Demo

gistfile1.txt

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "http://purl.org/coar/notify"
  ],
  "id": "urn:uuid:94ecae35-dcfd-4182-8550-22c7164fe23f",
  "type": "Announce",
  "actor": {
    "id": "https://generic-service.com",
    "name": "Generic Service",
    "type": "Service"
  },
  "context": "https://some-organisation.org/resource/0021",
  "object": {
    "id": "https://generic-service.com/resource/1234",
    "type": "Document",
    "url": {
      "type": "Link" ,
      "href": "https://doi.org/10.9357/123003" ,
      "rel": "cite-as"
    } 
  },
  "origin": {
    "id": "https://generic-service.com/system",
    "inbox": "https://generic-service.com/system/inbox/",
    "type": "Service"
  },
  "target": {
    "id": "https://some-organisation.org/system",
    "inbox": "https://some-organisation.org/system/inbox/",
    "type": "Service"
  }
}