Grayscale, a digital asset management firm, has released a research note advocating for expedited efforts to make public blockchains resistant to quantum computing. The note emphasizes that although technical solutions to this issue already exist, the primary obstacle lies in gaining consensus among decentralized communities to implement these solutions.
This comes in response to a recent paper by Google Quantum AI, which suggested that breaking Bitcoin's elliptic curve cryptography could potentially be achieved with fewer than 500,000 physical qubits, significantly less than previous estimates, and could be executed in approximately nine minutes. The paper's findings have sparked intense discussion within the industry, with CoinDesk's analysis indicating that such an attack could give an attacker a roughly 41% chance of stealing funds before a Bitcoin transaction is confirmed. Grayscale's research highlights four key takeaways from Google's findings, including the potential for progress toward a cryptographically relevant quantum computer to occur in unpredictable, discrete jumps, and the maturity of post-quantum cryptography solutions.
Furthermore, the research notes that Bitcoin's use of a UTXO model, proof-of-work consensus, and lack of native smart contracts contributes to its relatively lower quantum risk compared to other blockchains. However, the handling of approximately 6.9 million BTC in wallets with permanently exposed public keys on the blockchain, including an estimated 1 million coins believed to belong to Satoshi Nakamoto, poses a significant governance challenge.
Potential solutions, such as burning these coins, taking no action, or limiting their release, are complicated by the Bitcoin community's history of contentious debates over protocol changes. In contrast, Ethereum faces distinct challenges, with Google's paper identifying multiple attack vectors worth over $100 billion in combined exposure.
As the industry navigates these complex issues, the need for consensus and effective governance in addressing quantum computing risks has become increasingly apparent.