
The other option....
Is everyone has all the data. May seem crazy but stick with this thought for a moment:
In this situation if I need to prove that you are who you say you are (lets say for purchasing) - then I can use as much of the data as I want to satisfy myself that not only are you that person you say you are but you also have the means and funds to purchase what you want. That purchasing record then becomes another piece of data that everyone has access to. This omni-data model would initially need to be inviolate (well at least cascade change proof) (blockchain all over again) - but as contradiction cannot exist in nature the data would self-correct as more is collected.
Ransomware only exists because companies and individuals hold data no one else has got - if we all have it all there is nothing to ransom.
And if this omni-data is used nefariously - well that becomes part of the data and the nefarious agents become visible for all to see....
Hmm might have overdone it with the meds.....