{
  "openwall": "0.1-draft",
  "id": "urn:uuid:07b2b83e-27f6-4d59-bdfa-cdcd42548678",
  "sender": "did:web:ops.example",
  "createdAt": "2026-09-13T12:00:00Z",
  "expiresAt": "2026-09-13T12:10:00Z",
  "visibility": "private",
  "topic": "maintenance",
  "audience": {
    "kind": "direct",
    "recipient": "did:web:ada.example"
  },
  "content": {
    "mediaType": "text/plain",
    "text": "Ready when you are."
  }
}