Extrinsic 18392-1

{
  "heartbeat": {
    "blockNumber": 18390,
    "sessionIndex": 306,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x54f62bcd8160e099fdea6b4d888e30dd9f90134abd12ee8881bad592afd3231a9573f185a33c94d7361fd6a7b9537489f986cc04ad452f4a9bb00c3ee1f38581"
}