Researcher Claims 1 Bitcoin Prize for Achieving Largest Quantum Attack on Underlying Technology

The threat of quantum attacks on bitcoin has become more tangible with the latest achievement of independent researcher Giancarlo Lelli, who has been awarded 1 bitcoin, valued at approximately $78,000, for breaking a 15-bit elliptic curve key on publicly accessible quantum hardware. This breakthrough, facilitated by quantum security startup Project Eleven, marks the largest public demonstration of its kind, outpacing the previous record by a factor of 512. The implications of this achievement are significant, as it underscores the potential vulnerability of bitcoin and other major blockchains to quantum attacks. Elliptic curve cryptography, which is foundational to the security of crypto wallets, relies on the principle that deriving a private key from its public counterpart is computationally infeasible. However, quantum computers, leveraging algorithms like Shor's, pose a formidable challenge to this assumption. Lelli's feat, while not an immediate threat to bitcoin's 256-bit elliptic curve security, signals a substantial leap in the capability to execute quantum attacks on real-world cryptographic systems. The previous public demonstration, a 6-bit break by Steve Tippeconnic in September 2025, has been eclipsed by Lelli's 15-bit achievement, indicating a rapid advancement in the field. This progression is further highlighted by recent estimates suggesting the cost of a full 256-bit attack could be lower than 500,000 physical qubits, a significant decrease from earlier projections. The concern is particularly acute for wallets with publicly visible keys, with approximately 6.9 million bitcoin, or one-third of the total supply, potentially at risk. In response, proposals for migration to quantum-safe address types, such as BIP-360 for Bitcoin, and post-quantum transition plans by Ethereum, Tron, StarkWare, and Ripple, are being explored. While the 15-bit break is far from the 256-bit security used by bitcoin, it represents a critical milestone in the escalating race between quantum computing capabilities and cryptographic security.