Extrinsic 172709-1

{
  "heartbeat": {
    "blockNumber": 172707,
    "sessionIndex": 2878,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xd6445af575dc47220ebec9e6fb9e646eb45634ba245030e9576afb06bd0cf82cef11a39d06083b75d5198df80201baaf97d1b7a5a4d08f0f20e9d74ebda0fd8f"
}