matrix-spec/event-schemas/examples/m.room.encrypted#megolm

{
  "content": {
    "algorithm": "m.megolm.v1.aes-sha2",
    "ciphertext": "AwgAEnACgAkLmt6qF84IK++J7UDH2Za1YVchHyprqTqsg...",
    "device_id": "RJYKSTBOIE",
    "sender_key": "IlRMeOPX2e0MurIyfWEucYBRVOEEUMrOHqn/8mLqMjA",
    "session_id": "X3lUlvLELLYxeTx4yOVu6UDpasGEVO0Jbu+QFnm0cKQ"
  },
  "event_id": "$WLGTSEFSEF:localhost",
  "room_id": "!Cuyf34gef24t:localhost",
  "origin_server_ts": 1476648761524,
  "sender": "@example:localhost",
  "type": "m.room.encrypted"
}