This is a very interesting article.   A couple of things:

It would be useful to have one or two examples of customers - generic descriptions are fine.  Also, it would make sense to illustrate this article with a diagram showing how blockchain (in this context) works to enhance security.

I'm guessing that until more people with purchasing power in the minerals and mining space demand it or some kind of regulatory force intervenes, it will be tough to gain traction.   This application of the technology has potential to be a major disruptor in the precious metals space (and well beyond in the arena of supply chains), and, for that reason, a lot of people will be as scared as they are intrigued.