{ "$ref": "event.json", "event_id": "$143273582443PhrSn:example.org", "room_id": "!jEsUZKDJdhlrceRyVU:example.org", "sender": "@example:example.org", "origin_server_ts": 1432735824653, "unsigned": { "age": 1234, "membership": "join" } }