Extrinsic 588-1

{
  "heartbeat": {
    "blockNumber": 587,
    "sessionIndex": 9,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x9e71af71fbbb62797d775b30fad53aadf7cd59dfea331b37612103babf8a8370c5ec58abc7a7e61e895348db69c20ec6ab4492a5097fa60376b87bf960fe1d8a"
}