How can I verify ProZ.com's participation in the special scheme VAT on e-Services?

Please refer to the following document to confirm ProZ.com's participation in the special scheme for the taxation of non-EU businesses which provide electronically supplied services to EU consumers: http://cdn2.proz.com/file_resources/other/f3471571b41f7c013cd0397910941498_Bestaetigung_Registrierung_ProZcom_engl.pdf

This form may be used by EU residents for tax purposes.