+ "layer-2-rollups-2": "The transaction data in the rollup is submitted to layer 1, but the execution is done separately by the rollup. By submitting transaction data onto layer 1, rollups inherit the security of Ethereum. This is because once the data is uploaded to layer 1, reverting a rollup transaction requires reverting Ethereum. There are two different approaches to rollups: optimistic and zero-knowledge - they differ primarily on how this transaction data is submitted to L1.",
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