Extrinsic 4418-1

{
  "heartbeat": {
    "blockNumber": 4417,
    "sessionIndex": 73,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x60367f8eae150cb0b5fc0b2d2f09b1606b7c5b62f68efac095cd6e00ad5a4e200ebc33addc484d5affb641019cd2a645d5cc104eba01df7117a0f3cabde6d286"
}