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.

封存任意文件。证明您的所有权。

支持的文件格式

工作原理：任意文件，相同流程

上传文件

计算 SHA-256 指纹

发放合规时间戳

获取证书

公开验证

法律框架

谁在封存什么

视频创作者

开发者和初创企业

摄影师和设计师

建筑师和工程师

音乐人和制作人

法律与合规

常见问题

哪些文件格式可以封存？

封存文件能证明版权吗？

我的文件会被上传或存储吗？

文件大小限制是多少？

与 DocuSign 有何不同？

任意文件。两分钟。法律证明。