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A blockchain can be a distributed public ledger ??or online digital database ??which contains a file of all the transactions on a System.비트코인 채굴???�해 ?�익??�??�도 ?�습?�다 - ?�히 ?�기가 �??�?�한 지??��?�는 ?�히 그렇?�니?? ?�한 ?�익?�의 ?��??� 비트코인???�재 가격에