Extrinsic 4659-1

{
  "heartbeat": {
    "blockNumber": 4657,
    "sessionIndex": 77,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x2af3ffe913864ae7386fa51186979f61669401b601071c967ea48ed092930720510dc0493103634307c50a73e64fbd839f01b4fb6932c09cc83819c263e16b8f"
}