The question of what you truly own with Bitcoin has been a topic of legal and technical discussion over the past decade. Generally in the legal sense ownership is thought of in regards to property, where possession of an object and the ability to show an audit trail can prove ownership. For example, it is easy enough to prove you own the home you live in by showing the corresponding legal documents. For bitcoin Knut believes that ownership comes in the form of showing control over portions of previous UXTOs or block rewards. Instead of showing a legal document to prove ownership the corresponding private key proves that you are the owner of a unique asset on the blockchain. In this regard, bitcoin is a unique digital asset in that there is a true ability to show ownership.