BERLIN, GERMANY – APRIL 11: A sign announces a proprieter’s loyalty to Bitcoins, where they are also accepted for payment, at a pub on April 11, 2013 in Berlin, Germany. Bitcoins are a digital currency traded on the MTGox exchange, and the value of the virtual money fluctuated from USD 260 per bitcoin down to USD 130 per bitcoin yesterday and recovered somewhat in trading today. (Photo by Sean Gallup/Getty Images)
