I would be surprised that if you had been reporting your transactions (even as bulk numbers) on your schedule C that the IRS would have an issue now that they had details about those aggregates.

And since your bitcoin trades attached to your name can be linked to your tax returns I think they would absolutely know that you've already paid taxes on yours, and they will ask for your help in tracking down people for whom you did transactions so that they might connect their transactions to taxes that they have paid on them.