Definition ∞ Sequencing mechanisms refer to the processes that determine the order in which transactions are processed and added to a blockchain. These mechanisms are crucial for maintaining consensus and preventing issues like front-running or transaction reordering attacks. They directly influence the finality, security, and fairness of a decentralized network. Different blockchain architectures employ various sequencing strategies.
Context ∞ The design of sequencing mechanisms is a critical area of research and development in scaling blockchain networks, particularly for rollups and layer-2 solutions. A key debate addresses the centralization risks associated with certain sequencer designs and their impact on censorship resistance. Future innovations aim to decentralize sequencing further and enhance transaction ordering fairness.
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