Experts Warn: Quantum Computing Poses Looming Threat to Cryptocurrency, Immediate Planning Required

A newly commissioned report by Coinbase serves as a warning to the crypto industry: while quantum computing does not currently pose an imminent threat, the sector cannot afford to delay in its preparations. The report, compiled by an advisory board comprising renowned cryptographers and academics, emphasizes that although existing blockchains remain secure, the emergence of a fault-tolerant quantum computer could potentially break widely used encryption methods, necessitating immediate planning. Recent estimates by Google researchers suggest that a sufficiently advanced quantum computer could potentially compromise Bitcoin's cryptography. In response, major crypto ecosystems have begun devising strategies to mitigate quantum risk, with the Ethereum Foundation proposing new digital signature types designed to be safe against quantum computers, and Solana experimenting with quantum-resistant wallet designs. The report highlights that current quantum machines lack the computational power 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, with the timeline uncertain but clearly on the horizon. The U.S. National Institute of Standards and Technology recommends transitioning to quantum-resistant cryptography by 2035, a timeline that may prove optimistic. The report urges the industry not to wait until the situation becomes urgent, as transitions across blockchains, wallets, and exchanges could take years to execute safely. Certain assets may be more vulnerable than others, with Bitcoin wallets that have already revealed their public keys potentially being targeted. Fortunately, quantum-resistant cryptography already exists and is being standardized by NIST. 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, and recommends flexible approaches that avoid sacrificing current security or performance while enabling rapid upgrades later.