A new position paper from Coinbase’s independent advisory board has warned that quantum computing poses a long-term threat to blockchain security, urging the industry to begin preparing now rather than waiting for the risk to become imminent. The advisory panel featuring leading experts such as Scott Aaronson, Dan Boneh, Justin Drake, Sreeram Kannan, Yehuda Lindell, and Dahlia Malkhi stops short of predicting when a quantum computer capable of breaking modern encryption will arrive. However, it emphasizes that the possibility is credible enough to demand immediate preparation.

The warning centers on how leading cryptocurrencies like Bitcoin and Ethereum rely on public-key cryptography, particularly elliptic-curve systems, to secure transactions. These systems are considered effectively unbreakable by classical computers but could be compromised by sufficiently advanced quantum machines using Shor’s algorithm, which can efficiently derive private keys from public ones.

If such a machine becomes viable, attackers could potentially access exposed wallet addresses and drain funds. The paper estimates that millions of Bitcoin worth hundreds of billions of dollars are currently held in wallets where public keys are visible, making them theoretically vulnerable in a post-quantum scenario.

Despite the concern, the notes that not all aspects of blockchain are equally at risk. Mining mechanisms based on hash functions are less vulnerable, as quantum speedups in that domain are limited compared to those affecting digital signatures. The primary exposure lies in transaction authorization systems.

The advisory board highlights that building a quantum computer capable of executing such attacks remains a major engineering challenge. Current systems, even those developed by companies like Google and IBM, are still far from achieving the scale and error correction required for real-world cryptographic attacks. However, ongoing progress suggests the threat cannot be dismissed. To address the risk, the panel recommends adopting post-quantum cryptography (PQC), aligning with guidance from the National Institute of Standards and Technology, which has urged organizations to transition to quantum-resistant algorithms by 2035. These include newly standardized methods such as ML-DSA and SLH-DSA.

However, implementing these solutions presents technical challenges. Post-quantum signatures are significantly larger and slower than current cryptographic methods, potentially reducing blockchain efficiency and increasing costs. To balance security and performance, the panel proposes a hybrid approach known as “1-of-2 signing,” allowing systems to support both classical and quantum-resistant signatures until a full transition is necessary.

The also raises complex governance issues, particularly around inactive or inaccessible wallets. Decisions will need to be made on whether to revoke such assets after migration deadlines or leave them exposed to potential future attacks both options carrying economic and ethical implications.

Different blockchain networks are already exploring solutions. Ethereum is developing a detailed migration roadmap, while other platforms are experimenting with quantum-resistant transactions and wallet designs. At the same time, Bitcoin developers are taking a more cautious approach, focusing on incremental changes to reduce exposure. The advisory board concludes that while the timeline for a quantum breakthrough remains uncertain, the industry must act proactively. Delaying preparation could leave digital assets vulnerable, while early planning offers a path to secure blockchain systems against one of the most significant technological shifts on the horizon.

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