??????????? ??? ????? ??? ?? ????? ???, ? ?????, ? ???????, ? ???? ??? ? ??????? ????????? ?? ?????????. ?????? ?? ????? "???? ?? ?????? ????? ????????? ???? ??????".Cryptocurrencies use various timestamping strategies to "verify" the validity of transactions added on the blockchain ledger with no have to have for any dependable 3rd party.????? ???