The emergence of quantum computing poses a significant but controllable threat to Bitcoin and the broader cryptocurrency landscape, according to a report by Wall Street broker Bernstein. Recent breakthroughs in quantum technology have accelerated the timeline for potential crypto risks, but the firm argues that Bitcoin is likely to undergo a multi-year upgrade cycle rather than facing an existential crisis. The broker notes that while advances such as Google Quantum AI's reduction in qubit requirements suggest the risk is no longer a distant concern, scaling quantum systems to break widely used encryption remains a complex challenge.
Analysts led by Gautam Chhugani suggest 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 enables quantum systems to solve certain problems, such as breaking encryption, more efficiently than classical computers. However, the report emphasizes that the threat posed by quantum computing is a manageable, long-term risk that spans industries from finance to defense, rather than an existential one for Bitcoin.
Approximately 1.7 million BTC held in older 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.
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 and key rotation already under discussion.