Vitalik Buterin proposed an “Extremely Lean” redesign of Ethereum (ETH) that would push the chain toward near-zero state using ZK proofs.
Key Points:
- Buterin outlined a two-step plan to move much of Ethereum’s state burden to validators.
- The proposal would replace per-epoch balance updates with one daily ZK-STARK proof from each validator.
- Buterin said the design could help Ethereum scale to millions of validators while cutting validator state to about 6 bytes.
Ethereum Proposal
Buterin described the plan in an Ethereum Research forum post titled “The Extremely Lean Chain.”
The proposal focuses on Ethereum’s Beacon Chain, the consensus layer that coordinates validators and supports proof-of-stake operations. Buterin said recursive STARK proofs could reduce onchain data while supporting single-slot finality and quantum-resistant cryptography.
The first phase would remove most validator data from the chain and replace repeated balance updates with a single daily proof from each validator. That proof would cover rewards and penalties, allowing the chain and full nodes to remain lighter.
In practice, validators would do more of the work, while the protocol would keep far less state onchain. Buterin said the change could reduce validator state to roughly 6 bytes.
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Buterin Roadmap
The second phase would add privacy by giving each validator a fresh anonymous key and identity every day. Validators would re-register and prove balances privately, creating a daily rotating set that is harder to link.
These changes “may allow consensus to scale to millions of validators if needed,” Buterin wrote early Monday.
The proposal sits inside the broader Lean Ethereum roadmap, which Buterin described over the weekend as the network’s third major iteration. He said the work could rival the Merge, Ethereum’s shift to proof-of-stake, in technical difficulty.
Lean Ethereum is designed to remake the core protocol around security, decentralization, efficiency and post-quantum resilience. Its main parts include Lean Consensus, Lean Data and a minimal, SNARK-friendly execution environment that could use RISC-V.
Buterin said the changes could take three to four years as research shifts toward the effort. He also said the coming Hegota upgrade will likely be Ethereum’s last thematically pre-Lean fork.
The roadmap follows governance changes around the Ethereum Foundation, including downsizing and reorganization. Two new nonprofits, Ethereum Institutional and EthLabs, backed by Bitmine, Sharplink and Joseph Lubin, have also launched, with EthLabs expected to contribute to protocol research and development.
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