Recently, I saw some shocking news from the Bitcoin community. Former Mt. Gox CEO Mark Karpeles proposed a bold idea: to perform a Bitcoin hard fork to recover nearly 80,000 BTC stolen 15 years ago. What? A hard fork to reverse transactions? This directly conflicts with Bitcoin’s core principle — immutability. To understand why this proposal is so controversial, I need to explain what a fork is first.

What is a fork? Simply put, a hard fork is a permanent split in the blockchain protocol. It creates two separate versions: nodes (network nodes) that upgrade will follow the new chain, while nodes that do not upgrade will continue on the old chain. As a result, two distinct Bitcoins can emerge competing against each other. But here, Karpeles doesn’t just want the fork to upgrade the protocol normally — he wants to use the fork to disable old transactions, especially the 79,956 BTC sent to the hacker’s wallet.

The term "hard fork" sounds technical, but the idea behind it is actually very simple: changing the rules of the game. This requires overwhelming consensus from miners, node operators, and the entire community. If that consensus isn’t achieved, the fork will create a chain split — just like what happened with Bitcoin Cash in 2017.

Karpeles asserts this is just a one-time exception, not a general mechanism. But that’s the problem. If Bitcoin accepts this exception this time, then next time someone will demand another exception. Forks can be used to recover stolen funds, but they can also be used to reverse any transaction someone claims was a "mistake." That’s why blockchain experts warn: Bitcoin’s immutability is its foundational trust.

By the way, there’s another precedent. In 2016, Ethereum carried out a controversial hard fork to recover funds from the DAO hack. At that time, the assets were worth about $50 million, but the fork still led to a split into Ethereum (ETH) and Ethereum Classic (ETC). Now, Karpeles wants to do the same with Bitcoin, but on a much larger scale — 79,956 BTC currently valued over $5 billion. The Bitcoin community has long rejected similar actions, viewing them as violations of its core principles. This fundamentally differs from Bitcoin’s philosophy.

There’s another interesting detail: these 79,956 BTC are not part of the current Mt. Gox creditor recovery process. That process involves about 200,000 BTC under the control of the asset manager. But the 79,956 BTC from the 2011 attack have been dormant for 15 years, never moved. They exist in a unique ambiguous state, which is why the fork is being proposed.

In reality, executing this hard fork would require near-universal consensus. It would need a specific Bitcoin Improvement Proposal (BIP), then be approved by the majority of miners. The initial reaction from the community? Very skeptical. Many see Karpeles — who previously served jail time related to Mt. Gox’s collapse — as a controversial figure to lead this effort.

If the fork actually happens, the consequences could be significant. The market could experience volatile swings due to uncertainty. There’s a risk of a permanent chain split, diluting security. Trust in Bitcoin as an immutable store of value could also be undermined. Most importantly, it would set a dangerous precedent for future governance decisions.

Essentially, this proposal raises a profound question: should justice and recovery be prioritized over the protocol’s immutability? It’s a battle between humans and machines, between ethics and mathematics. Bitcoin is built on the idea that once transactions are confirmed, they are permanent and unchangeable. Ignoring this principle, even for noble reasons, could undermine the entire system’s foundation of trust.

This debate will surely continue. Developers, miners, and the broader community will face a historic decision. The world is watching to see whether Bitcoin will stand firm or make an exception. If you still don’t fully understand what a fork is, now you know: it’s a vote on the core values of the entire system. And this time, the stakes are extremely high.