The shortage of a central authority also can make cryptocurrencies safer. "It truly is hack-proof due to the fact there is not any a person central place of failure," points out David Donovan, executive vp at Publicis Sapient.??? ??? ????? ????? ??? ??????? ????? ???? ??????? ?? ???? ???????? ??? ??? ??????????? ?????????? ?? ??????????????? ??? ??