UBI is a great idea, but I don't think most governments will be interested in it unless they are very progressive because there is a conflict of interest in the control of the monetary system. On a global basis, it could be done if there were a one-to-one correspondence between a digital ID and a person. Payments to the ID could be easily made, and any withdrawal could be scrambled to the point where they are very difficult to trace unless multiple parties agree that there is a possibility that a crime has been committed.