You dont own the blockchain you have rights to spend the coins and move it around on the bitcoin blockchain network.So there exists an account on the blockchain that requires a certain key in order to legitimate entries of an accounting unit called a BTC and these entries must then be submitted for validation across the network of computers running the blockchain, correct?
So what is "it" that you "own"?
Ah, yes. Humanity's impulse to rebellion and claimed "liberation" from "tyranny." I'm sure this time it'll work out.
In the banking world your ID and biometrics tells the banks that the money on their database belongs to you. In the blockchain world it is the private key or password that does the same thing. In banks you dont own the money either, the money in your balanace is a representation of what the bank owes you. It's an IOU and can be revoked by the bank or the government at any time.