Extrinsic 4301-1

{
  "heartbeat": {
    "blockNumber": 4299,
    "sessionIndex": 71,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x6ec0adde855df42c2b9f720cbfdd9484aac09c322693d1f6266996abac69027255248c17e90a1878d7b8f73da8749c7c50d91582e12617140ee7cabf9e06178c"
}