Quantum Breakthrough Demonstrates ECC Key Attack on Bitcoin

On April 24, Project Eleven honored researcher Giancarlo Lelli with its Q-Day Prize for successfully demonstrating an attack on elliptic curve cryptography (ECC) using publicly accessible quantum hardware. Lelli was able to derive a 15-bit elliptic curve private key from its corresponding public key, marking a significant point in the conversation about quantum threats to cryptocurrencies like Bitcoin and Ethereum.

The demonstration is notable as it represents the largest public attempt to showcase a potential vulnerability in systems secured by ECC, although it’s essential to clarify that a 15-bit key offers nowhere near the security level of Bitcoin’s 256-bit elliptic curve. As it stands, no known quantum computer possesses the capability to compromise actual Bitcoin wallets at this time.

TRUSTED PARTNER

5.0 ★★★★★

Review and Opinions →

🔥 Bonus 2.400 $

Bonus Instant + 150 FS 🏆

Open an account

In this recent achievement, Lelli employed a variant of Shor’s algorithm, which is specifically designed to tackle the elliptic-curve discrete logarithm problem, the mathematical structure underpinning Bitcoin’s signature scheme. His work primarily aimed to break the largest ECC key possible using a quantum computer, following strict rules against using classical shortcuts.

Project Eleven characterized Lelli’s success as a 512-fold improvement over a previous demonstration by Steve Tippeconnic, who had managed to derive a 6-bit key back in September 2025. This recent exposition relied on a quantum machine with approximately 70 qubits, a fact verified by an independent panel of researchers.

The achievement can be compared to picking a toy lock, which utilizes similar methods that could eventually be applied to more secure vaults. The locksmithing techniques have made advancements, but the vaults are still secure for now.

Contextually, this milestone comes at a time of heightened concern, particularly following Google’s recent publication regarding elliptic curve discrete logarithm problems (ECDLP). Google indicated that future circuits could operate on a quantum computer with far fewer physical qubits than previously thought necessary, leading experts to reassess the timeline for quantum threats.

Notably, a potential risk to Bitcoin emerges when considering that approximately 6.9 million BTC are currently vulnerable to quantum attacks. This vulnerability mainly affects older address types and transactions where public keys are revealed, creating exposure that could be exploited in future cryptographic advancements.

TRUSTED PARTNER

4.4 ★★★★☆

Review and Opinions →

🔥 100% up to 1 BTC

180 Free Spins 🏆

Open an account

As a response to these emerging risks, Bitcoin governance is now considering proposals like BIP 360, aimed at evolving key structure and output types to mitigate quantum vulnerabilities. The ongoing discussions show that the Bitcoin community is beginning to recognize the need for proactive measures against the evolving threat landscape posed by quantum technology.

Looking ahead, two potential scenarios emerge. In an optimistic view, the migration to more secure cryptographic practices could be established before any major incidents occur, maintaining public confidence in the ecosystem. Conversely, should technical advancements in quantum computing outpace the governance response, the situation may quickly shift towards urgency, potentially undermining public trust and prompting chaotic shifts in wallet security.

Ultimately, the demonstration signifies a crucial development in understanding the quantum threat landscape, reminding stakeholders that while they remain quite distant from being practically threatened, the timeline for potential quantum vulnerabilities is becoming more compressed.