Supply md5 hash of first name + last name + seed when buying, computed manually by yourself. Upon arrival at the venue you show photo id and a sheet of DIN A4

Supply md5 hash of first name + last name + seed when buying, computed manually by yourself. Upon arrival at the venue you show photo id and a sheet of DIN A4 paper containing the hash and seed, and the Ticket Man will verify. Side joke: One of the German ticket sites, maybe eventim, stated on the PDF that it must be printed on DIN A4 paper.