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The Mt. Gox Collapse

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Mt. Gox was the largest Bitcoin exchange in the world. In the spring of 2013 it handled roughly 70% of all global BTC trading volume. On February 7, 2014, it suspended withdrawals. Three weeks later, on February 28, it filed for bankruptcy protection in Tokyo and announced that approximately 850,000 BTC, about 750,000 of them customer deposits, were missing. More than a decade later, repayments are still being processed.

The collapse fundamentally reshaped how the industry thought about exchange custody. The catchphrase "not your keys, not your coins" traces back to Mt. Gox.

The state of the chain that day

Mt. Gox suspended withdrawals on February 7, 2014. That day's Bitcoin blocks were around height 284,500-284,700. Block 285,000 came two days later, on February 9. Pull it to anchor the timeline:

Open in playground → early February 2014, around the suspension
Open in playground → confirms timestamp

Bitcoin traded as high as about $830 the evening before the suspension. By the time Mt. Gox filed for bankruptcy protection three weeks later, the market price had dropped below $580. The contagion sentiment was real.

The "200,000 BTC found"

On March 20, 2014, Mt. Gox announced they had located 200,000 BTC in an old wallet they'd forgotten about. (This is real. This actually happened.) Mt. Gox had moved these coins to offline wallets on March 14-15, and they came under the bankruptcy trustee's control that April. They became the foundation of the eventual creditor distribution.

The remaining ~650,000 BTC was never recovered. Some research has connected portions of it to the Russian-attributed BTC-e exchange. In 2017 US prosecutors indicted Alexander Vinnik and BTC-e, alleging that Vinnik laundered funds from the Mt. Gox hack. In June 2023 US prosecutors unsealed charges against two Russian nationals, Alexey Bilyuchenko and Aleksandr Verner, alleging the theft of about 647,000 BTC from Mt. Gox between 2011 and 2014.

A decade of bankruptcy court

Japanese bankruptcy law required creditors to claim the value of their BTC at the time of bankruptcy, in yen. Bitcoin's price had risen by the time the trustee actually had assets to distribute, which created a paradox: the recovered 200,000 BTC was worth far more in yen than the total claims. Creditors successfully petitioned for a switch to Civil Rehabilitation in 2018, which let them recover BTC pro-rata rather than in fixed yen amounts.

Bitcoin distribution began in July 2024. Pull a recent block to ground yourself in the "now" of this story:

Open in playground → today's tip

Roughly ten years between bankruptcy and the start of repayment. For a creditor who held a 1 BTC claim, the recovery is economic in dollar terms (and then some), but the optionality cost of not having the coins for a decade is enormous.

On-chain footprints

Mt. Gox's known cold-storage clusters (identified through community forensics over the years) have been monitored continuously by chain analysts. Every batch of repayments creates large transactions to centralized exchanges for redistribution. These show up as significant flows on chain whenever they happen.

Our future Address Monitoring API will surface these flows in real time once Phase 2 ships.

The lessons

The 200,000 BTC that were recovered, the years of legal process, the eventual partial repayments, all of it leaves a trail you can follow block by block. That auditability is the entire point.

Sources

Corrected October 2, 2026. An earlier version said Mt. Gox handled roughly 70% of trading volume by early 2014 and that all 850,000 missing BTC were customer deposits; the 70% share dates from spring 2013, and about 750,000 of the coins were customer deposits. It said bankruptcy was declared three weeks after the suspension and that the 200,000 BTC found in March 2014 moved to escrow accounts under a trustee; February 28 was a filing for bankruptcy protection, the bankruptcy order and the trustee came on April 24, 2014, and Mt. Gox itself moved the coins to offline wallets. It also placed the blocks of February 7, 2014 at heights 285,000-286,000 and measured the wait for repayment up to the current year; those blocks were around 284,500-284,700, and the wait, from 2014 to the first Bitcoin repayments in July 2024, was roughly ten years.

Read more: The Patoshi Pattern, The Inflation Bug, or 10,000 BTC for Two Pizzas.