I\'m searching for a way to find a unique number for every smart card I work with. I have heard there are IC Fabrication date, IC Serial Number and IC Batch Identifier that
For most usecases the PC/SC UID should be sufficient. This is a 4 to 7 byte identifier that is read anyway when building the contactless communication with the card. Although some cards may be configured to return random UIDs, however this is not a problem if you have the cards for your project under control