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Blockchains are distinctive in that, at the time a transaction is recorded and verified, it could possibly?�t be changed. The ledger only permits one-way facts modification.??дк?ий?е дл? ?ебе ?а о??имай?е до???п до зап??к? нови? ?окен?в?ок?а??й?е ?во? знанн? й о??им?й?е о??анн? ?н?о?ма?