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Source: CoinMarketCap Some are so optimistic that they think solana has ethereum in its sights.
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The difference between zero-knowledge-based rollups and Optimistic rollups, like the ones currently deployed on Ethereum by Arbitrum and Optimism, is that the former run computation off-chain and submit validity proofs to the mainchain, while the latter assume transactions are valid by default and only run computation, via fraud-proofs, in the event of a dispute.