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While Bitcoin developers scramble to find a solution and Ethereum prepares for 'Q-day,' Solana is trying to get ahead of that scenario.
Discussions around post-quantum cryptography have intensified across the industry in recent weeks, especially after new research from Google and academic collaborators suggested that such systems could one day break widely used encryption, potentially cracking systems like Bitcoin’s in minutes rather than years.
While Bitcoin developers scramble to find a solution and Ethereum prepares for the event, Solana is trying to get ahead of that scenario.
Cryptography firm Project Eleven has teamed up with the Solana Foundation to experiment with post-quantum security, technology designed to withstand quantum attacks that could render today’s cryptography obsolete. The early work is already surfacing a difficult reality: making Solana quantum-safe may come at the expense of the performance that defines it.
In practice, that effort has meant moving beyond theory and into live testing. Project Eleven has worked with the Solana ecosystem to model how the network would behave if its current cryptography were replaced, including deploying a test environment using quantum-resistant signatures — the digital keys that authorize transactions. The goal is not just to prove the technology works, but to understand what breaks when it’s pushed to scale.
The new, quantum-safe “signatures” that approve transactions are much larger and heavier than those used today, roughly 20 to 40 times larger, Project Eleven CEO Alex Pruden, who founded the project, after years in crypto and venture capital, brings a mix of military and industry experience to the problem, told CoinDesk. That means the network can handle far fewer transactions at once. In testing, a version of Solana using this new cryptography ran about 90% slower than it does today, Pruden said.
The early results show a clear tradeoff.
Solana may also face a more immediate structural challenge than its peers.
That tradeoff cuts directly at the heart of Solana’s design. The blockchain has built its reputation on high throughput and low latency, positioning itself as one of the fastest networks in crypto. But post-quantum cryptography — while more secure against future threats — comes with heavier data and computational requirements, making it harder to maintain those speeds.
“A quantum computer could pick any wallet and immediately start trying to recover the private key.”
Unlike Bitcoin and Ethereum, where wallet addresses are typically derived from hashed public keys, Solana exposes public keys directly. That difference matters in a quantum scenario. “In Solana, 100% of the network is vulnerable,” Pruden said.
Some developers in the Solana ecosystem, meanwhile, are looking at simpler, more immediate fixes. One example is something called ‘Winternitz Vaults’, which uses a different kind of cryptography that’s believed to be safer against quantum attacks. Instead of changing the entire network, these tools focus on protecting individual wallets, giving users a way to secure their funds now while bigger, system-wide upgrades are still being figured out.
Pruden, a former Army Green Beret, first became interested in Bitcoin while deployed in the Middle East, later worked at Coinbase and joined Andreessen Horowitz’s venture team on its first fund. He then became an early leader at privacy-focused blockchain Aleo before launching Project Eleven, a firm focused on preparing digital assets for what he calls “Q-day,” the moment quantum computers can break today’s cryptography.
Across crypto, that level of engagement remains rare. While some ecosystems, most notably Ethereum, have begun discussing long-term migration paths, concrete implementation has been limited.
Despite those hurdles, Solana has moved faster than much of the industry in at least one respect: experimentation. “There’s something tangible,” Pruden said. “We actually have a testnet with post-quantum signatures.” He added that the Solana Foundation “deserves credit for at least engaging and wanting to do the work.”
The broader challenge is not just technical, but social: upgrading cryptography in decentralized systems requires coordination across developers, validators, applications and users, all of whom must move in sequence.
For Pruden, the risk is that the industry waits too long to begin that process. “This is a tomorrow problem — until it’s today’s problem,” he said. “And then it takes four years to fix.”
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