Extrinsic 18259-1

{
  "heartbeat": {
    "blockNumber": 18257,
    "sessionIndex": 304,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xd4d1b7c08dd5ca3f223677bd48ea0d2377383c835437f9bc88e7ad8ebad9bb6c043d9847be560a6e823ebc969378fe20758b475f5d74e9c49bc75c6d8762d78a"
}