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

A newly released report, commissioned by Coinbase, serves as a warning to the cryptocurrency industry: while quantum computing does not currently pose a threat to crypto, the sector cannot afford to delay in its preparations. The report, put together by an advisory board comprising notable cryptographers and academics, underscores that the development of a fault-tolerant quantum computer capable of breaking standard encryption is becoming increasingly plausible. As a result, the industry must begin making preparations now. Recent months have seen concerns about quantum risk move into the mainstream, with Google researchers suggesting that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography. In response, major crypto ecosystems have started outlining their strategies, including the Ethereum Foundation's proposal for new digital signatures safe against quantum computers and Solana's experimentation with quantum-resistant wallet designs. The report emphasizes that current quantum machines lack the power to crack the cryptography underlying Bitcoin, Ethereum, and other networks, requiring vast computational overhead that is still a significant engineering challenge. Nonetheless, the authors caution against complacency, stating that they have high confidence a large-scale, fault-tolerant quantum computer will eventually be built, with the timeline being uncertain but clearly on the horizon. This uncertainty is a problem, 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 the report suggests may 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. Certain assets may be more vulnerable than others, such as Bitcoin wallets with revealed public keys, while those protected behind hash functions may be safer in the short term. Quantum-resistant cryptography already exists and is being standardized, but it is not an easy swap, with post-quantum digital signatures being 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, and recommends flexible approaches that avoid sacrificing current security or performance while enabling a rapid upgrade later. Ultimately, the report concludes that the time to begin preparing for the quantum computing threat is now.