Extrinsic 4752-1

{
  "heartbeat": {
    "blockNumber": 4751,
    "sessionIndex": 79,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x941a1d157f8d619c6571e0ca8b9048c6a5dad18bed5443a9486c02459ca4123018778833aba3416a15e290d88e634bff52169f89db3e6dfedbe9d90009014a83"
}