Two traces require two different instruments.

The source prose is transmitted to OpenAI with instructions to change phrasing and sentence rhythm while preserving claims, proper names, numbers, citations, language, and paragraph intent.

Because Anthropic offers no public verification detector, no independent test can certify that a statistical mark has been removed. A rewrite is also not proof that a person authored the text.

Files never leave the browser. PNG and JPEG pixels are decoded into a fresh canvas, then exported into a new container. SVG is parsed as XML; metadata and active content are removed before serialization.

The official C2PA browser SDK inspects supported bitmap files before and after. JPEG is recompressed at quality 95, so small visible differences are possible.

• Unsupported or mismatched files are refused.
• Images above 10 MiB or 40 megapixels are refused.
• An output is withheld if supported metadata cannot be checked as absent.
• Every rewrite should be reviewed for fidelity before use.