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Lean Ethereum unveiled
Ethereum co-founder Vitalik Buterin outlined a new “Lean Ethereum” roadmap that he said would be rolled out over the next three to four years, with the draft spanning 2026 through 2029.
“Ethereum co-founder Vitalik Buterin has named quantum resistance, scalability and privacy as three of Ethereum's top priorities under a new "Lean Ethereum" strawmap, which lays out the network's technical direction for the remainder of the decade”
Buterin presented the plan as a working draft on X and compared its breadth to the September 2022 Merge, when Ethereum shifted from energy-intensive proof-of-work mining to a proof-of-stake system.
The roadmap places quantum resistance, privacy, and scalability at the top of Ethereum’s priorities, and it is described as touching nearly every layer of the network.
In the same update, Buterin said “Quantum safety has shifted up a LOT in priority,” and flagged finalizing a quantum-safe solution for “blobs” as urgent.
The plan also calls for a new consensus model and a move toward recursive STARK proofs for faster block verification, according to the reporting on the strawmap.
Debate over timeline
Researchers and analysts welcomed the goals but questioned whether the three-to-four-year window is realistic, with Dankrad Feist saying the timeline runs too slow.
Feist, a researcher behind the payments blockchain Tempo, argued that “AI-assisted development could compress the same work into roughly a year,” shifting the debate toward coordination and resources.
Crypto analyst Ignas Fiodorovas backed the goals yet doubted the foundation can hold to its dates, citing a history of slipped deadlines.
Fiodorovas also flagged weak tokenomics for Ether (ETH) as the plan’s clearest gap, as the token slides through a broader market slump.
The roadmap arrives as the Ethereum Foundation pushes through restructuring, including cutting about 20% of its staff last month and setting out to trim its budget by 40%.
What’s at stake
Beyond timing, the roadmap’s stakes are framed around security against quantum computing, with Buterin emphasizing that quantum safety has risen sharply and that finalizing quantum-resistant “blobs” has become urgent.
“Vitalik Buterin shares top priorities for new 'Lean Ethereum' strawmap Part of the Ethereum Foundation’s plan to make Ethereum more private and scalable is to introduce a new virtual machine, with leanISA and RISC-V among the top candidates”
The plan also elevates privacy into a first-class goal, with Buterin describing privacy as no longer an afterthought and pushing for programmable privacy supported by a new virtual machine.
In the reporting, the roadmap is described as a coordinated sequence of upgrades that aims to simplify Ethereum’s architecture while improving efficiency, scalability, and long-term security.
CryptoNinjas reports that Buterin said apps on new state models could slash transaction costs by over 10x, and it also cites targets of up to 2 TB of traditional state and 100TB of new scalable state by 2030.
The sources also frame the effort as a third major iteration comparable to The Merge, with Buterin saying “Nearly every core part of the protocol will change,” while aiming to preserve backward compatibility for existing dApps and DeFi protocols.
