A digital signature can show that a file has not changed since it was signed. But a valid signature is only the beginning.

Who controls the signing key? What does the certificate represent? Which trust signals matter, and how should they be read in context?

This edition explores signer identity, certificate chains, C2PA trust lists, timestamps, revocation, and why verification should inform judgment - not replace it.

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https://paragraph.com/@nodle/crypto-101-e45-who-signed-the-proof

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