Definition ∞ Sequencer rotation refers to a mechanism in some blockchain scaling solutions, particularly optimistic rollups, where the role of the sequencer—the entity responsible for ordering and batching transactions—is periodically assigned to different participants. This rotation aims to decentralize control over transaction ordering and prevent censorship or malicious behavior by a single sequencer. It enhances the liveness and fairness of the rollup network. The process can be governed by a smart contract or a decentralized autonomous organization.
Context ∞ Sequencer rotation is a critical topic in the development and security of layer-2 scaling solutions, especially optimistic rollups. News often covers proposals and implementations designed to achieve robust and fair sequencer decentralization. Debates concern the optimal frequency of rotation, the selection mechanism for sequencers, and the economic incentives required to maintain a healthy and distributed set of participants.
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