Extrinsic 4724-1

{
  "heartbeat": {
    "blockNumber": 4722,
    "sessionIndex": 78,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xf493fbf7da042a63a557762f59b56cbe1c83beb69b7501833d576d603e53b8248a170b8b59ddfe61afa3cd3bc74798da9b57a9513fb093fb9dca07d2dba16e8b"
}