A blockchain is usually a distributed public ledger ??or on line digital database ??that contains a file of many of the transactions with a System. ?�러???�유�? 로그?? ?�출 ?�세??관�??�는 ?�티 ?�싱 ?�구???�???�중 ?�는 ?�중 ?�소 ?�증???�함?�여 교환???�는 ??지�??�공?��? ?�공?�는 모든 보안 ?�구�??�전???�용?�는 것이 중요?�니?? ???�려�?많�? ?�드?�어 지�?모델?� ?�용?�기 ?�운 ?�터?�이?��? https://johnnypfvky.blog5star.com/30712615/the-2-minute-rule-for-bitcoin