The Mt. Gox Collapse: Bitcoin’s First Major Exchange Failure

At its peak, one single company handled the overwhelming majority of all Bitcoin trading on Earth. Then, in early 2014, it collapsed — and the entire industry learned a painful lesson about custody that still shapes Bitcoin culture today.

Mt. Gox, based in Tokyo, was originally launched in 2010 as a trading site for collectible cards before pivoting to become the dominant Bitcoin exchange of its era. By 2013, it was reportedly handling a substantial majority share of all Bitcoin trades worldwide.

In February 2014, Mt. Gox abruptly halted withdrawals, went offline entirely, then filed for bankruptcy protection. The company revealed that approximately 850,000 BTC belonging to the exchange and its customers had gone missing, later attributed primarily to hacking that had reportedly been ongoing for years and significant internal mismanagement.

The collapse triggered a sharp price drop and a genuine crisis of confidence in Bitcoin exchanges generally, since Mt. Gox’s dominant position meant its failure was a stress test for the entire ecosystem’s custodial infrastructure — one the ecosystem largely failed.

The legal aftermath dragged on for over a decade. Mt. Gox’s bankruptcy proceedings, and a later civil rehabilitation process, took years to determine how remaining recovered assets would be distributed to affected creditors, with actual repayments only substantially beginning many years after the original collapse.

Mt. Gox’s failure is widely credited with popularizing the phrase not your keys, not your coins within the Bitcoin community — a blunt reminder that funds held on a centralized exchange are only as safe as that exchange’s security and management.

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