What I meant is trading for "real" PPC (or whatever cryptocurrency/asset/token with its own blockchain/ledger). I understand that CFDs could do the trick for short-term speculation (however; we need trusted broadcasts first). But as I am more of a long-term investor wanting to diversify, CFD are a bad option. I believe that even if the concept of BTC and XCP is here to stay - BTC and XCP probably are not. And I don't want them to take my CFDs with them when they go.
Neither do I favour an IOU-concept like ripple for my purpose (which, as I understand could work in XCP as well..).
But a nicely working trustless DEX would of course be revolutionary...
Agreed, a trustless DEX across blockchains would be rather special.
Did you see techo051's post?
I haven't had a chance to fully read it yet. It's talking about using BitMessage as a trustless mechanism to bridge across OT servers.
The ramifications if true is that it would be possible to create a trustless gateway service between a DEX and a disparate blockchain. ie purchase PPC in Counterparty and then trustlessly exchange it for 'real' PPC.