Glossary
Shared Sequencer
Infrastructure that orders transactions for multiple rollups simultaneously — enabling cross-rollup atomicity and reducing sequencer centralization.
A shared sequencer (Espresso, Astria, Radius) is a separate network of nodes that runs ordering for many rollups at once. Each rollup posts its blocks through the shared layer instead of through its own dedicated sequencer.
The model unlocks cross-rollup atomic transactions (lock funds on rollup A iff a swap on rollup B succeeds) and replaces a single centralized sequencer with a decentralized one. Adoption is still emerging; most production rollups still self-sequence as of 2026.