Mentioned in This Article
1. Ethlabs bets on Ethereum quantum resistance by 2027
Ethlabs, a nonprofit Ethereum research lab founded by former Ethereum Foundation researchers, published a proposal called "pqai27" on November 11, 2026, arguing that Ethereum can reach quantum resistance, and plausibly resilience against AI-driven attacks, by 2027. To free up resources, the lab is withdrawing Quick Slots, its plan to shorten Ethereum's 12-second slot time, from the upcoming Hegotá fork.
The plan was posted on Ethereum Magicians, the open forum where researchers and client developers debate proposed changes to the protocol. Its central message is one of urgency: the lab believes the network should become post-quantum one to two years earlier than the timelines currently on the table.
That makes pqai27 one of the most aggressive security proposals to reach Ethereum's public roadmap discussion this year. It also forces a choice that core developers will have to confront: how much of the next upgrade should be devoted to defending against future threats, and how much to near-term improvements such as faster blocks.
2. Why Ethlabs says AI changes the timeline
Ethlabs frames artificial intelligence as the factor that compresses every security timeline at once. In its view, AI is accelerating three distinct risks: it may bring practical quantum computing closer than previously expected, it may produce mathematical breakthroughs capable of undermining the cryptography blockchains rely on, and it allows software bugs to be discovered at a scale no human team could match.
Each of those threats would be serious on its own. Together, the lab argues, they justify treating the post-quantum transition as an immediate engineering priority rather than a long-range project.
This is where the "post-AI" half of the proposal comes in. Ethlabs uses the term to describe two goals. The first is cryptography that depends on as few mathematical assumptions as possible, so there is less for an AI-assisted breakthrough to break. The second is hardening Ethereum's client software, the programs that run the network, so it can withstand automated, AI-driven bug hunting by attackers.
The client-hardening goal reflects a practical worry. Ethereum runs on several independent software implementations, which protects the network if one of them fails, but every one of those codebases is a potential target. If attackers can use AI tools to comb through code for weaknesses faster than developers can patch them, the defensive work has to start earlier and run deeper.
3. Is Ethereum quantum resistant today?
No. Ethereum is not yet quantum resistant. User accounts are secured by elliptic-curve digital signatures, and a sufficiently powerful quantum computer running known algorithms could in principle derive a private key from its public key, allowing an attacker to forge transactions and take funds.
The same class of risk extends to Ethereum's consensus layer, where validators use signature schemes to attest to blocks and agree on the state of the chain. If those signatures could be forged, an attacker could undermine the process by which the network finalizes transactions.
No quantum computer capable of breaking these schemes exists today, and estimates of when one might arrive vary widely. The difficulty is that migrating a large, live network that secures enormous value to new cryptography takes years of research, specification, testing and coordination. Developers therefore have to start well before the threat is real, and the debate centers on how much time they can safely assume they have.
4. What pqai27 would deliver: pqai-ready and pqai-scaled
Ethlabs splits its 2027 ambition into two levels. The first, which it calls "pqai-ready," would be delivered through the Hegotá fork. Under that milestone, Ethereum's consensus would run on post-quantum cryptography, and every account would gain the option of a post-quantum way to authorize transactions.
The point of pqai-ready is resilience. If today's cryptography were broken suddenly, the network would be able to keep operating rather than grinding to a halt, even if it could not yet run at full throughput with the new schemes.
The second level, "pqai-scaled," is described as a stretch goal for 2027. It would bring full network capacity with post-quantum transactions and post-quantum blobs, the large data packets that layer-2 rollups use to post their transaction data to Ethereum. Post-quantum signatures and proofs are generally much larger than the ones they replace, which is why reaching full capacity is the harder part of the problem.
Splitting the target this way gives developers a realistic minimum to aim for while keeping a more ambitious version on the table if research and engineering move quickly.
For ordinary holders, the account option is the most tangible part of the plan. Users who opted in could move to a post-quantum method of signing transactions ahead of any crisis, rather than relying on an emergency migration after weaknesses in today's signatures became apparent. Making that option available to every account, not just to new or specialized wallets, is what would let the network claim a credible defensive posture.
5. Quick Slots withdrawn from Hegotá
The most concrete consequence of the proposal is a sacrifice of Ethlabs' own making. The lab had championed Quick Slots, a plan to reduce Ethereum's slot time, the interval in which a new block can be proposed, from 12 seconds to 10 seconds.
Ethlabs is now pulling Quick Slots out of the Hegotá fork so that the effort can go toward pqai27 instead. The lab made clear it has not given up on the idea. "We continue to believe in quick slots and will work towards quicker slots in 2028," it wrote.
Shorter slots would mean faster confirmations for users and applications, so the withdrawal carries a real cost. Changing slot timing is also an intricate piece of engineering, because many parts of the protocol and the surrounding infrastructure are tuned to the existing 12-second rhythm. Removing it from Hegotá's scope frees developer attention that would otherwise be spent on that retuning.
6. How pqai27 compares with the Ethereum Foundation's 2029 target
The Ethereum Foundation's protocol team has set December 2029 as the deadline for making Ethereum's base layer fully quantum resistant. Researchers at the Foundation had also discussed the possibility of finishing the transition by 2028.
Against that backdrop, pqai27 would represent a genuine acceleration. Even its minimum milestone would bring post-quantum consensus and post-quantum account options forward by roughly two years compared with the official target, and its stretch goal would deliver a fully scaled post-quantum network well ahead of it.
The proposal also tests how Ethereum's priorities are set. The Foundation has long been the most influential voice in roadmap discussions, but the protocol has no single owner. Ethlabs is now attempting, in public, to reorder the agenda from outside the Foundation, and the response from client teams will show how much weight an independent lab can carry.
7. How Ethereum upgrades get decided
Ethereum has no chief executive who can order a change to the protocol. Upgrades are bundled into hard forks, coordinated software releases that every node operator must adopt, and each fork carries a name. Hegotá is the name given to the fork that follows the network's current set of planned changes.
Before a feature can be included in a fork, it typically goes through a long public process. Researchers publish ideas on forums such as Ethereum Magicians, write formal specifications known as Ethereum Improvement Proposals, and argue their case on regular calls attended by the teams that build Ethereum's execution and consensus clients. Those teams ultimately decide what they can implement and test in time.
Because of that structure, an independent lab like Ethlabs can influence the roadmap mainly by persuasion: publishing research, committing engineering effort and, as in this case, offering to give up one of its own priorities to make room for another. Withdrawing Quick Slots is meant to show that the lab is willing to pay a price for the change it wants.
8. Trade-offs facing Ethereum developers
The case for trading two seconds of slot time for an earlier quantum defense is relatively easy to make. A slower path to faster blocks inconveniences users; a cryptographic break with no fallback in place could threaten the network itself.
Other trade-offs are likely to be harder. Every hard fork has a limited capacity for change, because each feature must be specified, implemented across multiple independent client teams, tested and audited. Making room for an accelerated post-quantum program could push other planned upgrades later, and each of those has its own supporters.
There is also the question of feasibility. Post-quantum cryptography for blockchains is an active research area, and the larger data sizes involved create real performance challenges. A 2027 deadline leaves little room for the kind of extended testing that developers usually prefer before changes reach mainnet.
9. What happens next for pqai27
For now, pqai27 remains a proposal that reflects Ethlabs' own position. It has not been adopted as part of Ethereum's official roadmap, and core developers have not formally approved a 2027 post-quantum target.
Decisions about what goes into Hegotá rest with Ethereum's client teams and the open core developer process, where proposals are debated on public calls and forums before being scheduled. The withdrawal of Quick Slots, by contrast, takes effect regardless of how that debate unfolds, since it is a decision about Ethlabs' own proposal.
The coming months of Hegotá planning will show whether developers embrace the faster timetable, adopt parts of it, or stay with the Foundation's 2029 deadline. Either way, the proposal has moved the question of quantum readiness to the center of the conversation about Ethereum's next upgrade.