{
  "schema_version": "if.blackboard.governance_event.v1",
  "event_id": "evt_demo_001",
  "tenant_id": "ten_demo",
  "workspace_id": "ws_demo",
  "project_id": "proj_demo",
  "task_id": "task_demo",
  "session_id": "sess_demo",
  "agent_id": "agent_demo",
  "principal_id": "user_demo",
  "event_type": "checkpoint.written",
  "source_harness": "rook",
  "transport_class": "https_api",
  "transport_attestation": {
    "origin_class": "managed_edge",
    "attested_by": "transport_attestation_demo",
    "observed_at": "2026-06-27T22:00:00Z",
    "client_ip_hash": "8bfb5c96b692f6f2529e81fe4be00f60bb2b4fa80ed3e0aef04796121ca81fef",
    "user_agent_hash": "9efe57a66cf451ced0aee2e345cbf130b5dbe3696cedfb0b0b8310262744f957",
    "client_app": "blackboard-cli"
  },
  "payload": {
    "summary": "demo checkpoint"
  },
  "evidence_refs": [
    {
      "artifact_id": "art_demo",
      "uri": "s3://demo/artifact.txt",
      "evidence_type": "artifact",
      "sha256": "7b19e3fdace6439a93e675dbf9c7720c3037c7b364a73c5334305669371e854f",
      "confidence": "verified",
      "redaction": "none",
      "content_trust": "sanitized_projection",
      "captured_at": "2026-06-27T22:00:00Z",
      "source": "demo"
    }
  ],
  "policy_hash": "sha256:05617961b63e1ebe13bf4b01446779bbddad236d16a87bd9a386b0908e44dfea",
  "redaction_policy_id": "redact_v1",
  "idempotency_key": "idem-demo-0000001",
  "prev_hash": null,
  "event_hash": "sha256:be8b809e05b29d140d47dfca0819d8b8eb11cfaf8cc860aae9015b40e4c84d68",
  "integrity": {
    "integrity_class": "signed",
    "payload_sha256": "sha256:31812f3a86441b16275e814dbb49fea838809540326a0c53fcc8b6e6eeee8e20",
    "canonicalization": "json-c14n-v1",
    "key_id": "kid_demo",
    "signature": {
      "alg": "ed25519",
      "value": "base64signaturevalue"
    }
  },
  "created_at": "2026-06-27T22:00:00Z"
}