two verifiers reach the same
+> numbers, and a figure a vendor states is checked by recomputing it. **Audio description** is
+> a signed description track, a script of timed descriptions with their mixing instructions
+> (the programme audio ducked under each) and their voicing, a separate audio track or a voice
+> the sink synthesizes, each labelled human or machine; it maps onto a document of the Dubbing
+> and Audio description Profiles of TTML2. **Sign language** is a signing track, a
+> `wai.avatar.pose` stream or the video of a person signing, whose objects are bound by digest
+> to the caption revisions they translate, with a reviewer's optional sign-off. A
+> **completeness claim** states, for a room session, that each access track it declares was
+> delivered complete and in sync, measured from signed times against the tolerances the texts
+> below state; a verifier checks it against the records. No new transport. The reference
+> implementation is the `access_services` module of `wai-rs` (feature `access_services`); the
+> corpus is [`live-conformance/access/`](../live-conformance/access/), and its second
+> implementation is `live-conformance/access_services_verify.py`.
+> Keywords **MUST**, **MUST NOT**, **SHOULD**, **MAY** are RFC 2119/8174.
+>
+> Texts read for this revision, each pinned to the version named: Directive (EU) 2019/882,
+> Annex I, Section IV, point (b)(ii), and Article 31(2), from a reproduction of the text as
+> adopted (the Official Journal could not be fetched for this revision); EN 301 549 V4.1.1
+> (2026-09), clauses 4.2.4, 6.5.2, 6.5.3, 7.1.2, 7.1.5, 7.2.1 to 7.2.3, 7.3, 12.4 and 12.5;
+> Web Content Accessibility Guidelines (WCAG) 2.2, Success Criteria 1.2.2 to 1.2.7; 47 CFR
+> 79.1(j)(2), (j)(3) and (k)(2), and 47 CFR 79.3(a)(3), as in force on 2026-10-01; Dubbing and
+> Audio description Profiles of TTML2 (DAPT), W3C Candidate Recommendation Draft of
+> 2026-06-26 (`CRD-dapt-20260626`), §4.1 to §4.10, §5.2, §5.3, §5.5 to §5.7 and Appendix
+> H.2.2; EBU Tech 3370, EBU-TT Part 3, version 1.0 (May 2017), §2.3.2 and §2.3.3; and two
+> statements of the United Kingdom's communications regulator, *Measuring the quality of live
+> subtitling* (16 October 2013), §1.3, §3.65 to §3.67 and footnote 21, and *Ensuring the
+> quality of TV and on-demand services* (15 April 2024), §3.3, §5.17, §5.23, §5.25, §5.29,
+> §6.2 and §6.14. A section number of one of those texts in this extension is that version's,
+> and is written with the text's name; a bare section number is this extension's. DAPT is a
+> Candidate Recommendation Draft, whose features may change before it is a Recommendation,
+> and one that §5.5 uses is at risk there.
+
+## 1. Scope
+
+In scope: the records and their encoding (§2); words, and the alignment of two lists of words
+(§3); the quality figure of a caption track: the sources that place its words on the room
+clock, a reference transcript, latency, stability, accuracy, and the figure record (§4);
+audio description: the description record, its script, mixing and voicing, its
+synchronisation, its DAPT document, and what a player owes its listeners (§5); sign language:
+the signing record, its binding to caption revisions, and a review (§6); the completeness
+claim (§7); verification (§8); and what each figure measures in the texts above (§9).
+
+Out of scope: a transport; recognising speech, writing descriptions, translating into a sign
+language and synthesizing speech, which produce the content; grading the severity of an
+error, which needs a person (§9); decoding a voicing track or a signing track, whose objects
+this extension names by digest; spoken subtitles and extended audio description, which pause
+or lengthen the programme; how a sink renders a description or a signer; and what any law
+requires.
+
+Relationship to the core spec: `wai.access.services` 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.
+
+Relationship to [timed-text](timed-text.md): captions are its live captions, verified as its
+§4.3 verifies them, and this extension changes nothing in them. The audio description that
+timed-text §1 leaves out of its scope is this extension's §5.
+
+Relationship to [avatars](avatars.md) and [capture-binding](capture-binding.md): a signing
+track in pose form is a `wai.avatar.pose` world, whose op batches are its objects (avatars
+§5); a source on a take is placed on the room clock by the take's clock mapping
+(capture-binding §9.3).
+
+Relationship to [synthesis](synthesis.md): the origins this extension's records state are a
+caption's, which synthesis §1 maps onto its classes. A description voiced or written by a
+model, and a signing a model generates, is synthesized media in its sense: class
+`synthesized`, step `generate`, with the operation `speech-synthesis` for a voice, and
+oversight `fully_autonomous` for origin `machine` or `human_validated` for origin
+`machine-reviewed` (synthesis §3.1, §3.2). The publisher of such a track signs its origin
+claim there; this extension's label is the same statement, carried where a description or a
+signing is read. A review of §6.4 reviews a translation against caption revisions; a review
+of one exact reconstruction of a generated track, which every exact sink then shows, is
+synthesis §9.1's.
+
+Duties this extension supports: the access services of Directive (EU) 2019/882, Annex I,
+Section IV(b)(ii) ("subtitles for the deaf and hard of hearing, audio description, spoken
+subtitles and sign language interpretation … fully transmitted with adequate quality for
+accurate display, and synchronised with sound and video, while allowing for user control of
+their display and use"); EN 301 549 V4.1.1 clauses 7.2.1 to 7.2.3, 7.3 and 12.4, beside the
+caption clauses timed-text §11 answers; WCAG 2.2 Success Criteria 1.2.3, 1.2.5 and 1.2.6,
+beside the caption criteria 1.2.2 and 1.2.4; and the caption quality standards of 47 CFR
+79.1(j). WAI states what its records carry and what a verifier checks. It makes no statement
+about any regime, and a deployment confirms what a regime asks of it against that regime's
+text.
+
+## 2. Records
+
+Every record of this extension is a JSON object (RFC 8259), read as
+[jwp-receipts](jwp-receipts.md) §3.1 step 1 reads a claim: RFC 8259's grammar, no byte-order
+mark, no member named twice in one object, no `\u` escape that leaves a surrogate unpaired,
+and at most 32 levels of nesting. Its values use the encodings of jwp-receipts §2.4.3: byte
+strings in lowercase hexadecimal; integers unsigned, at most 2^53 − 1, in plain decimal; no
+other number and no boolean. The types in this extension's tables are:
+
+- `hex32`, `hex64`: 64 or 128 lowercase hexadecimal digits;
+- `int`: such an integer;
+- `sint`: a **signed integer**, written as a JSON string: `0`, or an optional `-` then a
+  digit 1 to 9 then any digits, whose value lies in −2^63 to 2^63 − 1;
+- `string`: a JSON string; `tag`: a string that live-events §4.10 reads as a language tag
+  (checked by the rules of the record's section);
+- a list of quoted values: a string equal to one of them;
+- `object`, `array`: as the table under it says; `null`, written where a member may be null.
+
+A record has exactly the members its table lists, at every level, none missing and none
+added, each of its type, and a `kind` that names it. One that is not JSON, or does not have
+that shape, is `record_malformed`.
+
+Every record carries `signer_pubkey` (`hex32`, the Ed25519 key of RFC 8032 that signs it) and
+`sig` (`hex64`):
+
+```
+sig       = Ed25519(signer_key, "wai:access\x01" || JCS(record without "sig"))
+record id = SHA-256(JCS(record))
+```
+
+JCS is RFC 8785, which on these values reduces to what jwp-receipts §2.4.3 states. The
+signature is 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 `bad_signature`. A record is named
+by its record id wherever another names it. A member `room` names the room by its id
+(live-events §2); a record whose `room` is not the verifier's room is `wrong_room`.
+
+Which signers a verifier trusts for each kind of record is its policy. This extension checks
+what each record states against the events and the other records; a figure's weight comes
+from its recomputation (§4.7), not from its signer.
+
+## 3. Words and their alignment
+
+### 3.1 Words
+
+The **words** of a text are found in two steps:
+
+1. The text is split at every U+0020 and U+000A, and empty pieces are dropped.
+2. In each piece, every code point from U+0041 to U+005A is replaced by the one 0x20 above
+   it (ASCII letters to lower case), and code points of the set *P* are removed from its
+   start and its end, repeatedly, until it neither starts nor ends with one. A piece left
+   empty is dropped; the rest are the words, in order.
+
+*P* is U+0021 `!`, U+0022 `"`, U+0027 `'`, U+0028 `(`, U+0029 `)`, U+002C `,`, U+002D `-`,
+U+002E `.`, U+003A `:`, U+003B `;`, U+003F `?`, U+005B `[`, U+005D `]`, U+00A1 `¡`, U+00AB
+`«`, U+00BB `»`, U+00BF `¿`, U+2013 `–`, U+2014 `—`, U+2018 `‘`, U+2019 `’`, U+201C `“`,
+U+201D `”` and U+2026 `…`.
+
+No other normalisation is made: letters outside ASCII keep their case, and two words are
+equal when their code points are. The words so found ignore the case of ASCII letters and
+the punctuation at a word's edges, so an error of capitalisation or of such punctuation is
+not a word error here (§9).
+
+### 3.2 Alignment
+
+The alignment of a **hypothesis** *H* (words *h*₁ … *h*ₘ) to a **reference** *R* (words
+*r*₁ … *r*ₙ) is the table *D* of integers, for 0 ≤ *i* ≤ *m* and 0 ≤ *j* ≤ *n*:
+
+- *D*[0][*j*] = *j*, and *D*[*i*][0] = *i*;
+- *D*[*i*][*j*] = the least of *D*[*i* − 1][*j* − 1] + *c*, *D*[*i* − 1][*j*] + 1 and
+  *D*[*i*][*j* − 1] + 1, where *c* is 0 when *h*ᵢ = *r*ⱼ and 1 otherwise.
+
+Its **end** is a column *j*\*:
+
+- a **full** alignment ends at *j*\* = *n*;
+- a **prefix** alignment ends at the greatest *j* for which *D*[*m*][*j*] is the least
+  value in row *m*: the reference is read as far as the hypothesis reaches, and no further.
+
+Its **errors** are *E* = *D*[*m*][*j*\*] and its **reference words** *N* = *j*\*. They are
+split into substitutions, deletions and insertions by walking back from (*m*, *j*\*) to
+(0, 0), taking at each step the first of these that holds:
+
+1. *i* > 0, *j* > 0 and *D*[*i*][*j*] = *D*[*i* − 1][*j* − 1] + *c*: to (*i* − 1, *j* − 1),
+   a **substitution** when *c* is 1;
+2. *i* > 0 and *D*[*i*][*j*] = *D*[*i* − 1][*j*] + 1: to (*i* − 1, *j*), an **insertion**
+   (a hypothesis word the reference does not have);
+3. otherwise: to (*i*, *j* − 1), a **deletion** (a reference word the hypothesis does not
+   have).
+
+The substitutions, deletions and insertions add up to *E*.
+
+## 4. Caption quality
+
+### 4.1 The caption track and its cues
+
+A **caption track** is the caption events of one principal *P* in a room's stream, verified
+as [timed-text](timed-text.md) §4.3 verifies them. Its **cues** are the chains of its
+revisions (timed-text §2): each from its first revision *r*₀ to its last *r*ₖ. A cue is named
+by the digest of *r*₀'s `caption` event (live-events §3.2).
+
+*P*'s captions are **whole** when *P* has at least one cue, the verifier holds every `seq` of
+*P* from 0 to the last it holds (no delivery gap of *P*, live-events §6.2), and, for every
+cue, *r*ₖ is final and its annotation is not unknown (timed-text §4.3). They are
+**resolved** when they are whole and every *r*ₖ has a `duration_ms` above 0, so that each cue
+resolves (timed-text §4.5). A figure is computed only over whole captions.
+
+The **events digest** of *P* is SHA-256 over the digests of *P*'s `caption` events the
+verifier holds, 32 bytes each, in `seq` order.
+
+### 4.2 Sources
+
+A **sources** record places the words of each cue on the room clock: where the speech the cue
+carries was captured.
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-caption-sources"` | |
+| `room` | `hex32` | the room |
+| `principal` | `hex32` | *P*, whose cues it places |
+| `sources` | array | one entry per cue it places, each an object below |
+| `signer_pubkey`, `sig` | | §2 |
+
+| member of an entry | type | meaning |
+|---|---|---|
+| `cue` | `hex32` | the cue, by the digest of its first revision |
+| `basis` | `"take"`, `"room"` | what `start` and `end` are measured on |
+| `take` | `hex32` or `null` | for `take`, the take id (capture-binding §3.2); `null` for `room` |
+| `start`, `end` | `int` | the capture of the cue's first word and of its last: device-clock microseconds of the take, or room-clock microseconds |
+
+Its signer is whoever aligned the words to the media: the captioner, or anyone holding the
+media afterwards. The alignment of a word to the media is the signer's statement; the
+media's own time is not. On the basis `take`, the instants are positions in the master of a
+take, and the take's clock mapping places them on the room clock: the offset *o* of the
+take's opening commitment (capture-binding §9.3), which the capturing device signed while it
+captured. A **source instant** *d* maps to the room-clock instant *d* + *o*. On the basis
+`room`, the instants are on the room clock as stated.
+
+Rules, in order:
+
+1. `room` is the verifier's: otherwise `wrong_room`.
+2. No sources record of *P* comes before it in the order given: otherwise
+   `record_conflict`.
+3. Each entry: `take` is a `hex32` exactly when `basis` is `take`, and `start` ≤ `end`;
+   no cue is named twice: otherwise `record_malformed`.
+4. *P*'s captions are whole (§4.1): otherwise `stream_incomplete`.
+5. Each entry's `cue` names a cue of *P*'s captions: otherwise `source_unknown`.
+6. Each entry on the basis `take`: among the events the verifier accepted there is a
+   `take_commit` event whose payload capture-binding §5.2 reads, whose `take` is the entry's
+   take, and which is an opening commitment (`n` 0, `phase` 1, capture-binding §5.3); the
+   first such in stream order is the take's opening commitment, its author *A* and its
+   offset *o*. The take is **derived**: an accepted `control` event whose command is
+   `record_start` and whose `target` is *A* has a digest *s* for which SHA-256 of
+   `wai:capture-take`, 0x01, the room id, *A* and *s* is the take (capture-binding §3.2).
+   And `start` + *o* is not below 0. Otherwise `source_take_unknown`.
+
+*P*'s **sources record** is the first sources record of *P* in the order given, and its
+**reference record** the first reference record (§4.3); a later one of either is
+`record_conflict`. Who may start a take, and which device captures for which principal, are
+live-rooms' and capture-binding's checks; this extension uses the take's mapping as
+capture-binding §9.3 defines it, and its bound, *J*, holds where a take verifier gives the
+take `single-take` and `aligned` (capture-binding §9.4, §10).
+
+### 4.3 The reference transcript
+
+A **reference** record gives, for each cue of *P*, the text a reviewer holds correct.
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-caption-reference"` | |
+| `room` | `hex32` | the room |
+| `principal` | `hex32` | *P* |
+| `entries` | array | one per cue, each `{"cue": hex32, "text": string}` |
+| `signer_pubkey`, `sig` | | §2 |
+
+Rules, in order: `room` is the verifier's (`wrong_room`); no reference record of *P* comes
+before it in the order given (`record_conflict`); no cue is named twice (`record_malformed`);
+each text meets timed-text §3.2 rules 1 to 3 (`text_not_in_subset`); *P*'s captions are whole
+(`stream_incomplete`); each entry names a cue of *P* (`reference_unknown`); and every cue of
+*P* has an entry (`reference_incomplete`).
+
+### 4.4 Latency
+
+The latency of a cue that a sources entry places is *L* = `t`(*r*₀) − *S*, in microseconds,
+where `t`(*r*₀) is the room-clock instant its first revision was shown from (timed-text
+§4.1) and *S* is its entry's `start` on the room clock (§4.2). *L* is negative when the
+caption was shown before the speech began.
+
+Over the cues of *P* that the sources record places, *n* of them, with their latencies in
+ascending order *L*₁ ≤ … ≤ *L*ₙ:
+
+- `min` = *L*₁, `max` = *L*ₙ;
+- `mean` = ⌊(*L*₁ + … + *L*ₙ) / *n*⌋, rounded toward negative infinity;
+- `p50` and `p95`: the latency at rank ⌈50 × *n* / 100⌉ and ⌈95 × *n* / 100⌉, counting
+  from 1.
+
+Each is `null` when *n* is 0. The **class** of the latency is `none` when *n* is 0;
+otherwise `capture` when every entry is on the basis `take`, and `stated` when any is on the
+basis `room`.
+
+### 4.5 Stability
+
+For one cue, its **revisions** are *k*, the revisions after the first, and its **words
+changed** the sum, over each revision *r*ᵢ and the one that supersedes it *r*ᵢ₊₁, of the
+substitutions and insertions of the full alignment of the words of *r*ᵢ (the hypothesis) to
+the words of *r*ᵢ₊₁ (the reference): the words a viewer saw that the next revision did not
+keep. A word added at the end, as a partial grows, is a deletion there and is not counted.
+
+The track's figures are the sums over its cues of revisions and of words changed, and
+`cues_corrected`, the number of cues whose words changed is above 0.
+
+### 4.6 Accuracy
+
+The reference of a cue is its entry's text in *P*'s reference record, when *P* has one;
+otherwise the text of *r*ₖ, the cue's final revision. The **class** of the accuracy is:
+
+- `transcript` when *P* has a reference record;
+- `reviewed` when it has none and every cue's *r*ₖ has origin 1 (human) or 3
+  (machine-reviewed): a person wrote or reviewed the reference;
+- `self` otherwise: the reference is the machine's own final text, and the figure measures
+  how far its first display was from its own last.
+
+Two figures, each the sums over the cues of the counts of §3.2:
+
+- `first`: the prefix alignment of the words of *r*₀ to the words of the reference. It counts
+  the errors in what the viewer first saw, against as much of the reference as that revision
+  reaches, so the words a partial has not reached yet are not errors.
+- `final`: the full alignment of the words of *r*ₖ to the words of the reference, when the
+  class is `transcript`; `null` otherwise.
+
+Each is `{"words", "errors", "substitutions", "deletions", "insertions"}`: *N*, *E* and its
+three parts.
+
+### 4.7 The figure
+
+A **quality** record states the figures of *P*'s track.
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-caption-quality"` | |
+| `room` | `hex32` | the room |
+| `principal` | `hex32` | *P* |
+| `events` | `hex32` | *P*'s events digest (§4.1) |
+| `sources` | `hex32` or `null` | the record id of *P*'s sources record, or `null` when there is none |
+| `reference` | `hex32` or `null` | likewise, of its reference record |
+| `cues` | `int` | the number of *P*'s cues |
+| `latency` | object | `{"class", "n", "min", "max", "mean", "p50", "p95"}`: a string of §4.4, an `int`, and five `sint` or `null` |
+| `stability` | object | `{"revisions", "words_changed", "cues_corrected"}`, each an `int` |
+| `accuracy` | object | `{"class", "first", "final"}`: a string of §4.6, an object of §4.6, and one or `null` |
+| `signer_pubkey`, `sig` | | §2 |
+
+Rules, in order:
+
+1. `room` is the verifier's: otherwise `wrong_room`.
+2. *P*'s captions are whole (§4.1): otherwise `stream_incomplete`.
+3. `events`, `sources` and `reference` are as the table says: otherwise
+   `figure_inputs_mismatch`.
+4. Every other member but `kind`, `signer_pubkey` and `sig` equals the figure the verifier
+   computes from §4.4 to §4.6: otherwise `figure_mismatch`.
+
+A figure that passes is the figure of exactly those revisions, placed by exactly those
+sources and measured against exactly that reference. A verifier needs no record of its own to
+compute a figure: the **figure** of a whole track is the object a quality record would carry,
+without `kind`, `signer_pubkey` and `sig`.
+
+## 5. Audio description
+
+### 5.1 The description record
+
+A **description** record is an audio description track: a script of timed descriptions of
+what is seen, the mixing of each into the programme audio, and its voicing. Times are media
+time in milliseconds, on the timeline of the media the descriptions accompany, as
+timed-text §2 defines it.
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-description"` | |
+| `lang` | `tag` | the language of the descriptions |
+| `script` | object | `{"origin", "model"}`: who wrote the descriptions |
+| `voicing` | object | `{"form", "origin", "model", "track"}`: who or what speaks them |
+| `events` | array | the descriptions, each an object below |
+| `signer_pubkey`, `sig` | | §2 |
+
+`origin` is `"human"`, `"machine"` or `"machine-reviewed"`, the names timed-text §10.5 gives
+the origins of a caption, and `model` is a `hex32` naming the model that wrote or spoke the
+text, or `null`. `form` is `"track"`, the voicing is a separate audio track named by `track`
+(a `hex32`, the track's digest, live-rooms §6.2), or `"sink"`, the sink synthesizes the
+voice from the text with the model `model`, and `track` is `null`.
+
+| member of an event | type | meaning |
+|---|---|---|
+| `id` | `string` | its identifier |
+| `begin`, `end` | `int` | the interval it describes, the description's time slot |
+| `represents` | `"visual"`, `"visual.nonText"`, `"visual.text"`, `"visual.text.title"`, `"visual.text.credit"`, `"visual.text.location"`, `"visual.dialogue"` | what of the image it describes: DAPT's content descriptors of the visual image (DAPT §4.7 and Appendix H.2.2) |
+| `text` | `string` | the description |
+| `duck` | object | `{"gain", "ramp"}`, each an `int`: the programme audio's gain under the description in thousandths, and the milliseconds it takes to fall to it and to rise back |
+| `voice` | object or `null` | `{"begin", "end"}`, each an `int`: where the voicing track speaks it; `null` when the form is `sink`, or when the track has not voiced it |
+
+### 5.2 Rules
+
+In order; the first that fails names the refusal:
+
+1. `lang` reads as live-events §4.10 reads a tag: otherwise `description_malformed`.
+2. `script.model` is a `hex32` exactly when `script.origin` is `machine` or
+   `machine-reviewed`; likewise `voicing.model` for `voicing.origin`; `voicing.track` is a
+   `hex32` exactly when `form` is `track`; and when `form` is `sink`, `voicing.origin` is not
+   `human`: otherwise `description_malformed`.
+3. There is at least one event; each `id` is one of `A`–`Z`, `a`–`z` or `_`, then up to 63
+   of those, `0`–`9`, `.` and `-`; no `id` twice; each `begin` < `end` ≤ 359 999 999; each
+   event's `begin` is at or after the `end` of the event before it (one voice describes one
+   thing at a time): otherwise `description_malformed`.
+4. Each `text` meets timed-text §3.2 rules 1 to 3: otherwise `text_not_in_subset`.
+5. Each `duck`: `gain` ≤ 1000; `ramp` is 0 when `gain` is 1000 and above 0 otherwise; and
+   2 × `ramp` ≤ `end` − `begin`. Each `voice`: `null` when the form is `sink`, and otherwise
+   `null` or within its event, the event's `begin` ≤ `voice.begin` < `voice.end` ≤ the
+   event's `end`, since a Script Event's audio is truncated at its end (DAPT §4.9.1):
+   otherwise `description_malformed`.
+6. The synchronisation of §5.3: otherwise `description_out_of_sync`.
+
+### 5.3 Synchronisation
+
+The programme audio falls to the event's gain from `begin` to `begin` + `ramp`, and rises
+back from `end` − `ramp` to `end`. The description is **spoken** over the interval between,
+from *a* = `begin` + `ramp` to *z* = `end` − `ramp`. Of a voiced event (its `voice` not `null`):
+
+- `voice.begin` ≥ *a* − 35 and `voice.begin` ≤ *a* + 45;
+- `voice.end` ≤ *z* + 45.
+
+These are DAPT §5.5's bounds on a presentation processor: audio presentation changes no more
+than 35 ms before the time a document specifies and no more than 45 ms after it, which DAPT
+derives from EBU R 37's bounds on audio relative to image. A voice that starts before the
+programme audio has fallen, or runs on after it has risen, is out of those bounds. EN 301 549
+V4.1.1 clause 7.2.2 requires the synchronisation to be preserved and states no figure.
+
+The **offset** of a voiced event is `voice.begin` − *a*, a signed number of milliseconds;
+an unvoiced event has none.
+
+### 5.4 Description over dialogue
+
+A description is spoken in the pauses of the dialogue (47 CFR 79.3(a)(3): "into natural
+pauses between the program's dialogue"), though the regulator's 2024 statement accepts
+describing over dialogue where what is seen matters more (§6.14 there). So this is a figure,
+not a refusal. Against the dialogue of one or more caption tracks, whose resolved cues
+(timed-text §4.5) cover the union *U* of their intervals, each from its `start` up to, not
+including, its `end`, an event's **overlap** is the milliseconds of its spoken interval that lie
+in *U*: from `voice.begin` up to `voice.end` when it is voiced, and from *a* up to *z*
+otherwise. The figure is the sum of the overlaps and the
+number of events whose overlap is above 0.
+
+### 5.5 The DAPT document
+
+A description record maps onto one DAPT document, given, for the form `track`, the voicing
+track's URI `U` and media type `T`, each one to 2048 of the ASCII characters `!` to `~`
+other than `"`, `&`, `<` and `>` (otherwise `parameter_malformed`). It is written as UTF-8
+with U+000A line ends:
+
+```
+<?xml version="1.0" encoding="UTF-8"?>
+<tt xmlns="http://www.w3.org/ns/ttml" xmlns:ttp="http://www.w3.org/ns/ttml#parameter" xmlns:tta="http://www.w3.org/ns/ttml#audio" xmlns:daptm="http://www.w3.org/ns/ttml/profile/dapt#metadata" xmlns:wai="tag:transaction.science,2026:wai/access" xml:lang="LANG" ttp:contentProfiles="http://www.w3.org/ns/ttml/profile/dapt1.0/content" daptm:langSrc="zxx" daptm:scriptRepresents="REPS" daptm:scriptType="TYPE" wai:script="SO" wai:voice="VO">
+<body>
+EVENTS
+</body>
+</tt>
+```
+
+- `LANG` is `lang`. `REPS` is each `represents` value of the events once, in the order each
+  first appears, joined by U+0020: every event's value is then one of them (DAPT §4.1.1).
+  `TYPE` is `asRecorded` for the form `track` and `preRecording` for the form `sink`.
+- `SO` and `VO` are the script's and the voicing's origins. After `wai:script="SO"` comes
+  ` wai:script-model="M"` when the script has a model, and after `wai:voice="VO"`,
+  ` wai:voice-model="M"` when the voicing has one, `M` the digest in lowercase hexadecimal.
+- `EVENTS` is, for each event in order:
+
+  ```
+  <div xml:id="ID" begin="B" end="E" daptm:represents="R">
+  <animate begin="00:00:00.000" end="RAMP" tta:gain="1;G" fill="freeze"/>
+  <animate begin="FALL" end="DUR" tta:gain="G;1"/>
+  <p>CONTENT</p>
+  </div>
+  ```
+
+  `B` and `E` are `begin` and `end` written `HH:MM:SS.mmm` (timed-text §5.1); `RAMP`, `FALL`
+  and `DUR` are `ramp`, `end` − `begin` − `ramp` and `end` − `begin`, written the same way;
+  `G` is the gain: `0` for 0, and otherwise `0.` and its three decimal digits with trailing
+  zeros removed. The two `animate` lines are written only when the gain is below 1000.
+- `CONTENT` is the text, its lines separated by `<br/>` and `&`, `<` and `>` written `&amp;`,
+  `&lt;` and `&gt;`:
+  - for the form `track` and a voiced event,
+    `<span begin="VB" end="VE"><audio src="U" type="T" clipBegin="CB" clipEnd="CE"/>TEXT</span>`,
+    with `VB` = `voice.begin` − `begin`, `VE` = `voice.end` − `begin`, `CB` = `voice.begin`
+    and `CE` = `voice.end`, each written `HH:MM:SS.mmm`. The voicing track is on the
+    programme's timeline (an audio description stem), so the event's audio is the interval
+    of it that the event's voice states;
+  - for the form `track` and an event not yet voiced, the text alone;
+  - for the form `sink`, `<span tta:speak="normal">TEXT</span>`.
+
+The document's features are DAPT's: a Script Event per description, a `div` with `xml:id`,
+`begin`, `end` and `daptm:represents` (DAPT §4.3); its Mixing Instructions as `animate`
+children of the Script Event, which adjust the programme audio during it (DAPT §4.3, §4.10);
+an Audio Recording by `src` and `type` with `clipBegin` and `clipEnd` (DAPT §4.9.1); and
+Synthesized Audio by `tta:speak` (DAPT §4.9.2). `ttp:contentProfiles` names the DAPT content
+profile, and no `ttp:profile` is written (DAPT §5.6). The document's time base is media time,
+times are clock times without frames (DAPT §5.7), and `daptm:langSrc` is `zxx`, content
+without an inherent language (DAPT §4.5). Two choices are this extension's:
+
+- `src` on `audio`, for an external resource, is at risk in the Candidate Recommendation
+  (its Issue 218). If it does not stay, a later revision of this mapping names the voicing
+  track another way DAPT §4.9.1 keeps.
+- For the form `sink`, DAPT says a pre-recording script SHOULD NOT contain Audio objects, and
+  an as-recorded script SHOULD NOT contain Synthesized Audio. There is no recording: the
+  sink's voice is the recording. The document is the script it speaks, marked as one, with
+  `tta:speak` saying that it is to be spoken.
+
+The attributes in the namespace `tag:transaction.science,2026:wai/access` are foreign
+vocabulary, which DAPT §5.2 has a processor keep or prune. They carry the origin labels of
+§5.6, which DAPT has no field for.
+
+### 5.6 Obligations of a WAI player
+
+These are requirements on a WAI player that plays audio description or shows sign language.
+Each cites the provision it answers by identifier; they are engineering requirements, and
+meeting them is not a statement about any law.
+
+1. **Description can be played.** A player of video with synchronised audio MUST let the
+   listener select an available description track and play it to the default audio output
+   (EN 301 549 V4.1.1 clause 7.2.1; WCAG 2.2 Success Criteria 1.2.3 and 1.2.5, which ask
+   content to provide it).
+2. **In sync.** A player that mixes a description MUST apply its mixing instructions and play
+   each voice at the times its event states, within §5.3's bounds (EN 301 549 V4.1.1 clause
+   7.2.2).
+3. **Preserved.** A player or converter that transmits, converts or records a description MUST
+   keep every event's timing, text, mixing instructions, voicing and labels (EN 301 549 V4.1.1
+   clause 7.2.3): §5.5's document keeps them all.
+4. **One operation.** A player whose purpose is video MUST offer turning description on and
+   off as a single operation, at the same level as the volume control (EN 301 549 V4.1.1
+   clause 7.3), as timed-text §11 item 5 has it for captions.
+5. **Labelled.** A player MUST show, with a description whose voicing is `machine` or
+   `machine-reviewed`, that the voice is synthesized, in a way the listener perceives without
+   turning on another feature, as timed-text §11 item 7 has it for a machine caption, and
+   SHOULD let the listener learn whether the script was machine-written. The script's origin
+   and the voicing's are the description's labels, as a caption's origin is its label
+   (timed-text §10.1); a synthesized voice's origin, with the model's digest, is the statement
+   its origin claim makes of it (synthesis §3.1), and a player shows its label as synthesis
+   §10 has it show a synthesized object's.
+6. **Signing under the viewer's control.** A player that shows a signing track MUST let the
+   viewer choose to show it, and SHOULD let the viewer choose its size and position (Directive
+   (EU) 2019/882 Annex I Section IV(b)(ii), "user control of their display"); a pose stream
+   leaves both to the sink (§6.1). It MUST show, with a signing track whose origin is
+   `machine` or `machine-reviewed`, that the signing is generated.
+
+## 6. Sign language
+
+### 6.1 The signing record
+
+A **signing** record is a sign language track: a `wai.avatar.pose` stream (avatars §1), or a
+video track of a person signing. Its objects are bound, by digest, to the caption revisions
+they translate.
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-signing"` | |
+| `room` | `hex32` | the room |
+| `lang` | `tag` | the sign language |
+| `source` | `hex32` | the principal of the caption track it translates |
+| `form` | `"pose"`, `"video"` | an avatar pose stream, or a video of a signer |
+| `track` | `hex32` | the track's digest (live-rooms §6.2) |
+| `origin`, `model` | | as §5.1: `human` for a person signing (filmed, or motion-captured into the pose stream), `machine` for signing a model generated |
+| `video` | object or `null` | for `video`, `{"width", "height", "rate_num", "rate_den"}`, each an `int`: its picture size and frame rate; `null` for `pose` |
+| `segments` | array | each an object below |
+| `signer_pubkey`, `sig` | | §2 |
+
+| member of a segment | type | meaning |
+|---|---|---|
+| `object` | `hex32` | the content hash of an object of the track (jwp-receipts §2.1): an op batch of the pose world, or a video object |
+| `start`, `end` | `int` | room-clock microseconds the signing of the object spans |
+| `revisions` | array of `hex32` | the caption revisions it translates, by the digest of each `caption` event |
+
+Pose-equivalence (avatars §4) makes the motion every sink shows the motion in the bound
+objects, while the appearance is the sink's: a viewer may choose the signer's size, place
+and appearance, which Directive (EU) 2019/882 Annex I Section IV(b)(ii) calls user control of
+display, and the binding still holds.
+
+### 6.2 Rules
+
+In order:
+
+1. `room` is the verifier's: otherwise `wrong_room`.
+2. `lang` reads as a tag; `model` is a `hex32` exactly when `origin` is `machine` or
+   `machine-reviewed`; `video` is `null` exactly for `pose`, and its four numbers are above 0;
+   there is at least one segment, each with `start` < `end` and at least one revision, each
+   segment's `start` at or after the `end` of the segment before it; and no revision is
+   named twice in the record: otherwise `signing_malformed`.
+3. `source`'s captions are whole (§4.1): otherwise `stream_incomplete`.
+4. Each named revision is a `caption` event of `source` that the verifier holds: otherwise
+   `sign_revision_unknown`.
+5. Each named revision is the last of its cue and final, its annotation not unknown: otherwise
+   `sign_revision_not_final`. Signing translates the text a cue resolves to; a partial that a
+   later revision changed is not what the captions say.
+
+### 6.3 Figures
+
+- The **offset** of a segment is its `start` less *S* (§4.4) of the earliest cue, by its
+  first revision's `t`, among those whose final revisions it names, when `source`'s sources
+  record places that cue; it has none otherwise. It is a signed number of microseconds: the
+  delay of the signing behind the speech it interprets.
+- For the form `video`, the **video floor** is `meets` when the picture is at least 320 by 240
+  in either orientation (the smaller side at least 240 and the larger at least 320) and the
+  frame rate at least 20 a second (`rate_num` ≥ 20 × `rate_den`), and `below` otherwise: the
+  resolution and frame rate EN 301 549 V4.1.1 clauses 6.5.2 and 6.5.3 require of real-time
+  video communication, which its clause 4.2.4 NOTE 3 names for sign language that accompanies
+  audiovisual content. For the form `pose` it is `null`: the sink renders the signer at the
+  size it chooses.
+
+### 6.4 Review
+
+A person who reviews the translation signs a **review**:
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-signing-review"` | |
+| `signing` | `hex32` | the record id of the signing record it reviews |
+| `scope` | `"translation"` | what was reviewed: the signing against the caption revisions it is bound to |
+| `verdict` | `"approved"`, `"approved-with-notes"`, `"rejected"` | |
+| `notes` | `hex32` or `null` | the digest of the reviewer's notes; `null` exactly for `approved` |
+| `signer_pubkey`, `sig` | | §2 |
+
+Rules: `notes` is `null` exactly when the verdict is `approved` (`record_malformed`), and
+`signing` is the record id of a signing record the verifier holds (`review_subject_unknown`).
+The review binds the objects by their digests, so, for a pose stream, every viewer whose sink
+is pose-equivalent sees the motion the reviewer approved. Its vocabulary is synthesis §9.1's
+review with the scope `translation`; that review binds one reconstruction of a synthesized
+object, and this one binds a signing record to the caption revisions it translates.
+
+## 7. The completeness claim
+
+### 7.1 The record
+
+A **completeness** claim states, for a room session, which access tracks it carried, and that
+each was delivered complete and in sync.
+
+| member | type | meaning |
+|---|---|---|
+| `kind` | `"wai-access-completeness"` | |
+| `room` | `hex32` | the room |
+| `from`, `to` | `int` | the session, from `from` up to, not including, `to`, in room-clock microseconds |
+| `pt0` | `int` | the media time of the room's `t0`, in milliseconds (timed-text §2) |
+| `tracks` | array | the access tracks it declares, each an object below |
+| `signer_pubkey`, `sig` | | §2 |
+
+| service | its members besides `service` |
+|---|---|
+| `"captions"` | `principal` (`hex32`), `lang` (`tag`), `latency_mean_max` and `latency_max` (each `int` or `null`, microseconds) |
+| `"audio-description"` | `record` (`hex32`, a description record's id), `lang` (`tag`) |
+| `"sign-language"` | `record` (`hex32`, a signing record's id), `lang` (`tag`), `review` (`hex32` or `null`, a review's id), `offset_max` (`int` or `null`, microseconds) |
+
+The tracks a claim declares are the availability of access services an electronic programme
+guide states (EN 301 549 V4.1.1 clauses 12.4 and 12.5), made checkable.
+
+A cue of *P* is **in the session** when its first revision's `t` is at or after `from` and
+before `to`. The
+session's media interval is from `pt0` + ⌊`from` / 1000⌋ to `pt0` + ⌊`to` / 1000⌋.
+
+### 7.2 Checking the claim
+
+1. `room` is the verifier's: otherwise `wrong_room`.
+2. `from` < `to`; at least one track; each track's `lang` reads; no principal is named by two
+   caption tracks, and no record by two tracks: otherwise `claim_malformed`.
+
+Then each track in order, the first failure naming the refusal:
+
+**Captions**, of principal *P*:
+
+1. *P* has a cue in the session: otherwise `track_missing`.
+2. *P*'s captions are resolved (§4.1): otherwise `track_incomplete`. A delivery gap is an
+   event not delivered, and a cue that does not resolve was not finished.
+3. Every revision of every cue of *P* in the session has the track's `lang`: otherwise
+   `track_mismatch`.
+4. When `latency_mean_max` or `latency_max` is not `null`: *P*'s sources record places every
+   cue of *P* in the session, otherwise `sync_unmeasured`; and over those cues the mean
+   latency (§4.4) is at most `latency_mean_max`, and each latency at most `latency_max`, where
+   each is given: otherwise `out_of_sync`.
+
+**Audio description**, of record *D*:
+
+1. *D* is a description record the verifier holds: otherwise `track_missing`.
+2. Its `lang` is the track's, and each of its events lies in the session's media interval:
+   otherwise `track_mismatch`.
+3. For the form `track`, every event is voiced: otherwise `track_incomplete`. (Each voice is
+   already in sync, §5.3.)
+
+**Sign language**, of record *G*:
+
+1. *G* is a signing record the verifier holds: otherwise `track_missing`.
+2. Its `lang` is the track's, and its `source` is the principal of a caption track of this
+   claim: otherwise `track_mismatch`.
+3. Every cue of `source` in the session has its final revision named by a segment of *G*:
+   otherwise `track_incomplete`.
+4. When `review` is not `null`: it is the id of a review the verifier holds (otherwise
+   `review_missing`), which names *G* (otherwise `review_mismatch`) and whose verdict is not
+   `rejected` (otherwise `review_rejected`).
+5. When `offset_max` is not `null`: every segment of *G* has an offset (§6.3), otherwise
+   `sync_unmeasured`; and each offset's absolute value is at most `offset_max`, otherwise
+   `out_of_sync`.
+
+A claim that passes is **held**. Its **dialogue overlap** is, for each audio description
+track, §5.4's figure against the resolved cues of the claim's caption tracks, their media
+times as timed-text §4.5 gives them with the claim's `pt0`.
+
+### 7.3 The tolerances
+
+| track | measured from | tolerance | stated by |
+|---|---|---|---|
+| captions, live | each cue's first display and its source (§4.4) | a mean of at most 4.5 s across live programming: a recommendation, not a limit per programme | the regulator's 2024 statement, §5.17 and §5.25; its 2013 statement (§3.65 to §3.67) recorded the earlier guidance of at most 3 s |
+| captions, shown by a player | a cue's time | within 100 ms of it, 20 ms as good practice | EN 301 549 V4.1.1 clause 7.1.2: the player's, timed-text §11 item 2 |
+| audio description | each voice and its event (§5.3) | 35 ms early to 45 ms late | DAPT §5.5, from EBU R 37 |
+| sign language | each segment and its source (§6.3) | none stated | no text read for this revision gives a figure; EN 301 549 V4.1.1 clause 4.2.4 NOTE 3 asks only that it be "well synchronized with the spoken content" |
+
+A claim states the caption and sign tolerances it is held to (`latency_mean_max`,
+`latency_max`, `offset_max`); the description tolerance is fixed by §5.3. The captions'
+mean is computed over the session, while the 2024 statement's is over a provider's live
+programming taken together; a claim that states 4 500 000 holds one session to it.
+
+## 8. Verification
+
+### 8.1 Inputs
+
+A verifier is given the room id; the records of the room's event stream, in stream order
+(live-events §6); and the records of this extension, as JSON texts, in the order given.
+
+### 8.2 Steps
+
+1. **Events.** Each event record is offered, in stream order, to a verifier of captions
+   ([timed-text](timed-text.md) §4.3), which verifies it as live-events §6 does and the
+   captions in it as timed-text §4.3 does. A refusal is the outcome, at `events` and the
+   record's index, with that extension's reason. At the end of the stream the captions are
+   finished (timed-text §4.3), and the gaps, which are not refusals, are noted.
+2. **Reading.** Each record is read (§2), its signature verified and its record id computed,
+   in the order given: a failure is the outcome, at `record` and the record's index.
+3. **Rules.** Then each record is checked by its section's rules, kind by kind in this
+   order, and the records of one kind in the order given: sources (§4.2), references
+   (§4.3), descriptions (§5.2), signings (§6.2), reviews (§6.4), quality records (§4.7) and
+   claims (§7.2). So a record that another names has been checked before it. The first
+   failure is the outcome, at `record` and the failing record's index.
+4. **Figures.** With no refusal, the outcome is **accept**, with: the figure (§4.7) of every
+   principal whose captions are whole, in the order of each one's first `caption` event in
+   the stream; for
+   each description record, its number of events, the number voiced and each event's offset
+   (§5.3); for each signing record, its number of segments and of revisions named, each
+   segment's offset and its video floor (§6.3); and for each claim, its dialogue overlap
+   (§7.2).
+
+## 9. What the figures measure
+
+| figure | what it measures | in the texts read |
+|---|---|---|
+| latency: per cue, its mean, its range (`min`, `max`) and two ranks | first display on the room clock, less the capture of the first word the cue carries | the 2013 statement's "average latency of the subtitling (the delay between speech and live subtitling), and the range of latencies" (§1.3(b)); the 2024 statement's mean (§5.17, §5.25); 47 CFR 79.1(k)(2)(vi), "lag between the spoken word supplied by the program origination point and when captions are received at the same program origination point", which the room clock's `t`, stamped as the caption leaves its author, measures; 79.1(j)(2)(ii) and (j)(3)(ii); EBU Tech 3370 §2.3.2's authoring delay, from the subtitler hearing the audio to the tool's output, and its §2.3.3 `ebuttm:authoringDelay`, which a producer may state and this figure measures |
+| stability: revisions after first display, words changed, cues corrected | what the viewer saw that a later revision changed | the 2024 statement's research finding that subtitles corrected live on air distract (§5.23) |
+| accuracy: words, errors, and their kinds | word errors against a reference a person wrote or reviewed | 47 CFR 79.1(k)(2)(iv): accuracy is the total words less the errors, over the total words, which is (*N* − *E*) / *N* here, and (k)(2)(v)'s kinds of error, of which this figure counts incorrect and missing words; 79.1(j)(2)(i); the 2013 statement's "number and type of errors" (§1.3(c)); the 2024 statement sets no minimum accuracy (§5.29) |
+| dialogue overlap | description spoken over captioned dialogue | 47 CFR 79.3(a)(3); the 2024 statement §6.2 and §6.14 |
+| completeness | every declared track present, every cue finished, every event voiced and every cue signed | Directive (EU) 2019/882 Annex I Section IV(b)(ii), "fully transmitted … synchronised"; 47 CFR 79.1(j)(2)(iii), captioning "from the beginning to the end of the program", which this claim checks over the cues the session holds, not over the speech it does not hold |
+
+Not computed here:
+
+- the severity of an error, which the error-classification model the 2013 statement's
+  measurement used (its footnote 21) grades minor, standard or serious: that grading needs a
+  person. The alignment gives the errors and the reference words a grader starts from;
+- errors of capitalisation and of punctuation at a word's edge, which §3.1 removes, and which
+  47 CFR 79.1(j)(2)(i) counts;
+- the speed of the captions, and their placement (79.1(j)(2)(iv));
+- the quality of a description, of a voice or of a signing, which a person judges, and
+  whose judgement a review records.
+
+## 10. Reasons
+
+| reason | raised at |
+|---|---|
+| `record_malformed` | §2, §4.2, §4.3, §6.4 |
+| `bad_key` | §2 |
+| `bad_signature` | §2 |
+| `wrong_room` | §2, §4.2, §4.3, §4.7, §6.2, §7.2 |
+| `record_conflict` | §4.2, §4.3 |
+| `source_unknown` | §4.2 |
+| `source_take_unknown` | §4.2 |
+| `text_not_in_subset` | §4.3, §5.2 |
+| `reference_unknown` | §4.3 |
+| `reference_incomplete` | §4.3 |
+| `stream_incomplete` | §4.2, §4.3, §4.7, §6.2 |
+| `figure_inputs_mismatch` | §4.7 |
+| `figure_mismatch` | §4.7 |
+| `description_malformed` | §5.2 |
+| `description_out_of_sync` | §5.2, §5.3 |
+| `parameter_malformed` | §5.5 |
+| `signing_malformed` | §6.2 |
+| `sign_revision_unknown` | §6.2 |
+| `sign_revision_not_final` | §6.2 |
+| `review_subject_unknown` | §6.4 |
+| `claim_malformed` | §7.2 |
+| `track_missing` | §7.2 |
+| `track_incomplete` | §7.2 |
+| `track_mismatch` | §7.2 |
+| `sync_unmeasured` | §7.2 |
+| `out_of_sync` | §7.2 |
+| `review_missing` | §7.2 |
+| `review_mismatch` | §7.2 |
+| `review_rejected` | §7.2 |
+
+An event record that [live-events](live-events.md) or [timed-text](timed-text.md) refuses
+keeps that extension's reason.
+
+## 11. Conformance
+
+[`live-conformance/access/`](../live-conformance/access/) holds the corpus, written from fixed
+seeds by `wai_access_services_vectors gen`: `vectors.json`, and each description record's DAPT
+document as a file of its own, `NAME.dapt.ttml`. Each vector is a room's event stream and the
+records of this extension, with the outcome §8 gives them and, when accepted, every figure. It
+has:
+
+- **accepted sessions**: a lesson with a human captioner, a machine captioner whose partials
+  are revised to final, a capture take placing the machine captions' words, a reference
+  transcript, a quality record for each track, a description voiced on a separate track, a
+  motion-captured signer bound to the human captions with an approved review, and a claim over
+  all of them held to the 2024 statement's mean; a session whose machine captions a person
+  reviews, with a description the sink voices by a pinned model, the video of a signer, and a
+  claim without latency bounds; and a session with no sources, whose latency class is `none`;
+- **negative controls**, each a copy of an accepted session with one defect, and each refused
+  with its reason: a latency figure misstated, a broken revision chain, a sign track bound to a
+  revision a later one superseded and to a revision the stream does not hold, a description
+  spoken late and one spoken early, a claim over a track the verifier does not hold, and one
+  for every other reason of §10.
+
+A conforming verifier gives every vector the outcome, the reason, the place and every figure
+the corpus states, and writes every DAPT document byte for byte. `wai_access_services_vectors
+verify` and the test `tests/access_services.rs` check that every file regenerates byte for
+byte, that no other file is there, that `wai-rs` gives every vector its outcome, that every
+reason of §10 refuses a vector, and that §10 lists exactly the reference's codes.
+`live-conformance/access_services_verify.py` is the second implementation, written from this
+text: it shares no code with `wai-rs`; it verifies events and captions with the timed-text
+corpus's second implementation (`timed_text_verify.py`) and signatures with WAI's strict rule
+(`claim-conformance/_ed25519.py`); it computes every figure, writes every DAPT document and
+parses each with an XML parser; and it requires every mutated copy of the corpus to fail.
+
+## 12. Security and privacy considerations
+
+- Every figure is recomputed from signed records. A figure states nothing a verifier takes on
+  trust; a quality record's signer vouches only that it computed the figure, and a verifier
+  that recomputes it needs no trust in the signer.
+- A source places words on the room clock as its signer states. On a take, the media's time is
+  the device's signed commitment and cannot be moved; where a word lies in the media is the
+  aligner's statement, attributable to it by its signature, and checkable by anyone holding the
+  master. A source on the basis `room` places the words by the signer's word alone, and the
+  latency's class says so (`stated`).
+- A take's opening commitment is the device's, but a principal that is not a capturing device
+  can sign one too. This extension requires the take to be derived from a `record_start`
+  addressed to the commitment's author; that the author was permitted to capture, and for
+  whom, is what a take verifier and a room verifier check (capture-binding §9, live-rooms §9).
+- `t` is its author's statement of the room clock (live-events §11). A captioner who stamps
+  its captions early lowers its latency, and the stamp is signed: the room's relays see when
+  each event arrived, and a later extension's per-hop receipts witness it.
+- A reference transcript is its reviewer's. The accuracy's class names what the reference is;
+  a verifier's policy decides whose transcripts it accepts.
+- Labels are their producers' statements, as timed-text §14 says of captions. A description
+  or a signing labelled human that a model produced misleads its audience, and the signature
+  makes that attributable.
+- A signing track's binding names caption revisions by digest. It shows what the signing
+  translates; it does not show that the translation is correct, which a review states.
+- A sources record ties a cue to a position in a recording, and a signing record ties a track
+  to a person who signs. Both persist with the session's records, as the events do.
diff --git a/wai/extensions/timed-text.md b/wai/extensions/timed-text.md
index d5d3829ac..b99e25865 100644
--- a/wai/extensions/timed-text.md
+++ b/wai/extensions/timed-text.md
@@ -48,8 +48,10 @@ disclosure label in every target (§10); and what a WAI player owes its viewers
 Out of scope: a transport; speech recognition and translation, which produce the text; the
 fragmented MP4 packaging of an IMSC1 rendition (HLS `draft-pantos-hls-rfc8216bis-22` §3.1.5
 and ISO/IEC 14496-30 carry the document §6 writes); the paint-on style of 608, colours,
-underline and flash; audio description; and a sink's own rendering of text, beyond §4.4
-and §11.
+underline and flash; audio description, which [access-services](access-services.md) §5
+defines, with sign language and figures of a caption track's latency, stability and accuracy
+computed from its revisions (§4 there); and a sink's own rendering of text, beyond §4.4 and
+§11.
 
 Relationship to the core spec: `wai.text.timed` is a **record** ([SPEC](../SPEC.md) §5).
 Its unit is the signed caption revision, and the documents this extension writes are
diff --git a/wai/live-conformance/README.md b/wai/live-conformance/README.md
index 33895b784..55ddeae1c 100644
--- a/wai/live-conformance/README.md
+++ b/wai/live-conformance/README.md
@@ -22,6 +22,7 @@ and the independent verifier of each, beside it.
 | [`usage/`](usage/) | [ai-usage](../extensions/ai-usage.md) (`wai.ai.usage`) | `wai_ai_usage_vectors gen` | `ai_usage_verify.py` |
 | [`contribution/`](contribution/) | [contribution](../extensions/contribution.md) (`wai.media.contribution`) | `wai_contribution_vectors gen` | `contribution_verify.py` |
 | [`settlement/`](settlement/) | [settlement](../extensions/settlement.md) (`wai.delivery.settlement`) | `wai_settlement_vectors gen` | `settlement_verify.py` |
+| [`access/`](access/) | [access-services](../extensions/access-services.md) (`wai.access.services`) | `wai_access_services_vectors gen` | `access_services_verify.py` |
 
 **Provenance.** Generated here: each directory's corpus is written by its row's generator
 (`gen`, in `wai/wai-rs`), from records authored in code and from fixed seeds, and each
@@ -44,6 +45,7 @@ python3 capture_take_verify.py takes
 python3 live_compose_verify.py compose
 python3 live_record_verify.py recordings
 python3 timed_text_verify.py captions
+python3 access_services_verify.py access
 python3 live_metering_verify.py metering
 python3 energy_steering_verify.py steering
 python3 live_moderation_verify.py moderation
diff --git a/wai/live-conformance/access/README.md b/wai/live-conformance/access/README.md
new file mode 100644
index 000000000..7063fb3ff
--- /dev/null
+++ b/wai/live-conformance/access/README.md
@@ -0,0 +1,46 @@
+# live-conformance/access — access services
+
+The corpus of [`extensions/access-services.md`](../../extensions/access-services.md) §11: room
+sessions whose captions are `WEV1` events with their `WTX1` annotations, and the records of the
+extension beside them: sources, reference transcripts, quality figures, audio descriptions,
+signings, reviews and completeness claims, each a JSON text signed under `wai:access`.
+
+**Access-services equivalence.** For each vector, a conforming verifier of the corpus's room,
+offered the events of the vector's `stream` in the order given and then its `records` (§8.1),
+reaches the outcome the vector states (§8.2): `refuse`, with `at` (`events` or `record`), the
+`index` of the record and the `reason`; or `accept`, with the `figures`: each whole caption
+track's figure (§4.7), each description's events, voiced events and offsets (§5.3), each
+signing's segments, revisions named, offsets and video floor (§6.3), and each claim's dialogue
+overlap (§7.2). Signed integers are written as strings. For each entry of `documents`, the
+description record it names maps, with the voicing track's `uri` and `type`, onto the DAPT
+document in `file` byte for byte (§5.5), or is refused with `reason`. A verifier that reaches
+another outcome, place, reason, figure or byte does not conform.
+
+**Provenance.** Generated here: `wai_access_services_vectors gen` writes `vectors.json` and
+each DAPT document from events and records authored in code, from fixed seeds. Each key,
+model, track and object digest is SHA-256 of a fixed label and an index, the room id
+likewise, every time is a constant, and Ed25519 signing is deterministic (RFC 8032), so every
+file is the same bytes on every machine. The captions, descriptions and transcripts are
+written for the corpus, in English. The objects a signing names are digests only: no pose
+stream, video or audio is in the corpus. The generator asserts, before it writes, that each
+vector reaches the outcome it was written to have and that every reason of §10 refuses a
+case. No recorded data.
+
+## Layout
+
+- `vectors.json`: `room`, `pt0_ms`, `principals` (the event authors `captioner`, `asr`,
+  `host` and `device`, and the record signers), `streams` (each a list of `WEV1` records in
+  lowercase hexadecimal: `lesson`, `reviewed`, and three defective copies of the lesson),
+  `vectors` (each with `name`, `note`, `stream`, `records` and its outcome) and `documents`.
+- `NAME.dapt.ttml`: the DAPT document of vector `NAME`'s description.
+
+## Checking
+
+```
+cargo run --no-default-features --features access_services --bin wai_access_services_vectors -- verify ../live-conformance/access
+python3 -I access_services_verify.py access
+```
+
+The first runs from `wai-rs/`, the second from `live-conformance/`. The second is the
+corpus's second implementation, written from the extension's text; it shares no code with
+`wai-rs`.
diff --git a/wai/live-conformance/access/lesson.dapt.ttml b/wai/live-conformance/access/lesson.dapt.ttml
new file mode 100644
index 000000000..5b4cb484a
--- /dev/null
+++ b/wai/live-conformance/access/lesson.dapt.ttml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tt xmlns="http://www.w3.org/ns/ttml" xmlns:ttp="http://www.w3.org/ns/ttml#parameter" xmlns:tta="http://www.w3.org/ns/ttml#audio" xmlns:daptm="http://www.w3.org/ns/ttml/profile/dapt#metadata" xmlns:wai="tag:transaction.science,2026:wai/access" xml:lang="en" ttp:contentProfiles="http://www.w3.org/ns/ttml/profile/dapt1.0/content" daptm:langSrc="zxx" daptm:scriptRepresents="visual.nonText visual.text" daptm:scriptType="asRecorded" wai:script="human" wai:voice="machine" wai:voice-model="1c1172ff98d71af4286f2a67fa50ccf58dedcfd642a1974ebbcc1cbaff53848f">
+<body>
+<div xml:id="d1" begin="00:00:10.500" end="00:00:11.900" daptm:represents="visual.nonText">
+<animate begin="00:00:00.000" end="00:00:00.200" tta:gain="1;0.4" fill="freeze"/>
+<animate begin="00:00:01.200" end="00:00:01.400" tta:gain="0.4;1"/>
+<p><span begin="00:00:00.220" end="00:00:01.190"><audio src="https://media.example/lesson/description.mp4" type="audio/mp4" clipBegin="00:00:10.720" clipEnd="00:00:11.690"/>A teacher stands beside a tide chart.</span></p>
+</div>
+<div xml:id="d2" begin="00:00:15.200" end="00:00:16.000" daptm:represents="visual.text">
+<p><span begin="00:00:00.010" end="00:00:00.790"><audio src="https://media.example/lesson/description.mp4" type="audio/mp4" clipBegin="00:00:15.210" clipEnd="00:00:15.990"/>On the board: HIGH TIDE 06:10.</span></p>
+</div>
+</body>
+</tt>
diff --git a/wai/live-conformance/access/reviewed.dapt.ttml b/wai/live-conformance/access/reviewed.dapt.ttml
new file mode 100644
index 000000000..cc2e3fb0f
--- /dev/null
+++ b/wai/live-conformance/access/reviewed.dapt.ttml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tt xmlns="http://www.w3.org/ns/ttml" xmlns:ttp="http://www.w3.org/ns/ttml#parameter" xmlns:tta="http://www.w3.org/ns/ttml#audio" xmlns:daptm="http://www.w3.org/ns/ttml/profile/dapt#metadata" xmlns:wai="tag:transaction.science,2026:wai/access" xml:lang="en" ttp:contentProfiles="http://www.w3.org/ns/ttml/profile/dapt1.0/content" daptm:langSrc="zxx" daptm:scriptRepresents="visual.nonText visual.text.title" daptm:scriptType="preRecording" wai:script="machine" wai:script-model="cd01c4b4a40ca82e51f554a0d17cba629c8e828c960c3f3f396b232419bcedb2" wai:voice="machine-reviewed" wai:voice-model="78735f2962641be6afd75736236889f0fb4eab577c9b29d4c6e0c1de32ee7879">
+<body>
+<div xml:id="r1" begin="00:00:11.000" end="00:00:12.200" daptm:represents="visual.nonText">
+<animate begin="00:00:00.000" end="00:00:00.150" tta:gain="1;0.5" fill="freeze"/>
+<animate begin="00:00:01.050" end="00:00:01.200" tta:gain="0.5;1"/>
+<p><span tta:speak="normal">Divers swim over a reef.</span></p>
+</div>
+<div xml:id="r2" begin="00:00:14.000" end="00:00:15.000" daptm:represents="visual.text.title">
+<p><span tta:speak="normal">Title:<br/>Reef Tour &amp; Co.</span></p>
+</div>
+</body>
+</tt>
diff --git a/wai/live-conformance/access/vectors.json b/wai/live-conformance/access/vectors.json
new file mode 100644
index 000000000..d249804a9
--- /dev/null
+++ b/wai/live-conformance/access/vectors.json
@@ -0,0 +1,1116 @@
+{
+  "corpus": "wai.access.services",
+  "extension": "extensions/access-services.md",
+  "room": "10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187",
+  "pt0_ms": 10000,
+  "principals": {
+    "captioner": "87af91802eaf620fff36e32f2e4249dec47917281f908fb97e36d6105e586fbe",
+    "asr": "56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001",
+    "host": "2d3a54bbd6d60dc802d225efd0ac4fc7dc4f65825bbce115cd9da3b9b84f5b20",
+    "device": "ab92805903180964e9625a4f13685fdc7c7cc50c64f7ed0bbebb4f2d7736de14",
+    "aligner": "263a17b821ed45337377e8de5823caf19eed3894af1810899e1c43a278f75956",
+    "reviewer": "e5ce9e9b473a9db90a3a9ca1a0490575357862fad16166b943a43ecf09c4a4e9",
+    "describer": "b247ef25a66372d4485c83c4f66e508d15550dfcb04ea6d2e8e50a6dd10b8444",
+    "interpreter": "95c12b988c8cf5df861c02b7aba75dd996d90348aaeaeef09e8966fd7d1a972f",
+    "vendor": "52c5abb2a1bb06da81afd4243f30a990c5c32071c1d3b405439945356b2ec130",
+    "authority": "fc940ff52466a0f214c46f7f204e8700eed7266c7ac1d1b113ae06393b16db23"
+  },
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+      ],
+      "outcome": "refuse",
+      "at": "record",
+      "index": 7,
+      "reason": "figure_mismatch"
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+      "note": "a description's voice starts 46 ms after the programme audio has fallen",
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+      "outcome": "refuse",
+      "at": "record",
+      "index": 3,
+      "reason": "description_out_of_sync"
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+    {
+      "name": "description_runs_on",
+      "note": "a description's voice ends 46 ms after the programme audio has risen",
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+      "outcome": "refuse",
+      "at": "record",
+      "index": 4,
+      "reason": "sign_revision_unknown"
+    },
+    {
+      "name": "claim_missing_track",
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+      "outcome": "refuse",
+      "at": "record",
+      "index": 5,
+      "reason": "record_malformed"
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+    {
+      "name": "negative_number",
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+      "stream": "lesson",
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+      "outcome": "refuse",
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+    {
+      "name": "second_sources",
+      "note": "a second sources record for the machine captions",
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+      "reason": "text_not_in_subset"
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+      "reason": "reference_unknown"
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+      "outcome": "refuse",
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+      "reason": "reference_incomplete"
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+    {
+      "name": "quality_without_reference",
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+      "stream": "lesson",
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+      "outcome": "refuse",
+      "at": "record",
+      "index": 7,
+      "reason": "figure_inputs_mismatch"
+    },
+    {
+      "name": "description_overlap",
+      "note": "a description begins before the one before it ends",
+      "stream": "lesson",
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+      "outcome": "refuse",
+      "at": "record",
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+      "reason": "signing_malformed"
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+    {
+      "name": "review_unknown_signing",
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+      "outcome": "refuse",
+      "at": "record",
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+    {
+      "name": "latency_above_bound",
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+      "outcome": "refuse",
+      "at": "record",
+      "index": 1,
+      "reason": "stream_incomplete"
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+    {
+      "name": "sign_partial",
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+      "records": [
+        "{\"events\":[{\"begin\":11000,\"duck\":{\"gain\":500,\"ramp\":150},\"end\":12200,\"id\":\"r1\",\"represents\":\"visual.nonText\",\"text\":\"Divers swim over a reef.\",\"voice\":null},{\"begin\":14000,\"duck\":{\"gain\":1000,\"ramp\":0},\"end\":15000,\"id\":\"r2\",\"represents\":\"visual.text.title\",\"text\":\"Title:\\nReef Tour & Co.\",\"voice\":null}],\"kind\":\"wai-description\",\"lang\":\"en\",\"script\":{\"model\":\"cd01c4b4a40ca82e51f554a0d17cba629c8e828c960c3f3f396b232419bcedb2\",\"origin\":\"machine\"},\"sig\":\"72a89943dfa20e184f574c63ab0c51257da815dced6fe7eb459e53c590863ba0693958d673542a28b1427afd5b65dfaafc77305c5ae08b69cf64f96a1b05bf04\",\"signer_pubkey\":\"b247ef25a66372d4485c83c4f66e508d15550dfcb04ea6d2e8e50a6dd10b8444\",\"voicing\":{\"form\":\"sink\",\"model\":\"78735f2962641be6afd75736236889f0fb4eab577c9b29d4c6e0c1de32ee7879\",\"origin\":\"machine-reviewed\",\"track\":null}}",
+        "{\"form\":\"video\",\"kind\":\"wai-signing\",\"lang\":\"ase\",\"model\":\"3978c5b3911274bc05898b55b7231ed8b2c333cf9cea930ad28414983baafacc\",\"origin\":\"machine\",\"room\":\"10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187\",\"segments\":[{\"end\":5000000,\"object\":\"1150c555c08fef06ef997f730bea23e3789b05712cf1a143070e53dbfbf4f33e\",\"revisions\":[\"c718cf034cb47537cddb3e30febd1dc7c1e5d44d818e818e9067793f15e85ab9\"],\"start\":3000000},{\"end\":8200000,\"object\":\"eaee76d570d9135f2d935ea86c72508d5bf12a857fecadb61db66eecc5bba415\",\"revisions\":[\"692449658943f2343ceed5f7acecc70c454e00d688fe027f5d882ad9ea403eaf\"],\"start\":6500000}],\"sig\":\"bd605aacc77d89130a74425f90af1dc816a7b36ecd0221b129995eeb390658c0cb3eefb43e6925df2907c8f4a016b4f353bc188840a87f4849de4ac263d28d00\",\"signer_pubkey\":\"95c12b988c8cf5df861c02b7aba75dd996d90348aaeaeef09e8966fd7d1a972f\",\"source\":\"56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001\",\"track\":\"1a90b39e6fc282ee2e5e8a2136e1586219fca76c8e0c35ce294e452a1eca25fe\",\"video\":{\"height\":360,\"rate_den\":1,\"rate_num\":25,\"width\":640}}",
+        "{\"accuracy\":{\"class\":\"reviewed\",\"final\":null,\"first\":{\"deletions\":0,\"errors\":0,\"insertions\":0,\"substitutions\":0,\"words\":6}},\"cues\":2,\"events\":\"7f6cc36bf6e2b663a53ecdc52a30db1b4882c3d4415b4bee6034d6ab6bcf4127\",\"kind\":\"wai-caption-quality\",\"latency\":{\"class\":\"none\",\"max\":null,\"mean\":null,\"min\":null,\"n\":0,\"p50\":null,\"p95\":null},\"principal\":\"56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001\",\"reference\":null,\"room\":\"10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187\",\"sig\":\"ece138c262789855e0836b0000fa7ef9ed336dee529fdd438f6e0271098023d9dae2b0b17e7752b323e7e6c49f92eca5664be774c7a7f8362a434051f1a94c0d\",\"signer_pubkey\":\"52c5abb2a1bb06da81afd4243f30a990c5c32071c1d3b405439945356b2ec130\",\"sources\":null,\"stability\":{\"cues_corrected\":0,\"revisions\":1,\"words_changed\":0}}",
+        "{\"from\":0,\"kind\":\"wai-access-completeness\",\"pt0\":10000,\"room\":\"10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187\",\"sig\":\"6d4f8c60647ba7e6555060b365bf3d5e8da0bbece085d596f48daf904dc0d25b85a0a2fbf429fea7323637bc94f36cb64c36d585dcd46af465a615634d9b540a\",\"signer_pubkey\":\"fc940ff52466a0f214c46f7f204e8700eed7266c7ac1d1b113ae06393b16db23\",\"to\":10000000,\"tracks\":[{\"lang\":\"en\",\"latency_max\":null,\"latency_mean_max\":null,\"principal\":\"56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001\",\"service\":\"captions\"},{\"lang\":\"en\",\"record\":\"bdb2f87aa1b43ff97c23edc8c7adb13d28b2f161d8863fe71eba71507c62e67d\",\"service\":\"audio-description\"},{\"lang\":\"ase\",\"offset_max\":null,\"record\":\"709b72ba2870096354b9a52500944052a13407a77ea3c9432fd46030eb718fd9\",\"review\":null,\"service\":\"sign-language\"}]}"
+      ],
+      "outcome": "refuse",
+      "at": "record",
+      "index": 1,
+      "reason": "sign_revision_not_final"
+    },
+    {
+      "name": "latency_unmeasured",
+      "note": "the claim bounds the latency of captions no sources record places",
+      "stream": "reviewed",
+      "records": [
+        "{\"events\":[{\"begin\":11000,\"duck\":{\"gain\":500,\"ramp\":150},\"end\":12200,\"id\":\"r1\",\"represents\":\"visual.nonText\",\"text\":\"Divers swim over a reef.\",\"voice\":null},{\"begin\":14000,\"duck\":{\"gain\":1000,\"ramp\":0},\"end\":15000,\"id\":\"r2\",\"represents\":\"visual.text.title\",\"text\":\"Title:\\nReef Tour & Co.\",\"voice\":null}],\"kind\":\"wai-description\",\"lang\":\"en\",\"script\":{\"model\":\"cd01c4b4a40ca82e51f554a0d17cba629c8e828c960c3f3f396b232419bcedb2\",\"origin\":\"machine\"},\"sig\":\"72a89943dfa20e184f574c63ab0c51257da815dced6fe7eb459e53c590863ba0693958d673542a28b1427afd5b65dfaafc77305c5ae08b69cf64f96a1b05bf04\",\"signer_pubkey\":\"b247ef25a66372d4485c83c4f66e508d15550dfcb04ea6d2e8e50a6dd10b8444\",\"voicing\":{\"form\":\"sink\",\"model\":\"78735f2962641be6afd75736236889f0fb4eab577c9b29d4c6e0c1de32ee7879\",\"origin\":\"machine-reviewed\",\"track\":null}}",
+        "{\"form\":\"video\",\"kind\":\"wai-signing\",\"lang\":\"ase\",\"model\":\"3978c5b3911274bc05898b55b7231ed8b2c333cf9cea930ad28414983baafacc\",\"origin\":\"machine\",\"room\":\"10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187\",\"segments\":[{\"end\":5000000,\"object\":\"1150c555c08fef06ef997f730bea23e3789b05712cf1a143070e53dbfbf4f33e\",\"revisions\":[\"a490a6ff974eba5f5e101a8cc6ebe555611fb6c8efc33649b38f1eb3eb157212\"],\"start\":3000000},{\"end\":8200000,\"object\":\"eaee76d570d9135f2d935ea86c72508d5bf12a857fecadb61db66eecc5bba415\",\"revisions\":[\"692449658943f2343ceed5f7acecc70c454e00d688fe027f5d882ad9ea403eaf\"],\"start\":6500000}],\"sig\":\"0a3f86fae6da5138e81e8419cc290bef1ea8669ec2d1d0b8cc970f68ecea07ff94224e846ec1919b95eba9751dcf90ebb66df9bb71c39f4239da5eaaf30bc706\",\"signer_pubkey\":\"95c12b988c8cf5df861c02b7aba75dd996d90348aaeaeef09e8966fd7d1a972f\",\"source\":\"56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001\",\"track\":\"1a90b39e6fc282ee2e5e8a2136e1586219fca76c8e0c35ce294e452a1eca25fe\",\"video\":{\"height\":360,\"rate_den\":1,\"rate_num\":25,\"width\":640}}",
+        "{\"accuracy\":{\"class\":\"reviewed\",\"final\":null,\"first\":{\"deletions\":0,\"errors\":0,\"insertions\":0,\"substitutions\":0,\"words\":6}},\"cues\":2,\"events\":\"7f6cc36bf6e2b663a53ecdc52a30db1b4882c3d4415b4bee6034d6ab6bcf4127\",\"kind\":\"wai-caption-quality\",\"latency\":{\"class\":\"none\",\"max\":null,\"mean\":null,\"min\":null,\"n\":0,\"p50\":null,\"p95\":null},\"principal\":\"56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001\",\"reference\":null,\"room\":\"10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187\",\"sig\":\"ece138c262789855e0836b0000fa7ef9ed336dee529fdd438f6e0271098023d9dae2b0b17e7752b323e7e6c49f92eca5664be774c7a7f8362a434051f1a94c0d\",\"signer_pubkey\":\"52c5abb2a1bb06da81afd4243f30a990c5c32071c1d3b405439945356b2ec130\",\"sources\":null,\"stability\":{\"cues_corrected\":0,\"revisions\":1,\"words_changed\":0}}",
+        "{\"from\":0,\"kind\":\"wai-access-completeness\",\"pt0\":10000,\"room\":\"10cad9729a9f0c2b69c529091ff2989cfe519ebf468e9b3017b55116a7e74187\",\"sig\":\"731fd8e154657e55a158253c20b042af4702eb2ca4e9e801c7d195306474391207c87a3dc0207ccdb6da55de873fb5f7cb25be8ec343c55b73badc4a1ccf150d\",\"signer_pubkey\":\"fc940ff52466a0f214c46f7f204e8700eed7266c7ac1d1b113ae06393b16db23\",\"to\":10000000,\"tracks\":[{\"lang\":\"en\",\"latency_max\":null,\"latency_mean_max\":4500000,\"principal\":\"56fd6f25954aef31b842f11382e706ba52e92606b196afd58855db637edb7001\",\"service\":\"captions\"},{\"lang\":\"en\",\"record\":\"bdb2f87aa1b43ff97c23edc8c7adb13d28b2f161d8863fe71eba71507c62e67d\",\"service\":\"audio-description\"},{\"lang\":\"ase\",\"offset_max\":null,\"record\":\"0f40a4a72dd8d04b012920ba1d01d670f27c11e5d7f2e3404c87094830236ec4\",\"review\":null,\"service\":\"sign-language\"}]}"
+      ],
+      "outcome": "refuse",
+      "at": "record",
+      "index": 3,
+      "reason": "sync_unmeasured"
+    }
+  ],
+  "documents": [
+    {
+      "vector": "lesson",
+      "record": 3,
+      "uri": "https://media.example/lesson/description.mp4",
+      "type": "audio/mp4",
+      "file": "lesson.dapt.ttml"
+    },
+    {
+      "vector": "reviewed",
+      "record": 0,
+      "uri": null,
+      "type": null,
+      "file": "reviewed.dapt.ttml"
+    },
+    {
+      "vector": "lesson",
+      "record": 3,
+      "uri": "https://media.example/a\"b",
+      "type": "audio/mp4",
+      "reason": "parameter_malformed"
+    },
+    {
+      "vector": "lesson",
+      "record": 3,
+      "uri": "https://media.example/lesson/description.mp4",
+      "type": "",
+      "reason": "parameter_malformed"
+    }
+  ]
+}
diff --git a/wai/live-conformance/access_services_verify.py b/wai/live-conformance/access_services_verify.py
new file mode 100644
index 000000000..af207c084
--- /dev/null
+++ b/wai/live-conformance/access_services_verify.py
@@ -0,0 +1,990 @@
+#!/usr/bin/env python3
+"""Independent verifier of the access-services corpus (extensions/access-services.md).
+
+Written from the extension's text. It shares no code with wai-rs, which generates the
+corpus, and never runs it. It verifies every event and the captions in it with
+timed_text_verify.py (this directory), the timed-text corpus's second implementation, which
+verifies events with live_events_verify.py; checks every record's signature with
+../claim-conformance/_ed25519.py, WAI's strict Ed25519 rule written from RFC 8032; and writes
+everything else from the extension's sections:
+
+- the records (§2): a strict JSON reading, each record's shape from the tables, its JCS
+  form, its signature and its record id;
+- words and their alignment (§3), with the walk back of §3.2;
+- caption quality (§4): the tracks and cues, sources placed through a take's opening
+  commitment, reference transcripts, latency, stability and accuracy, and the check of a
+  stated figure;
+- audio description (§5): the rules, the synchronisation bounds, the overlap with dialogue,
+  and the DAPT document, written byte for byte and parsed with xml.etree;
+- sign language (§6): the rules, the binding to final revisions, offsets and the video
+  floor, and reviews;
+- the completeness claim (§7) and verification (§8).
+
+For every vector it requires the outcome, place, reason and figures the corpus states; for
+every document, its bytes or its refusal; that every reason of §10 (read from the extension)
+refuses a case; and that every mutated copy of the corpus fails.
+
+    python3 -I access_services_verify.py <live-conformance/access>
+
+Exit status 0 only if every case verifies. Python 3.8 or later; standard library only.
+"""
+import copy
+import hashlib
+import json
+import os
+import re
+import sys
+import xml.etree.ElementTree as ET
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, HERE)
+sys.path.insert(0, os.path.join(HERE, "..", "claim-conformance"))
+import timed_text_verify as TT  # noqa: E402
+import live_events_verify as LEV  # noqa: E402
+import _ed25519 as ED  # noqa: E402
+
+EXTENSION = os.path.join(HERE, "..", "extensions", "access-services.md")
+SIGN_DOMAIN = b"wai:access\x01"
+MAX_SAFE = (1 << 53) - 1
+MAX_MS = 359999999
+NS_WAI = "tag:transaction.science,2026:wai/access"
+NS_TT = "http://www.w3.org/ns/ttml"
+NS_TTA = "http://www.w3.org/ns/ttml#audio"
+NS_TTP = "http://www.w3.org/ns/ttml#parameter"
+NS_DAPTM = "http://www.w3.org/ns/ttml/profile/dapt#metadata"
+NS_XML = "http://www.w3.org/XML/1998/namespace"
+DAPT_CONTENT = "http://www.w3.org/ns/ttml/profile/dapt1.0/content"
+CAPTION, CONTROL, TAKE_COMMIT = 0x0A, 0x09, 0x0C
+
+
+class Refused(Exception):
+    def __init__(self, reason):
+        super().__init__(reason)
+        self.reason = reason
+
+
+def reasons_of_extension():
+    """The codes of §10's table, in order."""
+    text = open(EXTENSION, encoding="utf-8").read()
+    at = text.index("\n## 10. Reasons")
+    end = text.find("\n## ", at + 1)
+    body = text[at:end if end >= 0 else len(text)]
+    return [l.split("`")[1] for l in body.split("\n") if l.startswith("| `")]
+
+
+# ---------------------------------------------------------------- §2 records
+
+class _Bad:
+    """A JSON number this extension's records may not hold."""
+
+
+BAD = _Bad()
+
+
+def _no_dupes(pairs):
+    out = {}
+    for k, v in pairs:
+        if k in out:
+            raise Refused("record_malformed")
+        out[k] = v
+    return out
+
+
+def _clean(v, depth):
+    if depth > 32:
+        raise Refused("record_malformed")
+    if isinstance(v, str):
+        if any(0xD800 <= ord(c) <= 0xDFFF for c in v):
+            raise Refused("record_malformed")
+    elif isinstance(v, list):
+        for x in v:
+            _clean(x, depth + 1)
+    elif isinstance(v, dict):
+        for k, x in v.items():
+            _clean(k, depth)
+            _clean(x, depth + 1)
+
+
+def read_json(text):
+    """jwp-receipts §3.1 step 1's reading: no BOM, no repeated member, no lone surrogate, at
+    most 32 levels. A number with a sign, a fraction or an exponent is kept as BAD."""
+    if text.startswith(""):
+        raise Refused("record_malformed")
+    try:
+        v = json.loads(text, object_pairs_hook=_no_dupes,
+                       parse_int=lambda s: BAD if s.startswith("-") else int(s),
+                       parse_float=lambda s: BAD,
+                       parse_constant=lambda s: BAD)
+    except Refused:
+        raise
+    except ValueError:
+        raise Refused("record_malformed")
+    _clean(v, 1)
+    return v
+
+
+HEX = re.compile(r"[0-9a-f]*")
+SINT = re.compile(r"0|-?[1-9][0-9]*")
+
+
+def is_hex(v, n):
+    return isinstance(v, str) and len(v) == 2 * n and HEX.fullmatch(v) is not None
+
+
+def is_int(v):
+    return type(v) is int and 0 <= v <= MAX_SAFE
+
+
+def is_sint(v):
+    return isinstance(v, str) and SINT.fullmatch(v) is not None and -(1 << 63) <= int(v) < (1 << 63)
+
+
+# A type: "hex32", "hex64", "int", "sint", "str", ("one", [...]), ("obj", table),
+# ("arr", type), ("null", type).
+ORIGINS = ["human", "machine", "machine-reviewed"]
+REPRESENTS = ["visual", "visual.nonText", "visual.text", "visual.text.title", "visual.text.credit",
+              "visual.text.location", "visual.dialogue"]
+SIG = [("signer_pubkey", "hex32"), ("sig", "hex64")]
+SOURCES = [("kind", ("one", ["wai-caption-sources"])), ("room", "hex32"), ("principal", "hex32"),
+           ("sources", ("arr", ("obj", [("cue", "hex32"), ("basis", ("one", ["take", "room"])), ("take", ("null", "hex32")),
+                                        ("start", "int"), ("end", "int")])))] + SIG
+REFERENCE = [("kind", ("one", ["wai-caption-reference"])), ("room", "hex32"), ("principal", "hex32"),
+             ("entries", ("arr", ("obj", [("cue", "hex32"), ("text", "str")])))] + SIG
+COUNTS = ("obj", [("words", "int"), ("errors", "int"), ("substitutions", "int"), ("deletions", "int"), ("insertions", "int")])
+QUALITY = [("kind", ("one", ["wai-caption-quality"])), ("room", "hex32"), ("principal", "hex32"), ("events", "hex32"),
+           ("sources", ("null", "hex32")), ("reference", ("null", "hex32")), ("cues", "int"),
+           ("latency", ("obj", [("class", ("one", ["none", "capture", "stated"])), ("n", "int")] +
+                        [(k, ("null", "sint")) for k in ("min", "max", "mean", "p50", "p95")])),
+           ("stability", ("obj", [("revisions", "int"), ("words_changed", "int"), ("cues_corrected", "int")])),
+           ("accuracy", ("obj", [("class", ("one", ["transcript", "reviewed", "self"])), ("first", COUNTS), ("final", ("null", COUNTS))]))] + SIG
+DESCRIPTION = [("kind", ("one", ["wai-description"])), ("lang", "str"),
+               ("script", ("obj", [("origin", ("one", ORIGINS)), ("model", ("null", "hex32"))])),
+               ("voicing", ("obj", [("form", ("one", ["track", "sink"])), ("origin", ("one", ORIGINS)),
+                                    ("model", ("null", "hex32")), ("track", ("null", "hex32"))])),
+               ("events", ("arr", ("obj", [("id", "str"), ("begin", "int"), ("end", "int"), ("represents", ("one", REPRESENTS)),
+                                           ("text", "str"), ("duck", ("obj", [("gain", "int"), ("ramp", "int")])),
+                                           ("voice", ("null", ("obj", [("begin", "int"), ("end", "int")])))])))] + SIG
+SIGNING = [("kind", ("one", ["wai-signing"])), ("room", "hex32"), ("lang", "str"), ("source", "hex32"),
+           ("form", ("one", ["pose", "video"])), ("track", "hex32"), ("origin", ("one", ORIGINS)), ("model", ("null", "hex32")),
+           ("video", ("null", ("obj", [("width", "int"), ("height", "int"), ("rate_num", "int"), ("rate_den", "int")]))),
+           ("segments", ("arr", ("obj", [("object", "hex32"), ("start", "int"), ("end", "int"), ("revisions", ("arr", "hex32"))])))] + SIG
+REVIEW = [("kind", ("one", ["wai-signing-review"])), ("signing", "hex32"), ("scope", ("one", ["translation"])),
+          ("verdict", ("one", ["approved", "approved-with-notes", "rejected"])), ("notes", ("null", "hex32"))] + SIG
+TRACKS = {
+    "captions": [("service", ("one", ["captions"])), ("principal", "hex32"), ("lang", "str"),
+                 ("latency_mean_max", ("null", "int")), ("latency_max", ("null", "int"))],
+    "audio-description": [("service", ("one", ["audio-description"])), ("record", "hex32"), ("lang", "str")],
+    "sign-language": [("service", ("one", ["sign-language"])), ("record", "hex32"), ("lang", "str"),
+                      ("review", ("null", "hex32")), ("offset_max", ("null", "int"))],
+}
+CLAIM = [("kind", ("one", ["wai-access-completeness"])), ("room", "hex32"), ("from", "int"), ("to", "int"), ("pt0", "int"),
+         ("tracks", "tracks")] + SIG
+TABLES = {"wai-caption-sources": SOURCES, "wai-caption-reference": REFERENCE, "wai-caption-quality": QUALITY,
+          "wai-description": DESCRIPTION, "wai-signing": SIGNING, "wai-signing-review": REVIEW, "wai-access-completeness": CLAIM}
+
+
+def has_type(v, t):
+    if v is BAD:
+        return False
+    if t == "hex32":
+        return is_hex(v, 32)
+    if t == "hex64":
+        return is_hex(v, 64)
+    if t == "int":
+        return is_int(v)
+    if t == "sint":
+        return is_sint(v)
+    if t == "str":
+        return isinstance(v, str)
+    if t == "tracks":
+        return isinstance(v, list) and all(isinstance(x, dict) and x.get("service") in TRACKS and fits(x, TRACKS[x["service"]]) for x in v)
+    tag, arg = t
+    if tag == "one":
+        return isinstance(v, str) and v in arg
+    if tag == "obj":
+        return fits(v, arg)
+    if tag == "arr":
+        return isinstance(v, list) and all(has_type(x, arg) for x in v)
+    if tag == "null":
+        return v is None or has_type(v, arg)
+    raise AssertionError(t)
+
+
+def fits(v, table):
+    return isinstance(v, dict) and len(v) == len(table) and all(k in v and has_type(v[k], t) for k, t in table)
+
+
+def jcs(v):
+    """RFC 8785 over strings, unsigned integers, null, arrays and objects with ASCII member
+    names, which is what these records hold."""
+    return json.dumps(v, sort_keys=True, separators=(",", ":"), ensure_ascii=False).encode("utf-8")
+
+
+def read_record(text):
+    """§2: (kind, value, record id)."""
+    v = read_json(text)
+    if not isinstance(v, dict) or v.get("kind") not in TABLES or not fits(v, TABLES[v["kind"]]):
+        raise Refused("record_malformed")
+    body = {k: x for k, x in v.items() if k != "sig"}
+    bad = ED.verify(bytes.fromhex(v["signer_pubkey"]), SIGN_DOMAIN + jcs(body), bytes.fromhex(v["sig"]))
+    if bad is not None:
+        raise Refused(bad)
+    return v["kind"], v, hashlib.sha256(jcs(v)).digest()
+
+
+# ---------------------------------------------------------------- §3 words and alignment
+
+EDGE = "!\"'(),-.:;?[]¡«»¿–—‘’“”…"
+UPPER = {c: c + 0x20 for c in range(0x41, 0x5B)}
+
+
+def words(text):
+    out = []
+    for piece in re.split("[ \n]", text):
+        if piece == "":
+            continue
+        w = piece.translate(UPPER).strip(EDGE)
+        if w:
+            out.append(w)
+    return out
+
+
+def align(h, r, prefix):
+    """§3.2: (words, errors, substitutions, deletions, insertions)."""
+    m, n = len(h), len(r)
+    d = [[0] * (n + 1) for _ in range(m + 1)]
+    for j in range(n + 1):
+        d[0][j] = j
+    for i in range(m + 1):
+        d[i][0] = i
+    for i in range(1, m + 1):
+        for j in range(1, n + 1):
+            c = 0 if h[i - 1] == r[j - 1] else 1
+            d[i][j] = min(d[i - 1][j - 1] + c, d[i - 1][j] + 1, d[i][j - 1] + 1)
+    if prefix:
+        least = min(d[m])
+        end = max(j for j in range(n + 1) if d[m][j] == least)
+    else:
+        end = n
+    s = de = ins = 0
+    i, j = m, end
+    while i > 0 or j > 0:
+        if i > 0 and j > 0:
+            c = 0 if h[i - 1] == r[j - 1] else 1
+            if d[i][j] == d[i - 1][j - 1] + c:
+                s += c
+                i, j = i - 1, j - 1
+                continue
+        if i > 0 and d[i][j] == d[i - 1][j] + 1:
+            ins += 1
+            i -= 1
+        else:
+            de += 1
+            j -= 1
+    assert s + de + ins == d[m][end]
+    return [end, d[m][end], s, de, ins]
+
+
+def counts_json(c):
+    return {"words": c[0], "errors": c[1], "substitutions": c[2], "deletions": c[3], "insertions": c[4]}
+
+
+def add(a, b):
+    return [x + y for x, y in zip(a, b)]
+
+
+# ---------------------------------------------------------------- §4 the caption tracks
+
+class Stream:
+    def __init__(self, room, cap):
+        self.room, self.revs, self.accepted, self.gaps = room, cap.revs, cap.ev.accepted, cap.ev.gaps
+
+    def principals(self):
+        out = []
+        for r in self.revs:
+            if r["event"]["principal"] not in out:
+                out.append(r["event"]["principal"])
+        return out
+
+    def cues(self, p):
+        """§4.1: each cue as the positions of its revisions, first to last."""
+        out = []
+        for i, r in enumerate(self.revs):
+            if r["event"]["principal"] != p or r["sup"] is not None or r["sup_digest"] is not None:
+                continue
+            chain = [i]
+            while self.revs[chain[-1]]["by"] is not None:
+                chain.append(self.revs[chain[-1]]["by"])
+            out.append(chain)
+        return out
+
+    def head(self, c):
+        return self.revs[c[0]]["event"]["digest"]
+
+    def last(self, c):
+        return self.revs[c[-1]]
+
+    def whole(self, p):
+        cues = self.cues(p)
+        return (len(cues) > 0 and not any(g[0] == p for g in self.gaps)
+                and all(self.last(c)["final"] and not self.last(c)["unknown"] for c in cues))
+
+    def resolved(self, p):
+        return self.whole(p) and all(self.last(c)["duration"] > 0 for c in self.cues(p))
+
+    def events_digest(self, p):
+        mine = sorted((r for r in self.revs if r["event"]["principal"] == p), key=lambda r: r["event"]["seq"])
+        return hashlib.sha256(b"".join(r["event"]["digest"] for r in mine)).digest()
+
+    def take_offset(self, take):
+        """§4.2 rule 6: the offset of the take's opening commitment, when the take is derived."""
+        opening = None
+        for _, ev, p in self.accepted:
+            if ev["kind"] != TAKE_COMMIT:
+                continue
+            c = read_commit(p["bytes"])
+            if c is not None and c["take"] == take and c["n"] == 0 and c["phase"] == 1:
+                opening = (ev["principal"], c["offset"])
+                break
+        if opening is None:
+            return None
+        author, offset = opening
+        for _, ev, p in self.accepted:
+            if ev["kind"] == CONTROL and p["command"] == 1 and p["target"] == author:
+                if hashlib.sha256(b"wai:capture-take\x01" + self.room + author + ev["digest"]).digest() == take:
+                    return offset
+        return None
+
+    def intervals(self, p, pt0):
+        out = []
+        for c in self.cues(p):
+            h, l = self.revs[c[0]], self.last(c)
+            out.append((pt0 + h["event"]["t"] // 1000, pt0 + l["event"]["t"] // 1000 + l["duration"]))
+        return out
+
+
+def read_commit(b):
+    """capture-binding §5.1 and §5.2: a take_commit payload, or None when it does not read."""
+    if len(b) < 126:
+        return None
+    take, n, phase = b[0:32], int.from_bytes(b[32:36], "little"), b[36]
+    first, size = int.from_bytes(b[69:77], "little"), int.from_bytes(b[77:85], "little")
+    root, offset, k = b[85:117], int.from_bytes(b[117:125], "little", signed=True), b[125]
+    if phase not in (1, 2, 3) or size < first or k > 64 or len(b) != 126 + 32 * k or (size == 0 and root != bytes(32)):
+        return None
+    return {"take": take, "n": n, "phase": phase, "offset": offset}
+
+
+def floor_div(a, n):
+    return a // n
+
+
+class Run:
+    def __init__(self, stream, records):
+        self.s, self.records = stream, records          # records: [(kind, value, id)]
+        self.sources = {}                                # principal -> (id, {cue: (start, on_take)})
+        self.references = {}                             # principal -> (id, {cue: text})
+
+    def room_ok(self, v):
+        if bytes.fromhex(v["room"]) != self.s.room:
+            raise Refused("wrong_room")
+
+    def latencies(self, p, cues):
+        src = self.sources.get(p)
+        if src is None:
+            return []
+        out = []
+        for c in cues:
+            placed = src[1].get(self.s.head(c))
+            if placed is not None:
+                out.append((self.s.revs[c[0]]["event"]["t"] - placed[0], placed[1]))
+        return out
+
+    def figure(self, p):
+        s = self.s
+        cues = s.cues(p)
+        lat = sorted(x[0] for x in self.latencies(p, cues))
+        n = len(lat)
+        if n == 0:
+            latency = {"class": "none", "n": 0, "min": None, "max": None, "mean": None, "p50": None, "p95": None}
+        else:
+            def rank(q):
+                return lat[-(-q * n // 100) - 1]
+            on_take = all(x[1] for x in self.latencies(p, cues))
+            latency = {"class": "capture" if on_take else "stated", "n": n, "min": str(lat[0]), "max": str(lat[-1]),
+                       "mean": str(floor_div(sum(lat), n)), "p50": str(rank(50)), "p95": str(rank(95))}
+        revisions = changed_total = corrected = 0
+        for c in cues:
+            revisions += len(c) - 1
+            changed = 0
+            for a, b in zip(c, c[1:]):
+                al = align(words(s.revs[a]["text"]), words(s.revs[b]["text"]), False)
+                changed += al[2] + al[4]
+            changed_total += changed
+            corrected += 1 if changed > 0 else 0
+        ref = self.references.get(p)
+        if ref is not None:
+            cls = "transcript"
+        elif all(s.last(c)["origin"] in ("human", "machine-reviewed") for c in cues):
+            cls = "reviewed"
+        else:
+            cls = "self"
+        first, final = [0] * 5, [0] * 5
+        for c in cues:
+            rt = ref[1][s.head(c)] if ref is not None else s.last(c)["text"]
+            rw = words(rt)
+            first = add(first, align(words(s.revs[c[0]]["text"]), rw, True))
+            if ref is not None:
+                final = add(final, align(words(s.last(c)["text"]), rw, False))
+        src = self.sources.get(p)
+        return {"room": s.room.hex(), "principal": p.hex(), "events": s.events_digest(p).hex(),
+                "sources": None if src is None else src[0].hex(), "reference": None if ref is None else ref[0].hex(),
+                "cues": len(cues), "latency": latency,
+                "stability": {"revisions": revisions, "words_changed": changed_total, "cues_corrected": corrected},
+                "accuracy": {"class": cls, "first": counts_json(first), "final": counts_json(final) if ref is not None else None}}
+
+    def heads(self, p):
+        return [self.s.head(c) for c in self.s.cues(p)]
+
+    def earlier(self, at, kind, p):
+        return any(k == kind and bytes.fromhex(v["principal"]) == p for k, v, _ in self.records[:at])
+
+    # §4.2
+    def sources_rec(self, at):
+        _, v, rid = self.records[at]
+        self.room_ok(v)
+        p = bytes.fromhex(v["principal"])
+        if self.earlier(at, "wai-caption-sources", p):
+            raise Refused("record_conflict")
+        seen = set()
+        for e in v["sources"]:
+            if (e["basis"] == "take") != (e["take"] is not None) or e["start"] > e["end"] or e["cue"] in seen:
+                raise Refused("record_malformed")
+            seen.add(e["cue"])
+        if not self.s.whole(p):
+            raise Refused("stream_incomplete")
+        heads = self.heads(p)
+        if any(bytes.fromhex(e["cue"]) not in heads for e in v["sources"]):
+            raise Refused("source_unknown")
+        starts = {}
+        for e in v["sources"]:
+            if e["basis"] == "take":
+                o = self.s.take_offset(bytes.fromhex(e["take"]))
+                if o is None or e["start"] + o < 0:
+                    raise Refused("source_take_unknown")
+                starts[bytes.fromhex(e["cue"])] = (e["start"] + o, True)
+            else:
+                starts[bytes.fromhex(e["cue"])] = (e["start"], False)
+        self.sources.setdefault(p, (rid, starts))
+
+    # §4.3
+    def reference_rec(self, at):
+        _, v, rid = self.records[at]
+        self.room_ok(v)
+        p = bytes.fromhex(v["principal"])
+        if self.earlier(at, "wai-caption-reference", p):
+            raise Refused("record_conflict")
+        texts = {}
+        for e in v["entries"]:
+            if e["cue"] in texts:
+                raise Refused("record_malformed")
+            texts[e["cue"]] = e["text"]
+        if not all(TT.text_ok(t) for t in texts.values()):
+            raise Refused("text_not_in_subset")
+        if not self.s.whole(p):
+            raise Refused("stream_incomplete")
+        heads = self.heads(p)
+        if any(bytes.fromhex(k) not in heads for k in texts):
+            raise Refused("reference_unknown")
+        if any(h.hex() not in texts for h in heads):
+            raise Refused("reference_incomplete")
+        self.references.setdefault(p, (rid, {bytes.fromhex(k): t for k, t in texts.items()}))
+
+    # §4.7
+    def quality_rec(self, at):
+        _, v, _ = self.records[at]
+        self.room_ok(v)
+        p = bytes.fromhex(v["principal"])
+        if not self.s.whole(p):
+            raise Refused("stream_incomplete")
+        f = self.figure(p)
+        if any(v[k] != f[k] for k in ("events", "sources", "reference")):
+            raise Refused("figure_inputs_mismatch")
+        if any(v[k] != x for k, x in f.items()):
+            raise Refused("figure_mismatch")
+
+    # §6.2
+    def signing_rec(self, at):
+        _, v, _ = self.records[at]
+        self.room_ok(v)
+        machine = v["origin"] != "human"
+        ok = TT.lang_ok(v["lang"]) and machine == (v["model"] is not None) and (v["form"] == "video") == (v["video"] is not None)
+        if v["video"] is not None:
+            ok = ok and all(v["video"][k] > 0 for k in ("width", "height", "rate_num", "rate_den"))
+        segs = v["segments"]
+        ok = ok and len(segs) > 0
+        named = []
+        for i, sg in enumerate(segs):
+            ok = ok and sg["start"] < sg["end"] and len(sg["revisions"]) > 0 and (i == 0 or sg["start"] >= segs[i - 1]["end"])
+            named += sg["revisions"]
+        ok = ok and len(set(named)) == len(named)
+        if not ok:
+            raise Refused("signing_malformed")
+        src = bytes.fromhex(v["source"])
+        if not self.s.whole(src):
+            raise Refused("stream_incomplete")
+        mine = {r["event"]["digest"]: r for r in self.s.revs if r["event"]["principal"] == src}
+        if any(bytes.fromhex(d) not in mine for d in named):
+            raise Refused("sign_revision_unknown")
+        for d in named:
+            r = mine[bytes.fromhex(d)]
+            if r["by"] is not None or not r["final"] or r["unknown"]:
+                raise Refused("sign_revision_not_final")
+
+    def segment_offset(self, src, sg):
+        cues = [c for c in self.s.cues(src) if self.s.last(c)["event"]["digest"].hex() in sg["revisions"]]
+        if not cues:
+            return None
+        earliest = min(cues, key=lambda c: (self.s.revs[c[0]]["event"]["t"], c[0]))
+        placed = self.sources.get(src, (None, {}))[1].get(self.s.head(earliest))
+        return None if placed is None else sg["start"] - placed[0]
+
+    # §6.4
+    def review_rec(self, at):
+        _, v, _ = self.records[at]
+        if (v["verdict"] == "approved") != (v["notes"] is None):
+            raise Refused("record_malformed")
+        if not any(k == "wai-signing" and rid.hex() == v["signing"] for k, _, rid in self.records):
+            raise Refused("review_subject_unknown")
+
+    def find(self, kind, rid):
+        return next((v for k, v, i in self.records if k == kind and i.hex() == rid), None)
+
+    # §7.2
+    def claim_rec(self, at):
+        _, v, _ = self.records[at]
+        self.room_ok(v)
+        frm, to, pt0, tracks = v["from"], v["to"], v["pt0"], v["tracks"]
+        ok = frm < to and len(tracks) > 0
+        principals, recs = [], []
+        for t in tracks:
+            ok = ok and TT.lang_ok(t["lang"])
+            if t["service"] == "captions":
+                ok = ok and t["principal"] not in principals
+                principals.append(t["principal"])
+            else:
+                ok = ok and t["record"] not in recs
+                recs.append(t["record"])
+        if not ok:
+            raise Refused("claim_malformed")
+
+        def session(p):
+            return [c for c in self.s.cues(p) if frm <= self.s.revs[c[0]]["event"]["t"] < to]
+
+        m_from, m_to = pt0 + frm // 1000, pt0 + to // 1000
+        for t in tracks:
+            if t["service"] == "captions":
+                p = bytes.fromhex(t["principal"])
+                cues = session(p)
+                if not cues:
+                    raise Refused("track_missing")
+                if not self.s.resolved(p):
+                    raise Refused("track_incomplete")
+                if any(self.s.revs[r]["lang"] != t["lang"] for c in cues for r in c):
+                    raise Refused("track_mismatch")
+                if t["latency_mean_max"] is not None or t["latency_max"] is not None:
+                    lat = [x[0] for x in self.latencies(p, cues)]
+                    if len(lat) != len(cues):
+                        raise Refused("sync_unmeasured")
+                    if (t["latency_mean_max"] is not None and floor_div(sum(lat), len(lat)) > t["latency_mean_max"]) or \
+                            (t["latency_max"] is not None and any(x > t["latency_max"] for x in lat)):
+                        raise Refused("out_of_sync")
+            elif t["service"] == "audio-description":
+                d = self.find("wai-description", t["record"])
+                if d is None:
+                    raise Refused("track_missing")
+                if d["lang"] != t["lang"] or any(e["begin"] < m_from or e["end"] > m_to for e in d["events"]):
+                    raise Refused("track_mismatch")
+                if d["voicing"]["form"] == "track" and any(e["voice"] is None for e in d["events"]):
+                    raise Refused("track_incomplete")
+            else:
+                g = self.find("wai-signing", t["record"])
+                if g is None:
+                    raise Refused("track_missing")
+                if g["lang"] != t["lang"] or g["source"] not in principals:
+                    raise Refused("track_mismatch")
+                src = bytes.fromhex(g["source"])
+                named = {d for sg in g["segments"] for d in sg["revisions"]}
+                if any(self.s.last(c)["event"]["digest"].hex() not in named for c in session(src)):
+                    raise Refused("track_incomplete")
+                if t["review"] is not None:
+                    r = self.find("wai-signing-review", t["review"])
+                    if r is None:
+                        raise Refused("review_missing")
+                    if r["signing"] != t["record"]:
+                        raise Refused("review_mismatch")
+                    if r["verdict"] == "rejected":
+                        raise Refused("review_rejected")
+                if t["offset_max"] is not None:
+                    offs = [self.segment_offset(src, sg) for sg in g["segments"]]
+                    if any(o is None for o in offs):
+                        raise Refused("sync_unmeasured")
+                    if any(abs(o) > t["offset_max"] for o in offs):
+                        raise Refused("out_of_sync")
+
+    def overlap(self, v, rid):
+        dialogue = []
+        for t in v["tracks"]:
+            if t["service"] == "captions":
+                dialogue += self.s.intervals(bytes.fromhex(t["principal"]), v["pt0"])
+        union = []
+        for a, b in sorted(dialogue):
+            if union and a <= union[-1][1]:
+                union[-1][1] = max(union[-1][1], b)
+            else:
+                union.append([a, b])
+        out = []
+        for i, t in enumerate(v["tracks"]):
+            if t["service"] != "audio-description":
+                continue
+            d = self.find("wai-description", t["record"])
+            ms = n = 0
+            for e in d["events"]:
+                if e["voice"] is not None:
+                    a, b = e["voice"]["begin"], e["voice"]["end"]
+                else:
+                    a, b = e["begin"] + e["duck"]["ramp"], e["end"] - e["duck"]["ramp"]
+                o = sum(max(0, min(b, y) - max(a, x)) for x, y in union)
+                ms += o
+                n += 1 if o > 0 else 0
+            out.append({"track": i, "ms": ms, "events": n})
+        return {"record": rid.hex(), "overlap": out}
+
+
+# ---------------------------------------------------------------- §5 audio description
+
+ID = re.compile(r"[A-Za-z_][A-Za-z0-9_.\-]{0,63}")
+
+
+def description_rules(v):
+    """§5.2, in order."""
+    m = "description_malformed"
+    if not TT.lang_ok(v["lang"]):
+        raise Refused(m)
+    sc, vo = v["script"], v["voicing"]
+    sink = vo["form"] == "sink"
+    if (sc["origin"] != "human") != (sc["model"] is not None) or (vo["origin"] != "human") != (vo["model"] is not None) \
+            or sink == (vo["track"] is not None) or (sink and vo["origin"] == "human"):
+        raise Refused(m)
+    evs = v["events"]
+    if not evs:
+        raise Refused(m)
+    ids = set()
+    for i, e in enumerate(evs):
+        if ID.fullmatch(e["id"]) is None or e["id"] in ids or not e["begin"] < e["end"] <= MAX_MS or \
+                (i > 0 and e["begin"] < evs[i - 1]["end"]):
+            raise Refused(m)
+        ids.add(e["id"])
+    if not all(TT.text_ok(e["text"]) for e in evs):
+        raise Refused("text_not_in_subset")
+    for e in evs:
+        g, r = e["duck"]["gain"], e["duck"]["ramp"]
+        if not (g <= 1000 and (g == 1000) == (r == 0) and 2 * r <= e["end"] - e["begin"]):
+            raise Refused(m)
+        vc = e["voice"]
+        if vc is not None and (sink or not e["begin"] <= vc["begin"] < vc["end"] <= e["end"]):
+            raise Refused(m)
+    for e in evs:
+        vc = e["voice"]
+        if vc is None:
+            continue
+        a, z = e["begin"] + e["duck"]["ramp"], e["end"] - e["duck"]["ramp"]
+        if not (a - 35 <= vc["begin"] <= a + 45 and vc["end"] <= z + 45):
+            raise Refused("description_out_of_sync")
+
+
+def description_figures(v, rid):
+    offs = [None if e["voice"] is None else str(e["voice"]["begin"] - (e["begin"] + e["duck"]["ramp"])) for e in v["events"]]
+    return {"record": rid.hex(), "events": len(v["events"]), "voiced": sum(1 for e in v["events"] if e["voice"] is not None),
+            "offsets": offs}
+
+
+PARAM = re.compile(r"[!#-%'-;=?-~]{1,2048}")
+
+
+def hhmmss(ms):
+    return "%02d:%02d:%02d.%03d" % (ms // 3600000, ms // 60000 % 60, ms // 1000 % 60, ms % 1000)
+
+
+def gain(g):
+    if g == 0:
+        return "0"
+    if g == 1000:
+        return "1"
+    return "0." + ("%03d" % g).rstrip("0")
+
+
+def esc(s):
+    return s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;").replace("\n", "<br/>")
+
+
+def dapt(v, uri, typ):
+    """§5.5's document."""
+    track = v["voicing"]["form"] == "track"
+    if track and not (PARAM.fullmatch(uri or "") and PARAM.fullmatch(typ or "")):
+        raise Refused("parameter_malformed")
+    reps = []
+    for e in v["events"]:
+        if e["represents"] not in reps:
+            reps.append(e["represents"])
+
+    def label(o, name):
+        s = ' wai:%s="%s"' % (name, o["origin"])
+        if o["model"] is not None:
+            s += ' wai:%s-model="%s"' % (name, o["model"])
+        return s
+
+    out = ['<?xml version="1.0" encoding="UTF-8"?>',
+           '<tt xmlns="%s" xmlns:ttp="%s" xmlns:tta="%s" xmlns:daptm="%s" xmlns:wai="%s" xml:lang="%s" ttp:contentProfiles="%s" '
+           'daptm:langSrc="zxx" daptm:scriptRepresents="%s" daptm:scriptType="%s"%s%s>'
+           % (NS_TT, NS_TTP, NS_TTA, NS_DAPTM, NS_WAI, v["lang"], DAPT_CONTENT, " ".join(reps),
+              "asRecorded" if track else "preRecording", label(v["script"], "script"), label(v["voicing"], "voice")),
+           "<body>"]
+    for e in v["events"]:
+        b, en, g, r = e["begin"], e["end"], e["duck"]["gain"], e["duck"]["ramp"]
+        out.append('<div xml:id="%s" begin="%s" end="%s" daptm:represents="%s">' % (e["id"], hhmmss(b), hhmmss(en), e["represents"]))
+        if g < 1000:
+            out.append('<animate begin="00:00:00.000" end="%s" tta:gain="1;%s" fill="freeze"/>' % (hhmmss(r), gain(g)))
+            out.append('<animate begin="%s" end="%s" tta:gain="%s;1"/>' % (hhmmss(en - b - r), hhmmss(en - b), gain(g)))
+        text = esc(e["text"])
+        if track and e["voice"] is not None:
+            vb, ve = e["voice"]["begin"], e["voice"]["end"]
+            content = '<span begin="%s" end="%s"><audio src="%s" type="%s" clipBegin="%s" clipEnd="%s"/>%s</span>' % (
+                hhmmss(vb - b), hhmmss(ve - b), uri, typ, hhmmss(vb), hhmmss(ve), text)
+        elif track:
+            content = text
+        else:
+            content = '<span tta:speak="normal">%s</span>' % text
+        out.append("<p>%s</p>" % content)
+        out.append("</div>")
+    out += ["</body>", "</tt>"]
+    return "\n".join(out) + "\n"
+
+
+def dapt_structure(doc, v):
+    """Parse the document and check what DAPT §4 and §5 ask of it."""
+    root = ET.fromstring(doc.encode("utf-8"))
+    q = lambda ns, n: "{%s}%s" % (ns, n)  # noqa: E731
+    fails = []
+    if root.tag != q(NS_TT, "tt"):
+        fails.append("the root is not tt")
+    if root.get(q(NS_TTP, "contentProfiles")) != DAPT_CONTENT or root.get(q(NS_TTP, "profile")) is not None:
+        fails.append("the profile is not signalled as DAPT §5.6 asks")
+    if root.get(q(NS_DAPTM, "scriptType")) not in ("preRecording", "asRecorded") or not root.get(q(NS_DAPTM, "scriptRepresents")):
+        fails.append("no script type or script represents")
+    if root.get(q(NS_XML, "lang")) != v["lang"]:
+        fails.append("xml:lang is not the record's")
+    reps = root.get(q(NS_DAPTM, "scriptRepresents"), "").split(" ")
+    divs = root.findall(q(NS_TT, "body") + "/" + q(NS_TT, "div"))
+    if len(divs) != len(v["events"]):
+        fails.append("not one Script Event per description")
+    for div, e in zip(divs, v["events"]):
+        if div.get(q(NS_XML, "id")) != e["id"] or div.get(q(NS_DAPTM, "represents")) not in reps:
+            fails.append("Script Event %s: its id or represents" % e["id"])
+        anim = div.findall(q(NS_TT, "animate"))
+        if len(anim) != (2 if e["duck"]["gain"] < 1000 else 0):
+            fails.append("Script Event %s: its mixing instructions" % e["id"])
+        ps = div.findall(q(NS_TT, "p"))
+        if len(ps) != 1:
+            fails.append("Script Event %s: not one Text" % e["id"])
+            continue
+        if "".join(ps[0].itertext()) != e["text"].replace("\n", ""):
+            fails.append("Script Event %s: its text" % e["id"])
+        audio = ps[0].findall(".//" + q(NS_TT, "audio"))
+        spoken = [s for s in ps[0].iter(q(NS_TT, "span")) if s.get(q(NS_TTA, "speak")) is not None]
+        want_audio = v["voicing"]["form"] == "track" and e["voice"] is not None
+        if (len(audio) == 1) != want_audio or (len(spoken) == 1) != (v["voicing"]["form"] == "sink"):
+            fails.append("Script Event %s: its audio" % e["id"])
+    return fails
+
+
+# ---------------------------------------------------------------- §8 verification
+
+KIND_ORDER = ["wai-caption-sources", "wai-caption-reference", "wai-description", "wai-signing", "wai-signing-review",
+              "wai-caption-quality", "wai-access-completeness"]
+
+
+def verify(room, events, texts):
+    out, cap = TT.verify_events(room, events)
+    if out["outcome"] == "refuse":
+        return {"outcome": "refuse", "at": "events", "index": out["index"], "reason": out["reason"]}
+    stream = Stream(room, cap)
+    records = []
+    for i, t in enumerate(texts):
+        try:
+            records.append(read_record(t))
+        except Refused as e:
+            return {"outcome": "refuse", "at": "record", "index": i, "reason": e.reason}
+    run = Run(stream, records)
+    checks = {"wai-caption-sources": run.sources_rec, "wai-caption-reference": run.reference_rec,
+              "wai-description": lambda i: description_rules(records[i][1]), "wai-signing": run.signing_rec,
+              "wai-signing-review": run.review_rec, "wai-caption-quality": run.quality_rec,
+              "wai-access-completeness": run.claim_rec}
+    for kind in KIND_ORDER:
+        for i, (k, _, _) in enumerate(records):
+            if k != kind:
+                continue
+            try:
+                checks[kind](i)
+            except Refused as e:
+                return {"outcome": "refuse", "at": "record", "index": i, "reason": e.reason}
+    signings = []
+    for k, v, rid in records:
+        if k != "wai-signing":
+            continue
+        src = bytes.fromhex(v["source"])
+        offs = [run.segment_offset(src, sg) for sg in v["segments"]]
+        floor = None
+        if v["video"] is not None:
+            w, h = v["video"]["width"], v["video"]["height"]
+            floor = "meets" if min(w, h) >= 240 and max(w, h) >= 320 and v["video"]["rate_num"] >= 20 * v["video"]["rate_den"] else "below"
+        signings.append({"record": rid.hex(), "segments": len(v["segments"]), "revisions": sum(len(s["revisions"]) for s in v["segments"]),
+                         "offsets": [None if o is None else str(o) for o in offs], "video_floor": floor})
+    figures = {
+        "captions": [run.figure(p) for p in stream.principals() if stream.whole(p)],
+        "descriptions": [description_figures(v, rid) for k, v, rid in records if k == "wai-description"],
+        "signings": signings,
+        "claims": [run.overlap(v, rid) for k, v, rid in records if k == "wai-access-completeness"],
+    }
+    return {"outcome": "accept", "figures": figures}
+
+
+# ---------------------------------------------------------------- the corpus
+
+def check(doc, files, quiet=False, only=None):
+    """Every vector and document, or only those `only` names (a mutation's), with the corpus's
+    coverage of §10 checked when all are."""
+    fails, seen = [], set()
+    room = bytes.fromhex(doc["room"])
+    streams = {n: [bytes.fromhex(h) for h in evs] for n, evs in doc["streams"].items()}
+    texts_of = {}
+    for v in doc["vectors"]:
+        name = v["name"]
+        texts_of[name] = v["records"]
+        if only is not None and name not in only:
+            continue
+        before = len(fails)
+        try:
+            got = verify(room, streams[v["stream"]], v["records"])
+        except Exception as e:  # a verifier that cannot read a case fails it
+            fails.append("%s: does not verify: %s: %s" % (name, type(e).__name__, e))
+            continue
+        for k in ("outcome", "at", "index", "reason", "figures"):
+            if got.get(k) != v.get(k):
+                fails.append("%s: %s is %s, the corpus states %s" % (name, k, json.dumps(got.get(k))[:300], json.dumps(v.get(k))[:300]))
+        if got.get("reason"):
+            seen.add(got["reason"])
+        if not quiet:
+            print("%s %s: %s" % ("PASS" if len(fails) == before else "FAIL", name, got["outcome"] + (" " + got["reason"] if got.get("reason") else "")))
+    for d in doc["documents"]:
+        if only is not None and d.get("file", d["vector"]) not in only:
+            continue
+        before = len(fails)
+        try:
+            _, v, _ = read_record(texts_of[d["vector"]][d["record"]])
+            doc_text, why = dapt(v, d["uri"], d["type"]), None
+        except Refused as e:
+            doc_text, why = None, e.reason
+        if why is not None:
+            seen.add(why)
+        if d.get("reason") != why:
+            fails.append("document of %s: refused %s, the corpus states %s" % (d["vector"], why, d.get("reason")))
+        elif doc_text is not None:
+            if files.get(d["file"]) != doc_text:
+                fails.append("document of %s: %s differs from the text's" % (d["vector"], d["file"]))
+            else:
+                fails += ["document %s: %s" % (d["file"], f) for f in dapt_structure(doc_text, v)]
+        if not quiet:
+            print("%s document of %s: %s" % ("PASS" if len(fails) == before else "FAIL", d["vector"], d.get("file") or why))
+    missing = [r for r in reasons_of_extension() if r not in seen]
+    if missing and only is None:
+        fails.append("nothing is refused %s" % ", ".join(missing))
+    return fails
+
+
+def mutations(doc, files):
+    """Copies of the corpus, each with one defect a conforming verifier must catch."""
+    out = []
+
+    def mutate(label, f, only):
+        d, fs = copy.deepcopy(doc), dict(files)
+        f(d, fs)
+        out.append((label, d, fs, only))
+
+    def flip_sig(text):
+        v = json.loads(text)
+        v["sig"] = v["sig"][:-1] + ("1" if v["sig"][-1] == "0" else "0")
+        return json.dumps(v, sort_keys=True, separators=(",", ":"), ensure_ascii=False)
+
+    for i, v in enumerate(doc["vectors"]):
+        if v["outcome"] == "accept":
+            def stated(d, fs, i=i):
+                d["vectors"][i]["figures"]["captions"][0]["latency"]["n"] += 1
+            mutate("%s: a stated figure changed" % v["name"], stated, {v["name"]})
+            for k in range(len(v["records"])):
+                def sig(d, fs, i=i, k=k):
+                    d["vectors"][i]["records"][k] = flip_sig(d["vectors"][i]["records"][k])
+                mutate("%s: record %d's signature flipped" % (v["name"], k), sig, {v["name"]})
+            for k in range(len(doc["streams"][v["stream"]])):
+                def ev(d, fs, i=i, k=k):
+                    name = "mutated"
+                    evs = list(d["streams"][d["vectors"][i]["stream"]])
+                    b = bytearray(bytes.fromhex(evs[k]))
+                    b[-1] ^= 0x01
+                    evs[k] = b.hex()
+                    d["streams"][name] = evs
+                    d["vectors"][i]["stream"] = name
+                mutate("%s: event %d altered" % (v["name"], k), ev, {v["name"]})
+        else:
+            def place(d, fs, i=i):
+                d["vectors"][i]["index"] += 1
+            mutate("%s: the place of its refusal moved" % v["name"], place, {v["name"]})
+
+            def reason(d, fs, i=i):
+                d["vectors"][i]["reason"] = "record_malformed" if d["vectors"][i]["reason"] != "record_malformed" else "bad_key"
+            mutate("%s: its reason changed" % v["name"], reason, {v["name"]})
+    for d0 in doc["documents"]:
+        if "file" in d0:
+            def doc_byte(d, fs, f=d0["file"]):
+                fs[f] = fs[f].replace("<p>", "<p> ", 1)
+            mutate("%s: a byte added" % d0["file"], doc_byte, {d0["file"]})
+    return out
+
+
+def main(corpus_dir):
+    files = {}
+    for n in sorted(os.listdir(corpus_dir)):
+        if n != "README.md":
+            with open(os.path.join(corpus_dir, n), encoding="utf-8") as f:
+                files[n] = f.read()
+    doc = json.loads(files["vectors.json"])
+    fails = check(doc, files)
+    for f in fails:
+        print("FAIL " + f)
+    caught = 0
+    muts = mutations(doc, files)
+    for label, d, fs, only in muts:
+        if check(d, fs, quiet=True, only=only):
+            caught += 1
+        else:
+            fails.append("a mutated copy verifies: " + label)
+            print("FAIL a mutated copy verifies: " + label)
+    print("%s every mutated copy of the corpus fails (%d of %d)" % ("PASS" if caught == len(muts) else "FAIL", caught, len(muts)))
+    print("%s %s" % ("PASS" if not fails else "FAIL", "the corpus verifies" if not fails else "%d failures" % len(fails)))
+    return 0 if not fails else 1
+
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        sys.exit("usage: access_services_verify.py <live-conformance/access>")
+    sys.exit(main(sys.argv[1]))
diff --git a/wai/registry/capabilities.json b/wai/registry/capabilities.json
index 3cb107ada..152f9f284 100644
--- a/wai/registry/capabilities.json
+++ b/wai/registry/capabilities.json
@@ -1,6 +1,20 @@
 {
   "schema": "https://git.transaction.science/Transaction-Science/open-standards/src/branch/main/wai/registry/capabilities.schema.json",
   "capabilities": [
+    {
+      "capability": "wai.access.services",
+      "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": "2026-10-21"
+    },
     {
       "capability": "wai.ai.usage",
       "kind": "record",
@@ -2333,6 +2347,13 @@
       "section": "§10.5",
       "status": "defined"
     },
+    {
+      "name": "tag:transaction.science,2026:wai/access",
+      "kind": "scheme",
+      "document": "extensions/access-services.md",
+      "section": "§5.5",
+      "status": "defined"
+    },
     {
       "name": "tag:transaction.science,2026:wai/class",
       "kind": "scheme",
@@ -2396,6 +2417,13 @@
       "section": "§3",
       "status": "defined"
     },
+    {
+      "name": "wai-access-completeness",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§7.1",
+      "status": "defined"
+    },
     {
       "name": "wai-authorship-map",
       "kind": "document-kind",
@@ -2410,6 +2438,27 @@
       "section": "§10.2",
       "status": "defined"
     },
+    {
+      "name": "wai-caption-quality",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§4.7",
+      "status": "defined"
+    },
+    {
+      "name": "wai-caption-reference",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§4.3",
+      "status": "defined"
+    },
+    {
+      "name": "wai-caption-sources",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§4.2",
+      "status": "defined"
+    },
     {
       "name": "wai-contribution",
       "kind": "document-kind",
@@ -2424,6 +2473,13 @@
       "section": "§5.1",
       "status": "defined"
     },
+    {
+      "name": "wai-description",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§5.1",
+      "status": "defined"
+    },
     {
       "name": "wai-detection",
       "kind": "document-kind",
@@ -2515,6 +2571,20 @@
       "section": "§3.1",
       "status": "defined"
     },
+    {
+      "name": "wai-signing",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§6.1",
+      "status": "defined"
+    },
+    {
+      "name": "wai-signing-review",
+      "kind": "document-kind",
+      "document": "extensions/access-services.md",
+      "section": "§6.4",
+      "status": "defined"
+    },
     {
       "name": "wai-step",
       "kind": "document-kind",
diff --git a/wai/vocab/v2.ttl b/wai/vocab/v2.ttl
index 599b50d69..7f3ca32f5 100644
--- a/wai/vocab/v2.ttl
+++ b/wai/vocab/v2.ttl
@@ -103,6 +103,13 @@ wai:pinTier a owl:DatatypeProperty ; rdfs:domain wai:ParameterSetPin ; rdfs:rang
 
 # ─── Registered strings ──────────────────────────────────────────────
 
+wai:wai.access.services a wai:Capability ;
+    rdfs:label "wai.access.services" ;
+    wai:kind wai:kind-record ;
+    wai:status wai:status-registered ;
+    wai:specSection "§5 Interactive, temporal & computed content" ;
+    wai:registeredOn "2026-10-21"^^xsd:date .
+
 wai:wai.ai.usage a wai:Capability ;
     rdfs:label "wai.ai.usage" ;
     wai:kind wai:kind-record ;
diff --git a/wai/wai-rs/Cargo.toml b/wai/wai-rs/Cargo.toml
index b37b1709b..0c3f41c3c 100644
--- a/wai/wai-rs/Cargo.toml
+++ b/wai/wai-rs/Cargo.toml
@@ -331,6 +331,14 @@ settlement = ["live_metering", "jwp_hash"]
 # machine-generation disclosure carried through each. No new dependency: the XML is
 # written by hand.
 timed_text = ["live_events"]
+# Access services (extensions/access-services): `wai.access.services` — a caption track's
+# latency, stability and accuracy computed from its signed revisions (sources placed on the
+# room clock through a take's opening commitment, a reference transcript, word alignment in
+# integer arithmetic) and the check of a stated figure; audio description (script, ducking,
+# voicing, synchronisation to DAPT §5.5's bounds) and its DAPT document, written by hand;
+# sign language as a pose or video track bound to final caption revisions, with a review; and
+# the completeness claim of a room session. SHA-256, Ed25519 and JCS only; no new dependency.
+access_services = ["timed_text", "capture_take"]
 # Object-based spatial audio (extensions/spatial-audio): the deterministic
 # Fx mixdown engine. Reuses the world `Fx` floor + blake3; no codec/ML deps
 # (sources arrive as decoded mono PCM — decoding the wai.audio.* assets is
@@ -831,6 +839,11 @@ name = "wai_timed_text_vectors"
 path = "src/bin/wai_timed_text_vectors.rs"
 required-features = ["timed_text"]
 
+[[bin]]
+name = "wai_access_services_vectors"
+path = "src/bin/wai_access_services_vectors.rs"
+required-features = ["access_services"]
+
 [[bin]]
 name = "wai_world_meter"
 path = "src/bin/wai_world_meter.rs"
@@ -1561,6 +1574,11 @@ name = "timed_text"
 path = "tests/timed_text.rs"
 required-features = ["timed_text"]
 
+[[test]]
+name = "access_services"
+path = "tests/access_services.rs"
+required-features = ["access_services"]
+
 [[test]]
 name = "world_replay"
 path = "tests/world_replay.rs"
diff --git a/wai/wai-rs/src/access_services.rs b/wai/wai-rs/src/access_services.rs
new file mode 100644
index 000000000..9046eaa11
--- /dev/null
+++ b/wai/wai-rs/src/access_services.rs
@@ -0,0 +1,1483 @@
+//! Access services — `wai.access.services` ([extensions/access-services.md]).
+//!
+//! Captions are timed-text's, unchanged; this module adds figures about them that any
+//! verifier recomputes from the signed revisions, and the two other access services, audio
+//! description and sign language, with a claim that a room session carried each complete
+//! and in sync.
+//!
+//! What this module implements, by section of the extension:
+//!
+//! - §2: the records, read as JSON with a claim's limits, their shape, their strict
+//!   Ed25519 signature over the JCS form, and their record ids;
+//! - §3: words, and the alignment of two lists of words with its fixed walk back;
+//! - §4: a caption track's sources (placed on the room clock through a take's opening
+//!   commitment), its reference transcript, and its latency, stability and accuracy, and the
+//!   check of a stated figure;
+//! - §5: the description record, its rules and synchronisation, its overlap with dialogue,
+//!   and its DAPT document;
+//! - §6: the signing record, its binding to final caption revisions, its figures, and a
+//!   review;
+//! - §7: the completeness claim;
+//! - §8: verification of a room's events and records.
+//!
+//! The corpus `live-conformance/access/` is written by [`corpus::generate`] and checked by
+//! [`corpus::verify`], and by `live-conformance/access_services_verify.py`, which shares no
+//! code with this module.
+//!
+//! [extensions/access-services.md]: ../../extensions/access-services.md
+
+use std::collections::{BTreeMap, BTreeSet};
+
+use ed25519_dalek::{Signer, SigningKey};
+use serde_json::{json, Map, Value};
+use sha2::{Digest, Sha256};
+
+use crate::capture_take::{take_id, Commit};
+use crate::jcs::{jcs, MAX_INTEGER};
+use crate::live_events::{self as le, Command, Payload};
+use crate::timed_text::{self as tt, CaptionVerifier, Revision};
+
+pub mod corpus;
+
+/// The prefix of every signature's message (§2).
+pub const SIGN_DOMAIN: &[u8] = b"wai:access\x01";
+/// The namespace of the DAPT document's foreign attributes (§5.5).
+pub const XML_NS: &str = "tag:transaction.science,2026:wai/access";
+/// DAPT's content profile designator (DAPT §5.6.1).
+pub const DAPT_CONTENT: &str = "http://www.w3.org/ns/ttml/profile/dapt1.0/content";
+/// The latest a media time may be, in milliseconds (timed-text §3.1).
+pub const MAX_MS: u64 = tt::MAX_MS;
+/// DAPT §5.5: audio may change this many milliseconds before the time a document states.
+pub const EARLY_MS: u64 = 35;
+/// DAPT §5.5: and this many after it.
+pub const LATE_MS: u64 = 45;
+
+/// The `kind` of each record (§4.2 to §7.1).
+pub mod kinds {
+    pub const SOURCES: &str = "wai-caption-sources";
+    pub const REFERENCE: &str = "wai-caption-reference";
+    pub const QUALITY: &str = "wai-caption-quality";
+    pub const DESCRIPTION: &str = "wai-description";
+    pub const SIGNING: &str = "wai-signing";
+    pub const REVIEW: &str = "wai-signing-review";
+    pub const CLAIM: &str = "wai-access-completeness";
+}
+
+/// A refusal of §10.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub enum Reason {
+    RecordMalformed,
+    BadKey,
+    BadSignature,
+    WrongRoom,
+    RecordConflict,
+    SourceUnknown,
+    SourceTakeUnknown,
+    TextNotInSubset,
+    ReferenceUnknown,
+    ReferenceIncomplete,
+    StreamIncomplete,
+    FigureInputsMismatch,
+    FigureMismatch,
+    DescriptionMalformed,
+    DescriptionOutOfSync,
+    ParameterMalformed,
+    SigningMalformed,
+    SignRevisionUnknown,
+    SignRevisionNotFinal,
+    ReviewSubjectUnknown,
+    ClaimMalformed,
+    TrackMissing,
+    TrackIncomplete,
+    TrackMismatch,
+    SyncUnmeasured,
+    OutOfSync,
+    ReviewMissing,
+    ReviewMismatch,
+    ReviewRejected,
+}
+
+impl Reason {
+    /// Every reason, in the order §10 lists them.
+    pub const ALL: [Reason; 29] = [
+        Reason::RecordMalformed,
+        Reason::BadKey,
+        Reason::BadSignature,
+        Reason::WrongRoom,
+        Reason::RecordConflict,
+        Reason::SourceUnknown,
+        Reason::SourceTakeUnknown,
+        Reason::TextNotInSubset,
+        Reason::ReferenceUnknown,
+        Reason::ReferenceIncomplete,
+        Reason::StreamIncomplete,
+        Reason::FigureInputsMismatch,
+        Reason::FigureMismatch,
+        Reason::DescriptionMalformed,
+        Reason::DescriptionOutOfSync,
+        Reason::ParameterMalformed,
+        Reason::SigningMalformed,
+        Reason::SignRevisionUnknown,
+        Reason::SignRevisionNotFinal,
+        Reason::ReviewSubjectUnknown,
+        Reason::ClaimMalformed,
+        Reason::TrackMissing,
+        Reason::TrackIncomplete,
+        Reason::TrackMismatch,
+        Reason::SyncUnmeasured,
+        Reason::OutOfSync,
+        Reason::ReviewMissing,
+        Reason::ReviewMismatch,
+        Reason::ReviewRejected,
+    ];
+
+    /// Its code, as §10 writes it.
+    pub fn code(self) -> &'static str {
+        match self {
+            Reason::RecordMalformed => "record_malformed",
+            Reason::BadKey => "bad_key",
+            Reason::BadSignature => "bad_signature",
+            Reason::WrongRoom => "wrong_room",
+            Reason::RecordConflict => "record_conflict",
+            Reason::SourceUnknown => "source_unknown",
+            Reason::SourceTakeUnknown => "source_take_unknown",
+            Reason::TextNotInSubset => "text_not_in_subset",
+            Reason::ReferenceUnknown => "reference_unknown",
+            Reason::ReferenceIncomplete => "reference_incomplete",
+            Reason::StreamIncomplete => "stream_incomplete",
+            Reason::FigureInputsMismatch => "figure_inputs_mismatch",
+            Reason::FigureMismatch => "figure_mismatch",
+            Reason::DescriptionMalformed => "description_malformed",
+            Reason::DescriptionOutOfSync => "description_out_of_sync",
+            Reason::ParameterMalformed => "parameter_malformed",
+            Reason::SigningMalformed => "signing_malformed",
+            Reason::SignRevisionUnknown => "sign_revision_unknown",
+            Reason::SignRevisionNotFinal => "sign_revision_not_final",
+            Reason::ReviewSubjectUnknown => "review_subject_unknown",
+            Reason::ClaimMalformed => "claim_malformed",
+            Reason::TrackMissing => "track_missing",
+            Reason::TrackIncomplete => "track_incomplete",
+            Reason::TrackMismatch => "track_mismatch",
+            Reason::SyncUnmeasured => "sync_unmeasured",
+            Reason::OutOfSync => "out_of_sync",
+            Reason::ReviewMissing => "review_missing",
+            Reason::ReviewMismatch => "review_mismatch",
+            Reason::ReviewRejected => "review_rejected",
+        }
+    }
+
+    pub fn from_code(code: &str) -> Option<Reason> {
+        Reason::ALL.iter().copied().find(|r| r.code() == code)
+    }
+}
+
+impl std::fmt::Display for Reason {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(self.code())
+    }
+}
+
+impl std::error::Error for Reason {}
+
+fn sha(parts: &[&[u8]]) -> [u8; 32] {
+    let mut h = Sha256::new();
+    for p in parts {
+        h.update(p);
+    }
+    h.finalize().into()
+}
+
+pub(crate) fn hex(b: &[u8]) -> String {
+    b.iter().map(|x| format!("{x:02x}")).collect()
+}
+
+fn unhex<const N: usize>(s: &str) -> Option<[u8; N]> {
+    if s.len() != 2 * N || !s.bytes().all(|c| c.is_ascii_digit() || (b'a'..=b'f').contains(&c)) {
+        return None;
+    }
+    let mut out = [0u8; N];
+    for (i, o) in out.iter_mut().enumerate() {
+        *o = u8::from_str_radix(&s[2 * i..2 * i + 2], 16).ok()?;
+    }
+    Some(out)
+}
+
+// ---------------------------------------------------------------------------------------
+// §2 Records
+// ---------------------------------------------------------------------------------------
+
+/// A member's type in a record's table (§2).
+#[derive(Debug)]
+enum Ty {
+    Hex32,
+    Hex64,
+    Int,
+    Sint,
+    Str,
+    OneOf(&'static [&'static str]),
+    Obj(&'static [(&'static str, Ty)]),
+    Arr(&'static Ty),
+    OrNull(&'static Ty),
+}
+
+const ORIGINS: &[&str] = &["human", "machine", "machine-reviewed"];
+const REPRESENTS: &[&str] =
+    &["visual", "visual.nonText", "visual.text", "visual.text.title", "visual.text.credit", "visual.text.location", "visual.dialogue"];
+
+const SOURCE_ENTRY: &[(&str, Ty)] =
+    &[("cue", Ty::Hex32), ("basis", Ty::OneOf(&["take", "room"])), ("take", Ty::OrNull(&Ty::Hex32)), ("start", Ty::Int), ("end", Ty::Int)];
+const SOURCES: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::SOURCES])),
+    ("room", Ty::Hex32),
+    ("principal", Ty::Hex32),
+    ("sources", Ty::Arr(&Ty::Obj(SOURCE_ENTRY))),
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+const REFERENCE_ENTRY: &[(&str, Ty)] = &[("cue", Ty::Hex32), ("text", Ty::Str)];
+const REFERENCE: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::REFERENCE])),
+    ("room", Ty::Hex32),
+    ("principal", Ty::Hex32),
+    ("entries", Ty::Arr(&Ty::Obj(REFERENCE_ENTRY))),
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+const LATENCY: &[(&str, Ty)] = &[
+    ("class", Ty::OneOf(&["none", "capture", "stated"])),
+    ("n", Ty::Int),
+    ("min", Ty::OrNull(&Ty::Sint)),
+    ("max", Ty::OrNull(&Ty::Sint)),
+    ("mean", Ty::OrNull(&Ty::Sint)),
+    ("p50", Ty::OrNull(&Ty::Sint)),
+    ("p95", Ty::OrNull(&Ty::Sint)),
+];
+const STABILITY: &[(&str, Ty)] = &[("revisions", Ty::Int), ("words_changed", Ty::Int), ("cues_corrected", Ty::Int)];
+const COUNTS: &[(&str, Ty)] =
+    &[("words", Ty::Int), ("errors", Ty::Int), ("substitutions", Ty::Int), ("deletions", Ty::Int), ("insertions", Ty::Int)];
+const ACCURACY: &[(&str, Ty)] = &[
+    ("class", Ty::OneOf(&["transcript", "reviewed", "self"])),
+    ("first", Ty::Obj(COUNTS)),
+    ("final", Ty::OrNull(&Ty::Obj(COUNTS))),
+];
+const QUALITY: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::QUALITY])),
+    ("room", Ty::Hex32),
+    ("principal", Ty::Hex32),
+    ("events", Ty::Hex32),
+    ("sources", Ty::OrNull(&Ty::Hex32)),
+    ("reference", Ty::OrNull(&Ty::Hex32)),
+    ("cues", Ty::Int),
+    ("latency", Ty::Obj(LATENCY)),
+    ("stability", Ty::Obj(STABILITY)),
+    ("accuracy", Ty::Obj(ACCURACY)),
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+const LABEL: &[(&str, Ty)] = &[("origin", Ty::OneOf(ORIGINS)), ("model", Ty::OrNull(&Ty::Hex32))];
+const VOICING: &[(&str, Ty)] = &[
+    ("form", Ty::OneOf(&["track", "sink"])),
+    ("origin", Ty::OneOf(ORIGINS)),
+    ("model", Ty::OrNull(&Ty::Hex32)),
+    ("track", Ty::OrNull(&Ty::Hex32)),
+];
+const DUCK: &[(&str, Ty)] = &[("gain", Ty::Int), ("ramp", Ty::Int)];
+const SPAN: &[(&str, Ty)] = &[("begin", Ty::Int), ("end", Ty::Int)];
+const DESCRIPTION_EVENT: &[(&str, Ty)] = &[
+    ("id", Ty::Str),
+    ("begin", Ty::Int),
+    ("end", Ty::Int),
+    ("represents", Ty::OneOf(REPRESENTS)),
+    ("text", Ty::Str),
+    ("duck", Ty::Obj(DUCK)),
+    ("voice", Ty::OrNull(&Ty::Obj(SPAN))),
+];
+const DESCRIPTION: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::DESCRIPTION])),
+    ("lang", Ty::Str),
+    ("script", Ty::Obj(LABEL)),
+    ("voicing", Ty::Obj(VOICING)),
+    ("events", Ty::Arr(&Ty::Obj(DESCRIPTION_EVENT))),
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+const VIDEO: &[(&str, Ty)] = &[("width", Ty::Int), ("height", Ty::Int), ("rate_num", Ty::Int), ("rate_den", Ty::Int)];
+const SEGMENT: &[(&str, Ty)] =
+    &[("object", Ty::Hex32), ("start", Ty::Int), ("end", Ty::Int), ("revisions", Ty::Arr(&Ty::Hex32))];
+const SIGNING: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::SIGNING])),
+    ("room", Ty::Hex32),
+    ("lang", Ty::Str),
+    ("source", Ty::Hex32),
+    ("form", Ty::OneOf(&["pose", "video"])),
+    ("track", Ty::Hex32),
+    ("origin", Ty::OneOf(ORIGINS)),
+    ("model", Ty::OrNull(&Ty::Hex32)),
+    ("video", Ty::OrNull(&Ty::Obj(VIDEO))),
+    ("segments", Ty::Arr(&Ty::Obj(SEGMENT))),
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+const REVIEW: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::REVIEW])),
+    ("signing", Ty::Hex32),
+    ("scope", Ty::OneOf(&["translation"])),
+    ("verdict", Ty::OneOf(&["approved", "approved-with-notes", "rejected"])),
+    ("notes", Ty::OrNull(&Ty::Hex32)),
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+const TRACK_CAPTIONS: &[(&str, Ty)] = &[
+    ("service", Ty::OneOf(&["captions"])),
+    ("principal", Ty::Hex32),
+    ("lang", Ty::Str),
+    ("latency_mean_max", Ty::OrNull(&Ty::Int)),
+    ("latency_max", Ty::OrNull(&Ty::Int)),
+];
+const TRACK_DESCRIPTION: &[(&str, Ty)] =
+    &[("service", Ty::OneOf(&["audio-description"])), ("record", Ty::Hex32), ("lang", Ty::Str)];
+const TRACK_SIGN: &[(&str, Ty)] = &[
+    ("service", Ty::OneOf(&["sign-language"])),
+    ("record", Ty::Hex32),
+    ("lang", Ty::Str),
+    ("review", Ty::OrNull(&Ty::Hex32)),
+    ("offset_max", Ty::OrNull(&Ty::Int)),
+];
+const CLAIM: &[(&str, Ty)] = &[
+    ("kind", Ty::OneOf(&[kinds::CLAIM])),
+    ("room", Ty::Hex32),
+    ("from", Ty::Int),
+    ("to", Ty::Int),
+    ("pt0", Ty::Int),
+    ("tracks", Ty::Arr(&Ty::Obj(&[]))), // each track is checked by its service's table
+    ("signer_pubkey", Ty::Hex32),
+    ("sig", Ty::Hex64),
+];
+
+fn is_sint(s: &str) -> bool {
+    let digits = s.strip_prefix('-').unwrap_or(s);
+    if digits.is_empty() || !digits.bytes().all(|c| c.is_ascii_digit()) {
+        return false;
+    }
+    if s == "0" {
+        return true;
+    }
+    if digits.starts_with('0') {
+        return false;
+    }
+    s.parse::<i64>().is_ok()
+}
+
+/// Whether `v` is of type `t` (§2).
+fn shape(v: &Value, t: &Ty) -> bool {
+    match t {
+        Ty::Hex32 => v.as_str().is_some_and(|s| unhex::<32>(s).is_some()),
+        Ty::Hex64 => v.as_str().is_some_and(|s| unhex::<64>(s).is_some()),
+        Ty::Int => v.as_u64().is_some_and(|n| n <= MAX_INTEGER),
+        Ty::Sint => v.as_str().is_some_and(is_sint),
+        Ty::Str => v.is_string(),
+        Ty::OneOf(set) => v.as_str().is_some_and(|s| set.contains(&s)),
+        Ty::Obj(table) => obj_shape(v, table),
+        Ty::Arr(item) => v.as_array().is_some_and(|a| a.iter().all(|x| shape(x, item))),
+        Ty::OrNull(inner) => v.is_null() || shape(v, inner),
+    }
+}
+
+fn obj_shape(v: &Value, table: &[(&str, Ty)]) -> bool {
+    let Some(m) = v.as_object() else { return false };
+    m.len() == table.len() && table.iter().all(|(k, t)| m.get(*k).is_some_and(|x| shape(x, t)))
+}
+
+/// The table of a claim's track, by its service (§7.1).
+fn track_table(service: &str) -> Option<&'static [(&'static str, Ty)]> {
+    match service {
+        "captions" => Some(TRACK_CAPTIONS),
+        "audio-description" => Some(TRACK_DESCRIPTION),
+        "sign-language" => Some(TRACK_SIGN),
+        _ => None,
+    }
+}
+
+/// Every kind, in the order §8.2 step 3 checks them.
+pub const KINDS: [&str; 7] =
+    [kinds::SOURCES, kinds::REFERENCE, kinds::DESCRIPTION, kinds::SIGNING, kinds::REVIEW, kinds::QUALITY, kinds::CLAIM];
+
+fn table_of(kind: &str) -> Option<&'static [(&'static str, Ty)]> {
+    match kind {
+        kinds::SOURCES => Some(SOURCES),
+        kinds::REFERENCE => Some(REFERENCE),
+        kinds::QUALITY => Some(QUALITY),
+        kinds::DESCRIPTION => Some(DESCRIPTION),
+        kinds::SIGNING => Some(SIGNING),
+        kinds::REVIEW => Some(REVIEW),
+        kinds::CLAIM => Some(CLAIM),
+        _ => None,
+    }
+}
+
+/// One record read (§2): its value, its kind and its record id.
+#[derive(Clone, Debug)]
+pub struct Record {
+    pub value: Value,
+    pub kind: &'static str,
+    pub id: [u8; 32],
+}
+
+/// The bytes a record's signature covers (§2).
+pub fn signing_bytes(v: &Value) -> Vec<u8> {
+    let mut m = v.as_object().cloned().unwrap_or_default();
+    m.remove("sig");
+    let mut out = SIGN_DOMAIN.to_vec();
+    out.extend_from_slice(jcs(&Value::Object(m)).expect("a record is in the JCS subset").as_bytes());
+    out
+}
+
+/// A record's id: SHA-256 over its JCS form (§2).
+pub fn record_id(v: &Value) -> [u8; 32] {
+    sha(&[jcs(v).expect("a record is in the JCS subset").as_bytes()])
+}
+
+/// Sign `body` (a record without `signer_pubkey` and `sig`) with `key`: the record.
+pub fn sign(key: &SigningKey, mut body: Map<String, Value>) -> Value {
+    body.insert("signer_pubkey".into(), Value::String(hex(&key.verifying_key().to_bytes())));
+    body.remove("sig");
+    let unsigned = Value::Object(body.clone());
+    let sig = key.sign(&signing_bytes(&unsigned)).to_bytes();
+    body.insert("sig".into(), Value::String(hex(&sig)));
+    Value::Object(body)
+}
+
+/// The text of a record as the corpus writes it: its JCS form.
+pub fn text(v: &Value) -> String {
+    jcs(v).expect("a record is in the JCS subset")
+}
+
+/// Read one record's text (§2): JSON with a claim's limits, its shape, its signature.
+pub fn read(text: &str) -> Result<Record, Reason> {
+    let v = crate::claim_text::read(text).map_err(|_| Reason::RecordMalformed)?;
+    let named = v.get("kind").and_then(Value::as_str);
+    let kind = KINDS.into_iter().find(|k| Some(*k) == named).ok_or(Reason::RecordMalformed)?;
+    let table = table_of(kind).expect("every kind has a table");
+    if !obj_shape_claim(&v, table, kind) {
+        return Err(Reason::RecordMalformed);
+    }
+    let pk = unhex::<32>(v["signer_pubkey"].as_str().expect("shape")).expect("shape");
+    let sig = unhex::<64>(v["sig"].as_str().expect("shape")).expect("shape");
+    crate::sig::verify_strict(&pk, &signing_bytes(&v), &sig).map_err(|e| match e {
+        crate::sig::SigError::BadKey => Reason::BadKey,
+        crate::sig::SigError::BadSignature => Reason::BadSignature,
+    })?;
+    let id = record_id(&v);
+    Ok(Record { value: v, kind, id })
+}
+
+/// The shape of a record, with a claim's tracks read by their service's table.
+fn obj_shape_claim(v: &Value, table: &[(&str, Ty)], kind: &str) -> bool {
+    if kind != kinds::CLAIM {
+        return obj_shape(v, table);
+    }
+    let Some(m) = v.as_object() else { return false };
+    if m.len() != table.len() {
+        return false;
+    }
+    for (k, t) in table {
+        let Some(x) = m.get(*k) else { return false };
+        if *k == "tracks" {
+            let Some(a) = x.as_array() else { return false };
+            for tr in a {
+                let Some(service) = tr.get("service").and_then(Value::as_str) else { return false };
+                let Some(tt) = track_table(service) else { return false };
+                if !obj_shape(tr, tt) {
+                    return false;
+                }
+            }
+        } else if !shape(x, t) {
+            return false;
+        }
+    }
+    true
+}
+
+fn h32(v: &Value) -> [u8; 32] {
+    unhex::<32>(v.as_str().expect("a hex32 the shape admitted")).expect("a hex32 the shape admitted")
+}
+
+fn opt_h32(v: &Value) -> Option<[u8; 32]> {
+    v.as_str().map(|s| unhex::<32>(s).expect("a hex32 the shape admitted"))
+}
+
+fn int(v: &Value) -> u64 {
+    v.as_u64().expect("an int the shape admitted")
+}
+
+fn st(v: &Value) -> &str {
+    v.as_str().expect("a string the shape admitted")
+}
+
+// ---------------------------------------------------------------------------------------
+// §3 Words and their alignment
+// ---------------------------------------------------------------------------------------
+
+/// The set *P* of §3.1.
+pub const EDGE_PUNCTUATION: [char; 24] = [
+    '!', '"', '\'', '(', ')', ',', '-', '.', ':', ';', '?', '[', ']', '\u{a1}', '\u{ab}', '\u{bb}', '\u{bf}', '\u{2013}', '\u{2014}',
+    '\u{2018}', '\u{2019}', '\u{201c}', '\u{201d}', '\u{2026}',
+];
+
+/// The words of a text (§3.1).
+pub fn words(text: &str) -> Vec<String> {
+    text.split([' ', '\n'])
+        .filter(|p| !p.is_empty())
+        .filter_map(|p| {
+            let low: String = p.chars().map(|c| c.to_ascii_lowercase()).collect();
+            let w = low.trim_matches(|c| EDGE_PUNCTUATION.contains(&c));
+            (!w.is_empty()).then(|| w.to_string())
+        })
+        .collect()
+}
+
+/// The counts of an alignment (§3.2).
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub struct Counts {
+    pub words: u64,
+    pub errors: u64,
+    pub substitutions: u64,
+    pub deletions: u64,
+    pub insertions: u64,
+}
+
+impl Counts {
+    fn add(&mut self, o: Counts) {
+        self.words += o.words;
+        self.errors += o.errors;
+        self.substitutions += o.substitutions;
+        self.deletions += o.deletions;
+        self.insertions += o.insertions;
+    }
+
+    fn json(&self) -> Value {
+        json!({"words": self.words, "errors": self.errors, "substitutions": self.substitutions,
+               "deletions": self.deletions, "insertions": self.insertions})
+    }
+}
+
+/// The alignment of hypothesis `h` to reference `r` (§3.2), full or prefix.
+pub fn align(h: &[String], r: &[String], prefix: bool) -> Counts {
+    let (m, n) = (h.len(), r.len());
+    let mut d = vec![vec![0u64; n + 1]; m + 1];
+    for (j, x) in d[0].iter_mut().enumerate() {
+        *x = j as u64;
+    }
+    for (i, row) in d.iter_mut().enumerate() {
+        row[0] = i as u64;
+    }
+    for i in 1..=m {
+        for j in 1..=n {
+            let c = (h[i - 1] != r[j - 1]) as u64;
+            d[i][j] = (d[i - 1][j - 1] + c).min(d[i - 1][j] + 1).min(d[i][j - 1] + 1);
+        }
+    }
+    let end = if prefix {
+        let least = *d[m].iter().min().expect("a row of at least one column");
+        (0..=n).rev().find(|&j| d[m][j] == least).expect("the least is in the row")
+    } else {
+        n
+    };
+    let mut c = Counts { words: end as u64, errors: d[m][end], ..Default::default() };
+    let (mut i, mut j) = (m, end);
+    while i > 0 || j > 0 {
+        if i > 0 && j > 0 {
+            let cost = (h[i - 1] != r[j - 1]) as u64;
+            if d[i][j] == d[i - 1][j - 1] + cost {
+                c.substitutions += cost;
+                i -= 1;
+                j -= 1;
+                continue;
+            }
+        }
+        if i > 0 && d[i][j] == d[i - 1][j] + 1 {
+            c.insertions += 1;
+            i -= 1;
+        } else {
+            c.deletions += 1;
+            j -= 1;
+        }
+    }
+    debug_assert_eq!(c.substitutions + c.deletions + c.insertions, c.errors);
+    c
+}
+
+// ---------------------------------------------------------------------------------------
+// §4 Caption quality: the tracks a stream holds
+// ---------------------------------------------------------------------------------------
+
+/// One cue (§4.1): the positions of its revisions among the verifier's, first to last.
+#[derive(Clone, Debug)]
+pub struct CueChain {
+    pub revs: Vec<usize>,
+}
+
+/// What the events gave (§8.2 step 1).
+pub struct Stream {
+    pub room: [u8; 32],
+    pub revisions: Vec<Revision>,
+    pub accepted: Vec<le::Accepted>,
+    pub gaps: Vec<le::Gap>,
+}
+
+impl Stream {
+    /// The principals with a caption, in the order of their first `caption` event.
+    pub fn caption_principals(&self) -> Vec<[u8; 32]> {
+        let mut out = Vec::new();
+        for r in &self.revisions {
+            if !out.contains(&r.event.principal) {
+                out.push(r.event.principal);
+            }
+        }
+        out
+    }
+
+    /// The cues of `p`, in the stream order of their first revisions.
+    pub fn cues(&self, p: &[u8; 32]) -> Vec<CueChain> {
+        let mut out = Vec::new();
+        for (i, r) in self.revisions.iter().enumerate() {
+            if r.event.principal != *p || r.supersedes.is_some() || r.supersedes_digest.is_some() {
+                continue;
+            }
+            let mut revs = vec![i];
+            let mut k = i;
+            while let Some(n) = self.revisions[k].superseded_by {
+                revs.push(n);
+                k = n;
+            }
+            out.push(CueChain { revs });
+        }
+        out
+    }
+
+    fn head_digest(&self, c: &CueChain) -> [u8; 32] {
+        self.revisions[c.revs[0]].digest
+    }
+
+    fn last(&self, c: &CueChain) -> &Revision {
+        &self.revisions[*c.revs.last().expect("a cue has a revision")]
+    }
+
+    /// Whether `p`'s captions are whole (§4.1).
+    pub fn whole(&self, p: &[u8; 32]) -> bool {
+        let cues = self.cues(p);
+        !cues.is_empty()
+            && !self.gaps.iter().any(|g| g.principal == *p)
+            && cues.iter().all(|c| {
+                let r = self.last(c);
+                r.final_ && !r.unknown
+            })
+    }
+
+    /// Whether `p`'s captions are resolved (§4.1).
+    pub fn resolved(&self, p: &[u8; 32]) -> bool {
+        self.whole(p) && self.cues(p).iter().all(|c| self.last(c).caption.duration_ms > 0)
+    }
+
+    /// `p`'s events digest (§4.1).
+    pub fn events_digest(&self, p: &[u8; 32]) -> [u8; 32] {
+        let mut mine: Vec<&Revision> = self.revisions.iter().filter(|r| r.event.principal == *p).collect();
+        mine.sort_by_key(|r| r.event.seq);
+        let mut h = Sha256::new();
+        for r in mine {
+            h.update(r.digest);
+        }
+        h.finalize().into()
+    }
+
+    /// The opening commitment of `take` and the take derived (§4.2 rule 6): its offset.
+    fn take_offset(&self, take: &[u8; 32]) -> Option<i64> {
+        let opening = self.accepted.iter().find_map(|a| match &a.payload {
+            Payload::TakeCommit(b) => Commit::parse(b).ok().filter(|c| c.take == *take && c.n == 0 && c.phase == 1).map(|c| (a.event.principal, c.offset)),
+            _ => None,
+        })?;
+        let (author, offset) = opening;
+        let derived = self.accepted.iter().any(|a| {
+            matches!(&a.payload, Payload::Control { target, command: Command::RecordStart { .. } } if *target == author)
+                && take_id(&self.room, &author, &a.digest) == *take
+        });
+        derived.then_some(offset)
+    }
+
+    /// The media intervals of `p`'s resolved cues (timed-text §4.5), with `pt0`.
+    fn cue_intervals(&self, p: &[u8; 32], pt0: u64) -> Vec<(u64, u64)> {
+        self.cues(p)
+            .iter()
+            .map(|c| {
+                let head = &self.revisions[c.revs[0]];
+                let last = self.last(c);
+                (pt0 + head.event.t / 1000, pt0 + last.event.t / 1000 + last.caption.duration_ms as u64)
+            })
+            .collect()
+    }
+}
+
+/// A sources record, checked (§4.2): each cue's source instant `start` on the room clock.
+#[derive(Clone, Debug)]
+struct Sources {
+    id: [u8; 32],
+    /// Cue (head digest) → (`start` on the room clock, on the basis `take`).
+    starts: BTreeMap<[u8; 32], (i128, bool)>,
+}
+
+/// A reference record, checked (§4.3): its id, and each cue's (head digest) text.
+type Reference = ([u8; 32], BTreeMap<[u8; 32], String>);
+
+/// The verifier's state over the records (§8.2 steps 2 and 3).
+struct Run<'a> {
+    stream: &'a Stream,
+    records: Vec<Record>,
+    sources: BTreeMap<[u8; 32], Sources>,
+    references: BTreeMap<[u8; 32], Reference>,
+}
+
+fn sint(v: i128) -> Value {
+    Value::String(v.to_string())
+}
+
+impl Run<'_> {
+    /// Latencies of the cues `cues` of `p` that `p`'s sources record places (§4.4).
+    fn latencies(&self, p: &[u8; 32], cues: &[CueChain]) -> Vec<(i128, bool)> {
+        let Some(s) = self.sources.get(p) else { return Vec::new() };
+        cues.iter()
+            .filter_map(|c| {
+                let (start, take) = *s.starts.get(&self.stream.head_digest(c))?;
+                Some((self.stream.revisions[c.revs[0]].event.t as i128 - start, take))
+            })
+            .collect()
+    }
+
+    /// The figure of `p`'s whole track (§4.7).
+    fn figure(&self, p: &[u8; 32]) -> Value {
+        let s = self.stream;
+        let cues = s.cues(p);
+        let lat = self.latencies(p, &cues);
+        let mut sorted: Vec<i128> = lat.iter().map(|x| x.0).collect();
+        sorted.sort();
+        let n = sorted.len();
+        let latency = if n == 0 {
+            json!({"class": "none", "n": 0, "min": null, "max": null, "mean": null, "p50": null, "p95": null})
+        } else {
+            let sum: i128 = sorted.iter().sum();
+            let rank = |p: usize| sorted[(p * n).div_ceil(100) - 1];
+            let class = if lat.iter().all(|x| x.1) { "capture" } else { "stated" };
+            json!({"class": class, "n": n, "min": sint(sorted[0]), "max": sint(sorted[n - 1]),
+                   "mean": sint(sum.div_euclid(n as i128)), "p50": sint(rank(50)), "p95": sint(rank(95))})
+        };
+        let (mut revisions, mut changed_total, mut corrected) = (0u64, 0u64, 0u64);
+        for c in &cues {
+            revisions += (c.revs.len() - 1) as u64;
+            let mut changed = 0u64;
+            for w in c.revs.windows(2) {
+                let a = align(&words(&s.revisions[w[0]].caption.text), &words(&s.revisions[w[1]].caption.text), false);
+                changed += a.substitutions + a.insertions;
+            }
+            changed_total += changed;
+            corrected += (changed > 0) as u64;
+        }
+        let reference = self.references.get(p);
+        let class = if reference.is_some() {
+            "transcript"
+        } else if cues.iter().all(|c| matches!(s.last(c).caption.origin, tt::origin::HUMAN | tt::origin::REVIEWED)) {
+            "reviewed"
+        } else {
+            "self"
+        };
+        let (mut first, mut fin) = (Counts::default(), Counts::default());
+        for c in &cues {
+            let ref_text = match reference {
+                Some((_, entries)) => entries[&s.head_digest(c)].clone(),
+                None => s.last(c).caption.text.clone(),
+            };
+            let rw = words(&ref_text);
+            first.add(align(&words(&s.revisions[c.revs[0]].caption.text), &rw, true));
+            if reference.is_some() {
+                fin.add(align(&words(&s.last(c).caption.text), &rw, false));
+            }
+        }
+        json!({
+            "room": hex(&s.room),
+            "principal": hex(p),
+            "events": hex(&s.events_digest(p)),
+            "sources": self.sources.get(p).map(|x| hex(&x.id)),
+            "reference": reference.map(|x| hex(&x.0)),
+            "cues": cues.len(),
+            "latency": latency,
+            "stability": {"revisions": revisions, "words_changed": changed_total, "cues_corrected": corrected},
+            "accuracy": {"class": class, "first": first.json(), "final": if reference.is_some() { fin.json() } else { Value::Null }},
+        })
+    }
+
+    fn room_ok(&self, v: &Value) -> Result<(), Reason> {
+        if h32(&v["room"]) == self.stream.room {
+            Ok(())
+        } else {
+            Err(Reason::WrongRoom)
+        }
+    }
+
+    /// The head digests of `p`'s cues.
+    fn heads(&self, p: &[u8; 32]) -> Vec<[u8; 32]> {
+        self.stream.cues(p).iter().map(|c| self.stream.head_digest(c)).collect()
+    }
+
+    /// §4.2.
+    fn check_sources(&mut self, at: usize) -> Result<(), Reason> {
+        let v = self.records[at].value.clone();
+        self.room_ok(&v)?;
+        let p = h32(&v["principal"]);
+        if self.records[..at].iter().any(|r| r.kind == kinds::SOURCES && h32(&r.value["principal"]) == p) {
+            return Err(Reason::RecordConflict);
+        }
+        let entries = v["sources"].as_array().expect("shape");
+        let mut seen = BTreeSet::new();
+        for e in entries {
+            let take = e["basis"] == "take";
+            if take != e["take"].is_string() || int(&e["start"]) > int(&e["end"]) || !seen.insert(h32(&e["cue"])) {
+                return Err(Reason::RecordMalformed);
+            }
+        }
+        if !self.stream.whole(&p) {
+            return Err(Reason::StreamIncomplete);
+        }
+        let heads = self.heads(&p);
+        if entries.iter().any(|e| !heads.contains(&h32(&e["cue"]))) {
+            return Err(Reason::SourceUnknown);
+        }
+        let mut starts = BTreeMap::new();
+        for e in entries {
+            let start = int(&e["start"]) as i128;
+            let placed = if e["basis"] == "take" {
+                let o = self.stream.take_offset(&h32(&e["take"])).ok_or(Reason::SourceTakeUnknown)?;
+                let s = start + o as i128;
+                if s < 0 {
+                    return Err(Reason::SourceTakeUnknown);
+                }
+                (s, true)
+            } else {
+                (start, false)
+            };
+            starts.insert(h32(&e["cue"]), placed);
+        }
+        let id = self.records[at].id;
+        self.sources.entry(p).or_insert(Sources { id, starts });
+        Ok(())
+    }
+
+    /// §4.3.
+    fn check_reference(&mut self, at: usize) -> Result<(), Reason> {
+        let v = self.records[at].value.clone();
+        self.room_ok(&v)?;
+        let p = h32(&v["principal"]);
+        if self.records[..at].iter().any(|r| r.kind == kinds::REFERENCE && h32(&r.value["principal"]) == p) {
+            return Err(Reason::RecordConflict);
+        }
+        let entries = v["entries"].as_array().expect("shape");
+        let mut map = BTreeMap::new();
+        for e in entries {
+            if map.insert(h32(&e["cue"]), st(&e["text"]).to_string()).is_some() {
+                return Err(Reason::RecordMalformed);
+            }
+        }
+        if map.values().any(|t| !tt::text_in_subset(t)) {
+            return Err(Reason::TextNotInSubset);
+        }
+        if !self.stream.whole(&p) {
+            return Err(Reason::StreamIncomplete);
+        }
+        let heads = self.heads(&p);
+        if map.keys().any(|k| !heads.contains(k)) {
+            return Err(Reason::ReferenceUnknown);
+        }
+        if heads.iter().any(|h| !map.contains_key(h)) {
+            return Err(Reason::ReferenceIncomplete);
+        }
+        let id = self.records[at].id;
+        self.references.entry(p).or_insert((id, map));
+        Ok(())
+    }
+
+    /// §4.7.
+    fn check_quality(&self, at: usize) -> Result<(), Reason> {
+        let v = &self.records[at].value;
+        self.room_ok(v)?;
+        let p = h32(&v["principal"]);
+        if !self.stream.whole(&p) {
+            return Err(Reason::StreamIncomplete);
+        }
+        let f = self.figure(&p);
+        for k in ["events", "sources", "reference"] {
+            if v[k] != f[k] {
+                return Err(Reason::FigureInputsMismatch);
+            }
+        }
+        for (k, x) in f.as_object().expect("an object") {
+            if v[k] != *x {
+                return Err(Reason::FigureMismatch);
+            }
+        }
+        Ok(())
+    }
+
+    /// §6.2.
+    fn check_signing(&self, at: usize) -> Result<(), Reason> {
+        let v = &self.records[at].value;
+        self.room_ok(v)?;
+        let machine = st(&v["origin"]) != "human";
+        let video = st(&v["form"]) == "video";
+        let segs = v["segments"].as_array().expect("shape");
+        let mut ok = le::lang_tag_ok(st(&v["lang"])) && machine == v["model"].is_string() && video == v["video"].is_object();
+        if let Some(vd) = v["video"].as_object() {
+            ok &= ["width", "height", "rate_num", "rate_den"].iter().all(|k| int(&vd[*k]) > 0);
+        }
+        ok &= !segs.is_empty();
+        let mut prev_end = 0u64;
+        let mut named = BTreeSet::new();
+        for (i, s) in segs.iter().enumerate() {
+            let (a, b) = (int(&s["start"]), int(&s["end"]));
+            let revs = s["revisions"].as_array().expect("shape");
+            ok &= a < b && !revs.is_empty() && (i == 0 || a >= prev_end);
+            prev_end = b;
+            for r in revs {
+                ok &= named.insert(h32(r));
+            }
+        }
+        if !ok {
+            return Err(Reason::SigningMalformed);
+        }
+        let src = h32(&v["source"]);
+        if !self.stream.whole(&src) {
+            return Err(Reason::StreamIncomplete);
+        }
+        let revs: Vec<&Revision> = self.stream.revisions.iter().filter(|r| r.event.principal == src).collect();
+        for d in &named {
+            if !revs.iter().any(|r| r.digest == *d) {
+                return Err(Reason::SignRevisionUnknown);
+            }
+        }
+        for d in &named {
+            let r = revs.iter().find(|r| r.digest == *d).expect("held");
+            if r.superseded_by.is_some() || !r.final_ || r.unknown {
+                return Err(Reason::SignRevisionNotFinal);
+            }
+        }
+        Ok(())
+    }
+
+    /// The head digest of the cue whose last revision is `d`, of `src`.
+    fn cue_of_final(&self, src: &[u8; 32], d: &[u8; 32]) -> Option<CueChain> {
+        self.stream.cues(src).into_iter().find(|c| self.stream.last(c).digest == *d)
+    }
+
+    /// A segment's offset (§6.3).
+    fn segment_offset(&self, src: &[u8; 32], seg: &Value) -> Option<i128> {
+        let cues: Vec<CueChain> =
+            seg["revisions"].as_array().expect("shape").iter().filter_map(|r| self.cue_of_final(src, &h32(r))).collect();
+        let earliest = cues.iter().min_by_key(|c| (self.stream.revisions[c.revs[0]].event.t, c.revs[0]))?;
+        let s = self.sources.get(src)?;
+        let (start, _) = s.starts.get(&self.stream.head_digest(earliest))?;
+        Some(int(&seg["start"]) as i128 - start)
+    }
+
+    /// §6.4.
+    fn check_review(&self, at: usize) -> Result<(), Reason> {
+        let v = &self.records[at].value;
+        if (st(&v["verdict"]) == "approved") != v["notes"].is_null() {
+            return Err(Reason::RecordMalformed);
+        }
+        let target = h32(&v["signing"]);
+        if !self.records.iter().any(|r| r.kind == kinds::SIGNING && r.id == target) {
+            return Err(Reason::ReviewSubjectUnknown);
+        }
+        Ok(())
+    }
+
+    /// §7.2.
+    fn check_claim(&self, at: usize) -> Result<(), Reason> {
+        let v = &self.records[at].value;
+        self.room_ok(v)?;
+        let (from, to, pt0) = (int(&v["from"]), int(&v["to"]), int(&v["pt0"]));
+        let tracks = v["tracks"].as_array().expect("shape");
+        let mut ok = from < to && !tracks.is_empty();
+        let (mut principals, mut recs) = (BTreeSet::new(), BTreeSet::new());
+        for t in tracks {
+            ok &= le::lang_tag_ok(st(&t["lang"]));
+            if t["service"] == "captions" {
+                ok &= principals.insert(h32(&t["principal"]));
+            } else {
+                ok &= recs.insert(h32(&t["record"]));
+            }
+        }
+        if !ok {
+            return Err(Reason::ClaimMalformed);
+        }
+        let in_session = |p: &[u8; 32]| -> Vec<CueChain> {
+            self.stream.cues(p).into_iter().filter(|c| (from..to).contains(&self.stream.revisions[c.revs[0]].event.t)).collect()
+        };
+        let (m_from, m_to) = (pt0 + from / 1000, pt0 + to / 1000);
+        for t in tracks {
+            match st(&t["service"]) {
+                "captions" => {
+                    let p = h32(&t["principal"]);
+                    let cues = in_session(&p);
+                    if cues.is_empty() {
+                        return Err(Reason::TrackMissing);
+                    }
+                    if !self.stream.resolved(&p) {
+                        return Err(Reason::TrackIncomplete);
+                    }
+                    let lang = st(&t["lang"]);
+                    if cues.iter().any(|c| c.revs.iter().any(|&r| self.stream.revisions[r].caption.lang != lang)) {
+                        return Err(Reason::TrackMismatch);
+                    }
+                    let (mean_max, max) = (t["latency_mean_max"].as_u64(), t["latency_max"].as_u64());
+                    if mean_max.is_some() || max.is_some() {
+                        let lat = self.latencies(&p, &cues);
+                        if lat.len() != cues.len() {
+                            return Err(Reason::SyncUnmeasured);
+                        }
+                        let sum: i128 = lat.iter().map(|x| x.0).sum();
+                        let mean = sum.div_euclid(lat.len() as i128);
+                        if mean_max.is_some_and(|m| mean > m as i128) || max.is_some_and(|m| lat.iter().any(|x| x.0 > m as i128)) {
+                            return Err(Reason::OutOfSync);
+                        }
+                    }
+                }
+                "audio-description" => {
+                    let id = h32(&t["record"]);
+                    let d = self.records.iter().find(|r| r.kind == kinds::DESCRIPTION && r.id == id).ok_or(Reason::TrackMissing)?;
+                    let dv = &d.value;
+                    let events = dv["events"].as_array().expect("shape");
+                    if st(&dv["lang"]) != st(&t["lang"]) || events.iter().any(|e| int(&e["begin"]) < m_from || int(&e["end"]) > m_to) {
+                        return Err(Reason::TrackMismatch);
+                    }
+                    if dv["voicing"]["form"] == "track" && events.iter().any(|e| e["voice"].is_null()) {
+                        return Err(Reason::TrackIncomplete);
+                    }
+                }
+                _ => {
+                    let id = h32(&t["record"]);
+                    let g = self.records.iter().find(|r| r.kind == kinds::SIGNING && r.id == id).ok_or(Reason::TrackMissing)?;
+                    let gv = &g.value;
+                    let src = h32(&gv["source"]);
+                    if st(&gv["lang"]) != st(&t["lang"]) || !principals.contains(&src) {
+                        return Err(Reason::TrackMismatch);
+                    }
+                    let named: BTreeSet<[u8; 32]> = gv["segments"]
+                        .as_array()
+                        .expect("shape")
+                        .iter()
+                        .flat_map(|s| s["revisions"].as_array().expect("shape").iter().map(h32))
+                        .collect();
+                    if in_session(&src).iter().any(|c| !named.contains(&self.stream.last(c).digest)) {
+                        return Err(Reason::TrackIncomplete);
+                    }
+                    if let Some(rid) = opt_h32(&t["review"]) {
+                        let r = self.records.iter().find(|r| r.kind == kinds::REVIEW && r.id == rid).ok_or(Reason::ReviewMissing)?;
+                        if h32(&r.value["signing"]) != id {
+                            return Err(Reason::ReviewMismatch);
+                        }
+                        if r.value["verdict"] == "rejected" {
+                            return Err(Reason::ReviewRejected);
+                        }
+                    }
+                    if let Some(m) = t["offset_max"].as_u64() {
+                        let mut offs = Vec::new();
+                        for s in gv["segments"].as_array().expect("shape") {
+                            offs.push(self.segment_offset(&src, s).ok_or(Reason::SyncUnmeasured)?);
+                        }
+                        if offs.iter().any(|o| o.unsigned_abs() > m as u128) {
+                            return Err(Reason::OutOfSync);
+                        }
+                    }
+                }
+            }
+        }
+        Ok(())
+    }
+
+    /// A claim's dialogue overlap (§7.2, §5.4).
+    fn claim_overlap(&self, r: &Record) -> Value {
+        let v = &r.value;
+        let pt0 = int(&v["pt0"]);
+        let tracks = v["tracks"].as_array().expect("shape");
+        let mut dialogue: Vec<(u64, u64)> = Vec::new();
+        for t in tracks.iter().filter(|t| t["service"] == "captions") {
+            dialogue.extend(self.stream.cue_intervals(&h32(&t["principal"]), pt0));
+        }
+        let union = merge(dialogue);
+        let mut out = Vec::new();
+        for (i, t) in tracks.iter().enumerate().filter(|(_, t)| t["service"] == "audio-description") {
+            let d = self.records.iter().find(|d| d.kind == kinds::DESCRIPTION && d.id == h32(&t["record"])).expect("checked");
+            let (ms, n) = overlap(&d.value, &union);
+            out.push(json!({"track": i, "ms": ms, "events": n}));
+        }
+        json!({"record": hex(&r.id), "overlap": out})
+    }
+}
+
+/// The union of intervals, as disjoint intervals in order.
+fn merge(mut xs: Vec<(u64, u64)>) -> Vec<(u64, u64)> {
+    xs.sort();
+    let mut out: Vec<(u64, u64)> = Vec::new();
+    for (a, b) in xs {
+        match out.last_mut() {
+            Some(last) if a <= last.1 => last.1 = last.1.max(b),
+            _ => out.push((a, b)),
+        }
+    }
+    out
+}
+
+/// A description's spoken interval of each event (§5.3, §5.4).
+fn spoken(e: &Value) -> (u64, u64) {
+    match e["voice"].as_object() {
+        Some(v) => (int(&v["begin"]), int(&v["end"])),
+        None => {
+            let r = int(&e["duck"]["ramp"]);
+            (int(&e["begin"]) + r, int(&e["end"]) - r)
+        }
+    }
+}
+
+/// §5.4: the sum of the events' overlaps with `union`, and how many overlap.
+fn overlap(d: &Value, union: &[(u64, u64)]) -> (u64, u64) {
+    let (mut ms, mut n) = (0u64, 0u64);
+    for e in d["events"].as_array().expect("shape") {
+        let (a, b) = spoken(e);
+        let o: u64 = union.iter().map(|&(x, y)| b.min(y).saturating_sub(a.max(x))).sum();
+        ms += o;
+        n += (o > 0) as u64;
+    }
+    (ms, n)
+}
+
+/// Whether an `id` of a description event has §5.2 rule 3's form.
+fn id_ok(s: &str) -> bool {
+    let b = s.as_bytes();
+    !b.is_empty()
+        && b.len() <= 64
+        && (b[0].is_ascii_alphabetic() || b[0] == b'_')
+        && b[1..].iter().all(|&c| c.is_ascii_alphanumeric() || matches!(c, b'_' | b'.' | b'-'))
+}
+
+/// §5.2: a description's rules.
+pub fn check_description(v: &Value) -> Result<(), Reason> {
+    let m = Reason::DescriptionMalformed;
+    if !le::lang_tag_ok(st(&v["lang"])) {
+        return Err(m);
+    }
+    let (script, voicing) = (&v["script"], &v["voicing"]);
+    let machine = |o: &Value| st(o) != "human";
+    let sink = voicing["form"] == "sink";
+    if machine(&script["origin"]) != script["model"].is_string()
+        || machine(&voicing["origin"]) != voicing["model"].is_string()
+        || sink == voicing["track"].is_string()
+        || (sink && voicing["origin"] == "human")
+    {
+        return Err(m);
+    }
+    let events = v["events"].as_array().expect("shape");
+    if events.is_empty() {
+        return Err(m);
+    }
+    let mut ids = BTreeSet::new();
+    let mut prev_end = 0u64;
+    for (i, e) in events.iter().enumerate() {
+        let (b, en) = (int(&e["begin"]), int(&e["end"]));
+        if !id_ok(st(&e["id"])) || !ids.insert(st(&e["id"]).to_string()) || b >= en || en > MAX_MS || (i > 0 && b < prev_end) {
+            return Err(m);
+        }
+        prev_end = en;
+    }
+    if events.iter().any(|e| !tt::text_in_subset(st(&e["text"]))) {
+        return Err(Reason::TextNotInSubset);
+    }
+    for e in events {
+        let (b, en) = (int(&e["begin"]), int(&e["end"]));
+        let (g, r) = (int(&e["duck"]["gain"]), int(&e["duck"]["ramp"]));
+        let duck_ok = g <= 1000 && ((g == 1000) == (r == 0)) && 2 * r <= en - b;
+        let voice_ok = match e["voice"].as_object() {
+            None => true,
+            Some(vo) => !sink && b <= int(&vo["begin"]) && int(&vo["begin"]) < int(&vo["end"]) && int(&vo["end"]) <= en,
+        };
+        if !duck_ok || !voice_ok {
+            return Err(m);
+        }
+    }
+    for e in events {
+        if let Some(vo) = e["voice"].as_object() {
+            let r = int(&e["duck"]["ramp"]);
+            let (a, z) = (int(&e["begin"]) + r, int(&e["end"]) - r);
+            let (vb, ve) = (int(&vo["begin"]), int(&vo["end"]));
+            if vb + EARLY_MS < a || vb > a + LATE_MS || ve > z + LATE_MS {
+                return Err(Reason::DescriptionOutOfSync);
+            }
+        }
+    }
+    Ok(())
+}
+
+/// A description's figures (§8.2 step 4).
+fn description_figures(id: &[u8; 32], v: &Value) -> Value {
+    let events = v["events"].as_array().expect("shape");
+    let offsets: Vec<Value> = events
+        .iter()
+        .map(|e| match e["voice"].as_object() {
+            Some(vo) => sint(int(&vo["begin"]) as i128 - (int(&e["begin"]) + int(&e["duck"]["ramp"])) as i128),
+            None => Value::Null,
+        })
+        .collect();
+    json!({"record": hex(id), "events": events.len(), "voiced": events.iter().filter(|e| !e["voice"].is_null()).count(), "offsets": offsets})
+}
+
+// ---------------------------------------------------------------------------------------
+// §5.5 The DAPT document
+// ---------------------------------------------------------------------------------------
+
+fn param_ok(s: &str) -> bool {
+    !s.is_empty() && s.len() <= 2048 && s.bytes().all(|c| (b'!'..=b'~').contains(&c) && !matches!(c, b'"' | b'&' | b'<' | b'>'))
+}
+
+fn gain(g: u64) -> String {
+    if g == 0 {
+        return "0".into();
+    }
+    if g == 1000 {
+        return "1".into();
+    }
+    let digits = format!("{g:03}");
+    format!("0.{}", digits.trim_end_matches('0'))
+}
+
+fn esc(s: &str) -> String {
+    s.replace('&', "&amp;").replace('<', "&lt;").replace('>', "&gt;").replace('\n', "<br/>")
+}
+
+/// The DAPT document of a description record that §5.2 accepts (§5.5): `uri` and `media_type`
+/// name the voicing track for the form `track`.
+pub fn dapt(v: &Value, uri: &str, media_type: &str) -> Result<String, Reason> {
+    let track = v["voicing"]["form"] == "track";
+    if track && (!param_ok(uri) || !param_ok(media_type)) {
+        return Err(Reason::ParameterMalformed);
+    }
+    let events = v["events"].as_array().expect("shape");
+    let mut reps: Vec<&str> = Vec::new();
+    for e in events {
+        let r = st(&e["represents"]);
+        if !reps.contains(&r) {
+            reps.push(r);
+        }
+    }
+    let label = |o: &Value, name: &str| {
+        let mut s = format!(" wai:{name}=\"{}\"", st(&o["origin"]));
+        if let Some(m) = o["model"].as_str() {
+            s.push_str(&format!(" wai:{name}-model=\"{m}\""));
+        }
+        s
+    };
+    let mut o = String::from("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
+    o.push_str(&format!(
+        "<tt xmlns=\"http://www.w3.org/ns/ttml\" xmlns:ttp=\"http://www.w3.org/ns/ttml#parameter\" xmlns:tta=\"http://www.w3.org/ns/ttml#audio\" xmlns:daptm=\"http://www.w3.org/ns/ttml/profile/dapt#metadata\" xmlns:wai=\"{XML_NS}\" xml:lang=\"{}\" ttp:contentProfiles=\"{DAPT_CONTENT}\" daptm:langSrc=\"zxx\" daptm:scriptRepresents=\"{}\" daptm:scriptType=\"{}\"{}{}>\n",
+        st(&v["lang"]),
+        reps.join(" "),
+        if track { "asRecorded" } else { "preRecording" },
+        label(&v["script"], "script"),
+        label(&v["voicing"], "voice"),
+    ));
+    o.push_str("<body>\n");
+    for e in events {
+        let (b, en) = (int(&e["begin"]), int(&e["end"]));
+        let (g, r) = (int(&e["duck"]["gain"]), int(&e["duck"]["ramp"]));
+        o.push_str(&format!(
+            "<div xml:id=\"{}\" begin=\"{}\" end=\"{}\" daptm:represents=\"{}\">\n",
+            st(&e["id"]),
+            tt::timestamp(b),
+            tt::timestamp(en),
+            st(&e["represents"])
+        ));
+        if g < 1000 {
+            let gs = gain(g);
+            o.push_str(&format!(
+                "<animate begin=\"00:00:00.000\" end=\"{}\" tta:gain=\"1;{gs}\" fill=\"freeze\"/>\n",
+                tt::timestamp(r)
+            ));
+            o.push_str(&format!(
+                "<animate begin=\"{}\" end=\"{}\" tta:gain=\"{gs};1\"/>\n",
+                tt::timestamp(en - b - r),
+                tt::timestamp(en - b)
+            ));
+        }
+        let text = esc(st(&e["text"]));
+        let content = match (track, e["voice"].as_object()) {
+            (true, Some(vo)) => {
+                let (vb, ve) = (int(&vo["begin"]), int(&vo["end"]));
+                format!(
+                    "<span begin=\"{}\" end=\"{}\"><audio src=\"{uri}\" type=\"{media_type}\" clipBegin=\"{}\" clipEnd=\"{}\"/>{text}</span>",
+                    tt::timestamp(vb - b),
+                    tt::timestamp(ve - b),
+                    tt::timestamp(vb),
+                    tt::timestamp(ve)
+                )
+            }
+            (true, None) => text,
+            (false, _) => format!("<span tta:speak=\"normal\">{text}</span>"),
+        };
+        o.push_str(&format!("<p>{content}</p>\n</div>\n"));
+    }
+    o.push_str("</body>\n</tt>\n");
+    Ok(o)
+}
+
+// ---------------------------------------------------------------------------------------
+// §8 Verification
+// ---------------------------------------------------------------------------------------
+
+/// Where a refusal is (§8.2).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum Outcome {
+    /// Accept, with the figures of §8.2 step 4.
+    Accept(Value),
+    /// A refusal at `events` (an event record) or `record` (one of this extension's), its
+    /// index, and its reason's code.
+    Refuse { at: &'static str, index: usize, reason: &'static str },
+}
+
+/// Verify a room's events and records (§8).
+pub fn verify(room: [u8; 32], events: &[Vec<u8>], records: &[String]) -> Outcome {
+    let mut cv = CaptionVerifier::new(room, le::Policy::default());
+    match tt::verify_stream(&mut cv, events) {
+        tt::Outcome::Refuse { index, reason } => return Outcome::Refuse { at: "events", index, reason },
+        tt::Outcome::Gap(_) | tt::Outcome::Accept => {}
+    }
+    let stream = Stream {
+        room,
+        revisions: cv.revisions().to_vec(),
+        accepted: cv.events.accepted().to_vec(),
+        gaps: cv.events.gaps().to_vec(),
+    };
+    verify_records(&stream, records)
+}
+
+/// §8.2 steps 2 to 4, over a stream already verified.
+pub fn verify_records(stream: &Stream, records: &[String]) -> Outcome {
+    let mut read_all = Vec::new();
+    for (i, t) in records.iter().enumerate() {
+        match read(t) {
+            Ok(r) => read_all.push(r),
+            Err(e) => return Outcome::Refuse { at: "record", index: i, reason: e.code() },
+        }
+    }
+    let mut run = Run { stream, records: read_all, sources: BTreeMap::new(), references: BTreeMap::new() };
+    for kind in KINDS {
+        for i in 0..run.records.len() {
+            if run.records[i].kind != kind {
+                continue;
+            }
+            let res = match kind {
+                kinds::SOURCES => run.check_sources(i),
+                kinds::REFERENCE => run.check_reference(i),
+                kinds::QUALITY => run.check_quality(i),
+                kinds::DESCRIPTION => check_description(&run.records[i].value),
+                kinds::SIGNING => run.check_signing(i),
+                kinds::REVIEW => run.check_review(i),
+                _ => run.check_claim(i),
+            };
+            if let Err(e) = res {
+                return Outcome::Refuse { at: "record", index: i, reason: e.code() };
+            }
+        }
+    }
+    let captions: Vec<Value> = stream.caption_principals().iter().filter(|p| stream.whole(p)).map(|p| run.figure(p)).collect();
+    let descriptions: Vec<Value> =
+        run.records.iter().filter(|r| r.kind == kinds::DESCRIPTION).map(|r| description_figures(&r.id, &r.value)).collect();
+    let signings: Vec<Value> = run
+        .records
+        .iter()
+        .filter(|r| r.kind == kinds::SIGNING)
+        .map(|r| {
+            let v = &r.value;
+            let src = h32(&v["source"]);
+            let segs = v["segments"].as_array().expect("shape");
+            let offsets: Vec<Value> = segs.iter().map(|s| run.segment_offset(&src, s).map_or(Value::Null, sint)).collect();
+            let floor = v["video"].as_object().map(|vd| {
+                let (w, h) = (int(&vd["width"]), int(&vd["height"]));
+                let meets = w.min(h) >= 240 && w.max(h) >= 320 && int(&vd["rate_num"]) >= 20 * int(&vd["rate_den"]);
+                if meets { "meets" } else { "below" }
+            });
+            let named: usize = segs.iter().map(|s| s["revisions"].as_array().expect("shape").len()).sum();
+            json!({"record": hex(&r.id), "segments": segs.len(), "revisions": named, "offsets": offsets, "video_floor": floor})
+        })
+        .collect();
+    let claims: Vec<Value> = run.records.iter().filter(|r| r.kind == kinds::CLAIM).map(|r| run.claim_overlap(r)).collect();
+    Outcome::Accept(json!({"captions": captions, "descriptions": descriptions, "signings": signings, "claims": claims}))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn w(s: &str) -> Vec<String> {
+        words(s)
+    }
+
+    #[test]
+    fn words_fold_ascii_case_and_strip_edge_punctuation() {
+        assert_eq!(w("The moon, \u{201c}pulls\u{201d}\nthe SEA."), ["the", "moon", "pulls", "the", "sea"]);
+        assert_eq!(w("- ... ¿Qué?"), ["qué"]);
+        assert_eq!(w("Ünïcode keeps CASE"), ["Ünïcode", "keeps", "case"]);
+        assert_eq!(w("it's twice-daily"), ["it's", "twice-daily"]);
+    }
+
+    #[test]
+    fn a_full_alignment_counts_each_kind() {
+        let a = align(&w("the cap sat on mat"), &w("the cat sat on the mat"), false);
+        assert_eq!(a, Counts { words: 6, errors: 2, substitutions: 1, deletions: 1, insertions: 0 });
+        let a = align(&w("a b c"), &w(""), false);
+        assert_eq!(a, Counts { words: 0, errors: 3, substitutions: 0, deletions: 0, insertions: 3 });
+        let a = align(&w(""), &w("a b"), false);
+        assert_eq!(a, Counts { words: 2, errors: 2, substitutions: 0, deletions: 2, insertions: 0 });
+    }
+
+    #[test]
+    fn a_prefix_alignment_reads_only_as_far_as_the_hypothesis_reaches() {
+        // A partial that has not reached the end of the speech makes no error.
+        let a = align(&w("the moon pulls"), &w("the moon pulls the sea"), true);
+        assert_eq!(a, Counts { words: 3, errors: 0, ..Default::default() });
+        // A wrong last word is a substitution against the word it stands for, not an
+        // insertion before it: the greatest column with the least errors.
+        let a = align(&w("high tied"), &w("high tide comes twice a day"), true);
+        assert_eq!(a, Counts { words: 2, errors: 1, substitutions: 1, ..Default::default() });
+        let a = align(&w(""), &w("anything"), true);
+        assert_eq!(a, Counts::default());
+    }
+
+    #[test]
+    fn signed_integers_are_read_from_their_spelling() {
+        for ok in ["0", "-1", "45", "9223372036854775807", "-9223372036854775808"] {
+            assert!(is_sint(ok), "{ok}");
+        }
+        for bad in ["", "-", "-0", "01", "+1", "1.0", "9223372036854775808", " 1"] {
+            assert!(!is_sint(bad), "{bad}");
+        }
+    }
+
+    #[test]
+    fn gains_are_written_without_trailing_zeros() {
+        assert_eq!([gain(0), gain(5), gain(390), gain(500), gain(999), gain(1000)], ["0", "0.005", "0.39", "0.5", "0.999", "1"]);
+    }
+
+    #[test]
+    fn every_reason_has_one_code() {
+        let codes: BTreeSet<&str> = Reason::ALL.iter().map(|r| r.code()).collect();
+        assert_eq!(codes.len(), Reason::ALL.len());
+        for r in Reason::ALL {
+            assert_eq!(Reason::from_code(r.code()), Some(r));
+        }
+    }
+}
diff --git a/wai/wai-rs/src/access_services/corpus.rs b/wai/wai-rs/src/access_services/corpus.rs
new file mode 100644
index 000000000..749184fe8
--- /dev/null
+++ b/wai/wai-rs/src/access_services/corpus.rs
@@ -0,0 +1,718 @@
+//! The conformance corpus of extensions/access-services.md §11: `live-conformance/access/`.
+//!
+//! [`generate`] writes it from fixed seeds: every key, model, track and object digest is
+//! SHA-256 of a fixed label and an index, the room id likewise, every time is a constant, and
+//! Ed25519 signing is deterministic (RFC 8032), so every file is the same bytes on every
+//! machine. Each vector is written with the outcome it is meant to have, and the generator
+//! asserts, before it writes them, that this module gives it that outcome and that every
+//! reason of §10 refuses a vector.
+//!
+//! [`verify`] checks a corpus directory's files against this module.
+//! `live-conformance/access_services_verify.py` checks the same files from the extension's
+//! text, sharing no code with this module.
+
+use super::*;
+use crate::capture_take::{phase, Commit};
+use crate::live_events::{kind, Caption, Event};
+use crate::timed_text::{origin, Anchor, Annotation};
+use std::collections::BTreeMap;
+
+/// The media time of the room's `t0`, in milliseconds.
+pub const PT0_MS: u64 = 10_000;
+/// The offset of the lesson's take: a device-clock instant *d* is the room-clock *d* + this.
+pub const TAKE_OFFSET: i64 = -499_000_000;
+
+const CAPTIONER: u8 = 1;
+const ASR: u8 = 2;
+const HOST: u8 = 3;
+const DEVICE: u8 = 4;
+const ALIGNER: u8 = 5;
+const REVIEWER: u8 = 6;
+const DESCRIBER: u8 = 7;
+const INTERPRETER: u8 = 8;
+const VENDOR: u8 = 9;
+const AUTHORITY: u8 = 10;
+const NAMES: [(&str, u8); 10] = [
+    ("captioner", CAPTIONER),
+    ("asr", ASR),
+    ("host", HOST),
+    ("device", DEVICE),
+    ("aligner", ALIGNER),
+    ("reviewer", REVIEWER),
+    ("describer", DESCRIBER),
+    ("interpreter", INTERPRETER),
+    ("vendor", VENDOR),
+    ("authority", AUTHORITY),
+];
+
+const VOICING_URI: &str = "https://media.example/lesson/description.mp4";
+const VOICING_TYPE: &str = "audio/mp4";
+
+fn label(l: &[u8], i: &[u8]) -> [u8; 32] {
+    sha(&[b"wai:access/corpus/", l, b"\x00", i])
+}
+
+fn key(i: u8) -> SigningKey {
+    SigningKey::from_bytes(&label(b"key", &[i]))
+}
+
+fn pk(i: u8) -> [u8; 32] {
+    key(i).verifying_key().to_bytes()
+}
+
+/// The room every vector's events belong to.
+pub fn room() -> [u8; 32] {
+    label(b"room", &[1])
+}
+
+fn model(i: u8) -> [u8; 32] {
+    label(b"model", &[i])
+}
+
+fn track(i: u8) -> [u8; 32] {
+    label(b"track", &[i])
+}
+
+fn object(a: u8, b: u8) -> [u8; 32] {
+    label(b"object", &[a, b])
+}
+
+/// A digest that names nothing the corpus holds.
+fn nothing(i: u8) -> [u8; 32] {
+    label(b"nothing", &[i])
+}
+
+fn h(b: &[u8; 32]) -> Value {
+    Value::String(hex(b))
+}
+
+/// A principal emitting its chain.
+struct Author {
+    key: SigningKey,
+    seq: u64,
+    prev: [u8; 32],
+}
+
+impl Author {
+    fn new(i: u8) -> Self {
+        Author { key: key(i), seq: 0, prev: [0; 32] }
+    }
+
+    fn raw(&mut self, out: &mut Vec<Vec<u8>>, t: u64, k: u8, payload: Vec<u8>) -> [u8; 32] {
+        let ev = Event::sign(&self.key, room(), self.seq, self.prev, t, None, k, payload);
+        self.seq += 1;
+        self.prev = ev.digest();
+        out.push(ev.to_bytes());
+        self.prev
+    }
+
+    #[allow(clippy::too_many_arguments)]
+    fn caption(&mut self, out: &mut Vec<Vec<u8>>, t: u64, d: u32, o: u8, m: Option<[u8; 32]>, text: &str) -> [u8; 32] {
+        let c = Caption { duration_ms: d, origin: o, model: m, lang: "en".into(), text: text.into() };
+        self.raw(out, t, kind::CAPTION, Payload::Caption(c).encode())
+    }
+
+    fn annotate(&mut self, out: &mut Vec<Vec<u8>>, t: u64, supersedes: [u8; 32], final_: bool, stable: &str) -> [u8; 32] {
+        let a = Annotation { supersedes, final_, stable_cp: stable.chars().count() as u16, anchor: Anchor::BottomCenter, italic: vec![] };
+        self.raw(out, t, kind::META, a.to_bytes())
+    }
+}
+
+/// The digests of a stream's events that records name.
+type Digests = BTreeMap<&'static str, [u8; 32]>;
+
+/// A defect of the lesson's stream.
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum StreamDefect {
+    None,
+    /// The captioner's second event names a `prev` that is not its first's.
+    ChainBroken,
+    /// An annotation of the machine captions supersedes a revision no one wrote.
+    SupersedeUnknown,
+    /// The machine captions' second cue's partial and its annotation are not delivered.
+    Gap,
+}
+
+/// The lesson: a human captioner, machine captions revised to final, and a take whose
+/// opening commitment places the machine captions' words.
+fn lesson_stream(defect: StreamDefect) -> (Vec<Vec<u8>>, Digests) {
+    let s = 1_000_000u64;
+    let mut out = Vec::new();
+    let mut d = Digests::new();
+    let (mut cap, mut asr, mut host, mut dev) = (Author::new(CAPTIONER), Author::new(ASR), Author::new(HOST), Author::new(DEVICE));
+    let m1 = Some(model(1));
+    let start = host.raw(&mut out, s, kind::CONTROL, Payload::Control { target: pk(DEVICE), command: Command::RecordStart { count_in_ms: 0 } }.encode());
+    let take = take_id(&room(), &pk(DEVICE), &start);
+    d.insert("take", take);
+    let commit =
+        Commit { take, n: 0, phase: phase::OPEN, prev: [0; 32], first: 0, size: 0, root: [0; 32], offset: TAKE_OFFSET, proof: vec![] };
+    dev.raw(&mut out, s, kind::TAKE_COMMIT, Payload::TakeCommit(commit.encode()).encode());
+    d.insert("cap1", cap.caption(&mut out, 2 * s, 2500, origin::HUMAN, None, "Good morning, everyone."));
+    let a0 = asr.caption(&mut out, 3_200_000, 0, origin::MACHINE, m1, "the moon pulls");
+    d.insert("asrA0", a0);
+    asr.annotate(&mut out, 3_200_000, [0; 32], false, "the moon ");
+    let a1 = asr.caption(&mut out, 3_900_000, 0, origin::MACHINE, m1, "the moon pulls the see");
+    d.insert("asrA1", a1);
+    let sup = if defect == StreamDefect::SupersedeUnknown { nothing(6) } else { a0 };
+    asr.annotate(&mut out, 3_900_000, sup, false, "the moon pulls ");
+    let a2 = asr.caption(&mut out, 4_600_000, 2000, origin::MACHINE, m1, "the moon pulls the sea.");
+    d.insert("asrA2", a2);
+    asr.annotate(&mut out, 4_600_000, a1, true, "the moon pulls the sea.");
+    if defect == StreamDefect::ChainBroken {
+        cap.prev = nothing(9);
+    }
+    d.insert("cap2", cap.caption(&mut out, 5 * s, 3000, origin::HUMAN, None, "Today we look at tides."));
+    let before_gap = out.len();
+    let b0 = asr.caption(&mut out, 6_500_000, 0, origin::MACHINE, m1, "high tied");
+    d.insert("asrB0", b0);
+    asr.annotate(&mut out, 6_500_000, [0; 32], false, "high ");
+    let b1 = asr.caption(&mut out, 7_300_000, 2500, origin::MACHINE, m1, "high tide comes twice day.");
+    d.insert("asrB1", b1);
+    asr.annotate(&mut out, 7_300_000, b0, true, "high tide comes twice day.");
+    d.insert("cap3", cap.caption(&mut out, 9 * s, 2000, origin::HUMAN, None, "[Waves crash]"));
+    if defect == StreamDefect::Gap {
+        out.drain(before_gap..before_gap + 2);
+    }
+    (out, d)
+}
+
+/// A session whose machine captions a person reviews before they are final.
+fn reviewed_stream() -> (Vec<Vec<u8>>, Digests) {
+    let mut out = Vec::new();
+    let mut d = Digests::new();
+    let mut asr = Author::new(ASR);
+    let m1 = Some(model(1));
+    let a0 = asr.caption(&mut out, 1_500_000, 0, origin::MACHINE, m1, "welcome to the");
+    d.insert("A0", a0);
+    asr.annotate(&mut out, 1_500_000, [0; 32], false, "welcome ");
+    d.insert("A1", asr.caption(&mut out, 2_400_000, 3000, origin::REVIEWED, m1, "welcome to the reef tour."));
+    asr.annotate(&mut out, 2_400_000, a0, true, "welcome to the reef tour.");
+    d.insert("B0", asr.caption(&mut out, 6_000_000, 2500, origin::REVIEWED, m1, "Corals are animals."));
+    (out, d)
+}
+
+fn body(v: Value) -> Map<String, Value> {
+    v.as_object().expect("a record body is an object").clone()
+}
+
+fn signed(signer: u8, v: Value) -> Value {
+    sign(&key(signer), body(v))
+}
+
+/// A defect of a lesson's records, each the control of one rule.
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+enum Defect {
+    None,
+    LatencyMisstated,
+    DescriptionLate,
+    DescriptionEarly,
+    DescriptionRunsOn,
+    SignUnknownRevision,
+    ClaimMissingTrack,
+    DuplicateMember,
+    NegativeNumber,
+    FlippedSignature,
+    WeakKey,
+    WrongRoom,
+    SecondSources,
+    SourceNotAHead,
+    SourceUnknownTake,
+    ReferenceSpaces,
+    ReferenceUnknownCue,
+    ReferenceMissingCue,
+    QualityWithoutReference,
+    DescriptionOverlap,
+    SigningEmptySegment,
+    ReviewUnknownSigning,
+    ClaimEmptySession,
+    DescriptionUnvoiced,
+    ClaimWrongLanguage,
+    LatencyAboveBound,
+    ReviewNotGiven,
+    ReviewOfAnother,
+    ReviewRejected,
+    CaptionsOfNoOne,
+    SignOffsetAboveBound,
+    /// Only the captioner's quality record and a claim without latency bounds.
+    Unplaced,
+}
+
+/// The lesson's records, with one defect: (records, the index of the description record).
+fn lesson_records(events: &[Vec<u8>], d: &Digests, defect: Defect) -> (Vec<String>, usize) {
+    let r = hex(&room());
+    let mut records: Vec<Value> = Vec::new();
+    let mut texts: Vec<Option<String>> = Vec::new();
+    let push = |records: &mut Vec<Value>, texts: &mut Vec<Option<String>>, v: Value| {
+        records.push(v);
+        texts.push(None);
+    };
+    if defect == Defect::Unplaced {
+        let q = quality(events, &[], CAPTIONER);
+        let claim = signed(
+            AUTHORITY,
+            json!({"kind": kinds::CLAIM, "room": r, "from": 0, "to": 12_000_000, "pt0": PT0_MS, "tracks": [
+                {"service": "captions", "principal": h(&pk(CAPTIONER)), "lang": "en", "latency_mean_max": null, "latency_max": null}]}),
+        );
+        return (vec![text(&q), text(&claim)], usize::MAX);
+    }
+    // 0: the captioner's sources, on the room clock.
+    let src_room = if defect == Defect::WrongRoom { hex(&nothing(1)) } else { r.clone() };
+    let mut cap_sources = json!({"kind": kinds::SOURCES, "room": src_room, "principal": h(&pk(CAPTIONER)), "sources": [
+        {"cue": h(&d["cap1"]), "basis": "room", "take": null, "start": 1_400_000, "end": 1_900_000},
+        {"cue": h(&d["cap2"]), "basis": "room", "take": null, "start": 3_900_000, "end": 4_800_000},
+        {"cue": h(&d["cap3"]), "basis": "room", "take": null, "start": 8_500_000, "end": 8_900_000}]});
+    if defect == Defect::NegativeNumber {
+        cap_sources["sources"][0]["start"] = json!(0);
+    }
+    push(&mut records, &mut texts, signed(ALIGNER, cap_sources));
+    if defect == Defect::NegativeNumber {
+        let t = text(&records[0]).replacen("\"start\":0", "\"start\":-1", 1);
+        texts[0] = Some(t);
+    }
+    // 1: the machine captions' sources, on the take.
+    let base = (-TAKE_OFFSET) as u64;
+    let a_cue = if defect == Defect::SourceNotAHead { d["asrA1"] } else { d["asrA0"] };
+    let take = if defect == Defect::SourceUnknownTake { nothing(2) } else { d["take"] };
+    let asr_sources = json!({"kind": kinds::SOURCES, "room": r, "principal": h(&pk(ASR)), "sources": [
+        {"cue": h(&a_cue), "basis": "take", "take": h(&take), "start": base + 2_400_000, "end": base + 4_400_000},
+        {"cue": h(&d["asrB0"]), "basis": "take", "take": h(&take), "start": base + 5_600_000, "end": base + 7_000_000}]});
+    push(&mut records, &mut texts, signed(ALIGNER, asr_sources.clone()));
+    if defect == Defect::SecondSources {
+        push(&mut records, &mut texts, signed(REVIEWER, asr_sources));
+    }
+    // 2: the reference transcript of the machine captions.
+    let mut entries = vec![
+        json!({"cue": h(&d["asrA0"]), "text": if defect == Defect::ReferenceSpaces { "The moon  pulls the sea." } else { "The moon pulls the sea." }}),
+    ];
+    if defect != Defect::ReferenceMissingCue {
+        entries.push(json!({"cue": h(&d["asrB0"]), "text": "High tide comes twice a day."}));
+    }
+    if defect == Defect::ReferenceUnknownCue {
+        entries.push(json!({"cue": h(&nothing(3)), "text": "Spring tides."}));
+    }
+    push(
+        &mut records,
+        &mut texts,
+        signed(REVIEWER, json!({"kind": kinds::REFERENCE, "room": r, "principal": h(&pk(ASR)), "entries": entries})),
+    );
+    // 3: the description, voiced on a track by a synthesized voice.
+    let mut d1 = json!({"id": "d1", "begin": 10_500, "end": 11_900, "represents": "visual.nonText",
+        "text": "A teacher stands beside a tide chart.", "duck": {"gain": 400, "ramp": 200}, "voice": {"begin": 10_720, "end": 11_690}});
+    match defect {
+        Defect::DescriptionLate => d1["voice"]["begin"] = json!(10_746),
+        Defect::DescriptionEarly => d1["voice"]["begin"] = json!(10_664),
+        Defect::DescriptionRunsOn => d1["voice"]["end"] = json!(11_746),
+        _ => {}
+    }
+    let mut d2 = json!({"id": "d2", "begin": 15_200, "end": 16_000, "represents": "visual.text",
+        "text": "On the board: HIGH TIDE 06:10.", "duck": {"gain": 1000, "ramp": 0}, "voice": {"begin": 15_210, "end": 15_990}});
+    if defect == Defect::DescriptionOverlap {
+        d2["begin"] = json!(11_800);
+        d2["voice"] = Value::Null;
+    }
+    if defect == Defect::DescriptionUnvoiced {
+        d2["voice"] = Value::Null;
+    }
+    let description = signed(
+        DESCRIBER,
+        json!({"kind": kinds::DESCRIPTION, "lang": "en", "script": {"origin": "human", "model": null},
+            "voicing": {"form": "track", "origin": "machine", "model": h(&model(2)), "track": h(&track(1))}, "events": [d1, d2]}),
+    );
+    let description_at = records.len();
+    if defect != Defect::ClaimMissingTrack {
+        push(&mut records, &mut texts, description.clone());
+    }
+    let description_id = record_id(&description);
+    // 4: the signing, motion-captured from a person, bound to the human captions.
+    let mut seg1 = json!({"object": h(&object(1, 1)), "start": 2_600_000, "end": 4_800_000, "revisions": [h(&d["cap1"])]});
+    if defect == Defect::SignUnknownRevision {
+        seg1["revisions"] = json!([h(&nothing(4))]);
+    }
+    if defect == Defect::SigningEmptySegment {
+        seg1["end"] = json!(2_600_000);
+    }
+    let signing_body = json!({"kind": kinds::SIGNING, "room": r, "lang": "bfi", "source": h(&pk(CAPTIONER)), "form": "pose",
+        "track": h(&track(2)), "origin": "human", "model": null, "video": null, "segments": [seg1,
+        {"object": h(&object(1, 2)), "start": 5_700_000, "end": 8_800_000, "revisions": [h(&d["cap2"])]},
+        {"object": h(&object(1, 3)), "start": 9_300_000, "end": 11_000_000, "revisions": [h(&d["cap3"])]}]});
+    let signing = signed(INTERPRETER, signing_body.clone());
+    push(&mut records, &mut texts, signing.clone());
+    let signing_id = record_id(&signing);
+    // 5: the review of the signing.
+    let mut reviewed = signing_id;
+    if defect == Defect::ReviewOfAnother {
+        let mut other = signing_body;
+        other["track"] = h(&track(3));
+        let other = signed(INTERPRETER, other);
+        reviewed = record_id(&other);
+        push(&mut records, &mut texts, other);
+    }
+    if defect == Defect::ReviewUnknownSigning {
+        reviewed = nothing(5);
+    }
+    let (verdict, notes) = if defect == Defect::ReviewRejected { ("rejected", h(&nothing(7))) } else { ("approved", Value::Null) };
+    let review = signed(REVIEWER, json!({"kind": kinds::REVIEW, "signing": h(&reviewed), "scope": "translation", "verdict": verdict, "notes": notes}));
+    let review_at = records.len();
+    if defect != Defect::ReviewNotGiven {
+        push(&mut records, &mut texts, review.clone());
+    }
+    let review_id = record_id(&review);
+    match defect {
+        Defect::DuplicateMember => {
+            let t = text(&review);
+            texts[review_at] = Some(t.replacen("\"verdict\":\"approved\"", "\"verdict\":\"approved\",\"verdict\":\"rejected\"", 1));
+        }
+        Defect::FlippedSignature => {
+            let mut v = review.clone();
+            let mut s = v["sig"].as_str().expect("a signature").to_string();
+            let last = if s.ends_with('0') { "1" } else { "0" };
+            s.replace_range(s.len() - 1.., last);
+            v["sig"] = Value::String(s);
+            texts[review_at] = Some(text(&v));
+        }
+        Defect::WeakKey => {
+            let mut v = review.clone();
+            v["signer_pubkey"] = h(&crate::sig::IDENTITY);
+            texts[review_at] = Some(text(&v));
+        }
+        _ => {}
+    }
+    // 6, 7: the quality records of both caption tracks, computed from what comes before.
+    // A defect the checks before the quality records refuse leaves them unread: they are the
+    // lesson's own then.
+    let so_far: Vec<String> = records.iter().map(text).collect();
+    let (cap_q, mut asr_q) = match super::verify(room(), events, &so_far) {
+        Outcome::Accept(_) => (quality(events, &so_far, CAPTIONER), quality(events, &so_far, ASR)),
+        Outcome::Refuse { .. } => {
+            let base = lesson_records(events, d, Defect::None).0;
+            (read(&base[6]).expect("a record").value, read(&base[7]).expect("a record").value)
+        }
+    };
+    push(&mut records, &mut texts, cap_q);
+    if defect == Defect::LatencyMisstated {
+        asr_q["latency"]["mean"] = json!("850001");
+        asr_q = signed(VENDOR, strip(asr_q));
+    }
+    if defect == Defect::QualityWithoutReference {
+        asr_q["reference"] = Value::Null;
+        asr_q = signed(VENDOR, strip(asr_q));
+    }
+    push(&mut records, &mut texts, asr_q);
+    // 8: the claim.
+    let (from, to) = if defect == Defect::ClaimEmptySession { (12_000_000, 12_000_000) } else { (0, 12_000_000) };
+    let asr_max = if defect == Defect::LatencyAboveBound { json!(850_000) } else { json!(3_000_000) };
+    let cap_principal = if defect == Defect::CaptionsOfNoOne { pk(HOST) } else { pk(CAPTIONER) };
+    let ad_lang = if defect == Defect::ClaimWrongLanguage { "fr" } else { "en" };
+    let offset_max = if defect == Defect::SignOffsetAboveBound { 1_500_000 } else { 4_000_000 };
+    let claim = signed(
+        AUTHORITY,
+        json!({"kind": kinds::CLAIM, "room": r, "from": from, "to": to, "pt0": PT0_MS, "tracks": [
+            {"service": "captions", "principal": h(&cap_principal), "lang": "en", "latency_mean_max": 4_500_000, "latency_max": null},
+            {"service": "captions", "principal": h(&pk(ASR)), "lang": "en", "latency_mean_max": 4_500_000, "latency_max": asr_max},
+            {"service": "audio-description", "record": h(&description_id), "lang": ad_lang},
+            {"service": "sign-language", "record": h(&signing_id), "lang": "bfi", "review": h(&review_id), "offset_max": offset_max}]}),
+    );
+    push(&mut records, &mut texts, claim);
+    let out = records.iter().zip(texts).map(|(v, t)| t.unwrap_or_else(|| text(v))).collect();
+    (out, description_at)
+}
+
+/// A record's body: without `signer_pubkey` and `sig`.
+fn strip(v: Value) -> Value {
+    let mut m = body(v);
+    m.remove("signer_pubkey");
+    m.remove("sig");
+    Value::Object(m)
+}
+
+/// The quality record of `p`'s track, stating the figure this module computes over `events`
+/// and `records`.
+fn quality(events: &[Vec<u8>], records: &[String], p: u8) -> Value {
+    let Outcome::Accept(f) = super::verify(room(), events, records) else { panic!("the records before a quality record verify") };
+    let fig = f["captions"].as_array().expect("figures").iter().find(|x| x["principal"] == h(&pk(p))).expect("a figure").clone();
+    let mut m = body(fig);
+    m.insert("kind".into(), Value::String(kinds::QUALITY.into()));
+    signed(VENDOR, Value::Object(m))
+}
+
+/// A defect of the reviewed session's records.
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum ReviewedDefect {
+    None,
+    SignPartial,
+    LatencyBoundUnmeasured,
+}
+
+/// The reviewed session's records: a description the sink voices, the video of a signer, a
+/// quality record and a claim without latency bounds.
+fn reviewed_records(events: &[Vec<u8>], d: &Digests, defect: ReviewedDefect) -> Vec<String> {
+    let r = hex(&room());
+    let description = signed(
+        DESCRIBER,
+        json!({"kind": kinds::DESCRIPTION, "lang": "en", "script": {"origin": "machine", "model": h(&model(3))},
+            "voicing": {"form": "sink", "origin": "machine-reviewed", "model": h(&model(4)), "track": null}, "events": [
+            {"id": "r1", "begin": 11_000, "end": 12_200, "represents": "visual.nonText", "text": "Divers swim over a reef.",
+             "duck": {"gain": 500, "ramp": 150}, "voice": null},
+            {"id": "r2", "begin": 14_000, "end": 15_000, "represents": "visual.text.title", "text": "Title:\nReef Tour & Co.",
+             "duck": {"gain": 1000, "ramp": 0}, "voice": null}]}),
+    );
+    let first = if defect == ReviewedDefect::SignPartial { d["A0"] } else { d["A1"] };
+    let signing = signed(
+        INTERPRETER,
+        json!({"kind": kinds::SIGNING, "room": r, "lang": "ase", "source": h(&pk(ASR)), "form": "video", "track": h(&track(4)),
+            "origin": "machine", "model": h(&model(5)), "video": {"width": 640, "height": 360, "rate_num": 25, "rate_den": 1},
+            "segments": [
+                {"object": h(&object(2, 1)), "start": 3_000_000, "end": 5_000_000, "revisions": [h(&first)]},
+                {"object": h(&object(2, 2)), "start": 6_500_000, "end": 8_200_000, "revisions": [h(&d["B0"])]}]}),
+    );
+    let mut records = vec![text(&description), text(&signing)];
+    let q = quality(events, &[], ASR);
+    records.push(text(&q));
+    let bound = if defect == ReviewedDefect::LatencyBoundUnmeasured { json!(4_500_000) } else { Value::Null };
+    let claim = signed(
+        AUTHORITY,
+        json!({"kind": kinds::CLAIM, "room": r, "from": 0, "to": 10_000_000, "pt0": PT0_MS, "tracks": [
+            {"service": "captions", "principal": h(&pk(ASR)), "lang": "en", "latency_mean_max": bound, "latency_max": null},
+            {"service": "audio-description", "record": h(&record_id(&description)), "lang": "en"},
+            {"service": "sign-language", "record": h(&record_id(&signing)), "lang": "ase", "review": null, "offset_max": null}]}),
+    );
+    records.push(text(&claim));
+    records
+}
+
+struct Vector {
+    name: &'static str,
+    note: &'static str,
+    stream: &'static str,
+    records: Vec<String>,
+    /// The reason it is written to be refused with, or `None` for accept.
+    want: Option<&'static str>,
+}
+
+fn vectors(streams: &BTreeMap<&'static str, (Vec<Vec<u8>>, Digests)>) -> (Vec<Vector>, usize, usize) {
+    let lesson = &streams["lesson"];
+    let reviewed = &streams["reviewed"];
+    let mut out = Vec::new();
+    let (lesson_records_base, lesson_desc) = lesson_records(&lesson.0, &lesson.1, Defect::None);
+    out.push(Vector {
+        name: "lesson",
+        note: "a human captioner, machine captions revised to final and placed by a take, a reference transcript, a quality record for each track, a description voiced on a track by a synthesized voice, a motion-captured signer bound to the human captions with an approved review, and a claim held to the 2024 statement's mean",
+        stream: "lesson",
+        records: lesson_records_base,
+        want: None,
+    });
+    out.push(Vector {
+        name: "reviewed",
+        note: "machine captions a person reviews before they are final, a description the sink voices with a pinned model, the video of a generated signer, and a claim without latency bounds",
+        stream: "reviewed",
+        records: reviewed_records(&reviewed.0, &reviewed.1, ReviewedDefect::None),
+        want: None,
+    });
+    out.push(Vector {
+        name: "unplaced",
+        note: "no sources: the latency's class is none, and a claim with no latency bound holds",
+        stream: "lesson",
+        records: lesson_records(&lesson.0, &lesson.1, Defect::Unplaced).0,
+        want: None,
+    });
+    let negatives: [(&'static str, &'static str, Defect, &'static str); 30] = [
+        ("latency_misstated", "the machine captions' quality record states a mean latency one microsecond above the recomputed one", Defect::LatencyMisstated, "figure_mismatch"),
+        ("description_late", "a description's voice starts 46 ms after the programme audio has fallen", Defect::DescriptionLate, "description_out_of_sync"),
+        ("description_early", "a description's voice starts 36 ms before the programme audio has fallen", Defect::DescriptionEarly, "description_out_of_sync"),
+        ("description_runs_on", "a description's voice ends 46 ms after the programme audio has risen", Defect::DescriptionRunsOn, "description_out_of_sync"),
+        ("sign_unknown_revision", "the signing names a caption revision the stream does not hold", Defect::SignUnknownRevision, "sign_revision_unknown"),
+        ("claim_missing_track", "the claim declares a description the verifier does not hold", Defect::ClaimMissingTrack, "track_missing"),
+        ("duplicate_member", "the review names its verdict twice", Defect::DuplicateMember, "record_malformed"),
+        ("negative_number", "a source's start is a negative number", Defect::NegativeNumber, "record_malformed"),
+        ("flipped_signature", "a bit of the review's signature is flipped", Defect::FlippedSignature, "bad_signature"),
+        ("weak_key", "the review's key is the identity point", Defect::WeakKey, "bad_key"),
+        ("wrong_room", "the captioner's sources name another room", Defect::WrongRoom, "wrong_room"),
+        ("second_sources", "a second sources record for the machine captions", Defect::SecondSources, "record_conflict"),
+        ("source_not_a_head", "a source names a later revision, not a cue's first", Defect::SourceNotAHead, "source_unknown"),
+        ("source_unknown_take", "a source names a take with no opening commitment", Defect::SourceUnknownTake, "source_take_unknown"),
+        ("reference_spaces", "a reference text holds two spaces in a row", Defect::ReferenceSpaces, "text_not_in_subset"),
+        ("reference_unknown_cue", "the reference names a cue the stream does not hold", Defect::ReferenceUnknownCue, "reference_unknown"),
+        ("reference_missing_cue", "the reference leaves a cue out", Defect::ReferenceMissingCue, "reference_incomplete"),
+        ("quality_without_reference", "the quality record names no reference while the track has one", Defect::QualityWithoutReference, "figure_inputs_mismatch"),
+        ("description_overlap", "a description begins before the one before it ends", Defect::DescriptionOverlap, "description_malformed"),
+        ("signing_empty_segment", "a signing segment ends where it starts", Defect::SigningEmptySegment, "signing_malformed"),
+        ("review_unknown_signing", "the review names a signing record the verifier does not hold", Defect::ReviewUnknownSigning, "review_subject_unknown"),
+        ("claim_empty_session", "the claim's session ends where it starts", Defect::ClaimEmptySession, "claim_malformed"),
+        ("description_unvoiced", "a description on a voicing track has an event the track does not voice", Defect::DescriptionUnvoiced, "track_incomplete"),
+        ("claim_wrong_language", "the claim declares the description in another language", Defect::ClaimWrongLanguage, "track_mismatch"),
+        ("latency_above_bound", "the claim holds the machine captions to a latency of at most 850 ms; one cue's is 900 ms", Defect::LatencyAboveBound, "out_of_sync"),
+        ("review_not_given", "the claim names a review the verifier does not hold", Defect::ReviewNotGiven, "review_missing"),
+        ("review_of_another", "the claim's review approves another signing record", Defect::ReviewOfAnother, "review_mismatch"),
+        ("review_rejected", "the claim's review rejects the signing", Defect::ReviewRejected, "review_rejected"),
+        ("captions_of_no_one", "the claim declares captions by a principal with none", Defect::CaptionsOfNoOne, "track_missing"),
+        ("sign_offset_above_bound", "the claim holds the signing to 1.5 s behind the speech; one segment is 1.8 s behind", Defect::SignOffsetAboveBound, "out_of_sync"),
+    ];
+    for (name, note, defect, want) in negatives {
+        out.push(Vector { name, note, stream: "lesson", records: lesson_records(&lesson.0, &lesson.1, defect).0, want: Some(want) });
+    }
+    let base = lesson_records(&lesson.0, &lesson.1, Defect::None).0;
+    out.push(Vector { name: "chain_broken", note: "the captioner's second caption names a prev that is not its first's", stream: "chain_broken", records: base.clone(), want: Some("chain_broken") });
+    out.push(Vector { name: "supersede_unknown", note: "a machine revision supersedes a revision no one wrote", stream: "supersede_unknown", records: base.clone(), want: Some("supersede_unknown") });
+    out.push(Vector { name: "undelivered_revisions", note: "the machine captions' second cue's partial and its annotation are not delivered, so the track is not whole", stream: "gap", records: base, want: Some("stream_incomplete") });
+    out.push(Vector { name: "sign_partial", note: "the signing is bound to a partial a later revision superseded", stream: "reviewed", records: reviewed_records(&reviewed.0, &reviewed.1, ReviewedDefect::SignPartial), want: Some("sign_revision_not_final") });
+    out.push(Vector { name: "latency_unmeasured", note: "the claim bounds the latency of captions no sources record places", stream: "reviewed", records: reviewed_records(&reviewed.0, &reviewed.1, ReviewedDefect::LatencyBoundUnmeasured), want: Some("sync_unmeasured") });
+    (out, lesson_desc, 0)
+}
+
+fn streams() -> BTreeMap<&'static str, (Vec<Vec<u8>>, Digests)> {
+    let mut m = BTreeMap::new();
+    m.insert("lesson", lesson_stream(StreamDefect::None));
+    m.insert("reviewed", reviewed_stream());
+    m.insert("chain_broken", lesson_stream(StreamDefect::ChainBroken));
+    m.insert("supersede_unknown", lesson_stream(StreamDefect::SupersedeUnknown));
+    m.insert("gap", lesson_stream(StreamDefect::Gap));
+    m
+}
+
+fn outcome_json(o: &Outcome) -> Value {
+    match o {
+        Outcome::Accept(f) => json!({"outcome": "accept", "figures": f}),
+        Outcome::Refuse { at, index, reason } => json!({"outcome": "refuse", "at": at, "index": index, "reason": reason}),
+    }
+}
+
+/// The corpus files, as (path relative to the corpus directory, contents), in order;
+/// `vectors.json` first.
+pub fn generate() -> Vec<(String, String)> {
+    let streams = streams();
+    let (vectors, lesson_desc, reviewed_desc) = vectors(&streams);
+    let mut files: Vec<(String, String)> = Vec::new();
+    let mut seen = BTreeSet::new();
+    let mut vs = Vec::new();
+    for v in &vectors {
+        let o = super::verify(room(), &streams[v.stream].0, &v.records);
+        match (&o, v.want) {
+            (Outcome::Accept(_), None) => {}
+            (Outcome::Refuse { reason, .. }, Some(w)) if *reason == w => {
+                seen.insert(w);
+            }
+            _ => panic!("{}: written to be {:?}, this module gives {o:?}", v.name, v.want),
+        }
+        let mut j = json!({"name": v.name, "note": v.note, "stream": v.stream, "records": v.records});
+        for (k, x) in body(outcome_json(&o)) {
+            j[k] = x;
+        }
+        vs.push(j);
+    }
+    let mut documents = Vec::new();
+    for (name, at, params) in [("lesson", lesson_desc, Some((VOICING_URI, VOICING_TYPE))), ("reviewed", reviewed_desc, None)] {
+        let v = vectors.iter().find(|v| v.name == name).expect("an accepted vector");
+        let r = read(&v.records[at]).expect("a description record");
+        let (uri, ty) = params.unwrap_or(("", ""));
+        let doc = dapt(&r.value, uri, ty).expect("a DAPT document");
+        let file = format!("{name}.dapt.ttml");
+        let (uri, ty) = match params {
+            Some((u, t)) => (json!(u), json!(t)),
+            None => (Value::Null, Value::Null),
+        };
+        documents.push(json!({"vector": name, "record": at, "uri": uri, "type": ty, "file": file}));
+        files.push((file, doc));
+    }
+    for (uri, ty) in [("https://media.example/a\"b", VOICING_TYPE), (VOICING_URI, "")] {
+        let v = &vectors[0];
+        let r = read(&v.records[lesson_desc]).expect("a description record");
+        let reason = dapt(&r.value, uri, ty).expect_err("a parameter refused").code();
+        seen.insert(reason);
+        documents.push(json!({"vector": "lesson", "record": lesson_desc, "uri": uri, "type": ty, "reason": reason}));
+    }
+    for r in Reason::ALL {
+        assert!(seen.contains(r.code()), "no vector is refused {}", r.code());
+    }
+    let doc = json!({
+        "corpus": "wai.access.services",
+        "extension": "extensions/access-services.md",
+        "room": hex(&room()),
+        "pt0_ms": PT0_MS,
+        "principals": NAMES.iter().map(|(n, i)| (n.to_string(), json!(hex(&pk(*i))))).collect::<Map<String, Value>>(),
+        "streams": streams.iter().map(|(n, (e, _))| (n.to_string(), json!(e.iter().map(|b| hex(b)).collect::<Vec<_>>()))).collect::<Map<String, Value>>(),
+        "vectors": vs,
+        "documents": documents,
+    });
+    let mut out = vec![("vectors.json".to_string(), serde_json::to_string_pretty(&doc).expect("the corpus serialises") + "\n")];
+    out.extend(files);
+    let fails = verify_files(&out.iter().cloned().collect());
+    assert!(fails.is_empty(), "the generated corpus does not verify:\n{}", fails.join("\n"));
+    out
+}
+
+fn unhex_bytes(s: &str) -> Option<Vec<u8>> {
+    if !s.len().is_multiple_of(2) {
+        return None;
+    }
+    (0..s.len()).step_by(2).map(|i| u8::from_str_radix(s.get(i..i + 2)?, 16).ok()).collect()
+}
+
+/// Check a corpus directory's files (name → contents) against this module: every vector's
+/// outcome, place, reason and figures, and every DAPT document. Returns the failures.
+pub fn verify_files(files: &BTreeMap<String, String>) -> Vec<String> {
+    let mut fails = Vec::new();
+    let Some(doc) = files.get("vectors.json") else { return vec!["no vectors.json".into()] };
+    let root: Value = match serde_json::from_str(doc) {
+        Ok(v) => v,
+        Err(e) => return vec![format!("vectors.json does not parse: {e}")],
+    };
+    let room_id = unhex::<32>(root["room"].as_str().unwrap_or("")).unwrap_or([0; 32]);
+    let mut streams: BTreeMap<String, Vec<Vec<u8>>> = BTreeMap::new();
+    for (n, e) in root["streams"].as_object().into_iter().flatten() {
+        let evs: Option<Vec<Vec<u8>>> = e.as_array().into_iter().flatten().map(|x| x.as_str().and_then(unhex_bytes)).collect();
+        match evs {
+            Some(evs) => {
+                streams.insert(n.clone(), evs);
+            }
+            None => fails.push(format!("stream {n} does not read")),
+        }
+    }
+    let mut records_of: BTreeMap<String, Vec<String>> = BTreeMap::new();
+    for v in root["vectors"].as_array().into_iter().flatten() {
+        let name = v["name"].as_str().unwrap_or("?").to_string();
+        let Some(events) = v["stream"].as_str().and_then(|s| streams.get(s)) else {
+            fails.push(format!("{name}: names no stream the corpus holds"));
+            continue;
+        };
+        let records: Vec<String> = v["records"].as_array().into_iter().flatten().filter_map(|r| r.as_str().map(String::from)).collect();
+        let got = outcome_json(&super::verify(room_id, events, &records));
+        for k in ["outcome", "at", "index", "reason", "figures"] {
+            let (g, w) = (got.get(k).unwrap_or(&Value::Null), v.get(k).unwrap_or(&Value::Null));
+            if g != w {
+                fails.push(format!("{name}: {k}: {w} is stated, this module gives {g}"));
+            }
+        }
+        records_of.insert(name, records);
+    }
+    for d in root["documents"].as_array().into_iter().flatten() {
+        let vname = d["vector"].as_str().unwrap_or("?");
+        let at = d["record"].as_u64().unwrap_or(u64::MAX) as usize;
+        let Some(text) = records_of.get(vname).and_then(|r| r.get(at)) else {
+            fails.push(format!("document of {vname}: names no record"));
+            continue;
+        };
+        let rec = match read(text) {
+            Ok(r) if r.kind == kinds::DESCRIPTION => r,
+            _ => {
+                fails.push(format!("document of {vname}: record {at} is not a description"));
+                continue;
+            }
+        };
+        let got = dapt(&rec.value, d["uri"].as_str().unwrap_or(""), d["type"].as_str().unwrap_or(""));
+        match (got, d["file"].as_str(), d["reason"].as_str()) {
+            (Ok(doc), Some(f), None) => {
+                if files.get(f) != Some(&doc) {
+                    fails.push(format!("document of {vname}: {f} differs from this module's"));
+                }
+            }
+            (Err(e), None, Some(r)) if e.code() == r => {}
+            (g, f, r) => fails.push(format!("document of {vname}: the corpus states {f:?} / {r:?}, this module gives {:?}", g.map(|_| "a document"))),
+        }
+    }
+    fails
+}
+
+/// The corpus check of a directory's files: [`verify_files`].
+pub fn verify(files: &BTreeMap<String, String>) -> Vec<String> {
+    verify_files(files)
+}
diff --git a/wai/wai-rs/src/bin/wai_access_services_vectors.rs b/wai/wai-rs/src/bin/wai_access_services_vectors.rs
new file mode 100644
index 000000000..d20545da9
--- /dev/null
+++ b/wai/wai-rs/src/bin/wai_access_services_vectors.rs
@@ -0,0 +1,75 @@
+//! Conformance corpus for access services (`live-conformance/access/`, extensions/access-services.md §11).
+//!
+//!   wai_access_services_vectors gen    <corpus-dir>   write vectors.json and every expected output
+//!                                                (.dapt.ttml), from fixed seeds
+//!   wai_access_services_vectors verify <corpus-dir>   every file regenerates byte for byte, no other
+//!                                                file but README.md is there, and every case
+//!                                                gets the outcome it states
+//!
+//! The generator and this verifier are one implementation. The corpus's second
+//! implementation is `live-conformance/access_services_verify.py`, written from the extension's
+//! text and sharing no code with this binary.
+
+use std::collections::BTreeMap;
+use std::path::Path;
+use wai::access_services::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)) => {
+            if let Err(e) = std::fs::create_dir_all(d) {
+                eprintln!("create {d}: {e}");
+                std::process::exit(1);
+            }
+            for (name, body) in corpus::generate() {
+                let p = Path::new(d).join(&name);
+                if let Err(e) = std::fs::write(&p, body) {
+                    eprintln!("write {}: {e}", p.display());
+                    std::process::exit(1);
+                }
+            }
+            println!("wrote {d}");
+        }
+        (Some("verify"), Some(d)) => std::process::exit(verify(Path::new(d))),
+        _ => {
+            eprintln!("usage: wai_access_services_vectors gen|verify <corpus-dir>");
+            std::process::exit(2);
+        }
+    }
+}
+
+fn verify(dir: &Path) -> i32 {
+    let mut files = BTreeMap::new();
+    let entries = match std::fs::read_dir(dir) {
+        Ok(e) => e,
+        Err(e) => {
+            eprintln!("read {}: {e}", dir.display());
+            return 1;
+        }
+    };
+    for e in entries.flatten() {
+        let name = e.file_name().to_string_lossy().into_owned();
+        if name == "README.md" {
+            continue;
+        }
+        match std::fs::read_to_string(e.path()) {
+            Ok(s) => {
+                files.insert(name, s);
+            }
+            Err(err) => {
+                eprintln!("read {name}: {err}");
+                return 1;
+            }
+        }
+    }
+    let generated: BTreeMap<String, String> = corpus::generate().into_iter().collect();
+    let same = files == generated;
+    println!("{} every file regenerates byte for byte from its seeds, and no other file is there", if same { "PASS" } else { "FAIL" });
+    let fails = corpus::verify(&files);
+    for f in &fails {
+        println!("FAIL {f}");
+    }
+    println!("{} every case gets the outcome the corpus states", if fails.is_empty() { "PASS" } else { "FAIL" });
+    (!same || !fails.is_empty()) as i32
+}
diff --git a/wai/wai-rs/src/codecs/registry.rs b/wai/wai-rs/src/codecs/registry.rs
index 8ad7b2440..7f424a7d6 100644
--- a/wai/wai-rs/src/codecs/registry.rs
+++ b/wai/wai-rs/src/codecs/registry.rs
@@ -227,6 +227,7 @@ pub const CAP_MEDIA_SYNTHESIS: &str = "wai.media.synthesis";
 pub const CAP_AI_USAGE: &str = "wai.ai.usage";
 pub const CAP_MEDIA_CONTRIBUTION: &str = "wai.media.contribution";
 pub const CAP_DELIVERY_SETTLEMENT: &str = "wai.delivery.settlement";
+pub const CAP_ACCESS_SERVICES: &str = "wai.access.services";
 
 /// One row per string SPEC §5 registers that is a payload, companion or record:
 /// `(string, SPEC section, edition, registered)`.
@@ -322,6 +323,7 @@ const ROWS: &[(&str, &str, Option<&str>, &str)] = &[
     (CAP_AI_USAGE, S_INTERACTIVE, None, "2026-10-21"),
     (CAP_MEDIA_CONTRIBUTION, S_INTERACTIVE, None, "2026-10-21"),
     (CAP_DELIVERY_SETTLEMENT, S_INTERACTIVE, None, "2026-10-21"),
+    (CAP_ACCESS_SERVICES, S_INTERACTIVE, None, "2026-10-21"),
     (CAP_AUDIO_IAMF, S_IMMERSIVE, None, "2026-06-17"),
     (CAP_AUDIO_AC4, S_IMMERSIVE, None, "2026-06-17"),
     (CAP_AUDIO_IVAS, S_IMMERSIVE, None, "2026-06-17"),
@@ -380,6 +382,7 @@ const RECORDS: &[&str] = &[
     CAP_AI_USAGE,
     CAP_MEDIA_CONTRIBUTION,
     CAP_DELIVERY_SETTLEMENT,
+    CAP_ACCESS_SERVICES,
 ];
 
 /// A named identifier SPEC uses that has the shape of a capability string but is
@@ -542,6 +545,7 @@ const DERIVING_EDGE: &str = "extensions/deriving-edge.md";
 const SYNTHESIS: &str = "extensions/synthesis.md";
 const CONTRIBUTION: &str = "extensions/contribution.md";
 const SETTLEMENT: &str = "extensions/settlement.md";
+const ACCESS_SERVICES: &str = "extensions/access-services.md";
 
 const fn wire(name: &'static str, kind: WireKind, document: &'static str, section: &'static str,
               status: WireStatus) -> WireIdentifier {
@@ -658,6 +662,14 @@ pub const WIRE_IDENTIFIERS: &[WireIdentifier] = &[
     wire("WDA1", WireKind::Magic, SETTLEMENT, "§3.1", WireStatus::Defined),
     wire("WBR1", WireKind::Magic, SETTLEMENT, "§5.2", WireStatus::Defined),
     wire("WSS1", WireKind::Magic, SETTLEMENT, "§7.1", WireStatus::Defined),
+    wire("wai-caption-sources", WireKind::DocumentKind, ACCESS_SERVICES, "§4.2", WireStatus::Defined),
+    wire("wai-caption-reference", WireKind::DocumentKind, ACCESS_SERVICES, "§4.3", WireStatus::Defined),
+    wire("wai-caption-quality", WireKind::DocumentKind, ACCESS_SERVICES, "§4.7", WireStatus::Defined),
+    wire("wai-description", WireKind::DocumentKind, ACCESS_SERVICES, "§5.1", WireStatus::Defined),
+    wire("tag:transaction.science,2026:wai/access", WireKind::Scheme, ACCESS_SERVICES, "§5.5", WireStatus::Defined),
+    wire("wai-signing", WireKind::DocumentKind, ACCESS_SERVICES, "§6.1", WireStatus::Defined),
+    wire("wai-signing-review", WireKind::DocumentKind, ACCESS_SERVICES, "§6.4", WireStatus::Defined),
+    wire("wai-access-completeness", WireKind::DocumentKind, ACCESS_SERVICES, "§7.1", WireStatus::Defined),
 ];
 
 /// A string with the shape of a capability that the reference implementation uses
diff --git a/wai/wai-rs/src/lib.rs b/wai/wai-rs/src/lib.rs
index abc047893..41b0589f1 100644
--- a/wai/wai-rs/src/lib.rs
+++ b/wai/wai-rs/src/lib.rs
@@ -544,6 +544,14 @@ pub mod settlement;
 /// cbindgen:ignore
 #[cfg(feature = "timed_text")]
 pub mod timed_text;
+// Access services (extensions/access-services.md): `wai.access.services` — caption quality
+// (latency, stability, accuracy) recomputed from the signed revisions, audio description with
+// its mixing, voicing and DAPT document, sign language bound to caption revisions by digest,
+// and the completeness claim of a room session. Rust-only, like timed_text: its constants
+// must not become macros in include/wai.h.
+/// cbindgen:ignore
+#[cfg(feature = "access_services")]
+pub mod access_services;
 
 // Typed receipt classes (extensions/jwp-receipts.md §2.4.3–§2.4.12, §2.6, §3.1–§3.2):
 // energy, lawful-basis, log-inclusion, soft-binding, binding-recovery, measurement,
diff --git a/wai/wai-rs/tests/access_services.rs b/wai/wai-rs/tests/access_services.rs
new file mode 100644
index 000000000..a74d7c5af
--- /dev/null
+++ b/wai/wai-rs/tests/access_services.rs
@@ -0,0 +1,69 @@
+//! `wai.access.services` (extensions/access-services.md): the committed corpus
+//! `live-conformance/access/` regenerates byte for byte from its fixed seeds, holds no
+//! other file, every vector and document in it gets the outcome it states, every reason of
+//! §10 refuses a case, and the extension's §10 lists exactly the reasons the reference
+//! reports.
+#![cfg(feature = "access_services")]
+
+use std::collections::{BTreeMap, BTreeSet};
+use std::path::PathBuf;
+use wai::access_services::{corpus, Reason};
+
+fn wai_dir() -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("..")
+}
+
+fn committed() -> BTreeMap<String, String> {
+    let dir = wai_dir().join("live-conformance/access");
+    std::fs::read_dir(&dir)
+        .expect("the committed corpus")
+        .flatten()
+        .map(|e| (e.file_name().to_string_lossy().into_owned(), e.path()))
+        .filter(|(n, _)| n != "README.md")
+        .map(|(n, p)| (n, std::fs::read_to_string(p).expect("a text file")))
+        .collect()
+}
+
+#[test]
+fn the_committed_corpus_regenerates_from_its_seeds() {
+    let files = committed();
+    let generated: BTreeMap<String, String> = corpus::generate().into_iter().collect();
+    let extra: Vec<&String> = files.keys().filter(|k| !generated.contains_key(*k)).collect();
+    let missing: Vec<&String> = generated.keys().filter(|k| !files.contains_key(*k)).collect();
+    let differ: Vec<&String> = generated.iter().filter(|(k, v)| files.get(*k).is_some_and(|f| f != *v)).map(|(k, _)| k).collect();
+    assert!(extra.is_empty() && missing.is_empty() && differ.is_empty(), "extra {extra:?}, missing {missing:?}, differ {differ:?}: run `wai_access_services_vectors gen`");
+}
+
+#[test]
+fn every_case_gets_its_stated_outcome() {
+    let fails = corpus::verify(&committed());
+    assert!(fails.is_empty(), "{}", fails.join("\n"));
+}
+
+/// Every reason of §10 refuses a vector or a document of the committed corpus.
+#[test]
+fn every_reason_refuses_a_case() {
+    let files = committed();
+    let root: serde_json::Value = serde_json::from_str(&files["vectors.json"]).expect("vectors.json");
+    let mut seen = BTreeSet::new();
+    for v in root["vectors"].as_array().into_iter().flatten().chain(root["documents"].as_array().into_iter().flatten()) {
+        if let Some(r) = v["reason"].as_str() {
+            seen.insert(r.to_string());
+        }
+    }
+    for r in Reason::ALL {
+        assert!(seen.contains(r.code()), "no case of the corpus is refused {}", r.code());
+    }
+}
+
+/// §10 of the extension lists exactly the codes `Reason` has, each once, in order.
+#[test]
+fn the_extension_lists_the_reasons() {
+    let text = std::fs::read_to_string(wai_dir().join("extensions/access-services.md")).expect("the extension");
+    let at = text.find("\n## 10. Reasons").expect("a §10");
+    let end = text[at + 1..].find("\n## ").map_or(text.len(), |e| at + 1 + e);
+    let listed: Vec<String> =
+        text[at..end].lines().filter(|l| l.starts_with("| `")).filter_map(|l| l.split('`').nth(1).map(String::from)).collect();
+    let want: Vec<String> = Reason::ALL.iter().map(|r| r.code().to_string()).collect();
+    assert_eq!(listed, want, "§10's table and Reason::ALL differ");
+}