The rise of quantum computing has led Wall Street broker Bernstein to conclude that Bitcoin and the broader cryptocurrency ecosystem face a credible yet manageable threat. Recent breakthroughs in the field have accelerated the timeline for potential attacks on modern cryptography, with Google Quantum AI's reduction in qubit requirements being a notable example.
However, the broker cautions that scaling quantum systems to break widely used encryption remains a complex challenge. In a report, analysts led by Gautam Chhugani stated that quantum computing should be viewed as a medium to long-term system upgrade cycle rather than an existential risk. Quantum computing operates on the principles of quantum mechanics, utilizing qubits that can exist in multiple states simultaneously, enabling the processing of numerous possibilities at once. This property, combined with entanglement, allows quantum systems to solve certain problems more efficiently than classical computers.
The threat posed by quantum computing is not unique to Bitcoin, but rather spans multiple industries, including finance and defense. Approximately 1.7 million BTC held in older wallets are exposed to this risk, while newer practices and protocols reduce vulnerability. Bitcoin mining, which relies on SHA-based hashing, remains secure even in advanced quantum scenarios. The broker 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 and key rotation already under discussion.
A recent academic paper highlighted the significant energy requirements for attacking the Bitcoin blockchain through quantum mining, equivalent to the energy output of a star.