Wake up and see that nothing is taxable except people.
Who else are you going to tax? Tax is simply one person stealing from another. It is a group of people stealing from others. If they weren't stealing, it would be donations by the others.
You can't tax the land. You might be able to rape the land in the sense that you do not replace the natural resources that you take from it.
You can't tax the animals. You might force them to do work for you, like an ox turning a water pump. But this is more like slavery.
How can you tax Bitcoin? Bitcoin is simply an encrypted ledger called a blockchain, and the method for accessing the ledger. You can't tax it. You might be able to mess with the encryption somehow. But that isn't taxation. It is simply "playing" with some form of mathematics.
It is only the people who are taxable. Bitcoin might be some kind of a measure as to how much the people are taxed. But it is still only the people that are taxable. And taxation is essentially a group of people stealing property from other people for the benefit of the thieves and robbers who do the stealing.