Obviously, if you have Bitcoins and you live in a country where they are taxed, you must pay them. You must get in contact with the person who makes your taxes for you and ask them what you need to do. If that person doesn't know either, find yourself another because cryptocurrencies will be more and more common in our lives, and people who don't know about them and do that sort of job should be considered inefficient at their job.
You must seek the advice of an accountant especially if the legal frame concerning cryptocurrencies is not very clear in your country, which is true for a lot of countries right now.
In fact, in many countries, in particular the EU, there is already clear regulation on bitcoin and taxation.
In my country, the tax office has already made and published an official opinion on how to report earnings from bitcoin and crypto.
Accountants still know very little about it because they have not had such cases or clients.
I know it from my own experience.