I'm actually not that interested in hiding the listings. If every listing is an illegal item, then you can conclude that every person who engages in a trade in that market is doing something illegal, but if 5-10% of the listings are legal items, like on SR, and many sellers would put up dummy legal listings for their protection -- and there's no reason it couldn't be a general market anyway, I mean why do Amazon and eBay need to know what you are buying? -- then you get plausible deniability. The important feature is that the products involved in each trade are unknown to third parties. Of course, the escrow agents would find out about some of them, but if 95% of transactions complete successfully, the situation is much better than it is now. And as I argued last night with some folks, in the *worst case scenario*, you get exactly what you have now. A trusted third part escrow agent learns your entire transactions history.