bitcoin is a money electronic made in 2009 by Satoshi Nakamoto. the name also Associated with the open source software that he design, and also use the network peer-to-peer without centralized storage or administrator single in which the Ministry of finance the United States call bitcoin a currency decentralized. unlike currency in general, bitcoin not depend with trust the publisher of the main. bitcoin using a database distributed and spread to nodes of a p2p network to the Journal of transactions, and use the cryptographic to provide functions basic security, such as to make sure that bitcoin-bitcoin can only be spent by people have it, and never be done more than one-time.