they may have a 'check' digit somewhere showing which endings you have seen... that would be relatively easy
Band ID # 123456789
Band Name - asdf
Birthdate -
HM : 05/01/2016, 1; 05/11/2016, 2
Star T- 05/09/2016, 2,4,3,1;
it would just keep adding strings as you go --- like savegame stats for...