Breakthrough in Quantum Attack: Researcher Claims 1 Bitcoin Bounty

The threat of quantum attacks on cryptocurrency has become more tangible, as evidenced by the recent achievement of independent researcher Giancarlo Lelli. Lelli was awarded a 1 bitcoin bounty, valued at approximately $78,000, by quantum security startup Project Eleven for breaking a 15-bit elliptic curve key on publicly accessible quantum hardware. This breakthrough demonstrates a 512-fold increase in capability compared to the previous public demonstration in September 2025. The implications of this achievement are significant, as it brings attention to the potential vulnerabilities of bitcoin and other cryptocurrencies to quantum attacks. Elliptic curve cryptography, which underpins the security of these currencies, relies on the difficulty of deriving a private key from a public key. However, quantum computers utilizing Shor's algorithm can potentially exploit this, posing a threat to the security of funds. Although Lelli's achievement does not immediately compromise the security of bitcoin, which uses 256-bit elliptic curve security, it highlights the rapid progress being made in quantum computing. The previous public break was a 6-bit demonstration, 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 some predictions putting the cost below 500,000 physical qubits. This has significant implications for wallets with public keys visible on-chain, with approximately 6.9 million bitcoin potentially at risk. In response, bitcoin developers are exploring migration paths, including the proposal of quantum-safe address types. The achievement serves as a reminder of the need for vigilance and innovation in the face of emerging quantum threats.