Extrinsic 3886-1

{
  "heartbeat": {
    "blockNumber": 3884,
    "sessionIndex": 64,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x86fa732487d75cb6ed9c35eecc9ba9ffa5df7795afc76941b57c9fd891d587248ee4dc1a39c8ad66f1641f028ba75ef1f5120b8ba6ccdbf40dc0ee1e2de89984"
}