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

The perceived threat of quantum attacks on cryptocurrency has become more tangible with the recent accomplishment of independent researcher Giancarlo Lelli, who successfully broke a 15-bit elliptic curve key using publicly accessible quantum hardware. This feat, recognized with a 1 bitcoin Q-Day Prize by quantum security startup Project Eleven, demonstrates a substantial leap in the capabilities of quantum attacks, with the broken key being 512 times larger than the previous public demonstration in September 2025. The bounty, valued at approximately $78,000, underscores the growing concern regarding the potential vulnerabilities of major blockchains, including Bitcoin and Ethereum, to quantum computer attacks. Elliptic curve cryptography, which enables crypto wallets to verify fund ownership without exposing private keys, is at the heart of this issue. The math behind it relies on the impracticality of deriving a private key from its public counterpart, a challenge that quantum computers, leveraging Shor's algorithm, are increasingly capable of overcoming. Although Lelli's achievement does not immediately jeopardize Bitcoin, given its use of 256-bit elliptic curve security, it signifies a notable advancement in the field. The previous record, set by Steve Tippeconnic in September 2025, involved a 6-bit demonstration, highlighting the rapid progress in quantum attacks. This development prompts a closer examination of the measures being taken to safeguard against such threats, including proposed migration paths like BIP-360 for Bitcoin, and post-quantum transition plans for other cryptocurrencies. As the barrier to executing these attacks continues to decrease, both in terms of theoretical resource estimates and practical accessibility of quantum hardware, the urgency for the cryptocurrency community to address these vulnerabilities grows.