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

The crypto industry has been cautioned about the impending threat of quantum computing, with a new report warning that while current blockchains are secure, the emergence of a powerful quantum computer could compromise widely used encryption. The report, commissioned by Coinbase and authored by prominent cryptographers and academics, emphasizes that preparation is essential to mitigate this risk. Google researchers have estimated that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography, prompting major crypto ecosystems to begin developing responses. The Ethereum Foundation has proposed new digital signatures designed to be safe against quantum computers, while Solana and others are exploring quantum-resistant wallet designs. Although current quantum machines are not powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, the report stresses that complacency is not an option. The authors caution 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 migrating to quantum-resistant cryptography by 2035, a timeline that may prove optimistic. The report suggests that waiting for the threat to become urgent is not a viable strategy, as 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 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 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.