Extrinsic 15287-1

{
  "heartbeat": {
    "blockNumber": 15285,
    "sessionIndex": 254,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xda158f0476869f050b8d78b31297166b3042837b36bb2c85e6b4a5b0e1883b62b7c8f8b711ad847bc7f169a6dc17adaca1fb304c618df95343a3f0a31b873c8d"
}