Extrinsic 1068-1

{
  "heartbeat": {
    "blockNumber": 1066,
    "sessionIndex": 17,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x248d4d0e62299ff67bf30dbb12d24516a9ac99764e97600bae2563b0a5e39e38e4fd28a279b5292fb66876411f6d6ef07c2c8e80a06d319f4e68a72040219987"
}