What is the eCard code on BLS?
As a seasoned professional in the world of cryptocurrency and finance, I'm curious to understand the intricacies of the eCard code on BLS. Could you elaborate on what this code specifically represents? Does it serve as a unique identifier for users? Or does it have a more technical function, such as facilitating secure transactions or authenticating user accounts? Additionally, how does the eCard code relate to the overall security and privacy measures implemented by BLS? Understanding its role and significance would greatly enhance my knowledge in this space.