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Merkle root: A single hash (encrypted data) which contains all the hashed details from earlier transactions비트코인 채굴?�는 거래 블록?�서 ?��? ?�수료�? 지불하고자 ?�는 비트코인 ?�용?�들?�게 ?�선 ?�위�?부?�하�??�니?? processing speed of many professional Bitcoin miners?�most persons