Espresso, a closely watched blockchain project to coordinate cross-chain transactions and interactions, shared Monday that its main product, known as the confirmation layer, has gone live.

According to the team, the confirmation layer will be a critical piece of infrastructure for composability among rollups, allowing for two networks to read and trust each other's blocks of transaction data. A rollup is a type of auxiliary, or "layer-2," network atop a main blockchain, providing a venue for cheaper and faster transactions.

Specific benefits of Espresso's new confirmation layer could include faster bridging of assets between networks, decentralizing a key component of layer-2 blockchains known as the "sequencer," and providing a way for networks to stash reams of transactional data at a low cost, according to the project documentation.

“It's literally a protocol for when a rollup sequencer publishes its blocks to, that once published on the confirmation layer, they can't be changed, even when that chain later settles them to Ethereum,” Ben Fisch, CEO of Espresso Systems, said in an interview with CoinDesk.

Essentially, this takes on the role of a sequencer today, and adds some security to it. Sequencers are a crucial piece of infrastructure in rollups, bundling up transactions from users of the layer 2 so they can be recorded on the layer 1, in this case Ethereum.