Coinbase's L2 network, Base, has announced the open-source monitoring system, Pessimism, aimed at helping to secure all OP Stack and EVM-compatible chains. Since its launch, the Coinbase team has been internally running Pessimism to monitor the Base mainnet. Base states that, in the spirit of contributing to the public good, Pessimism will be open-sourced as free and unlicensed software under permission from MIT.