Quantum Computing Threat to Crypto on the Horizon, According to Coinbase Advisory Board

The crypto industry has been cautioned about the potential threat of quantum computing, with a new report highlighting the need for a plan to mitigate this risk. The report, commissioned by Coinbase, emphasizes that while today's blockchains are secure, the possibility of a future quantum computer breaking widely used encryption is becoming more plausible. As a result, preparation must begin immediately. Recent months have seen concerns around quantum risk gain more attention, with Google researchers suggesting that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography. In response, major crypto ecosystems have started developing strategies to address this issue, such as proposing new types of digital signatures that are safe against quantum computers. The report stresses that current quantum machines are not powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, but it cautions against complacency, emphasizing that a large-scale, fault-tolerant quantum computer will eventually be built. The timeline for this is uncertain, but it is 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 good idea, as transitions across blockchains, wallets, and exchanges could take years to execute safely. Some assets may be more vulnerable than others, and the report highlights the need for a flexible approach that avoids sacrificing current security or performance while enabling a rapid upgrade later. Quantum-resistant cryptography already exists and is being standardized, but it is not an easy swap, with post-quantum digital signatures being tens to hundreds of times larger than current ones, which could increase blockchain data costs and reduce 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 computing threat is now.