In 2014 the world's largest Bitcoin exchange lost around 850,000 coins. A decade later, Mt. Gox still shapes how crypto thinks about trust, custody, and exchange risk.
In February 2014, the world's largest Bitcoin exchange went dark. Mt. Gox had lost around 850,000 bitcoin, then worth about 473 million dollars and today worth tens of billions. A decade later it still shapes how crypto thinks about trust, custody, and exchange risk.
If you have ever heard "not your keys, not your coins," this is the disaster that burned the lesson in.
Mt. Gox started life in 2010, and its name is a leftover from a Magic: The Gathering card-trading site. Under Mark Karpeles it grew explosively, and at its peak it handled around 70 percent of all Bitcoin transactions worldwide. For a few years, for most people, Mt. Gox simply was Bitcoin.
The collapse was not one dramatic heist. Hackers had reached the exchange's hot wallet as early as 2011, and coins leaked out slowly for years while weak controls and almost no auditing meant nobody noticed the hole growing. By the time Mt. Gox admitted the scale of the loss in 2014, roughly 850,000 bitcoin were gone, about 750,000 belonging to customers.
The failure was not exotic. It was basic custody and bookkeeping: funds held in a hot wallet, no proof of reserves, and no independent audit to catch the slow drain.
Mt. Gox halted withdrawals, then filed for bankruptcy in early 2014, leaving roughly 127,000 creditors. The case moved into civil rehabilitation in Japan, and after years of legal process, repayments to verified creditors finally began in July 2024 in bitcoin, bitcoin cash, or money. Because Bitcoin's price had risen so far since 2014, many creditors received far more in dollar terms than they originally lost, an unusual ending to a brutal story.
The lessons are still the foundation of how careful people use exchanges today:
While your crypto sits on an exchange, you are trusting that exchange to stay solvent and secure. Mt. Gox is why people move savings to self-custody. Start with what a seed phrase is and how to move crypto to a wallet.
After Mt. Gox, an exchange's history and willingness to prove its reserves became real selection criteria, not afterthoughts. It is part of how we score platforms in our review method.
Smaller and larger collapses have happened since, FTX being the obvious one, so the answer is yes. Exchanges are far more scrutinised now, but the safest assumption has not changed: an exchange is a place to trade, not a vault. Keep there only what you are actively using.
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Compare exchangesOnce the largest Bitcoin exchange, it collapsed in 2014 after losing around 850,000 bitcoin to a years-long hack and weak controls, then filed for bankruptcy.