Block Builder Separation

Definition ∞ Block Builder Separation is a design modification in blockchain architecture that distinguishes the role of proposing a block from the role of selecting and ordering transactions within that block. This architectural change aims to mitigate certain forms of maximal extractable value by decentralizing the block construction process. It distributes the power over transaction ordering, promoting a fairer and more equitable inclusion of user transactions. This separation helps prevent a single entity from having undue influence on block contents.
Context ∞ Block builder separation is a significant topic within the Ethereum ecosystem, particularly in the post-merge proof-of-stake era, as a method to address MEV concerns. The discussion centers on its effectiveness in reducing centralization risks and improving network fairness. Future developments include evaluating various proposer-builder separation designs and their practical implementation to optimize decentralization and censorship resistance across validator networks.