Bitcoin medals represent the digital currency whose creator's identity has remained a mystery. Karen Bleier/AFP/Getty Images hide caption
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A bow and an apology: Mark Karpeles, CEO of Mt. Gox, was contrite at the start of a news conference in Tokyo on Friday in which it was announced that the firm has filed for bankruptcy. Kyodo/Reuters/Landov hide caption
Kolin Burges, a self-styled cryptocurrency trader and former software engineer, was among a small number of protesters outside the Tokyo offices of bitcoin exchange Mt. Gox on Tuesday. Toru Hanai/Reuters/Landov hide caption