http://www.nytimes.com/2014/02/25/b...t-at-mt-gox-shakes-bitcoin-world.html?hp&_r=0 The most prominent Bitcoin exchange appeared to be on the verge of collapse late Monday, raising questions about the future of a volatile marketplace. On Monday night, a number of leading Bitcoin companies jointly announced that Mt. Gox, the largest exchange for most of Bitcoin’s existence, was planning to file for bankruptcy after months of technological problems and what appeared to have been a major theft. A document circulating widely in the Bitcoin world said the company had lost 744,000 Bitcoins in a theft that had gone unnoticed for years. That would be about 6 percent of the 12.4 million Bitcoins in circulation. Bitcoin exchange Mt. Gox disappears in blow to virtual currency Mt. Gox, once the world's biggest bitcoin exchange, looked to have essentially disappeared on Tuesday, with its website down, its founder unaccounted for and a Tokyo office empty bar a handful of protesters saying they had lost money investing in the virtual currency. The digital marketplace operator, which began as a venue for trading cards, had surged to the top of the bitcoin world, but critics - from rival exchanges to burned investors - said Mt. Gox had long been lax over its security. It was not clear what has become of the exchange, which this month halted withdrawals indefinitely after detecting "unusual activity." A global bitcoin organization referred to the exchange's "exit," while angry investors questioned whether it was still solvent. A document circulating on the internet, and purporting to be a crisis plan for the exchange, said more than 744,000 bitcoins were "missing due to malleability-related theft", and noted Mt. Gox had $174 million in liabilities against $32.75 million in assets. It was not possible to verify the document or the exchange's financial situation.