Bitcoin
Bitcoin Network Evaluates Technical Mitigations Against Potential Quantum Computing Risks
Recent developments highlight protocol proposals, post-quantum transaction cost reductions, and institutional custody plans for Bitcoin security.
Discussions surrounding quantum computing risks to Bitcoin have gained practical focus as researchers and developers assess cryptographic defenses against Shor's algorithm. A sufficiently capable quantum machine could theoretically derive private keys from exposed public keys, compromising Bitcoin's elliptic curve cryptography.
Mitigation progress includes a reduction in the estimated cost of a StarkWare post-quantum transaction from $320 to $67 within seven days, though this protection only covers addresses where the public key has never been published on-chain. On the protocol level, two Bitcoin Improvement Proposals (BIPs) are under consideration to introduce post-quantum signatures, which could eventually include freezing unmigrated legacy balances. In parallel, Coinbase has outlined backup hardware strategies for institutional multi-party computation custody.
Estimates regarding the timeline and hardware requirements for breaking elliptic curve cryptography continue to adjust. Research from Google Quantum AI indicated that fewer than one million noisy qubits could crack a standard key in under a week, compared to twenty million estimated in 2019, while logic-qubit requirements on tracking resources such as ecdsa.fail have also been revised downwards.
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