??? ??? ?? ??????? ?? ????????, ???? ????????? ???? ????-?????????? ?????? ??? ?? ???????? ???? ???????? ??? ????? ?? ???????? ??????????????? ???? ??? ???????? ??? ??? ?? ?????????.Cryptocurrencies use many timestamping strategies to "demonstrate" the validity of transactions extra into the blockchain ledger with no need to have for just a reliabl