Flashbots recently announced BuilderNet, a new block building network aimed at addressing the centralization issue in Ethereum's block building market, currently dominated by two entities: Beaverbuild and Titan. This duopoly has led to suboptimal outcomes for users due to maximal-extractable value (MEV) being concentrated in the hands of a few. BuilderNet seeks to decentralize the block building process by allowing multiple stakeholders—including block builders, searchers, and decentralized applications (dApps)—to operate concurrently in a multioperator network. This mechanism will enable the distribution of rewards based on the value contributed to each block. Transactions submitted to a block builder via BuilderNet will remain private, utilizing a trusted execution environment (TEE) to protect order flow data. Additionally, BuilderNet is designed to level the playing field for independent searchers and mitigate the capture of MEV by exclusive agreements and vertical integration tactics employed by current block builders. Although focused on Ethereum's Layer 1 for now, there are plans for expansion into Layer 2 solutions, including its integration into Unichain.

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