Buterin set out a five-year path to simplify Ethereum’s base layer

Vitalik Buterin on May 3, 2025 set out a long-term proposal for making Ethereum’s base layer substantially simpler, arguing that reduced protocol complexity was essential to the network’s resilience and ability to scale. His stated ambition was for Ethereum’s consensus-critical code to become nearly as simple as Bitcoin’s within five years.

The document, titled “Simplifying the L1,” was a design thesis from Ethereum’s co-founder, not an adopted specification, client release or scheduled network upgrade. Its importance came from the breadth of the proposed direction: Buterin connected consensus redesign, execution-layer replacement and common technical standards under one objective—reducing the amount of specialized logic that every fully participating implementation must understand correctly.

A simpler consensus and execution model

For consensus, Buterin pointed to work historically associated with the “beam chain” concept. He argued that a three-slot finality design could eliminate separate slot-and-epoch machinery, committee shuffling, sync committees and other mechanisms embedded in the Beacon Chain architecture. He also proposed reducing the number of validators active at a given moment and using cryptographic aggregation to simplify networking and fork-choice requirements.

These were proposed architectural benefits, not demonstrated production outcomes. The May 3 document did not supply a mainnet activation date, completed security analysis or agreement among Ethereum’s independent client teams.

The more disruptive idea concerned execution. Buterin described the Ethereum Virtual Machine as burdened by accumulated features and suggested eventually replacing its consensus-critical role with RISC-V or another minimal virtual machine suited to zero-knowledge proving. He had published a more focused RISC-V proposal on April 20, 2025, explaining that existing EVM contracts could remain usable through interoperability or an interpreter rather than being discarded.

The May 3 transition outline began with canonical onchain implementations for new precompiles, added the new virtual machine alongside the EVM, and eventually moved legacy EVM execution behind an interpreter. That sequence was explicitly long-term. It did not mean Ethereum had selected RISC-V, deprecated Solidity or scheduled the EVM’s removal.

Why simplification mattered

Ethereum’s general-purpose design supported programmable accounts, smart contracts, validators, rollup data and multiple client implementations. Each additional consensus-critical rule could increase implementation, auditing and maintenance work. Buterin’s interpretation was that simpler core rules would make independent clients and formal verification easier, reduce opportunities for catastrophic bugs and lower the technical barrier to participating in protocol research.

He also proposed sharing more components across Ethereum’s stack: one erasure-code family for data availability and history distribution, one serialization approach based on Simple Serialize, and eventually one tree structure across consensus and execution. The intended benefit was not merely fewer lines of code. Shared components could reduce duplicated implementations and the number of assumptions that must remain compatible across different parts of the network.

That argument involved tradeoffs. Moving complexity outside consensus-critical paths does not make historical compatibility, developer tooling or block construction disappear. It changes where that complexity lives and which failures can threaten agreement on the chain’s state.

Proposal versus the scheduled upgrade

The distinction was especially important on May 3, 2025 because Ethereum’s Pectra upgrade was already scheduled for May 7, 2025 at epoch 364032, corresponding to 10:05:11 UTC. The Ethereum Foundation’s April 23 announcement identified released client versions and a defined package of changes affecting accounts, validators and blob capacity.

Pectra therefore represented an implementation-ready upgrade known on May 3. Buterin’s simplification document represented a possible direction for later design work. Treating the two as equivalent would overstate the May 3 development.

The verified conclusion is narrower: an influential Ethereum researcher articulated a coordinated simplification agenda and supplied concrete transition concepts. Whether any component would enter Ethereum depended on subsequent specifications, technical review, client implementation, testing and adoption by node operators. The May 3 record established the proposal and its rationale, not its acceptance or eventual outcome.