A recent report commissioned by Coinbase raises an urgent yet measured warning: while quantum computing won’t compromise crypto tomorrow, the industry must start planning now. Penned by a panel of experts including Stanford University’s Dan Boneh, Justin Drake from the Ethereum Foundation, and Sreeram Kannan of Eigen Labs, the 50-page document highlights that current blockchains are secure, but the emergence of a ‘fault-tolerant quantum computer’ capable of cracking prevalent encryption is becoming more likely. Consequently, proactive measures are crucial.
Recently, mainstream discussions have begun to recognize quantum risk concerns, highlighted by Google researchers who estimate that advanced quantum computers could eventually compromise Bitcoin’s cryptography.
Major crypto platforms like the Ethereum Foundation and Solana are proactively addressing this threat. The Ethereum Foundation suggests new digital signatures resistant to quantum computing, while Solana is exploring quantum-resistant wallet designs.
Despite these efforts, the report confirms that present-day quantum devices lack the capability to break encryption for Bitcoin, Ethereum, and other networks. Overcoming standard cryptography would necessitate significant computational resources, a feat still seen as an immense engineering challenge.
Nevertheless, the authors warn against complacency, asserting with high confidence that building a large-scale, fault-tolerant quantum computer is inevitable, though its timeline remains uncertain but imminent.
The unpredictability of this timeline, estimated to span from a few years to over a decade, presents a critical issue. The urgency is echoed by the U.S. National Institute of Standards and Technology (NIST), which advises transitioning to quantum-resistant cryptography by 2035—a target deemed possibly optimistic in the report.
“Waiting until it’s too late isn’t advisable,” emphasizes the Coinbase document, noting that blockchain transitions could be prolonged processes.
Certain assets may face heightened risks. For instance, Bitcoin wallets with exposed public keys are more susceptible, whereas those shielded by hash functions might remain safer temporarily.
On a positive note, quantum-resistant cryptography (PQC) exists and is being standardized by NIST. However, its implementation poses challenges; post-quantum digital signatures can significantly increase in size, potentially inflating blockchain data costs and decreasing throughput. The report estimates that current signatures replaced with quantum-proof alternatives might expand block sizes up to 38 times.
Usability issues also arise, such as migrating millions of wallets and addressing ‘lost’ or inactive funds that don’t upgrade.
Instead of a singular approach, the report suggests various transition strategies, like hybrid systems blending existing cryptography with post-quantum updates or allowing gradual changes. Presently, it recommends adaptable methods that maintain current security and performance while facilitating swift future upgrades.
“The time to start preparing is now,” concludes the report.