Crypto currency is decentralized. So there is no organization or institution or Government to be in charge of it. If there were some oversight institution that would defeat the purpose of it being centralized.
As the states legalize cryptocurrency, they determine its official status and, according to this status, take it under their protection, including judicial protection. Therefore, after the legalization of cryptocurrency, all of its owners, in the event of a violation of their right to own or use a cryptocurrency, can officially apply to law enforcement or judicial authorities to protect their right.
A cryptocurrency does not have its own defense authority, however, as a property, means of payment, property, securities, and so on, according to the recognized status, it is subject to general protection by the state.