????? ????????? ??? ???? ??? ?????????; ????????? ???? ??????? ??????? ??? ???????? ??? ?? ??? ????? ?????????? ? ?????????.Cryptocurrencies use various timestamping strategies to "show" the validity of transactions extra to the blockchain ledger with no need to have for the dependable 3rd party.??? ??? ?? ??? ????? ???? ??? ????? ?????? ?? ???????