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Marketplace is indeed a pain in the a**. I just think it's very hard to do these kind of checks. A massive amount of posts are posted everyday.
One option would be KYC verification for all BCT users, so that you can ban people forever... Don't think that that's gonna happen soon...
why KYC ?! you know Many users used Fake Name do not be Another bittrex !!

you're IP address better than KYC !
and ID verification Can Forged Easily and scammer They have experience Counterfeiting
bitcoin and crypto Solved human errors why you are want Returns this errors ?