Grayscale, a digital asset management firm, has published a research note emphasizing the need for accelerated efforts to make public blockchains resilient to quantum computing threats. The note underscores that although technical solutions to this problem already exist, the main obstacle lies in garnering consensus within decentralized communities to implement these solutions. This follows a recent industry response to a paper by Google Quantum AI, which suggested that breaking Bitcoin's elliptic curve cryptography could be achieved with fewer qubits than previously thought, potentially in under nine minutes.
The research highlights four key points from the Google paper that Grayscale finds compelling: the potential for sudden advancements in quantum computing, the maturity of post-quantum cryptography, the variation in quantum risk across different blockchains, and the unpredictability of timelines for developing a cryptographically relevant quantum computer. From a purely technical standpoint, Bitcoin is argued to have a lower quantum risk due to its UTXO model, proof-of-work consensus, and lack of native smart contracts.
However, the question of what to do with the approximately 6.9 million BTC in wallets with exposed public keys, including those believed to belong to Satoshi Nakamoto, poses a significant governance challenge. Options include burning these coins, taking no action, or limiting their spending rate.
This dilemma is further complicated by Bitcoin's history of contentious debates over protocol changes. In contrast, Ethereum faces a different set of 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.