Extrinsic 4128-1

{
  "heartbeat": {
    "blockNumber": 4127,
    "sessionIndex": 68,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x7c06250a6cabf19f6e4bfb9bfa0428566898f64f8f0ed3ecb528bcfae435b76fd0833044f357bbd81c9f4851a3bedd9df33de78ca37b22620671c966afa59881"
}