Extrinsic 38375-1

{
  "heartbeat": {
    "blockNumber": 38373,
    "sessionIndex": 639,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xa6ec2ac4295877585ea4314defb28b0ccd7cc9aeb781822f5ad553a829d5ed537f8d2a7a81039f65054a9b2fb838c9a71a4885dcdf32284d0901e5fb6c95d380"
}