[Avi-D-coder]

Yes, it could replace all government ids, while allowing you to prove arbitrary statements about said signed government documents without revealing them (not saying it will happen).

[perching_aix]

Wouldn't those "documents" need to be code for that to happen?

[latchkey]

Let's say the usecase is to prove that you're 21+ to enter a bar in the US. I don't want to have to hand over my ID with my personal information on it.

On my phone, I could have the "proof", which can be validated by the door guard with a simple NFC device (ie: another phone) that is compatible with that proof.

[Avi-D-coder]

Those documents would need to be cryptographically signed machine readable data, json, a pdf (difficult).

Getting governments, banks, and other trusted third parties to sign documents is very difficult, but is happening in some cases.