Assessments are emerging that advances in quantum computers could become a tangible threat to bitcoin and the cryptocurrency ecosystem. The market, however, is increasingly leaning toward viewing it as a medium- to long-term security system transition, rather than an immediate crisis that would shake bitcoin's survival.

On April 8, blockchain outlet CoinDesk reported that Wall Street investment bank Bernstein said in a recent report that advances in quantum computing are bringing forward the point at which attacks on modern cryptographic systems could become possible. It highlighted recent progress that was reported to have reduced the number of qubits needed by Google Quantum Artificial Intelligence (AI), and said it is becoming harder to view the quantum threat only as a distant problem more than 10 years away. It added that scaling quantum systems to a level that can actually break widely used cryptography still requires a complex series of steps.

Bernstein's analyst team led by Gautam Chhugani said in the report that the quantum threat should be seen as a medium- to long-term system upgrade task rather than a driver of short-term collapse. It effectively interpreted bitcoin's quantum risk as a security system transition that the industry needs to prepare for, rather than an immediate crisis.

The report also laid out specific weak points. It said exposure is concentrated mainly in old legacy wallets holding about 1.7 million BTC. By contrast, it said more recent wallet operating practices and protocols have evolved in ways that reduce vulnerabilities. That underscores that the impact of quantum computers across cryptocurrencies is not structured to appear equally in all areas.

It judged bitcoin mining to be relatively more defensible. Bernstein said bitcoin mining relies on SHA-256-based hashes and therefore remains effectively safe even under advanced quantum scenarios. It also said other industries such as finance and defense are exposed to the same threat, and that it should be viewed as a long-term risk across industries rather than a crisis unique to bitcoin.

It also assessed that the industry still has room to respond. Bernstein forecast the crypto industry could have about 3 to 5 years to transition to post-quantum cryptographic systems. It also noted that discussions are already under way on related upgrades, including introducing new wallet standards, reducing address reuse and key rotation.

A similar view was reflected in remarks by Adam Back (아담 백), chief executive of Blockstream. He said in an interview with Bloomberg that while the possibility that quantum computers could threaten bitcoin security exists in theory, the key at this stage is not to exaggerate or deny the threat itself. He said the focus of a real response is on not missing the timing for preparation.

He said current quantum computer hardware generally lacks error correction, and that it should be viewed not as a short-term shock that will break existing cryptographic systems but as a long haul, he said. Even so, he said that does not mean a delayed response is acceptable. He proposed as a prudent approach that bitcoin offer an option to move keys in a quantum-resistant way and give users about a 10-year transition period to carry it out.

The discussion aligns with a broader shift in which post-quantum cryptography is moving beyond the research stage into actual adoption. Since the U.S. National Institute of Standards and Technology (NIST) finalized related systems in late 2024, market attention has been focusing less on when a quantum breakthrough might occur and more on how to sequentially transition existing cryptographic systems.

Back said preparation inside the ecosystem is already under way. He said a 20-person research team is working on the issue and is pushing to apply it in real operating environments through paper publication and implementation work. Blockstream's Liquid Network was also mentioned as one of the early test stages.

Academia is also suggesting the scope of the quantum threat should be assessed in a differentiated way. One recently cited study analyzed that attacking the bitcoin blockchain on the mining side with quantum computers would require energy on the scale of a star's power output. That shows that even if the quantum threat has entered the stage of realistic discussion, practical feasibility and the scope of impact could differ between wallet security and mining security.

The shared message of the discussion is clear. Advances in quantum computers are a long-term risk that the bitcoin ecosystem cannot ignore, but it is not yet at a stage to interpret it as an immediate signal of collapse. The market's next task is likely to focus on checking vulnerabilities in old wallets and setting out a path to orderly transition wallet standards and key management systems to quantum-resistant methods.