Blockchain infrastructure firm Espresso Programs has launched a testnet model of the Espresso Sequencer on a forked model of Polygon zkEVM.

The testnet, named Doppio, has been working inside the firm and shall be open to exterior nodes over the following few months.

Sequencers are chargeable for ordering transactions from the mempool after which sending the knowledge again to a digital machine. Just like validators on a layer-1 community, they play a essential position in working layer-2 blockchain networks.

Right now, sequencers stay comparatively centralized. Rollups run their very own siloed sequencers with their very own execution environments — and within the case of zero-knowledge (ZK) rollups, in addition they have their very own provers.

In an interview with Blockworks, co-founder and technique lead at Espresso Jill Gunter defined that present sequencers function in a comparatively monolithic means.

“In present rollup options, the sequencer is only a part bundled with the remainder of the rollup software program,” Gunter stated. “Nothing is programmable, upgradable or swappable in a very simple means.”

Because of this, many rollups right this moment have skilled some sort of downtime, one thing Gunter believes is downplayed in right this moment’s rollup setting.

“It’s not a complete catastrophe as a result of you’ll be able to all the time power the transaction again to the [layer-1],” she stated. “However that is perhaps prohibitively costly, and trigger what I name gentle censorship points the place the transactions aren’t being prioritized.”

How does espresso’s decentralized sequencer work?

Espresso has designed its very personal specialised proof-of-stake system — HotShot — that shall be used to optimize for the appropriate stability of efficiency whereas remaining decentralized and strong, Gunter explains.

“It’s a distributed consensus system that may be shared amongst completely different rollups, so not will a rollup should have the sequencer bundled inside their very own software program stack. They are going to be utilizing the Espresso [application programming interface] to name and submit transactions to the Espresso sequencer,” she stated.

The Espresso sequencer does two issues: It performs knowledge availability as an possibility — which means that if a rollup desires knowledge availability as one thing that’s additive, they’ll. It additionally performs consensus on the order of transactions. 

“The Espresso sequencer can do that throughout a number of rollups and there’s all types of attention-grabbing issues that occur if you begin having cross rollup ordering,” Gunter stated. “There’s potential for cross rollup MEV — which we predict generally is a income for individuals who are taking part within the Espesso community and the [layer-2s] as effectively.”

Supply: Espresso Programs

The workforce can be planning to leverage ETH staking to make sure there may be financial alignment with Ethereum layer-1 — that is at present within the works with Eigenlayer. 

Following the testnet launch on Polygon zkVM, Gunter notes that Espresso can be engaged on a partnership with Caldera to construct an integration between the Espresso Sequencer and the OP stack. There are additionally present agreements with Spire, Injective and Catalyst AMM to help them in prioritizing integration with Espresso’s Sequencer.

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