Just read this article about proposed senate bill to CRIMINALIZE the intentional concealment of ownership or control of any digital currency known today or in the future.
https://themerkle.com/not-disclosing-ones-bitcoin-may-become-a-crime-in-the-us/ First with KYC rules for ico participation to SSN required for some exchanges to the listing of crypto as property which means any transfer or transaction is taxable. And yes if you have used bitcoin to transact you owe and it can be easily traced. Even that localbitcoins transaction.
This is the inevitable natural progression especially now with exchange listing coming shortly. Remember with US gov't it is never a matter of your intent, it is simply what can be proven ...
Be very careful US residents. If not already using coins that are already stealth, I suggest looking into them.
