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Competing Security Models for Appchains | Nick White, Dev Ojha

Bell Curve

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The Sequencer Layer in a Modular Stack

In a modular blockchain world, even though consensus is handled at the L1 layer, you also have to have a node or set of nodes that are running the roll-up execution. The sequencers do have control over ordering, so they do have an ability to sort of extract MEV. And they also kind of have an ability, if you want, to attest to the validity of the block they post. That can actually give you a measure of finality if you need it.

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