RE: Self sovereign digital identity.

With everything moving online, these will come into play a lot more. I can definitely see a digital passport with lots of information tied to it. Maybe 2FA to let them access certain parts like with keychain.
Your legal history, medical records, bank accounts but those are professional services which i would like to keep well away form my social activities. That is when you need a system operating outside of government control so that they cant use it against you.

You post an anti-government blog and they lock your travel rights or your bank accounts. It could happen all too easily in some countries.