Ethereum co‑founder Vitalik Buterin cited Bitcoin’s Utreexo on August 16 while outlining a hybrid state‑scaling proposal that combines UTXO‑style state with conventional dynamic accounts. The plan, still a research concept, does not constitute an official protocol change. Utreexo, introduced by MIT Digital Currency Initiative researcher Thaddeus Dryja in 2019, uses a hash‑based accumulator to represent the Bitcoin UTXO set, enabling nodes to verify transactions without storing the entire set and reducing state growth logarithmically. Ethereum researcher Toni Wahrstätter has proposed native UTXO‑like payments that could lower permanent state usage by roughly 99.8% for one‑shot payments while retaining existing accounts. The estimate projects about 300 MB of state for one billion entries versus 100 GB to 150 GB for comparable account‑based entries. The proposal relies on EIP‑8141 (Frame Transactions), which is listed as “considered for inclusion” in the Hegotá roadmap, slated for 2027 after the Glamsterdam upgrade in Q4 2026. Buterin emphasized that the goal is to let Ethereum scale further without sacrificing decentralization, censorship resistance, or node operation ease, and that the account model would not be replaced. His recursive‑STARK mempool research proposes aggregating validity proofs to limit bandwidth, assuming 128 kB STARK proofs and periodic aggregation across peers, estimating roughly 2 MB of additional traffic per node per second. Researchers note that combining the UTXO execution model with STARK‑aggregated mempool architecture remains speculative and not a confirmed roadmap commitment. The work aims to reduce verification and storage burdens while preserving Ethereum’s core properties.