There are tax payers upon the profit they earn from bitcoin. Already some governments functional around the globe has initiated such a plan. Here the taxes were levied upon the transactions happening through the particular account. In specific traders who involve into btc to fiat trading were the one that pay taxes.
This can also be applied if they already know how they work. This is considered to be the profit taxpayers are most desired to date. Hope that should not happen or if there is a reasonable cost a bit.