Some governments tell you you have to "declare" that you "own" Bitcoin.
Now, how the heck do you do that, exactly?
In short, knowing a Private Key allows you to request that the network apply a specific alteration to the timechain that "moves" sats from one address to another.
But how can knowledge be equivalent to ownership in any legal sense?
And what happens if you utter the Private Key in court? Remember - the twelve magic words in a seed phrase are not a password - they ARE the key!
Now the entire court will be "guilty" of "owning Bitcoin."
And how do you prove that everyone else on Earth DOESN'T know the same twelve words?
Under man-made law, Bitcoin ownership is paradoxical. Under Natural Law, the keyholder simply IS the owner. No declaration is required, and no state is needed to validate it.
Study Praxeology! Read Rothbard!