The lack of the central authority may make cryptocurrencies safer. "It's hack-evidence for the reason that there's no 1 central stage of failure," points out David Donovan, executive vice president at Publicis Sapient.??? ?????? ? ???????????? ?? ???????????? ??? ?????, ?? ??? ????????? ??? ?? ?? ??????????;: ??? ???????? ??? ?????, ??????? ?? ????