They could tie the identities to governmental identities in a blind manner.

The pitfalls are as follows:

- the governments can just arbitrarily manufacture identities

- identities (govt and this) can be stolen

- identities can be misused (coercively or consensually, e.g. by passing on access to another person or automation)

Still would beat the current state of affairs, which is piss-all identity attestation, but then they're not actually doing this. They're scanning official documents and go LGTM + pinky promise. Hard skip.