C2PA and content provenance
C2PA defines ways to bind signed assertions to the history of digital content. It supports provenance checks but does not make a media file indisputable evidence of what it depicts.
What a manifest records
A manifest may include declarations about origin, edits and tools, together with signing mechanisms. Distinguish the claim issuer, cryptographic validation and the real-world events that are depicted.
Presence, absence and continuity
Provenance information may be absent, stripped or unsupported by software without proving that media was manipulated. Conversely, a signed assertion can be technically valid yet incomplete or misleading.
Questions worth asking
Who signed the claim? What does the signature cover? Which edits are disclosed? Can an earlier media asset be found and technical history compared with independent evidence?
Responsible use
An archive may retain C2PA metadata alongside acquisition methods, rights and an edit timeline. Provenance complements investigation rather than replacing it.
Validation of assertions and signatures
A C2PA manifest can bind media to assertions about origin, edits and tools. Technical validation confirms certain cryptographic relationships within its scope, but does not automatically prove that the scene depicts a real event. Missing metadata also does not establish manipulation; copies and platforms may fail to retain it.
Exercise: compare two image versions
Choose authorized media with provenance claims and a re-encoded copy. Inspect available manifests, claim continuity, signatures and reported edits. Complement technical review with an independent source and visual comparison. Limit conclusions to observed evidence and record what remains unknown.
Core steps
- 01Locate the manifest
- 02Inspect the assertions
- 03Validate signatures
- 04Cross-check the facts
Three questions to ask
What exactly does the signature demonstrate?
Are acquisition and editing conditions documented?
Is absence of metadata interpreted cautiously?
Read the source documents
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