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My thoughts: use optimistic rollup, but only submit hashes (or something equivalent) to get around relative-chain-speed issues.
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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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