L2 Rollup Sequencing

L2 rollup sequencing is the specific process by which transactions on a layer-two network are ordered before being bundled and submitted to the layer-one blockchain. Because rollups process transactions off-chain to achieve scalability, the sequencing process is vital for ensuring the integrity and correctness of the rollup's state.

Different rollup designs have different approaches to sequencing, ranging from centralized to decentralized models. The sequencer's role is to collect, order, and execute transactions, and then provide a proof of validity to the main chain.

This process is a key part of the rollup's security model and directly affects the user experience, including transaction latency and finality. Understanding L2 sequencing is essential for evaluating the performance and security of modern scaling solutions.