Extrinsic 20491-1

{
  "heartbeat": {
    "blockNumber": 20490,
    "sessionIndex": 341,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x92a5b28d374f06b67465be949fb7929044ab8eeddc179ac7a72293243725805935281788a01171650dafef106549bc2c0f656dc374dfa7e936eb387d96407e86"
}