{
  "profile": "sidecat.system/0.1",
  "kind": "event",
  "source": {
    "app": "https://example.invalid/sidecat/apps/contacts",
    "interface": "https://example.invalid/sidecat/interfaces/contacts/v1",
    "owner": "urn:sidecat:owner:89f93660-f35e-4efe-92f2-aa98119b0a09"
  },
  "event": "changed",
  "delivery": "retained",
  "eventID": "ev-18",
  "ownerOrder": "18",
  "eventVersion": 1,
  "schemaDigest": "8d1437ecbcda71c9fbcf8ffe88ce453a7b7b2aceb27193e9d0a110926030ab9d",
  "causeID": "01JZ6C0A9M57V1PZCQR8YB5K2D",
  "payload": {
    "ref": {
      "$sidecat": "object-ref",
      "owner": "urn:sidecat:owner:89f93660-f35e-4efe-92f2-aa98119b0a09",
      "type": "https://example.invalid/sidecat/types/contact/v1",
      "key": "c-123"
    },
    "version": "v18"
  }
}