{
  "age": 242352,
  "content": {
    "membership": "join",
    "avatar_url": "mxc://localhost/SEsfnsuifSDFSSEF#auto",
    "displayname": "Alice Margatroid"
  },
  "state_key": "@alice:localhost",
  "origin_server_ts": 1431961217939,
  "event_id": "$WLGTSEFSEF:localhost",
  "type": "m.room.member",
  "room_id": "!Cuyf34gef24t:localhost",
  "sender": "@example:localhost"
}