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A blockchain is a distributed general public ledger ??or on-line digital databases ??which contains a history of the many transactions over a System.간단??말해?? 채굴 ?�비???�로??비트코인??채굴?�기 ?�해 ?�별??고안??고급 ?�업?�라�?�????�습?�다.만약 비트코인 결제가 ?�못???�호?�폐 지갑