What is the key difference between a ZK-Rollup and an Optimistic Rollup?
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A
ZK-Rollups use zero-knowledge validity proofs for instant finality; Optimistic Rollups use fraud proofs with a challenge period
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B
ZK-Rollups are faster but inherently less secure than Optimistic Rollups
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C
ZK-Rollups operate entirely on sidechains while Optimistic Rollups are Layer 1 solutions
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D
ZK-Rollups only support simple token transfers and cannot execute smart contracts