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A key part of this: what makes it harder than if the tokens were flowing the other way? What can you do about that?
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A fun/interesting cross-chain questions: SC is a smart-contract Ethereum and P is a program on Solana. Alice is supposed to send 1 Solana based token (SPL token) A to P, and has an ERC20 token E in SC. SC is supposed to release E if she does send A to P. Can you design it?
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Faster -- you don't need much of a timelock, and you can do it all in 1 step in ~99% of all cases, so it only takes a few block times beyond a same-chain swap. Also cheaper, because you generally don't need to go through that process (by being optimistic)
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