Optimism is a network of chains called the Superchain, built on the open-source OP Stack. OP Mainnet was the first chain, with several others now operating on the OP Stack architecture, including Base (by Coinbase), Unichain (by Uniswap), Ink (by Kraken), and World Chain (by Worldcoin). The OP Stack serves as a framework for Ethereum Layer 2 chains and supports significant L2 activity. Every OP Chain in the Superchain contributes back to the Optimism Collective and all chains follow a standardized revenue-sharing model: the greater of 2.5% of total chain revenue or 15% of onchain profit (defined as fees minus L1 gas costs) is paid back to the Optimism. By aligning economic incentives across many chains, Optimism aims to transform Ethereum scaling into a sustainable flywheel by delivering fast, low-cost transactions while reinvesting in the future of the ecosystem. OP holders participate in governance to shape protocol upgrades, funding decisions, and more

Nexus Mutual is a decentralized insurance protocol built on Ethereum that currently offers cover for smart contracts on the Ethereum blockchain, currently covering all the main defi protocols. Nexus Mutual offers coverage against smart contract failures, which protects against potential bugs in smart contract code.  The coverage intends to provide protection against financial losses that may be incurred due to hacks or exploits in the smart contract code. Note that smart contract cover only protects against “unintended uses” of smart contracts, so security events such as the loss of private keys or centralized exchange hacks are not covered. In December 2020, it released custody cover covering centralised custodians and lenders such as Celsius, Blockfi, and Nexo.