Grayscale, a digital asset management firm, has come out in support of accelerating efforts to make public blockchains resistant to quantum computing, citing the existence of technical solutions but highlighting the difficulty in achieving consensus among decentralized communities for their implementation. This stance follows a week of intense industry reactions to a paper by Google Quantum AI, which revealed that compromising bitcoin's elliptic curve cryptography would require less than 500,000 physical qubits, a significant reduction from previous estimates, and could be achieved in approximately nine minutes. The paper's findings have sparked discussions on the potential risks and the need for quantum-resistant measures.
Grayscale's research note outlines persuasive takeaways from the Google research, including the unpredictable nature of progress toward a cryptographically relevant quantum computer, the maturity of post-quantum cryptography solutions, and the varying levels of quantum risk across different blockchains. The note also emphasizes the lower quantum risk associated with bitcoin due to its UTXO model, proof-of-work consensus, and lack of native smart contracts. However, the more challenging issue is determining the course of action for the approximately 6.9 million BTC in wallets with permanently exposed public keys on the blockchain, including those believed to belong to Satoshi Nakamoto. Possible solutions, such as burning these coins, taking no action, or limiting their release, are complicated by the history of contentious debates within the bitcoin community over protocol changes.
In contrast, Ethereum faces distinct challenges, with multiple identified attack vectors worth over $100 billion and a significant risk of quantum key recovery by 2032, prompting the Ethereum Foundation to stake substantial amounts of ether into validators.