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So tbh the best thing you can do to counter this on a DEX is to make it fast. Uncertainty over 400ms of ordering is soooo much less bad than uncertainty over 5 minutes. This is just so much less of a problem on Solana than slower chains.

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Matteo Leibowitz

@teo_leibowitz

Aug 29, 2020

‘if the DEX isn’t being front run by the validator set, is it really decentralized?’ twitter.com/teo_leibowitz/

9:36 AM · Aug 29, 2020Twitter Web App

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is a blessing to this generation.

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Still, the entity creating the block can frontrun any transaction in that block. Don't suppose there is any way around that without a trusted third party.

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yeah alas it's pretty hard. You could try to have timestamps on them, there are proof of time things in Solana that might help, but it's messy. In the end you do the best you can, and at least this is way better than the status quo.