Could Quantum Computing Break Bitcoin? According to Bernstein, the threat is very real, but the network still has 3 to 5 years to prepare. Here's what investors and developers need to know in 2026 to anticipate this technological revolution and protect their assets.
In brief
- Bitcoin has already anticipated quantum risk in its price, according to Bernstein, reducing the potential impact of a future attack.
- The Bitcoin market has 3-5 years to adopt post-quantum solutions, such as key rotation and new secure algorithms.
- Institutional players (Strategy, BlackRock) will play a key role in accelerating this transition and strengthening network security.
Quantum computing, a real but not immediate threat to Bitcoin
Recent advances in quantum computing have reduced the number of qubits needed to attack crypto algorithms like ECDSA, used by Bitcoin. Bernstein, in a recent note published in April 2026, confirms that this threat is now credible, but remains manageable in the medium term. Indeed, Bitcoin has a window of 3 to 5 years to prepare. This, thanks to progressive upgrades and coordination between developers, miners and institutions.
Technological advances have compressed the timelines initially estimated for a successful quantum attack. However, Bernstein emphasizes that the risk is neither existential nor immediate. According to Gautam Chhugani, this threat should be seen as an upgrade cycle rather than an impending crisis. However, Google Quantum AI data shows that a quantum attack could theoretically be successful in less than 10 minutes! But only if ideal conditions are met, which remains unlikely in the short term.
How can bitcoin prepare for the post-quantum era?
To face the quantum threat, bitcoin must adopt concrete technical solutions. Bernstein recommends in particular rotating private keys and abandoning reused addresses, which are the most vulnerable. A transition to post-quantum algorithms, such as Lamport, Winternitz or XMSS, is also envisaged. These solutions would make it possible to secure transactions even in the face of powerful quantum computers.
However, the most important challenge remains the social one. Indeed, convincing bitcoin holders to migrate to new standards will take time, as past upgrades, such as Taproot and SegWit, have shown. Bernstein estimates that this transition could take several years, due to the need to educate users and provide them with suitable tools.
Quantum computing represents a major challenge for bitcoin, but also an opportunity to strengthen its security. With 3 to 5 years to act, developers and investors must work together to prepare for this transition. What if this threat became the catalyst for a new era for BTC?
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