Extrinsic 4237-1

{
  "heartbeat": {
    "blockNumber": 4235,
    "sessionIndex": 70,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x12b9540894d2f5605fa9ed9dc65866d262c80636d17d5df4a71f073f29d3043a05e04f5b64aef1c6ff7ccc189217456e8b05baf3118c40b5e9aa9798d8319d8a"
}