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, a crucial component of cryptographic security. This achievement, made possible by independent researcher Giancarlo Lelli, has earned him a 1 bitcoin bounty, approximately $78,000. The breakthrough, facilitated by publicly accessible quantum hardware, demonstrates a significant leap in quantum computing capabilities, with a 512-fold increase over the previous public demonstration. Elliptic curve cryptography, which underpins the security of various cryptocurrencies, including Bitcoin and Ethereum, relies on the difficulty of deriving a private key from its corresponding public key. However, the advent of quantum computers, armed with Shor's algorithm, poses a substantial threat to this security paradigm. While Lelli's achievement does not immediately jeopardize the security of cryptocurrencies, which typically employ 256-bit elliptic curve security, it highlights the rapid progress being made in quantum computing. The previous record, set by Steve Tippeconnic in September 2025, involved a 6-bit demonstration, which Lelli's result has significantly eclipsed. The implications of this breakthrough are far-reaching, with estimates suggesting that the resource requirements for a full 256-bit attack are decreasing rapidly, potentially rendering such an attack more feasible in the near future. As a result, cryptocurrency developers are accelerating their efforts to transition to quantum-safe address types, with proposals such as BIP-360 aiming to mitigate the risks associated with quantum attacks. The concern is particularly pressing for wallets with publicly visible keys, which could be vulnerable to quantum attacks, with approximately 6.9 million bitcoin, or one-third of the total supply, potentially at risk.