{
  "_comment": "CPS-0001 Test Vector — V₅ FAIL: payloadDigest does not match payload",
  "protocolVersion": "1.0",
  "assertions": {
    "observationOccurred": { "value": true, "confidence": 0.95 },
    "continuityMaintained": { "value": true, "confidence": 0.85 },
    "receiptIntegrity": { "value": true, "confidence": 1.0 }
  },
  "evidence": [
    {
      "engineId": "com.example.simulation",
      "engineVersion": "1.0.0",
      "confidence": 0.85,
      "payload": { "score": 0.85 },
      "payloadDigest": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
    }
  ],
  "receiptId": "0193a62e-7b11-74a8-9c3d-f1e2a3b4c5d6",
  "interval": {
    "start": "2099-07-22T10:00:00.000Z",
    "end": "2099-07-22T10:00:08.000Z",
    "coverageMs": 8000
  },
  "subject": { "id": "sha256:tampered", "type": "embodied" },
  "expiresAt": "2099-07-22T10:05:08.000Z",
  "previousReceiptHash": null,
  "references": [],
  "verdict": "PASS",
  "issuer": {
    "id": "sha256:issuer001",
    "publicKey": "MCowBQYDK2VwAyEAabc123def456ghi789jkl012mno345pqr678stu901vwx234yz"
  },
  "signature": {
    "algorithm": "Ed25519",
    "value": "iGy9Pq3KlxAbCdEfGhIjKlMnOpQrStUvWxYz0123456789AbCdEfGhIjKlMnOpQr",
    "signedAt": "2099-07-22T10:00:08.000Z"
  }
}