Extrinsic 18333-1

{
  "heartbeat": {
    "blockNumber": 18332,
    "sessionIndex": 305,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x880d510c488a1bc7f24e10d98c802c4447d5c510ac60ec665a86cb50f327355b20900df140800e85a181d6e46aceedf93348d7fe1b3f273fe269ecf7c42bb880"
}