Grayscale, a digital asset management firm, has released a research note advocating for accelerated efforts to render public blockchains resistant to quantum computing. The note posits that although technical solutions to this problem already exist, the more significant obstacle is convincing decentralized communities to adopt these solutions. This comes on the heels of a paper by Google Quantum AI, which suggested that breaking Bitcoin's elliptic curve cryptography could be achieved with fewer than 500,000 physical qubits and in under nine minutes, presenting a significant risk.
The paper's findings have sparked a wave of responses from the industry. Grayscale's research highlights four key takeaways from Google's paper, including the potential for sudden advancements in quantum computing capabilities, the maturity of post-quantum cryptography, the variability of quantum risk across different blockchains, and the unpredictability of timelines. The firm argues that from a purely technical standpoint, Bitcoin has a lower quantum risk compared to other chains due to its UTXO model, proof-of-work consensus, lack of native smart contracts, and certain address types. However, the more pressing issue is determining the course of action for 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 spending rate. Grayscale notes that the Bitcoin community has historically been divided on protocol changes, which could hinder the implementation of such solutions. In contrast, Ethereum faces distinct challenges, with multiple attack vectors worth over $100 billion in combined exposure, prompting the Ethereum Foundation to stake significant amounts of ether into validators, albeit without publicly disclosing quantum migration timelines.