As far as I know Bitcoin started evolving after the huge success of Silk Road (
https://en.wikipedia.org/wiki/Silk_Road_(marketplace)).
Be extremely careful if you set a black market. The first clients can be secret service agents. They can come with hundreds of
BTC and become your friends. Few month later you can be in a prison

.
You will only be in prison if you are doing something illegal, which is why most people explore the dark web anyway. I wonder who invented it in the first place
