Extrinsic 17648-1

{
  "heartbeat": {
    "blockNumber": 17646,
    "sessionIndex": 294,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x2ca8669513ccba89d63dec6f5ce5fc59ae412a65f7abe4f591f7b4899a32d11ae307d5e1741ab8600ed88ca6492bbec32e1e4707a37733c19e603efa3192e18a"
}