Extrinsic 3819-1

{
  "heartbeat": {
    "blockNumber": 3818,
    "sessionIndex": 63,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x688fe898296b1049f2e7b26900dc5926f0b756aac4aa4399bfdbfd9365e1c71ed7f9b177d69ec4f8c24325c63ce17b049cbf4d463de1f87f190b80a3cff72e8d"
}