I find it difficult to believe that taxes can be charged on something that has "no intrinsic value". The prices of crypto's vary so much that it is near impossible to place a value on them until they are cashed out. If, as @practicalthought said, that taxes are charged on crypto earnings, one could end up paying far too much in taxes. Suppose you earn Steem at $6 each and pay taxes on 1,000 Steem; That means you pay taxes based on earning $6,000 USD. Then you cash out your Steem at $1 each and only earn $1,000 USD. You just paid 6 times too much tax! Then the opposite could happen and you can bet your bottom dollar they will want a share of the GREATER amount and NOT the amount you already paid them. I can't see filing taxes on crypto until such time as you actually convert to your native currency, which LOCKS IN the supposed "intrinsic value".