I'm not a lawyer, but this reads like offering shares in a private company. No matter how you knock this up, a corporation or individual ends up with ownership and control in the real world. You need a real-world way to enforce whatever they promise, which is either through civil law via contract or criminal law via fraud.
All crypto is is a signature on a document. These documents are not guaranteed to hold up in court, especially when there isn't good case law around whatever you invented to get around existing laws.
