TLDR:
Delays in The Merge combined with SNARK advances prompted Ethereum to reconsider its eWASM strategy.
RISC-V architecture offers superior SNARK-friendliness compared to WebAssembly-based alternatives.
Multiple zkEVM implementations adopted RISC-V as standard, influencing Ethereum’s decision to pivot.
eWASM was originally planned to replace the flawed EVM before priorities shifted toward scalability.
Vitalik Buterin revealed the reasoning behind Ethereum’s abandonment of eWASM during a fireside chat at Pragma Taipei in April 2025. The Ethereum co-founder outlined how delays in The Merge combined with advances in SNARK technology necessitated the architectural shift.
RISC-V emerged as the superior choice for ensuring SNARK-friendliness across the network. The transition marks a significant departure from the originally planned eWASM upgrade to replace the existing Ethereum Virtual Machine.
Technical Rationale Behind the Architecture Change
Buterin explained that eWASM was initially designed to address fundamental flaws in the current EVM.
However, postponements in completing The Merge created an extended timeline that changed development priorities. During this period, zero-knowledge proof technology advanced rapidly across the ecosystem.
The rise of SNARKs introduced new requirements for virtual machine architecture. RISC-V demonstrated superior compatibility with zero-knowledge proof systems compared to WebAssembly-based alternatives.
Multiple zkEVM implementations adopted RISC-V as their foundation, establishing it as an industry standard.
Buterin emphasized that SNARK-friendliness became the decisive factor in the architectural decision. The need for efficient zero-knowledge verification outweighed previous commitments to the WebAssembly ecosystem.
RISC-V offers better performance characteristics for cryptographic operations essential to Ethereum’s scaling roadmap.
Broader Implications for Ethereum Development
The conversation with Partic at Pragma Taipei extended beyond virtual machine architecture to encompass developer tooling improvements.
Standardization around libraries like uVM and Foundry has accelerated development cycles for new projects. Nevertheless, educational resources for Solidity remain incomplete and frequently outdated.
Buterin discussed potential enhancements to the EVM that complement the RISC-V transition. Modernizing the standard library could improve developer productivity across the ecosystem.
Native integration of account abstraction would simplify wallet interactions and user onboarding processes.
Additionally, the discussion covered making oracles more native to the virtual machine architecture.
Simplified access to Web2 APIs could bridge traditional and decentralized applications more effectively. These upgrades align with the RISC-V adoption by creating a more cohesive development environment.
The Ethereum Foundation’s role in guiding these technical transitions received attention during the conversation.
Balancing infrastructure maintenance against building user-facing products requires strategic prioritization. Buterin acknowledged the challenges of accelerating protocol upgrades while incorporating community feedback effectively.
Cross-layer interoperability and light client servers represent additional areas requiring coordination alongside the virtual machine changes.
The shift to RISC-V influences how these components interact within Ethereum’s expanding tech stack. Buterin concluded by noting that addressing market failures remains central to the foundation’s mission going forward.
