Check if a file was made with Claude
Summary
The article explains Claude's content credential system (C2PA) used to verify if Claude contributed to a file. It distinguishes between watermarks in text and content-credentials in files, describes how credentials are embedded in file metadata, notes that the system can't reveal the user identity, and mentions a private Detection API and cross-provider tools. It contextualizes privacy protections and usage terms, with guidance on what happens to uploaded files.