Grayscale, a digital asset management firm, has published a research note advocating for expedited efforts to make public blockchains resistant to quantum computing. The note emphasizes that although technical solutions to achieve quantum resistance already exist, the primary hurdle lies in securing decentralized communities' agreement on their implementation.
This follows a recent industry response to a Google Quantum AI paper, which revealed that breaking bitcoin's elliptic curve cryptography could be accomplished with fewer than 500,000 physical qubits, a 20-fold reduction from prior estimates, and could be executed in approximately nine minutes. The attack poses a roughly 41% chance of stealing funds before a bitcoin transaction is confirmed. The research highlights four key takeaways, including the potential for progress toward a cryptographically relevant quantum computer to occur in discrete jumps, rendering timelines unpredictable.
It also notes that post-quantum cryptography is already mature and securing internet traffic and certain blockchain transactions. However, the main challenge lies in determining the course of action for the approximately 6.9 million BTC in wallets with publicly exposed keys on the blockchain, including an estimated 1 million believed to belong to Satoshi Nakamoto. Possible solutions include burning these coins, taking no action, or deliberately slowing their release by limiting the spending rate from vulnerable addresses. The bitcoin community's history of contentious debates over protocol changes may hinder the decision-making process.
In contrast, Ethereum faces distinct challenges, with five identified attack vectors worth over $100 billion in combined exposure. An Ethereum Foundation researcher estimates a 10% chance of quantum key recovery by 2032, underscoring the need for timely action.