Grayscale, a digital asset manager, has emphasized the need for accelerated efforts to make public blockchains resistant to quantum computing threats. In a recent research note, the company argues that the technical solutions for achieving quantum resistance already exist, but the main challenge is garnering consensus among decentralized communities to implement these solutions. This comes after Google Quantum AI published a paper highlighting that breaking Bitcoin's elliptic curve cryptography could be achieved with fewer than 500,000 physical qubits, significantly lowering the estimated threshold. The research note outlines four key takeaways from Google's findings, including the potential for discrete jumps in progress toward a cryptographically relevant quantum computer, the maturity of post-quantum cryptography, varying quantum risk across different blockchains, and the unpredictability of timelines.
Grayscale's research suggests that 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 company identifies a significant challenge in determining the course of action for the approximately 6.9 million BTC in wallets with exposed public keys, including an estimated 1 million coins 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 distinct quantum-related challenges, with five identified attack vectors worth over $100 billion in combined exposure, prompting the Ethereum Foundation to stake substantial amounts of ether into validators.