??????????? ??? ????? ???????, ??? ????? ?????? ??? ???????? ??. ???? ???????? ??? ?? ?????? ?? ???? ???? ?? ????????? ??? ?? ???? ???? ?? ?????????.It's "an open up, distributed ledger that will document transactions involving two parties efficiently and in a verifiable and lasting way".[63] To be used to be a dispersed ledger, a blockchain is o