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 itoggle caption Toru Hanai /Reuters/Landov The Two-Way Bitcoin Exchange Mt. Gox Goes Dark After Theft Report February 25, 2014 The Tokyo-based company is the subject of reports that a large amount of the virtual currency may be missing. It's another blow to the bitcoin market.