Mark Karpeles, president of MtGox bitcoin exchange speaks during a press conference in Tokyo on February 28, 2014. The troubled MtGox Bitcoin exchange filed for bankruptcy protection in Japan on February 28, with its chief executive saying it had lost nearly half a billion dollars worth of the digital currency in a possible theft. AFP PHOTO / JIJI PRESS JAPAN OUT (Photo credit should read JIJI PRESS/AFP/Getty Images)
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