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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/

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and

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.

SBF

@SBF_FTX

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@2xjump

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.

9:49 AM · Aug 29, 2020Twitter Web App

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and

It also comes down to: why do you want to use a DEX? Because you don't trust centralized custody or don't trust centralized execution? For most it's probably the former. So maybe a DEX where custody is decentralized but validation is done by a trusted federation might work.

Replying to

and

I think Serum or something similar is the best you can do for "fully-decentralized", but there are a lot (majority?) of people who like you said only care about non-custodial. For those people check out our new version launching soon.

idex.io

IDEX High-Performance Decentralized Exchange

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