Experts Warn of Looming Quantum Computing Threat to Cryptocurrency, Stress Need for Proactive Planning

A newly released report commissioned by Coinbase serves as a warning to the cryptocurrency industry: while quantum computing does not currently pose an imminent threat to crypto, the sector cannot afford to delay in preparing for this eventuality. The report, compiled by an independent advisory board comprising notable cryptographers and academics, stresses that although existing blockchains are presently secure, the emergence of a fault-tolerant quantum computer that could compromise widely used encryption is becoming increasingly plausible. As such, the industry must initiate preparations without delay. Recent estimates by Google researchers suggest that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography. In response, major crypto ecosystems such as the Ethereum Foundation are proposing new digital signature types designed to be quantum-resistant, while others like Solana are exploring quantum-resistant wallet designs. The report underscores that current quantum machines lack the necessary power to crack the cryptography underlying Bitcoin, Ethereum, and other networks, as breaking standard encryption would require significant computational overhead. Nonetheless, the authors caution against complacency, stating that the construction of a large-scale, fault-tolerant quantum computer is inevitable, albeit with an uncertain timeline. This uncertainty poses a challenge, with estimates ranging from a few years to over a decade, and no reliable means of predicting breakthroughs. The U.S. National Institute of Standards and Technology recommends transitioning to quantum-resistant cryptography by 2035, a timeline that the report suggests may prove overly optimistic. The report advises against waiting for the situation to become urgent, emphasizing that safely executing transitions across blockchains, wallets, and exchanges could take years. Certain assets may be more vulnerable than others, such as Bitcoin wallets that have already revealed their public keys. Fortunately, quantum-resistant cryptography already exists and is being standardized by NIST. However, implementing this cryptography is not straightforward, as post-quantum digital signatures can be significantly larger than current ones, potentially increasing blockchain data costs and reducing throughput. The report outlines multiple transition strategies, including hybrid systems that combine existing cryptography with post-quantum updates, to facilitate a gradual switch when needed. For the time being, the authors recommend adopting flexible approaches that avoid compromising current security or performance while enabling rapid upgrades later. Ultimately, the report concludes that the time to begin preparing for the quantum computing threat is now.