Well, even if silkroad played a big part in the development of the bitcoin, we must not forget that it was a big black market. And if I remember correctly, you could find more than simple weed on this website.

I don't know if there is similar system nowadays, but I don't think that associating cryptocurrency with black market is the best thing to do, even if we must admit that cryptocurrencies are used a lot in those markets.

With Paragon, it would be in places where it is legal. The main objective of Paragon is to help the cannabis industry by industrializing the whole process, collecting data on every products, giving a strong support to the legalization of majijuana.