IDEX 2.0, Built on OptimizedOptimistic RollupOptimized Optimistic Rollup (O2 Rollup) is a novel, open-source layer-2 design for bringing scalable applications to public blockchains.IDEX 1.0’s design hinges on the use of a deposit contract and a single authorized submitter address. This design enables the escrow of funds and coordination of trade settlement necessary to support instant, off-chain execution. The remaining drawbacks derive primarily from the fact that each trade is settled to the network one at a time. In order to scale beyond the current limitations of blockchain networks, we need a more efficient method of trade settlement.IDEX has developed a new method known as O2 Rollup that allows for unlimited off-chain scaling with a fixed on-chain settlement cost. To understand the new design, it’s helpful to understand a few core concepts of the Ethereum network.