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Blockchains are exclusive in that, at the time a transaction has actually been recorded and verified, it may?�t be changed. The ledger only allows for just one-way data modification.То?г?ва?и ?о?н?ми к?ип?овал?? на ?по?овом?, ма?жинал?ном? ? ??�ючер?ном? ?инка?.Register your account and finish the p