AI BriefingVerify if a file was generated by Claude (2-minute read)
Key point
Anthropic has released a browser-based file verification tool that uses C2PA metadata to determine if files were generated by Claude.
Details
Anthropic has released a verification tool to check if files were generated by Claude. This tool operates entirely within the browser without requiring users to upload files, ensuring that files do not leave the device and protecting privacy.
Verification Method and Scope
The tool detects signed provenance metadata following the C2PA (Content Credentials) standard. Images or audio files generated by Claude include cryptographic signatures indicating that the file was created or processed through Claude.
- Supported formats: JPG, PNG, GIF, WEBP, TIFF, HEIC, AVIF, SVG, DNG, JXL, MP4, MOV, AVI, WAV, MP3, M4A, FLAC
- How it works: It reads C2PA credentials contained in the file's metadata to determine if it is related to Claude.
- Limitations: Watermarks in text cannot be verified with this tool; text detection is provided on a limited basis via a separate API for compliance with EU regulations.
Privacy and Interoperability
The verification process is handled locally, so files are not stored or used for other purposes. Since C2PA is a standard also used by camera manufacturers and photo editing software, interoperability is ensured with verification tools from other AI model providers (such as OpenAI and Google).
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