Extrinsic 1454-1

{
  "heartbeat": {
    "blockNumber": 1452,
    "sessionIndex": 24,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x560cbf8d526c2787ee652d3f5212d814f2e8f44a0362eb83abbab83cac9ed47c97f1cfbedf461ee214d62f4fd491096bc838811a821769d8e445b1031d01648f"
}