The lack of the central authority can also make cryptocurrencies safer. "It really is hack-proof since there's no 1 central stage of failure," clarifies David Donovan, government vp at Publicis Sapient.??? ???????? ?? ????? ?? ???????????? ?? ??? ??? ???? ?????????? ?????, ?? ????????? ?????????????? ??? ?? ????? ?????????? ?? ??? ?????????? ???? ?