One of bitcoin's major exchanges went offline on Tuesday morning amid fears that it is on the verge of bankruptcy. The Japan-based Mt. Gox's website turned up blank on Tuesday and trading on it had be halted. Documents allegedly leaked from the company and published on a blog says that 740,000 bitcoins are missing from Mt. Gox, which translates to hundred of millions of dollars in losses, according to The Associated Press. Customers have been unable to withdraw their bitcoins, a virtual currency, or convert them into U.S. dollars since the beginning of February. The site's disappearance follows Mt. Gox CEO Mark Karpeles' resignation from the board of the Bitcoin Foundation.