Recent research indicates that advances in quantum computing are rapidly shrinking the timeline for potential attacks on cryptocurrencies, with new predictions placing the risk between 2030 and 2032. A notable report from Citi researchers highlights that Bitcoin appears more vulnerable to these threats compared to Ethereum, primarily due to structural and governance issues rather than code weaknesses.
The researchers assert that Bitcoin’s governance model presents a significant barrier to transitioning to quantum-resistant cryptography. Before any upgrades can be implemented to safeguard against quantum attacks, broad consensus across the network is crucial. This involves extensive testing and potentially a hard fork—both of which can be contentious and slow processes within Bitcoin’s conservative community.
In contrast, Ethereum and other proof-of-stake networks are positioned more favorably. Their adaptable governance structures and consistent history of successful protocol upgrades allow them to respond more swiftly to emerging threats. However, they are not completely exempt from risks associated with quantum computing. A quantum-enabled attacker could potentially gain control over approximately 33% of staked assets, which could disrupt network operations and block finality.
One of the critical vulnerabilities remains the substantial amount of dormant Bitcoin, estimated between 6.7 and 7 million coins, which reside in wallets with already exposed public keys. This makes them particularly appealing targets for any quantum adversary. Among this dormant Bitcoin, around 1 million coins believed to have been mined by Satoshi Nakamoto are still untouched and stored in early address formats, representing a value of approximately $82 billion at current market rates.
Citi’s analysts emphasized that adaptability will be the key to long-term resilience against quantum threats. They noted the importance of monitoring proposed upgrades such as BIP-360 and BIP-361, which aim to bolster Bitcoin’s defenses in anticipation of quantum computing capabilities.
This sentiment was echoed by Fireblocks CEO Michael Shaulov during the Financial Times Digital Asset Summit, where he highlighted that the primary challenge posed by quantum computing for Bitcoin is largely a matter of coordination within the community, rather than a purely technical issue. The unsettling prospect of quantum attacks poses significant implications for the cryptocurrency landscape, raising urgency for proactive measures and strategic planning among developers and stakeholders.
