At the current moment (and to my limited understanding), the IRS mandate only affects those situations from where you selling bitcoin to go into fiat, and vice versa.
If you read IRS Notice 2014-21 question number 8 it reads:
Q-8: Does a taxpayer who “mines” virtual currency (for example, uses computer
resources to validate Bitcoin transactions and maintain the public Bitcoin
transaction ledger) realize gross income upon receipt of the virtual currency
resulting from those activities?
A-8: Yes, when a taxpayer successfully “mines” virtual currency, the fair market value
of the virtual currency as of the date of receipt is includible in gross income. See
Publication 525, Taxable and Nontaxable Income, for more information on taxable
income.
That is pretty definitive to me!
I seriously doubt IRS has even the system in place to accomplish this type of tracking.
In fact, they simply don't unless they literally monitor mining pools. Good luck with that.
All they can see is me sending bitcoin into Coinbase and buying/selling.