Twelve years after it collapsed, Mt. Gox is still unwinding. On October 16, 2026, the court-appointed rehabilitation trustee moved the repayment deadline for the failed Tokyo exchange to October 31, 2027, the sixth extension since January 2023. Wallets attributed to the estate still held about 34,400 bitcoin as of October 20, roughly a quarter of the 141,686 BTC reported in 2018. The exchange that once handled more than 70% of global bitcoin trading has not quite finished closing its books.

At its 2013 peak, Mt. Gox dominated bitcoin trading, which made its February 2014 failure a shock to the whole system. The exchange halted bitcoin withdrawals on February 7, suspended trading on February 24, and filed for creditor protection in Tokyo four days later, reporting about 850,000 BTC missing, some 750,000 of it belonging to customers. A month later it found 199,999.99 BTC in an old wallet, cutting the shortfall to about 650,000 BTC. In 2023, US prosecutors charged two Russian nationals over the theft, alleging they took at least approximately 647,000 BTC starting around September 2011; those charges remain allegations.

The case’s long tail comes from a legal detour. Under Japanese bankruptcy rules, creditors’ claims were fixed in yen at 2014 prices, which would have let the estate’s later gains flow to shareholders instead. A creditor petition moved the case into civil rehabilitation, which permits repayment in kind. That process began on June 22, 2018, when the Tokyo District Court appointed Nobuaki Kobayashi as trustee. Repayments in bitcoin and Bitcoin Cash started in early July 2024, and by March 2025 the trustee said more than 19,500 creditors had been paid through exchanges.

The October 2026 notice gives two reasons for the latest extension: many creditors have not completed the required procedures, and others ran into problems during repayment. The trustee does not publish a running total of distributed coins, so the clearest public measure is on-chain data. Arkham Intelligence’s estimate of about 34,400 BTC remaining, worth roughly $2.8 billion at late-October prices, suggests about three-quarters of the 2018 holdings have already left the estate’s wallets.

None of this changes the core lesson. Bitcoin held on an exchange is a claim against that exchange, not a coin the customer controls. When Mt. Gox failed, its customers became creditors in a court process that has now run for more than twelve years. The losses also went unnoticed for years because customers had no independent way to check balances against deposits, the gap that proof-of-reserves reporting is meant to close when it covers liabilities as well as assets and is checked by an outside firm.

For creditors, the practical rule is unchanged: rely only on notices published at mtgox.com and watch for fraudulent sites and emails that impersonate the trustee. For everyone else, the takeaway is narrower and more durable. Custody risk is not a relic of 2014; it is a standing feature of any arrangement where someone else holds the keys, and it can hide for years before it resolves.

Source: BlockchainReporter.