Quantum Computing Poses Looming Threat to Crypto, According to Coinbase Advisory Board

A newly released report commissioned by Coinbase serves as a warning to the crypto industry: although quantum computing does not currently pose an immediate threat, the industry cannot afford to delay in preparing for this eventuality. The report, authored by a prominent advisory board comprising notable cryptographers and academics, stresses that while today's blockchains remain secure, the advent of a fault-tolerant quantum computer capable of breaking widely used encryption is a growing concern. 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 have proposed new digital signature types designed to be safe against quantum computers, while Solana and others are exploring quantum-resistant wallet designs. The report highlights that current quantum machines are still far from being powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, requiring vast computational overhead. However, the authors caution against complacency, emphasizing that a large-scale, fault-tolerant quantum computer will eventually be built, with an uncertain but looming timeline. This uncertainty is problematic, 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 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. Some 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 the U.S. National Institute of Standards and Technology. However, the transition will not be straightforward, with post-quantum digital signatures potentially being tens to hundreds of times larger than current ones, leading to increased blockchain data costs and reduced 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. Ultimately, the report concludes that the time to begin preparing for the quantum threat is now.