Breakthrough in Quantum Attack: Researcher Claims 1 Bitcoin Bounty

The threat of quantum attacks on cryptocurrency has become more tangible with a recent breakthrough by independent researcher Giancarlo Lelli. Lelli successfully broke a 15-bit elliptic curve key on publicly accessible quantum hardware, earning a 1 bitcoin bounty from quantum security startup Project Eleven. This achievement represents a 512-fold increase over the previous public demonstration and has significant implications for the security of major blockchains, including Bitcoin and Ethereum. Elliptic curve cryptography, which underpins the security of these networks, relies on the difficulty of deriving a private key from its corresponding public key. However, quantum computers running Shor's algorithm pose a challenge to this assumption, potentially threatening the integrity of these systems. While Lelli's result does not immediately compromise the security of Bitcoin, which uses 256-bit elliptic curve security, it highlights the rapid progress being made in quantum attacks. The previous public break was a 6-bit demonstration using IBM's 133-qubit quantum computer, and Lelli's 15-bit result marks a substantial leap forward. Theoretical estimates suggest that the resource requirements for a full 256-bit attack are decreasing, with a recent Google Research paper putting the cost below 500,000 physical qubits. This has significant implications for wallets with public keys already visible on-chain, with Project Eleven estimating that roughly 6.9 million bitcoin are at risk. In response, developers are exploring migration paths, including the introduction of quantum-safe address types, to mitigate the threat of quantum attacks.