{
  "request": {
    "program": "#! title A chain with one end held\n#! about Variable 0 is held at +. Each link passes the sign along, or flips it. With one end held, the deterministic mode has one answer, and it gets there in a few sweeps.\n#! expect works\n#! check matches +++--++-\nvars 8\npin 0 +\nagree 0 1\nagree 1 2\noppose 2 3\nagree 3 4\noppose 4 5\nagree 5 6\noppose 6 7\nminimize\n"
  },
  "result": {
    "protocol": "wai.quantum.landscape/1",
    "label": "A classical emulator of the settling model of a planned energy-based processor, running on your machine. Energies are computed exactly. The joule line is this run's operation count priced at rates measured on an FPGA, with a published figure for one integer add beside it for scale. No photonic hardware, custom chip or quantum effect is involved in this run.",
    "member": {
      "id": "fpga:board-1",
      "class": "fpga",
      "kernel": "wai.quantum.landscape/settle",
      "parity": "statistical",
      "capacity": {
        "cells": 64
      }
    },
    "program_digest": "e4849d4d4d1c0243d3e1cde312127be19f0601c1937d7a373b5ebc8872b202ab",
    "title": "A chain with one end held",
    "about": "Variable 0 is held at +. Each link passes the sign along, or flips it. With one end held, the deterministic mode has one answer, and it gets there in a few sweeps.",
    "item": null,
    "expect": "works",
    "variables": 8,
    "pairs": 7,
    "seed": "1",
    "mode": "settle",
    "mode_words": "Deterministic (temperature 0): every variable starts at 0, then settles, for at most 60 sweeps.",
    "temperature": 0.0,
    "temperature_from": null,
    "restarts": 1,
    "sweeps": 60,
    "state": "+++--++-",
    "groups": [],
    "energy": -10,
    "truth": {
      "arrangements": 6561,
      "lowest": -10.0,
      "at_lowest": 1,
      "at_lowest_passing": 1,
      "example": "+++--++-"
    },
    "reached": true,
    "declared": null,
    "warnings": [],
    "checks": [
      {
        "kind": "matches",
        "passed": true,
        "detail": "This matches the planted answer."
      }
    ],
    "verdict": "solved",
    "summary": "It reached energy -10. That is the lowest possible: all 6,561 arrangements were checked, and only this arrangement has it.",
    "work": {
      "sweeps": 9,
      "accumulates": 126,
      "cell_updates": 72,
      "draws": 0,
      "ended": "came to rest",
      "rests": true
    },
    "joules": {
      "kind": "priced",
      "class": "ModelBased",
      "describes": "the work on one FPGA board, not the machine that ran this job",
      "line": "Priced, not read from a meter: 126 accumulates × about 0.16 pJ = about 20 pJ.",
      "rate_pj_per_accumulate": 0.16,
      "rate_source": "Deterministic rate: measured on one FPGA board, on a dense 64-cell test design at 100 MHz, as the slope of power against clock speed. A second method on the same board agrees. No other board has repeated it.",
      "pj": 20.16,
      "published_add": {
        "class": "Estimator",
        "rate_pj_per_accumulate": 0.03,
        "source": "a published 2014 figure for the energy of one 8-bit integer add in 45 nm logic",
        "pj": 3.78,
        "line": "For scale: a published 2014 figure for one 8-bit integer add, about 0.03 pJ, puts this count at about 3.8 pJ. It is a reference point, not a model of any processor."
      },
      "left_out": {
        "board_watts": 3.1,
        "board_hz": 100000000.0,
        "clocks_at_least": 9,
        "pj": 279000.0,
        "line": "Small jobs price low. These rates count only the work: that board also draws about 3.1 W at every clock. This run's 9 sweeps need at least 9 clocks, which is about 280 nJ of board power that the line above leaves out."
      },
      "metered": null
    },
    "state_hash": "3be907bec759c3d7",
    "replay": "aa1a20cdf831dc2facfe3964bae8d25d29c16d338b9c0f79e4c5f7f152ef254d",
    "engine": {
      "name": "wai-quantum",
      "version": "0.9.0"
    },
    "schema": "wai.quantum.landscape/1",
    "receipt": {
      "alg": "ed25519",
      "canon": "rfc8785",
      "key": "197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61",
      "digest": "a55b1a7f84452e7b36668a7193591c2fe22f9abcc18dcef2561702e68d6ac597",
      "signature": "0a4f0516b254f5c54561b59c5540c09061351bdd282a3356bdaad99a73c36f0af7ad4e4276f97536cfa57b1fe401ef6ed99a351456f62795cfb76b5dca6b4d08"
    }
  }
}