Grayscale, a digital asset manager, has emphasized the need for accelerated efforts to make public blockchains resistant to quantum computing attacks in a recent research note. Although the technical pathways to achieve this are clear, the main hurdle lies in achieving consensus within decentralized communities to implement these solutions.
This comes after Google Quantum AI released a paper suggesting that breaking Bitcoin's elliptic curve cryptography could be achieved with fewer than 500,000 physical qubits, potentially in under nine minutes. The research note highlights four key takeaways from Google's findings, including the unpredictable nature of progress toward a quantum computer, the maturity of post-quantum cryptography, varying quantum risk across different blockchains, and the lower quantum risk associated with Bitcoin due to its UTXO model and proof-of-work consensus. However, the major challenge is deciding what to do with the approximately 6.9 million BTC in wallets with publicly exposed keys, including those believed to belong to Satoshi Nakamoto.
Possible solutions include burning these coins, taking no action, or limiting their release rate. The Bitcoin community's history of contentious debates over protocol changes may hinder the decision-making process. In contrast, Ethereum faces significant exposure to quantum attacks, with five identified vulnerabilities worth over $100 billion, prompting the Ethereum Foundation to stake substantial amounts of ether into validators, although a public timeline for quantum migration has not been announced.