Vitalik Buterin Unveils Lean Ethereum, ETH's Third Major Overhaul in 3-4 Years

Ethereum News

Ethereum co-founder Vitalik Buterin has outlined a sweeping long-term redesign called Lean Ethereum, framing it as the network's third major overhaul after 2022's Merge. In a July 5, 2026 statement, Buterin described the effort not as a single upgrade but as a staged program unfolding over the next three to four years. The plan revisits core protocol pillars — consensus, state data, verification and client architecture — to rebuild Ethereum around scalability, efficiency and simpler development. Buterin tied the vision to an updated long-term roadmap known as Strawmap, positioning Lean Ethereum as a generational shift comparable in ambition to the Proof-of-Stake transition itself.

The most consequential change, by Buterin's own account, targets how Ethereum stores state data. Developers are converging on a two-layer model that keeps the current dynamic state at a moderate size while adding a new, more scalable data format. Buterin projected that by 2030 the legacy format could hold roughly 2 terabytes of data against about 100 terabytes in the new structure. The new format suits ERC-20 tokens, NFTs and many decentralized exchange use cases, while complex contracts such as on-chain order books stay on the existing design. Migrating tokens to a UTXO-style layout, he noted, could cut transaction fees to below one-tenth.

Quantum resistance and privacy have moved sharply up the priority list. Buterin said every feature, including data blobs, must be designed with post-quantum security in mind, and that finalizing a quantum-safe blob design is now an urgent task already in development. Privacy, he stressed, should be a first-class goal rather than a bolt-on: transaction confidentiality would be baked into components like frames, the mempool and state-tree extensions from the earliest design stage. The roadmap formally adopts recursive STARKs, a cryptographic proving technique used by privacy-focused networks, to replace today's re-execution-based verification with succinct proofs. Buterin summarized the mission as CROPS — censorship resistance, open source, privacy and security.

Buterin also revisited a long-term move away from the Ethereum Virtual Machine, the software environment that runs every application on the chain. He argued Ethereum will eventually need at least one alternative virtual machine suited to recursive STARKs, citing leanISA and RISC-V as the leading candidates. The ideal, he said, would reposition the EVM as a compiler-level feature while the protocol natively recognizes only RISC-V or leanISA. Opening such an execution environment to users would make programmable privacy and higher scalability far easier to achieve. Buterin conceded this shift remains well into the future, but described it as central to the redesign's ambitions.

Nearer-term scaling steps are also mapped out. Buterin expects repeated increases to the gas limit, expansions of blob capacity and reductions in slot time over the coming five years. The immediate step is Glamsterdam, the next scheduled upgrade targeting a mainnet launch in the second half of 2026, which is set to deliver a substantial gas-limit increase. A multidimensional gas-fee model and faster finality through a new consensus design round out the near-term agenda. Together these changes aim to raise throughput for the applications built on Ethereum without waiting for the deeper state and execution overhauls to land.

The migration will be gradual. Buterin indicated that Hegotá, also called H-star, will be the final hard fork before the Lean era, with the subsequent I-star upgrade marking the real pivot to Lean-based design. The updated Strawmap envisions seven forks executed at roughly six-month intervals through 2029, with app developers and other stakeholders shaping each specification. Supporting that cadence, the Ethereum Foundation disclosed in June 2026 a roughly 40% budget reduction and 54 staff cuts, redirecting development resources toward core Strawmap projects. The restructuring signals an intent to concentrate scarce engineering capacity on the phased path toward Lean Ethereum.

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