There have been many attempts to create a working decentralized marketplace using cryptocurrency for transactions. Projects like Bitbay, Syscoin, the NXT marketplace, and Openbazaar have gained attention over the past few years building this vision. However, another concept announced back in the spring of 2015 called Drop Zone remains in the background. The proof-of-concept may offer yet another method of operating a censorship resistant marketplaces in the future.
https://news.bitcoin.com/coming-up-drop ... t-service/