Ethereum's "Lean" Era: Buterin Puts Quantum, Privacy & Speed on a 4-Year Crash Diet 🥄

Ethereum co-founder Vitalik Buterin has outlined a "Lean Ethereum" strawmap that names quantum resistance, scalability and privacy as the network's top priorities through the end of the decade, with the bulk of upgrades slated to roll out over the next three to four years. In a post to X on Saturday, Buterin framed the overhaul as the protocol's third major iteration, comparing its scope to the September 2022 Merge that moved Ethereum away from energy-intensive mining. He wrote that the collection of changes will touch nearly every layer of the network without forcing existing applications to migrate, and that Ethereum is, in his words, "reinventing itself."

The technical centerpiece is a shift in how the chain is verified: rather than every node re-executing every transaction, Ethereum would check a compact cryptographic proof of the chain using recursive STARKs, a form of zero-knowledge proof that Buterin wants enshrined as a core protocol component. He also floated simpler consensus with one or two-round finality, multidimensional gas pricing, and, eventually, a move beyond the EVM toward an instruction set such as RISC-V, alongside options like leanISA. Privacy, he said, is now a "first-class goal" woven into components including the mempool and state tree, with formal verification underpinning the whole effort.

"Quantum safety has shifted up a LOT in priority," Buterin wrote, adding that finalizing a quantum-safe solution for blobs has "become urgent," with work on the cryptographic primitive already months along. On the data side, Buterin sketched a 2030 network holding roughly 2TB of today's flexible "dynamic" state alongside 100 terabytes of a new, more scalable but restrictive type suited to tokens, NFTs and much of DeFi, though less so to complex contracts like decentralized exchanges. Rewriting an ERC-20 token onto the new storage would not be mandatory, he noted, but could cut its fees more than tenfold.

The roadmap arrives amid a restructuring at the Ethereum Foundation, which is parting ways with 54 employees — roughly 20% of its workforce — as the non-profit moves to reduce its budget by 40% and reorganize following the March publication of its 38-page "Mandate." The cuts come after several executive departures in recent months, including Hsiao-Wei Wang and Tomasz Stańczak, while protocol contributors Tim Beiko and Barnabé Monnot also left in May. Buterin is pushing for development of a new virtual machine like leanISA or RISC-V to support programmable privacy and better scalability.

Dankrad Feist, a researcher behind the payments-focused layer-1 Tempo blockchain, praised the plan but argued the three-to-four-year timeline is too slow, saying AI could help developers ship the upgrades within a year. Crypto analyst Ignas Fiodorovas backed the priorities but cast doubt on the Ethereum Foundation's ability to deliver on schedule, citing its history of missing deadlines, and said the only key feature missing from the roadmap was improved tokenomics for Ether ($ETH), which has continued to slide in price amid a broader market downturn. The updated strawmap was discussed at a recent meeting of Ethereum researchers in Berlin and is published at strawmap.org, with the next stop on the roadmap likely to be the upcoming Hegotá fork.