What is 'Bad Checksum'? Follow 'Bad Checksum' means part of the details you have entered are incorrect. Please check what you have entered and try again. Related articles Who sells on Ticketmaster Resale? / Who are the sellers on Ticketmaster Resale? Who is Ticketmaster Resale? What is the Buyer Guarantee? / How am I protected as a buyer? Are you associated with Ticketmaster? What is ticket resale?