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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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SBF

@SBF_FTX

Jul 27, 2020

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?

3:55 PM · Jul 29, 2020Twitter Web App

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Will there be airdrop of SRM token to #FTT holders?

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twitter.com/FTX_Official/s :)

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FTX

@FTX_Official

Jul 27, 2020

We're excited to announce that 5% of all $SRM tokens will be distributed to FTX's $FTT holders over time! projectserum.com Details will come as Serum launches :)

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Rollups are lazy evaluated safety. I think a way to use that is push expensive compute that doesn't have a zk-proof and keep everything else executing on chain. For a solana light client on ethereum, it makes sense to rollup ed25519 signature checks, but not anything else.

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Then v2 can be either a precompiled call eips.ethereum.org/EIPS/eip-665 or a zk proof.