Extrinsic 4299-1

{
  "heartbeat": {
    "blockNumber": 4298,
    "sessionIndex": 71,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xe45a7203b43aadf4ee953c33fba3e484fd59205d3c21f8544347a7541fce164867253c991ab878310d4ce87cdd5ab12b50b796248e13b3666ff70eaf13992686"
}