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Cross-Domain Collaboration Meets Optimistic Rollup (OR) A DAC is a cluster for cross-domain collaborations. OR moves transactions off-chain onto a layer 2 sidechain, which is secured by the main chain. DAC lives on the internet and blockchain, all the collaboration activities are programmable, recordable, and traceable. DAC is set to accomplish some business goals, so it is the same concept as a DApp, and the incentives mechanism will flow naturally as the results of collaborations.