site.standard.graph.subscription

{
  "key": "tid",
  "type": "record",
  "record": {
    "type": "object",
    "required": [
      "publication"
    ],
    "properties": {
      "publication": {
        "type": "string",
        "format": "at-uri",
        "description": "AT-URI reference to the publication record being subscribed to (ex: at://did:plc:abc123/site.standard.publication/xyz789)."
      }
    }
  },
  "description": "Record declaring a subscription to a publication"
}