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

A newly released report, commissioned by Coinbase, serves as a warning to the cryptocurrency industry: although quantum computing does not currently pose a threat to crypto, the sector cannot afford to delay in preparing for this potential risk. The 50-page report, authored by a panel of prominent cryptographers and academics, including Dan Boneh, Justin Drake, and Sreeram Kannan, concludes that while today's blockchains remain secure, the possibility of a future fault-tolerant quantum computer breaking widely used encryption is growing, and preparation must begin now. Recent months have seen concerns about quantum risk moving into the mainstream, with Google researchers estimating that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography. In response, major crypto ecosystems have started developing strategies to address this risk. The Ethereum Foundation has proposed new digital signature types designed to be safe against quantum computers, while Solana and others are exploring quantum-resistant wallet designs. The report emphasizes that current quantum machines are not yet powerful enough to crack the cryptography underlying Bitcoin, Ethereum, and other networks, as breaking standard encryption would require significant computational overhead, a milestone still considered a major engineering challenge. However, the authors caution against complacency, stating that they have high confidence that a large-scale, fault-tolerant quantum computer will eventually be built, although the timeline is uncertain and 'clearly on the horizon.' This uncertainty is a major concern, with estimates ranging from a few years to a decade or more, and no reliable way to predict breakthroughs. The U.S. National Institute of Standards and Technology recommends migrating to quantum-resistant cryptography by 2035, a timeline that the report suggests may even prove optimistic. The report advises against waiting for the situation to become urgent, emphasizing that transitions across blockchains, wallets, and exchanges could take years to execute safely. Some assets may be more vulnerable than others, such as Bitcoin wallets that have already revealed their public keys, while those still protected behind hash functions may be safer in the short term. Fortunately, quantum-resistant cryptography already exists and is being standardized by NIST. However, the transition will not be easy, as post-quantum digital signatures can be tens to hundreds of times 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 or allow a gradual switch when needed. The authors recommend flexible approaches that avoid sacrificing current security or performance while enabling a rapid upgrade later, concluding that the time to begin preparing for the quantum computing threat is now.