Extrinsic 19573-1

{
  "heartbeat": {
    "blockNumber": 19571,
    "sessionIndex": 326,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x6a675ee7ecb67625eed5d8a9310b5b8c432261f6f44fd733abcd3d10289e123609a374736e2a27cc001cfe0e33436e7c247c566c39e0170869504f0d21767e85"
}