[themantalope]

Interesting but how would this prevent against “off-chain” collusion? A fraudulent seller captures brokers on the buy and sell side? Seller backs out of the deal unless they know who the brokers are?

I think this kind of behavior in principle would be detectable but in principle with enough concentration in the market, a fraudulent seller could in practice get brokers and jurors to collude with them.

[kalenvale]

Once a trade has been initiated, sellers won't be able to back out. The seller has no control over the pseudo-random broker selection for their trade, hence can't choose a preferred broker either.