After you file

Most persons did not report crypto transactions in 2017, figuring they could get away with it.

This is very tedious since you don't get a consolidated 1099-B with all your transactions.

See Form 8949 for how to report crypto transactions, it is done just like a stock security.

Without a 1099-B, your Box Category is "C" (Page 1) or "F" (Page 2).

IRS has become more interested now in getting the report and the associated tax revenue, going forward.