Experts Warn: Quantum Computing Poses Imminent Threat to Cryptocurrency, Calls for Immediate Action

The cryptocurrency industry has been cautioned about the impending threat of quantum computing, which could potentially compromise the security of blockchains. A 50-page report, compiled by a panel of experts including renowned cryptographers and academics, stresses that while current blockchains are secure, the advent of a fault-tolerant quantum computer could break widely used encryption methods. As a result, the industry must start preparing for this eventuality. Google researchers have estimated that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography, prompting major crypto ecosystems to begin developing countermeasures. The Ethereum Foundation has proposed new digital signature types that are resistant to quantum computers, while Solana and others are exploring quantum-resistant wallet designs. Although current quantum machines are not yet powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, the report warns against complacency. The authors emphasize that 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 major concern, 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 and recommends that transitions across blockchains, wallets, and exchanges be executed safely over the next few years. Some assets may be more vulnerable than others, with Bitcoin wallets that have already revealed their public keys being potential targets. However, quantum-resistant cryptography already exists and is being standardized by the National Institute of Standards and Technology. The challenge lies in implementing this new cryptography, as post-quantum digital signatures can be significantly 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 rapid upgrades later.