Venture Eleven’s 1 BTC Q-Day Prize was meant to sharpen the talk over quantum threat to Bitcoin and different ECC-secured crypto property. As an alternative, a pointy critique from Google quantum researcher Craig Gidney has turned the competitors itself into the story.
In an April 25 weblog submit titled “The predictable failure of the QDay Prize,” Gidney, a analysis scientist on Google’s quantum computing staff, argued that the profitable submission didn’t meaningfully show progress towards a cryptographically related quantum assault. His central declare was blunt: the competition was structured round a benchmark that present quantum computer systems are poorly suited to measure.
Bitcoin’s Quantum Risk Debate Explodes
Venture Eleven had introduced yesterday that it awarded the Q-Day Prize to Giancarlo Lelli for breaking a 15-bit elliptic curve key on publicly accessible quantum {hardware}. The group described the consequence because the “largest quantum assault on elliptic curve cryptography up to now” and stated it represented a 512x soar from a previous 6-bit public demonstration.
For crypto markets, the framing mattered. Venture Eleven explicitly linked the consequence to the long-term safety assumptions behind Bitcoin, Ethereum, and greater than $2.5 trillion in ECC-secured digital property.
However Gidney argued that the check might have proved far lower than marketed. Gidney stated he was invited final yr to take part within the Q-Day Prize however declined as a result of he seen the premise as flawed. His first objection was that Shor’s algorithm requires quantum error correction for cryptographically significant cases.
“Present quantum computer systems expertise on the order of 1 error per thousand gates, however cryptographically related cases of Shor’s algorithm require billions of gates,” he wrote. “The one identified technique to cross this chasm is quantum error correction. There are promising quantum error correction experiments being accomplished, however finally quantum error correction continues to be a piece in progress.”
That distinction sits on the middle of the dispute. In Gidney’s view, working small non-error-corrected circuits doesn’t present a helpful proxy for breaking real-world ECC keys, as a result of the scaling habits is essentially totally different from the programs that will be wanted to threaten Bitcoin-scale cryptography.
His second objection was extra damaging for the prize consequence. Gidney argued that small Shor-style issues can seem to succeed even when the quantum {hardware} shouldn’t be contributing significant computational worth.The difficulty, he stated, resembles a joke paper he revealed for SIGBOVIK 2025, the place he claimed to issue all numbers as much as 255 utilizing a quantum laptop, solely to indicate that the identical success might be reproduced with randomness. He known as this the “Falling With Type” downside.
“For the close to future, the contribution of luck goes to massively outweigh any reliable contribution of the quantum laptop,” Gidney wrote, quoting the warning he stated he gave when declining to take part. “So I believe the winner in 2026 can be whoever did the perfect job at obfuscating how they made themselves unavoidably fortunate. You’re going to seek out your self in a philosophical debate, with 100K$ on the road, over the place precisely the road for a quantum laptop ‘actually’ breaking a secret’s.”
In accordance with Gidney, that’s successfully what occurred.
He pointed to work by GitHub person Yuval Adam, who reportedly changed the quantum calls within the profitable submission with random calls and located that the outcomes had been “indistinguishable” from the quantum model. Gidney stated the circuit development itself seemed legitimate, together with its implementation of the ELDPC circuit from Roetteler et al. 2017, however that this made the issue extra delicate reasonably than much less severe.
“You make an accurate circuit, you get the anticipated consequence, you rejoice… however you bought the correct reply for the mistaken motive,” he wrote. “It is a worry that each competent experimentalist is aware of of their bones. It’s why they don’t simply test that one thing works when it ought to work, they test that it breaks when it ought to break.”
Venture Eleven Defends The Broader Purpose
Venture Eleven framed the profitable consequence as a sensible demonstration of the assault class that would finally threaten Bitcoin and Ethereum. In an response, CEO Alex Pruden stated the submission confirmed that “the useful resource necessities for this kind of assault maintain dropping” and that the barrier to working such experiments was falling as a result of the work used cloud-accessible public {hardware} reasonably than non-public or national-lab programs.
The group additionally cited current theoretical useful resource estimates, together with Google’s April 2026 estimate of underneath 500,000 bodily qubits for a full 256-bit assault and a later Caltech and Oratomic paper that put the determine as little as 10,000 qubits in a neutral-atom structure. Venture Eleven argued that whereas the space from 15 bits to 256 bits stays massive, the hole is more and more an engineering downside reasonably than a elementary physics downside.
Pruden later acknowledged Gidney’s critique on X, writing that “small factoring issues are a really imperfect yardstick for Q-Day.” Nonetheless, he defended the aim of the competitors as an try and bridge a niche between quantum researchers who see speedy acceleration and cryptographers or Bitcoin builders who need stronger proof earlier than treating present programs as near-term susceptible.
“So, since small factoring issues aren’t a great yardstick for Q-Day, then what’s?” Pruden wrote. “I’ll fortunately take suggestions on how we will higher incentivize open benchmarking in the direction of Q-Day threat.”
A Credibility Downside For Quantum Danger Messaging
Gidney didn’t dismiss quantum threat to crypto outright. In truth, he wrote that there are “reliable issues” quantum computer systems may turn out to be cryptographically related earlier than the top of the last decade, pointing to post-quantum migration efforts at firms similar to Google and Cloudflare.
His argument was narrower, however consequential: a weak benchmark can undermine the case it’s attempting to make. If a contest designed to boost consciousness produces a consequence that critics can reproduce with randomness, it dangers turning into ammunition for skeptics reasonably than a warning sign for the business.
At press time, BTC traded at $77,750.
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