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Bitcoin is a peer-to-peer payment network and digital currency with a public transaction log introduced in 2009 by pseudonymous developer "Satoshi Nakamoto".
The U.S. dollar is the currency most used in international transactions and is one of the world's most dominant reserve currencies. Several countries use it as their official currency, and in many others it is the de facto currency. It is also used as the sole currency in two British Overseas Territories: The British Virgin Islands and the Turks and Caicos islands.