Ethereum MEV-Boost Builders, Block Auctions, and Centralization Risks
Summary
This report explains how MEV-Boost changed Ethereum’s post-Merge transaction supply chain by separating block construction from block proposing. Searchers identify opportunities to profit from transaction ordering, builders assemble transactions into reward-maximizing blocks, relays connect builders with validators and check payments, and validators choose blocks to propose. The arrangement uses off-chain relays as an interim form of proposer-builder separation while protocol-level separation remains a longer-term goal.
The report discusses how competition among searchers can reduce MEV margins, and distinguishes user-beneficial activity such as arbitrage and backrunning from harmful sandwiching. It cites 2022 MEV activity and relay usage, including the reported dominance of Flashbots, to illustrate the scale and concentration concerns. The account also raises risks from censorship, payment for order flow, and specialized builders, then names possible responses such as inclusion lists and partial block auctions. Its evidence and descriptions are specific to Ethereum around 2022 and early 2023; the supplied text is truncated, so later discussion and full supporting detail are unavailable.
Key ideas
- MEV-Boost lets Ethereum validators obtain prebuilt blocks through off-chain relays while delegating block construction to builders.
- Searchers compete to profit from transaction ordering, with arbitrage identified as a major source of MEV in 2022.
- Relays check builder-validator interactions, but reliance on them creates intermediary and censorship risks.
- Builder specialization and payment for order flow could concentrate block construction and weaken network neutrality.
- The report identifies inclusion lists and partial block auctions among proposed ways to reduce centralization risks.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.