Extrinsic 20916-1

{
  "heartbeat": {
    "blockNumber": 20914,
    "sessionIndex": 348,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xe0bb76e497ab5b70f4218efd0c9c36eabae84089c31c5287ece59916859a0a2b928a49de4d7b87b2095cd8349cbcb259b39bb2606f0ac2c1302f20ffbb29a689"
}