Bitcoin trader Kolin Burges, right, of London and American Aaron (only his first name was given) hold protest signs as they conduct a sit-in in front of the office tower housing Mt. Gox in Tokyo on Tuesday. The website of major Bitcoin exchange Mt. Gox is offline Tuesday amid reports it suffered a debilitating theft, a new setback for efforts to gain legitimacy for the virtual currency. The URL of Tokyo-based Mt. Gox was returning a blank page. The disappearance of the site follows the resignation Sunday of Mt. Gox CEO Mark Karpeles from the board of the Bitcoin Foundation, a group seeking legitimacy for the currency. Burgess said he had picketed the building since Feb. 14 after flying in from London, hoping to get back $320,000 he has tied up with Mt Gox.