A blockchain is actually a distributed community ledger ??or on the internet digital databases ??that contains a history of every one of the transactions on 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?? 비트코인?� ?�계?�인 공동체�? 만들�? https://yurii665fxp6.bloginder.com/profile