Former Mt. Gox CEO Proposes Bitcoin Hard Fork to Recover $5.2B in Stolen BTC

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TLDR

  • Mark Karpelès, the former CEO of Mt. Gox, has put forward a proposal for a Bitcoin hard fork to retrieve approximately 80,000 BTC that were stolen in a 2011 hack and are now worth over $5.2 billion.
  • The proposal would enable the transfer of funds without the original private key by means of a new consensus rule linked to a single wallet address.
  • Karpelès submitted the draft to GitHub as a starting point for discussion rather than a formal improvement proposal.
  • Critics contend that it sets a perilous precedent, threatening the core principle of immutability in Bitcoin.
  • The hacked coins are distinct from the approximately 200,000 BTC already being distributed to Mt. Gox creditors, with repayments continuing until October 2026.

Mark Karpelès, the former CEO of the collapsed Bitcoin exchange Mt. Gox, has released a draft proposal calling for a Bitcoin hard fork. The aim is to recover roughly 79,956 BTC stolen in a hack over 15 years ago.

The coins, currently located in a single wallet address, are worth more than $5.2 billion at today’s prices. They have not been moved since being stolen in June 2011.

Under current Bitcoin rules, funds can only be spent using the original private key, which has never been recovered.

Karpelès submitted the proposal on GitHub on Friday. He wishes to introduce a new consensus rule that would allow the funds to be transferred to a recovery address without that key.

Source: Github

The rule would only apply to that single wallet address. It would become active at a future block height if the network agrees to adopt it.

Karpelès was straightforward about what the proposal entails. “I want to be upfront: this is a hard fork,” he wrote.

He presented the submission as a means to break a stalemate. The Mt. Gox trustee, Nobuaki Kobayashi, has declined to pursue on-chain recovery without assurance that the community would support a protocol change.

Why Critics Are Pushing Back

The proposal has received strong criticism, mainly focused on Bitcoin’s immutability. It is designed such that transactions are final and irreversible.

Many in the Bitcoin community argue that altering the ownership rules for one address, even in an obvious theft case, sets a bad precedent. Forum users on Bitcointalk cautioned that it could lead to similar demands after future hacks.

The proposal itself acknowledges the risk. It states: “If it can be done once, the argument goes, it can be done again.”

There is also a governance issue. There is no clear process for determining which historical thefts justify rewriting Bitcoin’s protocol rules.

For a hard fork to succeed, it would require widespread support from miners, node operators, and exchanges. Historically, achieving consensus on contentious changes has been extremely difficult.

How This Fits Into Broader Mt. Gox Repayments

The 80,000 BTC in the hacked wallet are not part of the funds currently being disbursed to creditors. Those repayments come from a separate pool of approximately 200,000 BTC recovered after the exchange’s 2014 collapse.

Creditor repayments started in mid-2024 and the deadline has been extended to October 2026. The hacked coins remain completely outside trustee control.

Mt. Gox filed for bankruptcy in Tokyo on February 28, 2014, after losing around 750,000 customer bitcoins. The exchange had handled 70% of all global Bitcoin transactions at its peak.

Some creditors have voiced support for the proposal. One self-identified creditor said they received approximately 15% of their Bitcoin back through the bankruptcy and would support a court order to claim the remaining hacked coins.

The proposal remains a discussion draft without any formal backing or timeline.