Breakthrough in Quantum Attack: Researcher Claims 1 Bitcoin Bounty

The threat of quantum attacks on cryptocurrency has become more tangible, as a researcher has successfully broken a 15-bit elliptic curve key on publicly accessible quantum hardware, earning a 1 bitcoin bounty. This achievement, made by Giancarlo Lelli, marks a significant milestone in the field of quantum computing and its potential impact on the security of cryptocurrencies like Bitcoin and Ethereum. The broken key is a crucial component of elliptic curve cryptography, which is used to secure funds in crypto wallets without revealing private keys. However, the use of quantum computers running Shor's algorithm challenges this security by potentially deriving private keys from public ones. While Lelli's achievement does not pose an immediate threat to Bitcoin, which uses 256-bit elliptic curve security, it demonstrates the rapid progress being made in quantum attacks. The previous public break was a 6-bit demonstration, and Lelli's 15-bit result represents a 512-fold increase in just seven months. Theoretical estimates suggest that the resource requirements for a full 256-bit attack are decreasing, with some predictions putting the cost below 500,000 physical qubits. This has significant implications for the security of cryptocurrencies, particularly for wallets with public keys already visible on-chain, estimated to be around 6.9 million bitcoin. In response, developers have proposed migration paths, including the introduction of quantum-safe address types, to mitigate the risks associated with quantum attacks.