Definition
A valid signature and a recognized chain are different ideas. C2PA Signer keeps Signed but untrusted separate from Trusted so reviewers can see that difference.
Glossary
C2PA Trust List
A C2PA Trust List is a configured trust source used to decide whether a certificate chain is publicly recognized.
How C2PA Signer uses it
The extension turns technical evidence into clear report fields and the four statuses: Trusted, Signed but untrusted, Invalid and No credentials.
Responsible interpretation
Use this term to describe available evidence. Do not use it as a claim that unsigned or uncredentialed media is false.