How can I verify a Bydgoszcz City Card ticket's validity?

Information on the validity date of a purchased ticket assigned to the Bydgoszcz City Card can be found on the confirmation of the purchase of a ticket issued by sellers or printed in stationary ticket machines. The validity of the ticket can also be checked on OPS validators, by ticket controllers, stationary ticket machines, the seller at the ticket sales point or by logging in to the website www.bydgoskakartamiejska.com.pl