Asset Escrow/Transfer Service

Here’s a video demonstration of a neat Asset Escrow/Transfer Service for Dogeparty

I hope he’ll make a version for Counterparty too. 
Btw, is it (or will it be) possible to sell/buy ownership on the DEX?

You mean to transfer asset ownership? Maybe you can create a request on Github.

(I can’t see the video because I’m in a place where YouTube is blocked, but I’ll take a look tomorrow when I get full access to the Internet)