2/n Interactive rollups like Arbitrum Rollup and Optimistic Rollup require waiting periods before you can withdraw so that a validator can challenge an incorrect withdrawal. This means that it takes a while to withdraw your money out which is bad UX.
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3/n Atomic swaps are a great solution to this problem. If Alice has ETH inside the rollup that she wants to get onto the main chain, Bob can swap his on chain ETH for her rollup ETH. The reason this works is that Bob can guarantee that the rollup will pay.
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4/n Atomic swaps work because Bob can guarantee that a proposed rollup block will be accepted if it's valid. In Optimistic Rollup this is trivial since a block can only be rejected if it's actually invalid. Valid blocks will be confirmed.
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4/n In multi-round interactive rollup individual interactive challenges can't determine whether a block is valid (disputants could collude). Therefore naive protocols must reject challenged blocks to be safe.
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5/n Arbitrum Rollup is multi-round, but achieves this same guarantee that proposed blocks will be accepted if valid. This allows us to support atomic swaps and other benefits of trustless finality. Find out how by reading the post.
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