{
  "schema": "hummbl.verify_receipt.fixture.v0",
  "note": "Fixture-only HMAC chain. Secret is not the live probe worker key.",
  "fixture_secret_env": "RECEIPTENGINE_HMAC_KEY",
  "fixture_secret_value": "fixture-demo-hmac-key-not-the-probe-secret",
  "receipts": [
    {
      "receipt_id": "r-fixture00001",
      "agent_id": "fixture-agent",
      "sequence_id": 0,
      "prev_receipt_hash": "",
      "timestamp": "2026-09-09T12:00:00Z",
      "action_type": "fixture.action",
      "payload": {
        "n": 1,
        "note": "demo"
      },
      "law_checks": [],
      "violations": [],
      "evidence_grade": "PUBLIC_PROBE",
      "signature": "ae39c1eee6389cacd0a6e6de8a1e247ddc96704c2eec2b83aebb00f1c35b7f57"
    },
    {
      "receipt_id": "r-fixture00002",
      "agent_id": "fixture-agent",
      "sequence_id": 1,
      "prev_receipt_hash": "37f8bdf33a7f465ad880e77fac5ae01975d3c9471963030aad38b19e6f388755",
      "timestamp": "2026-09-09T12:00:01Z",
      "action_type": "fixture.action",
      "payload": {
        "n": 2,
        "note": "demo"
      },
      "law_checks": [],
      "violations": [],
      "evidence_grade": "PUBLIC_PROBE",
      "signature": "79a4c2f1d59f7843a615e1351000cf1bfd66bdd8cc7de59a10f19bffd3853c42"
    }
  ]
}