Independent researcher Giancarlo Lelli derived a 15-bit elliptic curve key using a publicly accessible quantum computer, Project Eleven announced roughly one hour ago.
The feat won Lelli a 1 Bitcoin (BTC) bounty and set a record as the largest quantum attack on elliptic curve cryptography completed to date.
What Happened
Project Eleven runs an open bounty program aimed at stress-testing Bitcoin's cryptographic foundations.
The program invites researchers to attack progressively larger elliptic curve keys using real quantum hardware. Lelli targeted a 15-bit key, the largest successfully broken under this framework. Project Eleven confirmed the result and awarded the 1 BTC prize following verification of the derivation.
Elliptic curve cryptography secures Bitcoin wallets. A sufficiently powerful quantum computer could, in theory, derive private keys from public keys. The current milestone sits far below the 256-bit key size that Bitcoin actually uses.
Why 15 Bits Matters, and Why It Doesn't
Researchers broadly agree that breaking a 256-bit elliptic curve key requires a quantum computer orders of magnitude more capable than anything publicly available today. The gap between 15 bits and 256 bits is not incremental. Closing it would require millions of stable logical qubits, a threshold no machine has come close to reaching.
Still, Project Eleven treats these benchmarks as meaningful progress markers. Each successful attack on a larger key size moves the field's understanding of the threat timeline forward.
Background
Quantum computing's potential impact on Bitcoin has been debated in cryptography circles for over a decade. Earlier this year, concerns around quantum readiness re-entered mainstream crypto discussion as several hardware firms reported advances in qubit stability. Yellow.com covered related developments in Bitcoin's shifting macro correlations, including the (see prior Yellow coverage) Bitcoin logged against the dollar just two hours ago. The broader question of how Bitcoin's protocol would adapt to a credible quantum threat remains unresolved at the developer level.
Also Read: Why Bitcoin Won't Rally Before October, According To Scaramucci
What Comes Next
Project Eleven has not announced a next bounty tier. The organization is expected to publish a full technical writeup of Lelli's method. Developers within the Bitcoin community have previously discussed post-quantum signature schemes as a longer-term upgrade path, but no formal proposal has reached the implementation stage.
The record-breaking result keeps quantum cryptography risk on researchers' radar without triggering immediate alarm for Bitcoin holders today.
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