Extrinsic 20261-1

{
  "heartbeat": {
    "blockNumber": 20259,
    "sessionIndex": 337,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x08030b3a125390e9ba74c85d42bd15f49d5b0f9c845cb3b9252f6c4ed0429c45ecf50726fc0b5c0dea77435c2e96a0ec222d53b4eb60e7dacacb556a59415c8d"
}