Extrinsic 18046-1

{
  "heartbeat": {
    "blockNumber": 18045,
    "sessionIndex": 300,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x34a05882117252f97425fd143a1b0eda322b5529c0c0994e6fab946e1e06313f7e0f076db33a22f12c099de1afac293b20e9eff532fabda11608988bac3c508c"
}