Definition ∞ Sequencer security refers to the measures and protocols implemented to safeguard the integrity and reliability of transaction sequencers, particularly within Layer 2 scaling solutions on blockchains. This pertains to protecting the entities responsible for ordering and batching transactions before their final settlement on the main chain. It is critical for maintaining transactional fairness and preventing censorship.
Context ∞ Sequencer security is a significant discussion point for optimistic rollups and other Layer 2 solutions, as a compromised sequencer could lead to transaction reordering, censorship, or denial-of-service attacks. Debates focus on decentralizing sequencers, implementing robust economic incentives, and developing mechanisms for detecting and punishing malicious behavior. Ensuring this security is paramount for the scalability and trustworthiness of these solutions.
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