Isn't a Git commit enough as proof?

A Git commit can be backdated with git commit --date. It's an internal versioning tool, not independent proof. ProofStamper uses a third-party timestamp authority (RFC 3161) that certifies the date in an incontestable manner.

Is my source code sent to your servers?

No, never. All processing happens locally in your browser. Only the cryptographic fingerprint (SHA-256) — a unique identifier that cannot reconstruct your code — is sent to obtain the timestamp.

Can I timestamp an entire project in a single ZIP file?

Yes. Compress your project as ZIP or TAR.GZ and drop it. The SHA-256 fingerprint covers the entire content. If a single byte changes, the fingerprint will be different.

Is this proof usable in a commercial litigation context?

Yes. The RFC 3161 certificate is a recognized technical proof of anteriority. Combined with a bailiff's report, it constitutes strong evidence to establish the existence date of a file.

Timestamp your source code — Certified proof of anteriority

An algorithm or feature can be claimed by anyone

First scenario: a freelance developer delivers a feature to a client, who then claims to be the intellectual author and refuses to pay. Second scenario: an independent developer creates an original algorithm, a competitor releases the same one a few months later and disputes authorship. In both cases, a Git commit or email is not enough — they can be backdated or contested. Only a timestamped proof from a trusted third-party authority is technically unassailable.

A certified fingerprint of your code, outside your Git repository

I'm finalizing a stable version of my code or a technical deliverable.

I generate a timestamped proof of my project's ZIP file before delivery or publication.

I can prove this exact version existed at this date, independently of Git.

The code never leaves my device. Only the SHA-256 fingerprint is transmitted.

Accepted formats: ZIP, TAR.GZ, JS, PY, SQL, compiled binaries — all formats

3 steps, 30 seconds

Drop your file: Project ZIP, source file, compiled binary…
Automatic certification: SHA-256 hash computed in the browser + RFC 3161 timestamp via FreeTSA
Download your Proof Pack: Readable PDF certificate + .tsr token verifiable by any RFC 3161 compatible tool

Why not just use Git?

Git is a versioning tool, not an external proof tool.

Criterion	Git Commit	GitHub timestamp	ProofStamper
Backdatable	Yes (git commit --date)	No	No (external TSA)
Platform dependent	No	Yes (GitHub)	No
Code confidentiality	Local	Hosted	100% local
Independently verifiable	No	No	Yes (RFC 3161)
External technical proof	No	No	Yes ✓

Protect every key step of your development

Client delivery — Prove the exact date a technical deliverable was handed over.
Software patent filing — Document the anteriority of your invention before any publication.
Proprietary algorithm — Freeze a version of your algorithm before sharing or collaboration.
Pre-open source version — Timestamp your code before publishing it under an open license.
Compliance audit — Prove the exact state of a system at a specific date.
Non-regression proof — Certify that a version passed tests at a given date.

Frequently asked questions

Isn't a Git commit enough as proof?: A Git commit can be backdated with git commit --date. It's an internal versioning tool, not independent proof. ProofStamper uses a third-party timestamp authority (RFC 3161) that certifies the date in an incontestable manner.
Is my source code sent to your servers?: No, never. All processing happens locally in your browser. Only the cryptographic fingerprint (SHA-256) — a unique identifier that cannot reconstruct your code — is sent to obtain the timestamp.
Can I timestamp an entire project in a single ZIP file?: Yes. Compress your project as ZIP or TAR.GZ and drop it. The SHA-256 fingerprint covers the entire content. If a single byte changes, the fingerprint will be different.
Is this proof usable in a commercial litigation context?: Yes. The RFC 3161 certificate is a recognized technical proof of anteriority. Combined with a bailiff's report, it constitutes strong evidence to establish the existence date of a file.