Quantum computer cracks 15-bit elliptic curve key in landmark attack — Bitcoin's cryptographic future under scrutiny!

Independent researcher Giancarlo Lelli has derived a 15-bit elliptic curve key using a publicly accessible quantum computer, claiming the top prize in Project Eleven's Bitcoin cryptography challenge. The feat has been described as the largest quantum attack of its kind to date.

While Bitcoin's secp256k1 curve uses 256-bit keys — orders of magnitude beyond what today's quantum hardware can threaten — the milestone is a meaningful benchmark. Each incremental advance in quantum key-breaking narrows the theoretical gap between current capability and the key sizes that actually protect on-chain funds.

The result is likely to intensify calls within the Bitcoin development community for accelerated research into post-quantum cryptographic standards, a conversation that has been building quietly for several years but now has a concrete data point to anchor it.