Extrinsic 1188-1

{
  "heartbeat": {
    "blockNumber": 1187,
    "sessionIndex": 19,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xa88aac9a50f14fc2d82e5a35917b012fcf62b26f90e17b69ff3698040c2e7114d83018878304a2afbaef0245b498bfcbc3fd89c8607085453b39ba93ae4a138f"
}