OpenSig
AES compliant signing & IP protection

Stamp verifiable proof on every original and every agreement

OpenSig gives creators, entrepreneurs and teams digital signatures and timestamped proofs for files of any kind — no account, no uploads, no complex workflows.

See the product

Protect IP. Sign contracts. Share verifiable proof that lives forever.

Why creators and teams choose OpenSig

Think of OpenSig as your digital pen with a built-in notary. You keep your files, your style of working and gain proof-positive receipts every time it matters.

Protect originals on repeat

Timestamp versions of your work the moment inspiration hits, no matter the file type.

  • On-device timestamping in seconds
  • Unlimited revisions showing clear provenance
  • Shareable certificates for clients and collaborators

Sign anything with confidence

Create AES-compliant signatures for every contract, approval, or handoff without forcing new workflows.

  • Works with PDFs, media files, design assets, code, zip files and more
  • Capture signer intent, context and timestamp in one receipt
  • Portable proofs your partners can verify independently

Own your record forever

Keep control of your identity and proofs across tools, clients and collaborators.

  • Open standards with no vendor lock-in
  • Email-based recovery plus upcoming hardware & SSO options
  • Credit-based pricing that scales with your volume
3 min to create your first proof
0 uploads needed to protect your work
100% verifiable by clients & fans

The two ways people rely on OpenSig

Whether you are protecting your next drop or signing a deadline-driven deal, OpenSig delivers lasting proof with the same flow.

Protect original work

Lock in authorship for every file you release, share, or pitch.

  • Content creators, artists and designers stamping every version
  • Entrepreneurs documenting product roadmaps, pitch decks and investor updates
  • Journalists timestamping research, drafts, photographs and interview notes

Sign & approve anything

Add your e-signature to any document or file — simply and quickly.

  • Vendors and customers exchanging signed contracts
  • Freelancers and studios confirming deliverables and approvals
  • Startups and teams signing policies, agreements, handovers and releases

Who is already exploring OpenSig

We're co-designing OpenSig with a diverse early access cohort to make sure it works for solo creators and scaling teams alike.

Content creators & artists

Stamp portfolio updates, music drops and campaign concepts before they ship.

Startups & SMEs

Replace scattered signing tools with a single verifiable receipt per lifecycle milestone.

Studios & agencies

Prove ownership of creative work and lock in approvals with clients worldwide.

Journalists & researchers

Preserve source material, drafts and data integrity before stories break.

How OpenSig works

  1. Verify your email. OpenSig generates your standalone, verified digital identity and links your device.
  2. Open your file. Your device calculates your file's unique digital fingerprint — no uploads, ever.
  3. Establish your intent. Add purpose or copyright to contextualize your signature.
  4. Sign your file. Your digital identity publishes the signature proof to a permanent public record.
  5. Share with confidence. Anyone holding the file can decrypt the proof and confirm authenticity instantly — forever.

Product preview

Take a look at the MVP workflows we're refining with early adopters—from lightning-fast IP receipts to multi-signer approvals.

Create signing receipt Manage agreements Verify loading Verify proof Annotate PDFs with OpenSig Credit management
Proof receipt example Timestamped certificate

Trust, security and independence

OpenSig is engineered for long-term proof value, so your records stay verifiable long after projects end or tools change.

🛠️ Explore the OpenSig repositories

OpenSig gives us a single source of truth for our originals and our deals. We can prove when something was created and who signed off—without changing how we work.

— Creative studio & early access partner

FAQ

How are files handled?
Files never leave your device. OpenSig works from a cryptographic fingerprint of each file, not from uploads or shared copies.

What proof do stakeholders receive?
Every signing action or timestamp produces a shareable certificate that includes signer identity, intent and a verifiable record reference. Anyone with the original file can confirm authenticity instantly.

Is my data secure?
Yes - completely. OpenSig is designed around privacy-first principles. Your files never leave your device and your proofs reveal nothing about their contents. The only data published outside your device is a short, encrypted proof receipt — not the file itself, nor any of your personal information.

Can I export or move my proofs?
Yes. OpenSig follows open formats and standards, so your records remain portable and verifiable even outside our platform.

What is the public record?
OpenSig anchors proofs to a public, tamper-proof blockchain ledger — Polygon, a layer 2 blockchain built on Ethereum — that anyone can verify independently. No personal data is stored on the ledger—only cryptographic fingerprints of your files signed by your digital identity.

No account — really?
Yes, really. OpenSig does not require an account to use. With OpenSig, you sign documents directly from your device using your private digital identity. The only personal information needed is your email for identity verification and recovery.

What does early access include?
Access to the beta app, guided onboarding, tailored playbooks for IP protection and signing and early pricing aligned with your team's usage pattern.

Ready to put proof behind your next release or agreement?

Tell us what you're protecting or signing and we'll tailor a walkthrough around your files, collaborators and timeline.