Haven't heard of a domain register asking for a social security number specifically to verify ID, but have heard of foreign domain registers asking foreign regi

Haven't heard of a domain register asking for a social security number specifically to verify ID, but have heard of foreign domain registers asking foreign registrants to supply a photo id and/or passport number, or some other form of photo identification. It is completely possible that something changed in the last 5 years with the registration requirements that they now require additional verification (i.e. they opened domain registrations up to non-residents).