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A blockchain is often a distributed public ledger ??or on-line digital database ??which contains a file of each of the transactions on a System.간단??말해?? 채굴 ?�비???�로??비트코인??채굴?�기 ?�해 ?�별??고안??고급 ?�업?�라�?�????�습?�다.?�력 비용??막�??�기 ?�문??�?고려 ?�야 ???�