Vitalik Buterin has outlined Lean Ethereum, a sweeping redesign he calls the network’s third major evolution after the Merge. The upgrades will roll out across three to four years, touching nearly every core part of the protocol.
Buterin shared the plan through a public roadmap he calls the strawmap, an Ethereum Foundation draft. He said almost every major piece will be replaced, calling the effort ambitious yet low-risk.
What Lean Ethereum Changes
Recursive STARKs sit at the center. The cryptographic proof system would verify the chain rather than force every node to re-execute transactions. Buterin wants these proofs enshrined as a core protocol component.
Quantum safety has also jumped up the list. The roadmap swaps quantum-vulnerable cryptography for hash-based schemes built to outlast quantum computers. The shift echoes NIST, the US standards body that finalized its first post-quantum encryption standards in 2024.
The most disruptive change targets how Ethereum stores data. Buterin would keep today’s core protocol architecture largely intact. He would add a restrictive new state type that scales toward 100 TB by 2030.
Rewriting an ERC-20 token or non-fungible token (NFT) into that format could cut fees more than 10x. Complex apps like decentralized exchanges would stay put.
Privacy becomes a first-class goal, not an afterthought, extending Buterin’s broader privacy push. Nearer term, the upcoming Glamsterdam upgrade should raise the gas limit.
Buterin has reason for confidence. The 2022 Merge moved Ethereum to proof of stake and cut its energy use by more than 99%. It shipped with little disruption to users or apps.
“But make no mistake, this IS the third major iteration of Ethereum in the same way that the Merge was the second,” Vitalik Buterin articulated.
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Not Everyone Buys the Timeline
The schedule drew fast pushback, and not from outsiders. Dankrad Feist praised the vision but called three to four years far too slow. The Ethereum Foundation researcher’s data-scaling work gave danksharding its name.
“Fully proven STF and scaling to Gigagas with finality in seconds gets me excited! But 3-4 years is very slow… I think we should be ambitious and get it done in ~1 year. I think this is realistically possible now with LLMs,” Dankrad Feist suggested.
His faith in AI is not fringe. The strawmap itself assumes human-first development and concedes that AI-accelerated research could compress the timeline.
Others were more cautious. Some urged the Foundation to underpromise, drawing the reply that underpromising only leads to under-delivery.
The stakes are practical. The overhaul arrives weeks after a leaner Ethereum Foundation cut about 20% of its staff, or 54 roles. It has also moved to a tighter, endowment-style budget.
The strawmap remains a draft, not a schedule. Buterin said the coming Hegotá fork is likely the last before the Lean era begins.
Ether (ETH) has fallen about 41% in 2026 to near $1,760. For now, its market price reflects a market waiting on delivery, not promises.
Bitrue