Chain of custody for every agent action.

{
  "tenant_id": "griff-ai-public",
  "seq": 1,
  "previous_hash": "0000000000000000000000000000000000000000000000000000000000000000",
  "ts": "2026-05-06T16:00:01.200Z",
  "event": "task.contract.accepted",
  "source": "master-atc-public-demo",
  "payload": {
    "goal": "Public evaluator submits a read-only MASTER ATC demo mission.",
    "agents": [
      "Buyer operator",
      "MASTER ATC public simulator"
    ],
    "evidence_package": {
      "task_id": "public-demo-task-001",
      "attempt_id": "public-demo-attempt-001",
      "artifact_ids": [
        "demo://contract/public-demo-task-001"
      ],
      "acceptance_mapping": [
        {
          "criterion": "Mission is scoped to public demo resources only",
          "satisfied": true,
          "evidence": "allowed_actions=read_demo_fixture,simulate_runner_log,write_evidence_pack,verify_hash_chain"
        },
        {
          "criterion": "Forbidden actions are declared before execution",
          "satisfied": true,
          "evidence": "read_secret,write_customer_data,execute_shell,delete_resource,charge_billing denied"
        }
      ],
      "policy_clearance": {
        "forbidden_files_touched": false,
        "forbidden_commands_run": false,
        "budget_exceeded": false
      },
      "evidence_quality_score": 0.9
    },
    "judge_decision": {
      "decision": "allow",
      "confidence": 0.9,
      "hard_gates": {
        "tests_passed": true,
        "security_clear": true,
        "policy_clear": true,
        "evidence_complete": true,
        "budget_ok": true,
        "lease_valid": true
      },
      "votes": {
        "policy": "allow",
        "custody": "allow",
        "export": "allow"
      },
      "reason": "The task contract is read-only and safe for the public demo lane."
    },
    "cost_usd": 0,
    "runtime_seconds": 1.2
  },
  "hash": "70d5c97505dcca511e4261a08e4a15b3db1586e2e86b38a6450cdd5c8b27a41a"
}