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A man walks out of a shop displaying a bitcoin sign during the opening ceremony of the first bitcoin retail shop in Hong Kong on February 28, 2014. Bitcoin was invented in the wake of the global financial crisis by a mysterious computer guru using the pseudonym Satoshi Nakamoto and unlike other currencies, it does not have the backing of a central bank or government. AFP PHOTO / Philippe Lopez (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)