sometimes i see this

 SC: Stratum - Connected (europe.hub.miningpoolhub.com:20550)
 SC: Received unknown response: {"id":null,"method":"mining.notify","params":["6
0d","0x6b6564206265666f72652069742063616e2062652075736564227d0a","0x000000001253
3fe68fd3d1cfe47445abdce0b117994feb3fbbe16e3d0f675ad9",true]}