Mt. Gox: the long tail of a custody failure

An exchange failure that outlasted several Bitcoin market cycles

Mt. Gox’s collapse in 2014 left customers with a problem that Bitcoin’s transaction rules could not solve for them: their exchange balances were claims against a company, while the company controlled the wallets. The subsequent proceedings continued long after the trading platform had disappeared. This makes Mt. Gox a history of custody, insolvency and delayed repayment, as well as a reminder that a functioning blockchain does not guarantee a functioning exchange.

The legal history needs precise dates. Mt. Gox applied for civil rehabilitation on 28 February 2014; that initial application did not lead directly to the later rehabilitation process. The official archive records its dismissal in April 2014 and the intervening bankruptcy proceedings. On 22 June 2018, the Tokyo District Court commenced civil rehabilitation and stayed the bankruptcy proceedings. Calling the whole period a single uninterrupted rehabilitation obscures that change. Trustee’s archive of notices.

1. 2014Initial rehabilitation application; bankruptcy followed.
2. 2018Civil rehabilitation began; bankruptcy proceedings were stayed.
3. 2024Some creditors received Bitcoin and Bitcoin Cash repayments.
4. 2025Trustee extended the named repayment deadlines to 31 October 2026.

From an account balance to a recognised claim

Before a failure, a customer may treat a displayed balance as money available for withdrawal. After withdrawals stop, several different questions emerge: what assets remain, which customer claims are recognised, what records support those claims and how the estate will distribute available assets. A deposit receipt can support a claim without giving its holder immediate control over the corresponding coins. That is the practical distinction explained in the custody guide.

The distinction also changes how losses and repayments should be described. A repayment measured against a recognised monetary claim is not automatically the same as returning every unit of cryptocurrency originally deposited. Asset quantity, the valuation basis of a claim and the market value on the day of payment are separate measurements. An article saying that creditors have been “made whole” needs to state which measurement it uses. A percentage without a denominator is not a meaningful account of recovery.

Repayments began for some creditors in July 2024

On 5 July 2024, the trustee announced that repayments in Bitcoin and Bitcoin Cash had been made to some rehabilitation creditors through designated exchanges. The notice made further payments conditional on checks involving registered accounts, the participating exchanges and safe processing. It did not say that every creditor had been paid. Repayment notice, 5 July 2024.

The difference between a distribution announcement and a completed individual payment matters. A trustee can begin sending assets while a particular creditor still has an unresolved registration or processing issue. A transfer visible onchain may establish that an estate wallet moved coins; it does not, by itself, show which customer has received an unrestricted balance at the destination exchange. Those are different stages of the repayment chain.

The deadline recorded in the October 2025 notice

The trustee’s notice of 27 October 2025 moved the deadlines for Base Repayment, Early Lump-Sum Repayment and Intermediate Repayment from 31 October 2025 to 31 October 2026, Japan time. It reported that many creditors with completed procedures and no processing issues had largely received those repayments, while others remained unpaid. This is a dated statement about the named repayment categories, not a promise that every outstanding issue will be resolved on that date. Deadline notice, 27 October 2025.

For anyone following the case, distinguish the date of a news report from the date and scope of the trustee’s underlying notice. Repeating a superseded deadline can send a reader towards the wrong process. The official archive remains the starting point for later notices; this historical entry is not a creditor’s account statement or an assessment of an individual claim.

A second risk: impersonation during repayment

The trustee’s website also warns about fraudulent websites and emails impersonating Mt. Gox or the trustee. Long proceedings create convincing material for an impersonator: real case names, old deadlines and genuine-looking account terminology. An accurate reference to the case does not authenticate the sender. Reach the filing system through the official archive rather than through an unsolicited repayment message. See recovery fraud and advance-fee recovery scams for the separate problem of demands for another payment.

Sources and further reading

• Mt. Gox: official trustee archive
• Trustee: repayments in Bitcoin and Bitcoin Cash, 5 July 2024
• Trustee: change of repayment deadlines, 27 October 2025
• The custody guide explains the distinction.
• Recovery fraud explains why a long-running claims process creates another opportunity for deception.