They trade it as property. What is the big deal. I track when I buy them, and I track when I dispose of the asset. Just like I do with stocks, business assets, and, if I were ever to buy gold and silver, bullion.
As long as you are buying and selling them, it isn’t an issue. It’s when you’re mining them that creates issues. For instance, the value at the time they were mined. Who’s to say what the value was (i.e., which exchange value at the time). Seems to me the proper way to handle that would be to tax the asset at time of sell, instead.