A recent report from Wall Street broker Bernstein highlights the growing threat of quantum computing to Bitcoin and the broader cryptocurrency ecosystem. While acknowledging that advances in quantum computing pose a credible threat, the broker emphasizes that this risk is manageable and not an immediate concern.
The report notes that recent breakthroughs, such as Google Quantum AI's reduction in qubit requirements, have accelerated the timeline for potential attacks on modern cryptography. However, scaling quantum systems to the level needed to break widely used encryption remains a complex challenge.
Analysts at Bernstein argue that quantum computing should be viewed as a medium to long-term system upgrade cycle rather than an existential risk. Quantum computers, which use the principles of quantum mechanics, have the potential to solve certain problems more efficiently than classical computers, including breaking encryption. The report highlights that the threat of quantum computing spans multiple industries, from finance to defense, and that Bitcoin is not uniquely vulnerable.
In fact, the broker notes that exposure is concentrated in approximately 1.7 million BTC held in older wallets, while newer practices and protocols reduce vulnerability. Furthermore, Bitcoin mining, which relies on SHA-based hashing, remains secure even in advanced quantum scenarios. Bernstein expects the crypto industry to have sufficient time, around three to five years, to transition toward post-quantum cryptography, with upgrades such as new wallet standards, reduced address reuse, and key rotation already under discussion. An academic paper recently noted that attacking the Bitcoin blockchain through quantum mining would require an enormous amount of energy, equivalent to the output of a star.