C2PA and Content Credentials explained
Understand what Content Credentials can technically establish, how signatures are checked and where their meaning has limits.
C2PA is a technical standard for signed provenance and editing information. Content Credentials are a common presentation of that information. A manifest can describe which organization or tool signed an asset, which production actions were declared and which asset the signature covers.
A valid signature means that the signed information has remained technically consistent since signing. It is not a general truth assessment. If no Content Credentials are present, that does not establish authenticity or whether AI was used.
What a checker evaluates
A checker first looks for a C2PA manifest. When one is present, it evaluates the manifest structure, cryptographic signatures and the binding to the inspected file. It can then determine whether the signer is recognized by the trust policy used in that environment.
These steps answer different questions:
- Manifest present: The file contains Content Credentials that can be parsed.
- Signature technically valid: The signed data is cryptographically consistent.
- Asset binding valid: The inspected file matches the signed asset.
- Signer trusted: The selected trust policy recognizes the certificate chain.
A technically valid manifest can carry declared information without guaranteeing the truth of every statement. Conversely, a file without a manifest can still be correct and unmodified. Results therefore need to be expressed as bounded technical statuses.
Reading common statuses
“Valid Content Credentials found” means the inspection succeeded for this asset. “No Content Credentials found” describes only the absence of a parseable manifest. “Tampered” indicates that the file no longer fully matches the signed asset binding. “Indeterminate” can occur when required information is unavailable or the inspection environment cannot complete an assessment.
An untrusted signer is not automatically a malicious signer. The local trust list may simply not recognize the certificate chain. Signature status, trust status, inspection environment and technical limitations should therefore be reported separately.
A practical inspection workflow
- Inspect the final publication file, not only the source in an editing application.
- Record whether a manifest was found.
- Review signature, asset binding and trust as separate dimensions.
- Compare declared actions with the documented production workflow.
- Repeat the inspection after a platform download or transcode.
This is why ContentSignal does not use blanket labels such as “real” or “fake”. The C2PA Checker reports technical findings and their limits without turning them into a general authenticity or AI-detection claim.