Why Segwit2x Is a 51% Attack

Why Segwit2x Is a 51% Attack

In bitcoin’s Necronomicon of possible assaults and weaknesses, one reigns, the fifty-one percent attack. If there’s a worry that has performed on people’s minds because the end-of-days situation for bitcoin, it is this. Attackers who keep more than fifty percent of hashing power could prevent transactions from confirming or even reverse a few transactions. They might undermine the entire venture. Bitcoin’s design and its system of financial incentives has been set up particularly to fight the negative ability of a fifty-one percent attack. Moreover, it has worked. The fifty-one percent attack has remained a hypothetical bogeyman. Until now.

Through all indication, a coordinated fifty-one percent attack will start on November 16. That’s when a consortium of miners representing considerably more than fifty percent of the network’s hashing power and an allied organization of blockchain startups will seek to growth the block size. This may require a hard fork, which even as controversial, is a legitimate choice. In itself, this isn’t an attack.

However, the consortium’s attempt has evolved beyond a simple fork. It is now being developed not actually as an attempt to fork the chain, but to achieve this in such a manner as to intentionally prevent the ongoing existence of the reputation quo chain. Particularly, the developers concerned have declined to introduce replay safety.


The Segwit2x fork will create a scenario in which transactions performed on one fork, may be replayed on the second fork. In effect, customers may have finances on both blockchains, but any transaction they carry out on one blockchain should cause a lack of finances on the opposite blockchain. Replay safety is a reasonably easy-to-implement approach to protect customers from this danger. Network attacks are those moves keen on the goal of disrupting the protocol’s ordinary functioning. The Segwit2x change, bereft of replay safety, causes huge disruption.

Without replay safety in place, a minority chain becomes much less possibly to survive. The favored outcome for the consortium is that the status quo chain ceases to exist, that its transactions fail to verify. This is the literal definition of a fifty-one percent attack. If it sounds, a bit bizarre to call the consortium’s attempt an assault. The consortium accommodates many actual supporters of bitcoin, appearing in what they trust is right faith. They do not suggest to be attacking bitcoin.

However, without replay safety their efforts are like an autoimmune disease, having become overzealous and perverted. Therefore, bitcoin is eventually coming to come face-to-face with the mom of all attacks. That is a watershed moment. The very worst consequences are terrible indeed. Transactions ought to halt, faith within the system might be misplaced, bitcoin and by extension, the whole blockchain environment should prove to be far more susceptible to attack than we hoped.


There’s additionally another possible outcome. Bitcoin could show resilient to the consortium’s attack and emerge battered but unbroken. In so doing, bitcoin may have confirmed itself resilient to even its best foe. It is difficult to overstate how essential this will be to bitcoin’s perceived reliability. The danger that its regulations might come to be dictated by special interest organizations or hostile, country-subsidized parties have usually haunted Bitcoin.

This danger is never going away, but rather than the danger being a hypothetical bogeyman, it becomes a far more prosaic element, an effectively controlled danger. The fifty-one percent attack is bitcoin’s boss level. I don’t assume it is an exaggeration to mention that we’re now on the end of the start. If we effectively conquer this coming venture, bitcoin will not be simply a test, it will be a reality.

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