That's a very good question, because there has been a lot of hype about blockchain in recent years. Everybody talks about it, but we use it to make digital signatures secure. We started to use blockchain logic before the name was even invented. Once we issued the first ID card in 2002, blockchain logic was already implemented in the system.
What we basically do is to put the old digital signature or the fingerprints of the digital signatures onto the new digital signature. Basically, we link different digital signatures to each other so that whatever happens with encryption in the future, we can still have the secure link of the digital signatures.