The blockchain proofs can be live and users could use blockchain explorers to verify the live data for themselves. The blockchain I plan to use could provide real-time blockchain proof of the obligations of the marketplace. The scammers would be solved by using feedback mechanisms I briefly described in my other responses. People should always be very skeptical of marketplace users with low or bad feedback and all marketplace users have an incentive to keep their feedback clean.
Well, that will work too, but at the start when people will start to test out your marketplace. Then your platform might already be filled with scammers then how will you deal it then. Because until other users will not test out other party with his/her money or digital goods. Till then they can not give reviews about them. And in my thoughts, When you are making a new platform you must try to put as much effort as you can in building trust.
You have to look from all sides. As people are already very frustrated with the recent payment hack in which millions of dollars are already gone i think the name is
Alphapo. Well, again best of luck