Question 1

What file formats can be sealed for copyright on Swiss Trust Layer?

Accepted Answer

Swiss Trust Layer seals any digital file up to 500 MB. Supported formats include documents (PDF, DOCX, XLSX, PPTX, ODT, TXT, RTF), video (MP4, MOV, AVI, MKV, WebM), audio (MP3, WAV, FLAC, AAC, OGG), images (JPG, PNG, SVG, TIFF, WebP), source code (JS, TS, PY, JAVA, and any source file), archives (ZIP, RAR, TAR, GZ, 7Z), CAD/BIM files (DWG, DXF, IFC, RVT, SKP), and any other binary file. The seal works on the SHA-256 fingerprint of the file, so any format is technically supported.

Question 2

Can I seal a video file to prove copyright ownership?

Accepted Answer

Yes. MP4, MOV, AVI, MKV, and WebM files can all be sealed with a qualified electronic timestamp under eIDAS Art. 41 and ZertES Art. 2. The seal computes a SHA-256 hash of the video's binary contents and anchors it to a certified timestamp issued by Swisscom Trust Services. Your video is never uploaded or stored. Only the fingerprint is processed.

Question 3

Can I seal source code files to prove software IP ownership?

Accepted Answer

Yes. Any code file (JS, TS, PY, JAVA, and others) or a ZIP archive of an entire repository can be sealed up to 500 MB. Under the Berne Convention Art. 5, computer programs are protected as literary works from the moment of creation. A qualified electronic timestamp provides independent, court-admissible proof of when that code existed in its exact form, stronger evidence than git commit timestamps, which are set by the developer's own clock.

Question 4

Can I seal an image file like JPG or PNG for copyright proof?

Accepted Answer

Yes. JPG, PNG, SVG, TIFF, and WebP files are all supported. The SHA-256 hash captures the exact pixel data of the image. EXIF metadata is separate from the hash and is not relied upon. The cryptographic fingerprint alone identifies the file. This makes the seal resistant to EXIF stripping, which happens automatically on most social platforms.

Question 5

Is there a file size limit for sealing?

Accepted Answer

The current limit is 500 MB per seal. For larger files, such as high-resolution video or large codebase archives, compress or export the file at the highest quality that fits within the limit, or seal the project at the archive level (ZIP of the full project). The SHA-256 hash uniquely identifies whatever file is submitted.

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