Ethereum evaluates binary state tree under EIP-7864

What Ethereum’s state tree restructuring and VM upgrades change

Vitalik Buterin has said Ethereum’s execution-layer roadmap focuses on two fronts: restructuring the state tree and exploring virtual machine changes to address core protocol constraints. In practice, that points to replacing the current hexary Merkle Patricia Trie with a more compact structure and reassessing the EVM’s 256-bit design in favor of architectures that are friendlier to modern proving and verification.

On state, a binary tree structure paired with a prover‑friendly hash is being discussed to shorten Merkle branches, simplify verification, and enable more efficient pruning and partial statelessness. Designs under consideration also include unifying account and storage data into a single tree and moving away from RLP encoding to streamline witness generation and validation.

On the VM, proposals study moving beyond the EVM toward instruction sets like RISC‑V that emphasize 32/64‑bit operations. The anticipated benefits include simpler tooling for proofs and less overhead than 256‑bit arithmetic for many tasks, while compatibility paths such as coexisting VMs or interpreter layers are being evaluated to preserve existing contracts and developer workflows.

Why it matters: state growth, node costs, and decentralization

According to the Ethereum Foundation’s Stateless Consensus research, unbounded state growth raises storage, sync, and query costs, which can push smaller or new node operators out of the network and weaken decentralization. The research frames state‑tree changes as pragmatic steps that make it easier to prune, verify, or partially statelessize state while preserving permissionless participation.

If implemented conservatively, these changes could reduce the size of Merkle proofs and the bandwidth required to transmit them, which in turn may lower gas and infrastructure overhead for clients. However, any migration must balance gains against implementation risk, with particular care around new hashing choices, data formats, and how nodes handle legacy state.

As reported by Odaily, one developer critique argues that VM performance claims rely heavily on assumptions about zero‑knowledge proof systems and witness generation, and that real‑world improvements may be narrower once hardware, latency, and gas‑accounting constraints are factored in. The same critique highlights maintainability and backward‑compatibility risks if Ethereum moves too quickly away from EVM norms without robust interpreter or dual‑VM strategies.

Cross‑protocol voices note that RISC‑V is gaining traction in other designs, underscoring the broader appeal of a minimal, general‑purpose ISA for blockchain VMs. “It makes sense, we are using RISC‑V with BitVMX. It’s the future,” said Charles Hoskinson, founder of Cardano.

At the time of this writing, ETH traded around $1,970.47 with volatility labeled high (7.55%) and an RSI near neutral (42.11), alongside 13 green days in the last 30; these figures provide context and do not imply direction.

EIP-7864: Binary tree versus hexary Merkle Patricia Trie

According to the EIP‑7864 working draft, moving from a hexary Merkle Patricia Trie to a binary tree reduces Merkle branch size, which can shrink proof and transmission footprints and ease proving time. The draft discusses harmonizing account and storage into a single tree and selecting a proving‑friendly hash to improve verification efficiency.

The draft also contemplates deprecating RLP to reduce complexity in encoding and witness handling, potentially simplifying client implementations over time. While these changes target lower state growth and cheaper participation, they introduce migration, audit, and security considerations, especially around new hash functions, that would need thorough review before production.

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