Extrinsic 4609-1

{
  "heartbeat": {
    "blockNumber": 4607,
    "sessionIndex": 76,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xacbdae198ad039e8ffbb2495fa9a6af82fcf8a40bf8e7c92269955db437b13405430d75f610f1fd3ff455b3f356b7a529599206ac57c16cd1efd396e8cca2482"
}