The emergence of quantum computing poses a significant yet controllable threat to Bitcoin and the broader cryptocurrency ecosystem, as breakthroughs shorten the timeline for potential attacks on modern cryptography, Wall Street broker Bernstein stated. Recent advancements, such as Google Quantum AI's reduction in qubit requirements, indicate that the risk is no longer a distant concern. However, the firm noted that scaling quantum systems to break widely used encryption remains a complex, multi-step challenge. Analysts led by Gautam Chhugani suggested that quantum computing should be viewed as a medium to long-term system upgrade cycle rather than a risk.
Quantum computing operates on the principles of quantum mechanics, utilizing qubits that can exist in multiple states simultaneously, allowing for the simultaneous processing of many possibilities. This property, combined with entanglement, enables quantum systems to solve certain problems, such as breaking encryption, more efficiently than classical computers. The threat posed by quantum computers to cryptographic systems like elliptic curve encryption, which underpin crypto wallets, should be viewed as a manageable, long-term risk rather than an existential one for Bitcoin.
Approximately 1.7 million BTC held in older, legacy wallets are exposed, while newer practices and protocols reduce vulnerability. Bitcoin mining, which relies on SHA-based hashing, remains secure even in advanced quantum scenarios, according to the broker. 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. A recent academic paper noted that attacking the Bitcoin blockchain through quantum mining would require an enormous amount of energy, equivalent to that of a star.