Debate continues on balancing innovation with network complexity and security.
Vitalik Buterin, co-founder of Ethereum, has shifted the conversation about network scalability away from Layer 2 solutions, calling attention instead to foundational bottlenecks within Ethereum’s core protocol. According to Buterin, the true long-term constraints on the network are not rollups or data capacity, but the architecture of the state tree and the virtual machine that underpins Ethereum itself.
Key Bottlenecks: Rethinking the State Tree and Virtual Machine
Buterin points out that the lion’s share of verification costs on Ethereum stem from the state tree and the virtual machine. This challenge grows increasingly critical as zero-knowledge (ZK) proofs take center stage on Ethereum’s roadmap, promising more secure and efficient transaction validation.
ContentsKey Bottlenecks: Rethinking the State Tree and Virtual MachineA Structural Leap: From Hexary to Binary TreesEnvisioning a Move Beyond EVM to RISC-V
Focusing on two main shifts, Buterin remarked that “changes to the state tree and virtual machine are the major bottlenecks we need to resolve to enable efficient proof generation.”
His comments suggest that, unless the underlying architecture evolves, the network cannot ultimately achieve the kind of low-cost, high-efficiency validation infrastructure that its future demands.
A Structural Leap: From Hexary to Binary Trees
With the proposed EIP-7864, Buterin advocates for overhauling the longstanding Merkle Patricia Trie — currently based on a hexary (six-branch) structure — by adopting a binary tree design. This technical shift would slash proof lengths to roughly a quarter of their current size, sharply accelerating the verification process and making access easier for lightweight clients and privacy-focused applications.
The new binary tree structure organizes data in “pages,” granting applications that tap into similar datasets the ability to process transactions more efficiently. Decentralized applications, for instance, would face lower gas costs when accessing closely clustered storage locations. Buterin also notes that combining this redesign with faster hashing algorithms could further speed up proof generation.
Ultimately, this architecture aims to make Ethereum’s base layer both natively compatible and seamlessly integrable with ZK proofs. By doing so, applications could connect directly to network state, eliminating the need for complex parallel systems.
Envisioning a Move Beyond EVM to RISC-V
Buterin is also putting forth the bold idea of moving past the Ethereum Virtual Machine (EVM) as the network’s execution engine. Adopting a design based on RISC-V — a widely used open-source instruction set architecture — could yield higher execution efficiency, decreased complexity, and greater synergy with modern ZK systems. The ubiquity of RISC-V may also simplify the integration process, lowering barriers to network participation.
In the near future, Buterin suggests that precompiled vectorized mathematical operations, akin to building a “GPU for EVM,” could boost the speed of cryptographic processes today. Longer term, he outlines a phased transition where RISC-V would first be introduced for precompiles, then for user contracts, and eventually become foundational across all EVM supervisory layers.
Such a shift is seen as a step toward fulfilling Ethereum’s vision of broad, flexible programmability at the protocol level.
Yet, major architectural overhauls are not without critics. DBCrypto, an industry commentator, has cautioned that every additional framework and abstraction introduced on Ethereum may not only increase trust assumptions, but also widen the attack surface, making the ecosystem potentially more vulnerable.
This growing debate revolves around whether Ethereum’s future should rest on new protocol layers stacked atop the current system, or whether a fundamental redesign at its core is needed. Buterin, for his part, posits that as ZK technology matures, the next stride in scaling will not come from Layer 2 — but from deep within the protocol’s heart.
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