Breakthrough in Quantum Attack: Researcher Claims 1 Bitcoin Bounty

The potential threat of quantum attacks to Bitcoin's security has become more tangible with the latest achievement by Giancarlo Lelli, an independent researcher. Lelli was awarded 1 bitcoin, valued at approximately $78,000, for breaking a 15-bit elliptic curve key using publicly accessible quantum hardware. This feat is considered the largest public demonstration of its kind and underscores the growing concern over the vulnerability of elliptic curve cryptography to quantum attacks. Elliptic curve cryptography is fundamental to the security of Bitcoin and other cryptocurrencies, as it enables wallets to prove control over funds without revealing private keys. However, quantum computers, utilizing algorithms like Shor's, pose a challenge to this security by potentially deriving private keys from public ones. Lelli's achievement, while significant, does not immediately threaten Bitcoin, as it uses 256-bit elliptic curve security, far beyond the 15-bit key broken. Nonetheless, this breakthrough indicates that quantum attacks are progressing from theoretical concepts to practical, publicly accessible hardware experiments. The previous record was a 6-bit demonstration, and Lelli's result marks a 512-fold increase in just seven months. Theoretical estimates suggest that the resource requirements for a full 256-bit attack are decreasing rapidly, with a recent Google Research paper indicating the cost could be below 500,000 physical qubits. This has significant implications for Bitcoin and other cryptocurrencies, particularly for wallets with publicly visible keys, estimated to hold around 6.9 million bitcoin. Developers are exploring migration paths to quantum-safe address types, such as BIP-360 for Bitcoin, to mitigate these risks.