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 breakthrough achieved by independent researcher Giancarlo Lelli. Lelli was awarded a 1 bitcoin bounty, valued at approximately $78,000, for successfully breaking a 15-bit elliptic curve key on publicly accessible quantum hardware. This feat marks a significant milestone, being 512 times larger than the previous public demonstration in September 2025. The implications of this breakthrough are substantial, as it underscores the potential vulnerability of cryptocurrencies such as Bitcoin and Ethereum to quantum attacks. Elliptic curve cryptography, the underlying math that enables crypto wallets to prove fund control without revealing private keys, is being challenged by quantum computers utilizing Shor's algorithm. Although Lelli's achievement does not immediately jeopardize Bitcoin, which relies on 256-bit elliptic curve security, it highlights 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 significant expansion. Theoretical estimates suggest that the resource requirements for a full 256-bit attack are decreasing, with a recent Google Research paper estimating the cost to be below 500,000 physical qubits. This has significant implications for wallets with publicly visible keys, with approximately 6.9 million bitcoin, or one-third of the total supply, potentially at risk. In response, developers are exploring migration paths, including the proposed BIP-360, which would introduce quantum-safe address types. The achievement serves as a reminder of the urgency to address quantum security concerns in the cryptocurrency space.