Extrinsic 4065-1

{
  "heartbeat": {
    "blockNumber": 4064,
    "sessionIndex": 67,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x3ef2a42b8648e54e8289fc80535ecddffc0893026759cc639dccf8be483f74129806f0a33bc368999f59195321f06ea8f5c4b037755f33952896797d51e9ab86"
}