Mt. Gox — originally a trading card exchange (“Magic: The Gathering Online eXchange”) repurposed for Bitcoin by Jed McCaleb and later run by Mark Karpelès — was the first major Bitcoin exchange and the first major exchange disaster. At its peak, Mt. Gox handled approximately 70% of all global Bitcoin trading. Its collapse in February 2014, with 850,000 BTC lost (worth approximately $450 million at the time), shaped the industry in ways that still resonate a decade later.
The collapse happened gradually, then suddenly. Mt. Gox had been losing Bitcoin through security vulnerabilities for years — the theft likely began as early as 2011. By the time the exchange suspended withdrawals in February 2014 and filed for bankruptcy, 850,000 BTC (representing approximately 7% of all Bitcoin in existence) were gone. Later, 200,000 BTC were “found” in old wallets, reducing the loss to 650,000 BTC — still by far the largest cryptocurrency theft at that time.
Mark Karpelès was arrested in Japan in 2015 on charges of manipulating financial records (not directly for the theft). He was convicted on some charges and acquitted on others, receiving a suspended sentence. The legal proceedings for creditor repayment dragged on for nearly a decade, with creditors finally beginning to receive partial repayments in 2024 — at Bitcoin prices roughly 100x higher than when they lost their coins, meaning many creditors received more in dollar terms than their original deposits were worth.
Mt. Gox’s impact on the industry was profound. “Not your keys, not your coins” became the defining security mantra — a direct response to Mt. Gox proving that exchange custody is risky. The exchange’s failure drove the development of proof-of-reserves (exchanges proving they hold customer funds), better security practices, and regulatory requirements for crypto custody. Every subsequent exchange collapse — QuadrigaCX, FTX — echoed Mt. Gox’s lesson: centralizing crypto custody recreates the same risks that Bitcoin was designed to eliminate.
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