In brief, There’s in all probability no authorized option to inform with out his cooperation or with out having seized all his computer systems, telephones and different units and data by means of using a courtroom order or different authorized course of (however seek the advice of a lawyer for authorized recommendation).
The inventor of Bitcoin supposed to guard the privateness of Bitcoin customers and prevented having any information within the Bitcoin protocol that might determine individuals.
Bitcoin was designed for use to carry cash and spend it without having any involvement by third events in any respect, together with no want for fee processors, exchanges or different companies. There aren’t any centralised data of who holds Bitcoin, it’s like peculiar types of money in that respect.
Companies that present any sort of accounts for patrons are usually required by legislation to guard the privateness of their clients. There are in all probability 1000’s of companies that supply accounts for holding Bitcoin, many of those companies will likely be in different international locations than you might be.