Ethereum co-founder Vitalik Buterin credited Bitcoin developers on Aug. 16 for work on Utreexo while describing a proposed Ethereum scaling direction that could combine UTXO-style state, conventional dynamic state and models between the two.
Summary
- Vitalik Buterin credited Bitcoin developers for Utreexo while outlining Ethereum’s proposed hybrid state scaling strategy.
- Ethereum researcher Toni Wahrstätter proposed native UTXOs that could cut payment state usage roughly 99.8%.
- The proposal keeps Ethereum accounts while moving simple one-shot payments into a lighter UTXO-style model.
- EIP-8141 Frame Transactions, required by the UTXO design, is currently only considered for Hegotá inclusion.
- Vitalik’s recursive-STARK mempool proposal limits proof bandwidth overhead rather than proving unlimited Ethereum transaction throughput.
In an X post, Buterin called it the “current proposed Ethereum scaling strategy,” making clear that the architecture remains under development.
Buterin said the goal is to let most Ethereum activity scale much further without sacrificing decentralization, censorship resistance or ease of running nodes. His comments do not mean Ethereum has decided to replace its account model with Bitcoin’s UTXO architecture. The relevant designs remain research proposals rather than approved protocol changes.
Bitcoin’s Utreexo offers a model for reducing node state
Utreexo was introduced by MIT Digital Currency Initiative researcher Thaddeus Dryja in 2019. Instead of requiring a validating node to locally hold the full Bitcoin UTXO set, the design represents that set with a compact hash-based accumulator. Transaction inputs carry inclusion proofs that allow nodes to verify relevant outputs against that accumulator.
MIT DCI’s original paper says the accumulator grows logarithmically with the underlying set. That addresses the same broad problem Ethereum researchers are examining: increasing network activity without forcing state-storage requirements to rise at the same pace. Utreexo remains a Bitcoin scaling project rather than a feature Ethereum is copying directly.
Ethereum’s native UTXO proposal targets payment state
A July 6 Ethereum Research proposal from Toni Wahrstätter, writing as Nero_eth, proposes adding native UTXO-like payments without removing Ethereum accounts. The model targets one-shot payments that do not require persistent smart-contract state.
The proposal estimates that these workloads could reduce permanent state usage by roughly 99.8%. Rather than storing the full payment object in active state, Ethereum would prove its existence from history while mainly retaining a compact spent-status bit. At one billion entries, the proposal estimates roughly 300 MB of permanent state, compared with about 100 GB to 150 GB for equivalent account or storage entries. Those are design estimates, not measured mainnet results.
The approach fits Ethereum’s wider effort to reduce verification and storage burdens. As crypto.news previously reported, Ethereum’s Lean rebuild places recursive cryptographic proofs at the center of its proposed verification overhaul.
Recursive STARKs solve a different scaling bottleneck
Buterin’s January recursive-STARK mempool research tackles proof bandwidth. His model assumes highly optimized STARK proofs of about 128 kB and proposes that mempool nodes periodically combine validity proofs recursively instead of attaching a separate large proof to every object being propagated.
Using Buterin’s example of eight peers and 500-millisecond aggregation intervals, extra bandwidth would total about 2 MB per second per node and remain constant as more objects enter the scheme. The mempool research and native UTXO proposal address different constraints, although researchers are exploring how such technologies might complement one another.
A community response extrapolated the combination into an architecture capable of settling an “unbounded volume” of UTXO transitions through a compact proof. That is not a confirmed Ethereum throughput target or roadmap commitment. Buterin’s research does not establish unlimited transaction capacity, and the 128 kB figure describes an assumed STARK proof size in his mempool model, not a confirmed future Ethereum block format.
What happens next for Ethereum scaling
The native UTXO proposal assumes EIP-8141, or Frame Transactions, for its preferred spending design. EIP-8141 would introduce programmable transaction frames covering validation, gas payment and execution. The official Hegotá specification currently lists Frame Transactions only as “Considered for Inclusion.” FOCIL, or EIP-7805, remains the only proposal formally scheduled for Hegotá.
Ethereum’s official roadmap places Hegotá in 2027, after Glamsterdam in the fourth quarter of 2026. Native UTXOs are not currently listed as a scheduled Hegotá feature. As crypto.news reported, Hegotá’s 2027 upgrade scope is still being narrowed, with Frame Transactions among the major designs still under consideration.
Buterin’s Utreexo reference therefore signals a research direction rather than a dated Ethereum upgrade. The work points toward a hybrid system in which different types of activity could use different state models, while cryptographic proofs reduce what individual nodes must store or repeatedly verify.
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