SoulProp

Prove you
created it first.

Cryptographic timestamps that hold up when it matters. We seal your file with a verifiable timestamp and give you the only key.

Seal a file $13 per seal

The problem

You create something — code, art, a design, an idea, a contract. Later, someone claims they had it first. A client disputes when you delivered. A competitor releases something suspiciously similar.

You know you created it. But can you prove when?

Current solutions fall short

Email to yourself Headers can be forged. Courts know this.
Screenshots Trivial to edit. No cryptographic proof.
Cloud storage timestamps Controlled by the provider. They can change.
Notarization Expensive, slow, limited to documents.

Our solution

SoulProp creates a cryptographic seal around your file. We request a timestamp from an independent authority (not us), encrypt your file so only you can open it, and store it securely.

You get a key file. This is the only copy — we don't keep it. When you need to prove when you created something, return with your key. We'll decrypt your file and provide a complete evidence package.

RFC 3161 Industry standard timestamp, used in legal proceedings worldwide
Zero knowledge Your file is encrypted. Without your key, we can't see it.
Verifiable Anyone can independently verify the timestamp — no trust required

How it works

When you seal

  1. Upload your file and pay
  2. We encrypt it and request a timestamp
  3. Download your .soulprop key file

Keep your key file safe. It's the only way to decrypt your file. Lose it and your file stays sealed forever.

When you need proof

  1. Return to SoulProp with your key file
  2. We decrypt and verify your original file
  3. Download your evidence package

The evidence package includes your original file, the timestamp token, a PDF certificate, and verification scripts anyone can run.

Who uses this

Creators protecting original work before sharing with collaborators

Developers timestamping algorithms and code before open-sourcing

Inventors documenting prior art before patent filings

Businesses proving when contracts and deliverables existed

Ready to seal?

$13 per seal. No account needed. Buy as many as you need.

Seal a file