Extrinsic 3987-1

{
  "heartbeat": {
    "blockNumber": 3986,
    "sessionIndex": 66,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x0a37dd8e74d13300584e8d792b01cbcd09ea9336743e21f010ddf296cf77817caeae261cd1fd7154f8d1e51fead3cb384eb3f58ac351ba762d1e6ac6cd677d8d"
}