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

A newly released report, commissioned by Coinbase and authored by a panel of renowned cryptographers and academics, sounds a warning about the potential dangers of quantum computing to the world of cryptocurrency. While the report acknowledges that current blockchains are secure, it stresses that the advent of a fault-tolerant quantum computer capable of breaking widely used encryption is becoming increasingly plausible, making it essential to start preparing now. In light of recent estimates by Google researchers suggesting that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography, major crypto ecosystems have begun outlining their responses, with the Ethereum Foundation proposing new digital signatures designed to be safe against quantum computers, and Solana and others experimenting with quantum-resistant wallet designs. The report emphasizes that while current quantum machines are not yet powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, complacency is not an option. With estimates suggesting that a large-scale, fault-tolerant quantum computer could be built anywhere from a few years to a decade or more from now, the authors caution against waiting until it's too late, citing guidance from the U.S. National Institute of Standards and Technology (NIST) that recommends migrating to quantum-resistant cryptography by 2035. The report highlights the challenges of transitioning to quantum-resistant cryptography, including the potential for increased blockchain data costs and reduced throughput, as well as usability challenges such as migrating millions of wallets and deciding what to do with 'lost' or inactive funds that never upgrade. Rather than a single solution, the report outlines multiple transition strategies, including hybrid systems that combine existing cryptography with post-quantum updates or allow a gradual switch when needed. Ultimately, the authors recommend flexible approaches that avoid sacrificing current security or performance while enabling a rapid upgrade later, stressing that the time to begin preparing for the potential threats posed by quantum computing is now.