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Buterin outlines 3-4 year Ethereum roadmap starting from I-star

Buterin outlines 3-4 year Ethereum roadmap starting from I-star

Lean Ethereum is framed as a long-term evolution toward a “third-generation Ethereum,” with greater emphasis on post-quantum cryptography and privacy over a gradual three-to-four-year rollout.

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Fact Check
Buterin's primary X post directly confirms every element of the claim: a 3-4 year 'Lean Ethereum' roadmap crystallizing after a Berlin researchers' meeting following April talks in Svalbard, built on recursive STARKs, quantum-resistant cryptography, a redesigned consensus (decoupled available chain + 1-2 round finality), multidimensional gas, and a dual-layer state structure targeting ~2 TB dynamic plus ~100 TB new state types by 2030 — with H-star/Hegota as the last pre-Lean fork and everything from I-star onward having a 'Lean' feel. The Block and KuCoin independently corroborate the timeline and technical pillars.
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Summary

Ethereum co-founder Vitalik Buterin said Lean Ethereum is a long-term evolution plan for the network, describing it as a series of protocol overhauls to be implemented gradually over three to four years starting from “I-star.” He said the effort is aimed at a “third-generation Ethereum” that places greater priority on post-quantum cryptography and privacy. Earlier discussions around the roadmap had already highlighted recursive STARK verification, quantum-resistant cryptography, consensus redesign, multidimensional gas and a dual-layer state structure around 2030, underscoring that the plan is a broad architectural redesign rather than a single upgrade.

Terms & Concepts
  • post-quantum cryptography: Cryptographic techniques designed to remain secure even against attacks from powerful quantum computers.
  • recursive STARK verification: A cryptographic approach that lets proofs verify other proofs efficiently, helping systems scale validation.
  • multidimensional gas: A fee model that prices different kinds of network resource usage separately instead of with a single charge.