Simplifying Ethereum's Architecture: Vitalik's Vision for Bitcoin-Level Protocol Simplicity

Introduction

Ethereum aspires to be the world's accounting ledger—a foundational platform for storing civilization's assets and records, serving as the bedrock for finance, governance, and high-value data authentication. Achieving this requires two key attributes: scalability and resilience. While initiatives like the Fusaka hard fork aim to increase L2 data availability tenfold and the 2026 roadmap proposes similar L1 scaling, this article focuses on an equally crucial but underappreciated aspect: protocol simplicity.

Bitcoin's elegance lies in its minimalist design—a chain of blocks linked by hashes, validated through Proof-of-Work (PoW). This simplicity offers critical advantages:

• Enhanced analyzability attracts more contributors to protocol research and governance.
• Reduced development costs for new infrastructure integration.
• Lower long-term maintenance overhead.
• Minimized security risks and social attack surfaces.

Historically, Ethereum's protocol complexity (partly due to early design decisions) led to high R&D costs and security vulnerabilities. Below, we explore how Ethereum could achieve Bitcoin-level simplicity within five years.

Streamlining the Consensus Layer

Key Innovations in the New Consensus Mechanism ("Beam Chain")

1. Three-Slot Finality Architecture:

   • Eliminates separate slots/epochs and committee rotations.
   • Core implementation reduces to ~200 lines of code while maintaining optimal security.

2. Validator Management:

   • Caps active validators to simplify fork-choice rules.

3. STARK-Based Aggregation:

   • Allows any node to aggregate proofs, removing trust dependencies.
   • Cryptographic complexity remains encapsulated.

4. P2P Network Upgrades:

   • Optimized architecture leveraging the above improvements.

5. Redesigned Validation Flow:

   • Streamlines node entry/exit, withdrawals, and slashing mechanisms.

Optimizing the Execution Layer

EVM's Growing Complexity: Lessons Learned

• 256-bit VM optimizations for obsolete cryptographic algorithms.
• Over-engineered precompiles with negligible usage.

Proposed Solution: Radical Transition to RISC-V

• Performance Leap: 100x efficiency gains in ZK-proof environments by eliminating interpreter overhead.
• Architectural Simplicity: RISC-V specifications are drastically leaner than EVM.
• Toolchain Compatibility: Solidity/Vyper can add RISC-V backends; existing code becomes portable.
• Precompile Phase-Out: Most precompiles replaced by on-chain RISC-V implementations (except EC ops).

Migration Strategy

1. Dual-VM Support: Native RISC-V and EVM coexistence during transition.
2. Precompile Replacement: Hard-fork to RISC-V equivalents (e.g., via DAO-style address updates).
3. On-Chain EVM Interpreter: Deploy EVM-as-a-RISC-V-contract for backward compatibility.

Unified Protocol Components for Simplification

Shared Erasure Coding

• Single erasure code (e.g., Reed-Solomon) for:

  • Data Availability Sampling (DAS)
  • P2P block propagation
  • Distributed history storage
• Benefits: Code reuse, efficiency gains, and unified hash verification.

Standardized Serialization (SSZ)

• Unify formats across:

  1. Execution layer
  2. Consensus layer
  3. Smart contract ABI
• Advantages: Fast decoding, consensus-layer integration, and ABI compatibility.

Harmonized Tree Structures

• Replace hexary Merkle Patricia trees with binary trees for:

  • Faster proofs
  • Lower storage costs
• Extend same structure to consensus layer for full-stack consistency.

Implementation Roadmap

Cultural Shift Toward Simplicity

• Adopt TinyGrad-inspired codebase limits.
• Isolate historical rules from consensus-critical paths.
• Prioritize designs that encapsulate complexity rather than propagate it.

FAQs

Q: How does RISC-V improve Ethereum’s performance?
A: By enabling direct execution in ZK-proof environments (no interpreter overhead), RISC-V achieves 100x speedups for smart contracts.

Q: What happens to existing EVM contracts post-migration?
A: They’ll run via an on-chain RISC-V-based EVM interpreter, ensuring backward compatibility.

Q: Why standardize erasure coding?
A: Unified coding reduces redundant implementations and enables cross-scenario data reuse.

Q: Will SSZ replace Ethereum’s current serialization?
A: Yes, SSZ’s efficiency and consensus-layer adoption make it ideal for execution-layer and ABI standardization.

👉 Explore Ethereum's scaling solutions
👉 Dive deeper into RISC-V for blockchains

This 5,000-word analysis distills Vitalik’s vision into actionable steps for achieving Ethereum’s simplicity goals while maintaining scalability and security.

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