{
  "schemaVersion": 1,
  "contract": "buildchain-v4-canonical-contract-fixtures",
  "canonicalization": "buildchain-canonical-json/v1",
  "rootConstruction": "sha256(domain + NUL + canonical-bytes)",
  "validCases": [
    {
      "id": "ascii-key-order",
      "domain": "queue-state",
      "clock": "2026-08-07T15:00:00.000Z",
      "value": { "z": 1, "a": 2, "A": [true, null] },
      "expectedCanonicalUtf8": "{\"A\":[true,null],\"a\":2,\"z\":1}\n",
      "expectedRoot": "sha256:55693e621e85b454876b11af9842c106ab7eb7ab92c6ca5ea7fa498ea6cf74f4"
    },
    {
      "id": "utf8-string-and-escapes",
      "domain": "observation",
      "clock": "2024-02-29T23:59:59.999Z",
      "value": { "line": "一行\\n二行", "quote": "\\\"", "slash": "/" },
      "expectedCanonicalUtf8": "{\"line\":\"一行\\\\n二行\",\"quote\":\"\\\\\\\"\",\"slash\":\"/\"}\n",
      "expectedRoot": "sha256:54a49dcafaac0e3e480c9fb63ff50a976490a5cf467cb2c34fb0ec02e2d16afd"
    },
    {
      "id": "safe-integer-boundaries",
      "domain": "transition-receipt",
      "clock": "2000-02-29T00:00:00.000Z",
      "value": { "maximum": 9007199254740991, "minimum": -9007199254740991 },
      "expectedCanonicalUtf8": "{\"maximum\":9007199254740991,\"minimum\":-9007199254740991}\n",
      "expectedRoot": "sha256:52f61241c03d451b7568a704c502eac50e12ef53717ee49f4a89109e65bc6b8c"
    }
  ],
  "invalidCases": [
    {
      "id": "fractional-number",
      "kind": "canonical",
      "value": 1.5,
      "fault": "unsupported-number"
    },
    {
      "id": "unsafe-integer",
      "kind": "canonical",
      "value": 9007199254740992,
      "fault": "unsupported-number"
    },
    {
      "id": "non-ascii-key",
      "kind": "canonical",
      "value": { "键": 1 },
      "fault": "unsupported-object-key"
    },
    {
      "id": "bad-clock-offset",
      "kind": "clock",
      "value": "2026-08-07T23:00:00.000+08:00",
      "fault": "invalid-clock"
    },
    {
      "id": "bad-clock-date",
      "kind": "clock",
      "value": "2026-02-30T00:00:00.000Z",
      "fault": "invalid-clock"
    },
    {
      "id": "bad-clock-year-zero",
      "kind": "clock",
      "value": "0000-01-01T00:00:00.000Z",
      "fault": "invalid-clock"
    },
    {
      "id": "unknown-domain",
      "kind": "root",
      "value": "provider-state",
      "fault": "unsupported-root-domain"
    },
    {
      "id": "event-extra-key",
      "kind": "event",
      "value": {
        "schema": "buildchain-v4-event-envelope/v1",
        "eventId": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
        "eventType": "candidate-submitted",
        "occurredAt": "2026-08-07T15:00:00.000Z",
        "subjectRoot": "sha256:2222222222222222222222222222222222222222222222222222222222222222",
        "payload": {},
        "sampledNow": "2026-08-07T15:00:00.000Z"
      },
      "fault": "invalid-envelope-shape"
    },
    {
      "id": "receipt-fault-outcome-drift",
      "kind": "receipt",
      "value": {
        "schema": "buildchain-v4-receipt-envelope/v1",
        "receiptType": "candidate-submitted",
        "recordedAt": "2026-08-07T15:00:00.000Z",
        "eventRoot": "sha256:3333333333333333333333333333333333333333333333333333333333333333",
        "priorStateRoot": null,
        "nextStateRoot": null,
        "outcome": "rejected",
        "fault": null
      },
      "fault": "invalid-receipt"
    }
  ]
}