Extrinsic 20249-1

{
  "heartbeat": {
    "blockNumber": 20247,
    "sessionIndex": 337,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x94dbc500312eb130c6d4c2d0fb73cc31786c33689fa541a301e681c329ca0b254e55ca677847cfffe1dbbc4babb2eec123cae505649d7d701a9c85aa7877c581"
}