If I say my passport number is 134563543, how does anyone check that? Is there a database of passport numbers and identities that can be checked?

I get that the ID process of camera-and-passport can be spoofed, but in the context of this particular data breach, that's irrelevant. If I can dummy up a passport that looks good enough over 240p resolution then it doesn't matter if it's my actual number or whatever. The process I've been through checks for the watermark/sheen on the passport, but if you can dummy a face then you can dummy some glittery lights fine.

My original question stands: do you just need the passport number to prove identity? Because I've never had to provide just that as proof of identity.