Unbundling the Current State of Proposer-Builder Separation

This article is originally published on the Etherscan blog . Introduction Approximately 90% of all Ethereum blocks have been built by just 4 block producers in the past 30 days. The largest builder, beaverbuild , holds a market share of nearly 50%. With both beaverbuild & rsync-builder censoring OFAC-sanctioned transactions, it means that only about 40% of blocks are censorship resistant. Source: Etherscan.io Specialized builders can order transactions within a block, constructing maximally prof