You could say you“own” or “control” #bitcoin whereas another person with bitcoin on an exchange like Coinbase does not own or control #bitcoin, but the nuance would be lost on a neutral listener
The dilemma stems from our current state of not being able to differentiate between cash and credit in modern #fiat world. Going back to a pre-#fiat world, the wording used would be “payable in specie” or similar specific wording