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RE: Using a BitShares Decentralized Exchange (DEX) market for BitUSD and BitCNY pricefeeds
Just a few comments:
Witnesses were not convinced to fake the price feed. They were coerced. Several witness reported to have been outvoted for refusing to do the faking.
Funny I thought this was the way it was designed. Before even knowing about witnesses.
I mentioned in one of the telegram channels that, in order to overcome the lack of liquidity in the DEX, and still use it for feeding price, instead of taking market price we could use the average of a given time window, let's say the last 4 hours.
It's true that they were coerced, but part of the narrative that explained away the coercion was the claim about manipulation on CEXs. If this claim can be proven false, then witnesses can't kid themselves that they are protecting poor marginers who are being unfairly attacked. And marginers would have to consider more strongly the damage they were doing to the ultimate value of BTS by such an obviously corrupt action.
Averaging over a time window might work, but it risks a case of insufficient collateral in the case where there's an abrupt drop in price. Margin calls have to be made rapidly in such cases.