Vitalik Buterin Outlines New Virtual Machine as Core of Ethereum's 'Lean' Overhaul
The Ethereum Foundation is considering a new virtual machine for the $ETH network as part of a preliminary roadmap Vitalik Buterin is calling "Lean Ethereum." Buterin has identified leanISA and RISC-V as the leading candidates for that new execution environment. The proposal, framed as a strawmap — a working draft circulated for discussion rather than a finalized plan — puts protocol-level architecture at the center of the Foundation's stated goals of making Ethereum more private and scalable.
Key takeaways
- The Ethereum Foundation is considering a new virtual machine for the ETH network under a preliminary roadmap Vitalik Buterin calls 'Lean Ethereum.'
- Buterin named leanISA and RISC-V as the two leading candidates for the new execution environment, but neither has been formalized.
- The proposal is a 'strawmap' — a working draft circulated for discussion rather than a finalized plan or commitment.
- The Foundation framed the virtual machine overhaul as serving two stated goals: making Ethereum more private and more scalable.
- No timeline has been disclosed for deciding on the VM candidates or incorporating Lean Ethereum into a formal development roadmap.
The Ethereum Foundation is considering a new virtual machine for the $ETH network as part of a preliminary roadmap Vitalik Buterin is calling "Lean Ethereum." Buterin has identified leanISA and RISC-V as the leading candidates for that new execution environment. The proposal, framed as a strawmap — a working draft circulated for discussion rather than a finalized plan — puts protocol-level architecture at the center of the Foundation's stated goals of making Ethereum more private and scalable.
The Virtual Machine Question
At the technical core of the Lean Ethereum initiative sits a choice the Foundation has not yet made: which virtual machine should underpin future Ethereum execution. The two candidates Buterin named are leanISA, a purpose-built instruction set aimed at minimalism, and RISC-V, an open-standard reduced instruction set architecture that originated in academic computer science and has since found broad industrial adoption. Neither selection has been formalized. The strawmap format signals that Buterin is soliciting input rather than announcing a decision, though naming two concrete candidates narrows the field publicly and invites scrutiny from core developers and external researchers alike.
Privacy and Scalability as Stated Drivers
The Ethereum Foundation framed the virtual machine overhaul as serving two goals: privacy and scalability. Both have been longstanding pain points for the network, and both have generated competing technical proposals across Ethereum's developer community for years. The strawmap does not, based on the available summary, specify how a new VM directly addresses either goal in measurable terms — a detail that will matter when the proposal moves from working draft toward any implementation phase.
What Remains Open
Buterin's use of the strawmap format is deliberate: the document is designed to be revised. No timeline for a decision on the virtual machine candidates has been disclosed, and the Foundation has not indicated when or whether the Lean Ethereum priorities would be incorporated into a formal development roadmap. For a network where protocol changes require broad consensus among independent client teams, a working draft is a starting point, not a commitment.