Blockchain infrastructure company Espresso Systems announced that the Polygon zkEVM fork running on the Espresso Cortado testnet was back up and running last night and is ready for use. The team is still conducting further testing before asking Caldera to redeploy the Vienna OP chain, but the goal is to be back online tomorrow.

Yesterday, Espresso Systems announced that it had discovered and fixed some vulnerabilities in the Espresso Sequencer consensus that supports the Cortado testnet. The testnet has been closed while the team prepares and deploys the fix. The above vulnerabilities are contained in the Espresso Sequencer and have nothing to do with Vienna deployed by Caldera OP Stack. #Binance