Extrinsic 4246-1

{
  "heartbeat": {
    "blockNumber": 4244,
    "sessionIndex": 70,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xc447e098edd3eb10f82672d148d1e4a3e633da6f637f6c09b9641afe3e5ade242608e851b24c3947768b8377b05dc33657a28332a650e9689ab8b70c4c226886"
}