????? ???????? ????? ?????? ?????? ??????? ???? ???? ???? ?? ?????. like a rule, transactions with cryptocurrencies are irreversible. the moment a transaction is confirmed to the blockchain, it could no more be reversed. ?????? ?? ?????? ??? ??? ???? ?? ??????? ?????? ?? ???? ?????? ????????? ?????? ??? ??? ?????? ?? ???? ???? ???????? ?????? ??