Over the past couple of years, Ethereum rollups have taken two different directions in scaling the base layer, categorized as Optimistic and Zero-Knowledge. Both technologies have seen some level of adoption, with Arbitrum being the most notable Optimistic chain and DyDx taking advantage of ZK technology for its leveraged trading application. Like DyDx, ZK rollups have historically focused on offering a single type of application per chain, because the full Ethereum environment that offers customizable smart contracts would be too computationally extensive.
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