I've looked at this XCP thing. it doesn't have prices in the orders... why would I buy something at an unknown price? that's what an exchange does. its a price-machine so to speak. I mean this design is like a car that doesn't drive. its completely absurd.
at least they are not taking money for the dev upfront, so that's good.
I don't think anyone has even come up with a solution for a simple Decentralized limit order book. Seems to me that a Decentralized exchange can be gamed with common latency arbitrage / high frequency market making techniques..
yes. people designing an exchange should know what they are talking about. none of this stuff works, for quite obvious reasons. limit order book is a central datastructure like the blockchain. if you think about it bitcoin is de-central and central at the same time. blockchain is the ultimate central datastructure.
I haven't studied NXT at all, only looked the source code for 5 seconds. all current projects MSC, NXT, eth, have not considered much what an exchange is, in terms of price discovery and settlement.