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

The cryptocurrency industry has been cautioned about the impending threat of quantum computing, with a new report warning that the advent of a fault-tolerant quantum computer could potentially break the encryption used in cryptocurrencies. The report, commissioned by Coinbase, notes that while today's blockchains are still secure, the industry cannot afford to wait and must begin preparing for the future. Concerns around quantum risk have been growing, with Google researchers suggesting that a sufficiently advanced quantum computer could break Bitcoin's cryptography. In response, major crypto ecosystems such as the Ethereum Foundation and Solana are exploring new types of digital signatures and wallet designs that are resistant to quantum computers. The report emphasizes that current quantum machines are not yet powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, but cautions against complacency, stressing that a large-scale, fault-tolerant quantum computer will eventually be built. The timeline for this is uncertain, but it is clearly on the horizon, with estimates ranging from a few years to a decade or more. The U.S. National Institute of Standards and Technology recommends migrating to quantum-resistant cryptography by 2035, but the report suggests that this timeline may be optimistic. The urgency is reflected in the guidance, with the report emphasizing that waiting for it to be urgent is not a good idea and that transitions across blockchains, wallets, and exchanges could take years to execute safely. Some assets may be more vulnerable than others, with Bitcoin wallets that have already revealed their public keys potentially being targeted. However, quantum-resistant cryptography already exists and is being standardized by NIST. The challenge lies in implementing it, as post-quantum digital signatures can be tens to hundreds of times larger than current ones, which could increase blockchain data costs and reduce 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, emphasizing that the time to begin preparing for the quantum computing threat is now.