I'm trying to wrap my head around it.. I have a couple of questions on this actually:
Is it supposed to have private key shared between buyers and sellers? Wouldn't that increase the chances of fraud?
And if the point of the swapping private keys is about fast transaction, isn't it counterproductive to create secondary wallet with that exact amount of coins and then swapping the keys?
It seems really weird to me it sounds like you pay via bitcoin but the money is put into a wallet and you then give them the key to that wallet to unlock it. Its really weird and seriously seems like a crap system to me where you are just creating millions of wallets and keys for no reason. If anything I see it cluttering up the system unless it is not on the blockchain and sits outside of it (could also be the case from what I am reading)