Provenance lives in the container, not the eye.

A manifest can describe an asset without changing the image a person sees. Rebuilding an image from decoded pixels creates a fresh container without copying supported metadata blocks. It does not change what may already be visibly written or encoded into the pixels.

The File workbench performs decoding, sanitization, C2PA inspection, and output creation locally. The Fastify application has no file-upload route, and the browser does not send the selected file to Primosa.

• PNG is exported losslessly from the decoded canvas.
• JPEG is recompressed at quality 95 and can change slightly.
• SVG active content and external references are removed along with metadata.
• An unverifiable result is refused rather than offered for download.