Grayscale, a digital asset management firm, has emphasized the need for accelerated efforts to make public blockchains more resistant to quantum computing threats. In a recent research note, the company asserts that while the technical solutions to this problem are already available, the main obstacle is convincing decentralized communities to implement these changes. This comes after a significant industry response to a Google Quantum AI paper, which suggested that breaking Bitcoin's elliptic curve cryptography could be achieved with fewer than 500,000 physical qubits, a substantial reduction from previous estimates, and could potentially be executed in under nine minutes.
Following the release of this paper, CoinDesk's analysis revealed that such an attack could give an attacker a roughly 41% chance of stealing funds before a Bitcoin transaction is confirmed. Grayscale's note highlights four key takeaways from the Google research, including the unpredictable nature of progress toward a cryptographically relevant quantum computer, the maturity of post-quantum cryptography, the variability of quantum risk across different blockchains, and the lower quantum risk associated with Bitcoin due to its UTXO model and proof-of-work consensus mechanism. However, the more complex 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. Options include burning these coins, taking no action, or limiting their release.
This decision is complicated by Bitcoin's history of contentious debates over protocol changes, differing from the situation with Ethereum, which faces multiple attack vectors worth over $100 billion in combined exposure and has been taking steps such as staking ether into validators to prepare for potential quantum computing threats.