Extrinsic 38738-1

{
  "heartbeat": {
    "blockNumber": 38737,
    "sessionIndex": 645,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x9223335e6d0e52aa3c2fd01a0429831a52e6878faa659450079bc422df963f2dd6c2350b8cfbe8ae3c54b555276bed1cd343612a58213d544abf22696652468c"
}