https://en.wikipedia.org/wiki/Zero-knowledge_proof

Yeah...I'm fully aware what a ZKP is..you're just missing the point.

Why did you write that then:

> You then still need a trusted ID service or algorithm to capture an image of the user _at the time of use_ to compare that to.

> Just having access to your digital ID credentials proves nothing

Because it's accurate?

If I have access to your digital ID I shouldn't be able to impersonate you anymore than I should be able to fly using your passport.

Your passport is useful not just because it's difficult to forge, but because border control is a thing.