A missing thing in this article: How do I know that public key X is associated with entity Y? The answer is not “contact entity Y” because I don’t know who Y re

A missing thing in this article: How do I know that public key X is associated with entity Y? The answer is not “contact entity Y” because I don’t know who Y really is or how to contact Y. This is the fundamental issue which causes centralization (aka “trusted entities” who certifies a claim).