OP, are you are of existence of OpenBazaar? AFAIK it's most decentralized marketplace i've seen, although i never buy anything from there since it's far from user friendly.
No I didn't know. But it appears dead now.
Yes, it's effectively dead. Their website claim version 3.0 coming soon, but there's no update in almost 2 years since they announcement upcoming version 3.0.
I have few questions, where and how the data (such as destination address and location of the package hold by seller) is stored? Surely it's not public blockchain which can be seen anyone, right?