Glossary
Espresso
A shared-sequencer network that orders transactions for many rollups simultaneously — built on HotShot BFT consensus with restaking-secured validators.
Espresso operates a separate shared-sequencer network that orders transactions for any rollup that opts in. The HotShot BFT consensus provides sub-second finality on ordering, and validators are secured by restaked ETH via EigenLayer plus the protocol's own ESP token.
The model lets multiple rollups share one ordering layer, enabling cross-rollup atomic transactions and replacing single-operator sequencers with a decentralized one. Espresso integrates with the OP Stack, Arbitrum Orbit, ZK Stack, and others.