Proof of existence

Prove it existed.At a precise moment in time.

Protect your ideas, creations, documents and digital evidence with independently verifiable proof of existence.

UNFTProof creates a cryptographic fingerprint of your file and anchors it to UNFTChain, establishing verifiable evidence that the exact content existed at that moment.

Your file stays yours. Your proof stays on-chain.

Certify a file Verify a certificate

Why it matters

Some things are worth proving.

An idea before you share it. A design before you present it. A manuscript before you send it.

An invention while you develop it. A photograph before publication. The condition of a property today. A document before a dispute begins.

Sometimes what matters most is being able to prove: “This already existed.”

Practical evidence

What can you protect?

Ideas & creative work

Designs, photography, manuscripts, music, concepts and drafts — evidence of what you created and when it existed.

Inventions & projects

Technical drawings, prototypes, specifications, research and development notes. It does not replace a patent.

Architecture & construction

Plans, site photographs, reports, inspections, project progress and records of property conditions.

Digital evidence

Photographs, videos, exported conversations, agreements, notices and other records in their exact digital state.

Software & development

Source archives, releases, datasets, specifications and milestones — tied to an exact version.

Business documents

Contracts, proposals, reports, commercial offers and internal documents without publishing their contents.

Remote contract signing

Professional

Your clients don't need to come to you.

Send contracts. Collect signatures. Work from anywhere.

Manage contract signing remotely without unnecessary meetings, paperwork or travel. Send the document, follow every signer through completion and keep permanent evidence of every completed signature.

Every completed signature is independently timestamped on-chain, creating verifiable evidence of who signed, what was signed and when.

  • No unnecessary client visits
  • Manage signatures from anywhere
  • Verifiable on-chain evidence

Before disclosure

Don't share it until they're bound to protect it.

Protect your work behind a signed NDA.

Send the NDA first. Release the files after.

UNFTProof cryptographically binds your NDA to the confidential material you want to disclose. Your recipient reviews and signs the agreement before the protected files are released.

The completed signing evidence is independently timestamped on-chain, creating a verifiable record linking the agreement, the protected material and the signature.

  • Protected files stay locked until the NDA is signed.
  • The agreement is cryptographically bound to the disclosed material.
  • Signing evidence is timestamped on-chain.

Privacy by design

Your files stay private. Your proof lives on-chain.

For certification, your original file never leaves your device. Its SHA-256 fingerprint is calculated locally in your browser, and only the cryptographic proof is sent to UNFTProof and anchored on-chain.

For workflows that require temporary file delivery, such as Remote Signing and NDA Protected Delivery, files are encrypted by default. For maximum privacy, you can also encrypt them locally with your own password before upload — a password UNFTProof never receives or stores.

Local certification

Your original never leaves your device.

Double-layer option

Protect sensitive deliveries with your own client-side encryption, on top of UNFTProof storage encryption.

On-chain evidence

Only cryptographic evidence is anchored publicly — never your original content.

We don't need your file to prove it existed.

Create your proof

Certify a file

Calculate its fingerprint locally, review the proof data and anchor it to UNFTChain when you are ready.

Stored privately with your account to help identify this proof. It may also appear in the watermarked preview, but never in receipts, final certificates or blockchain data.

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Drop a document here

or browse from your device

It never leaves your device.

From file to proof

Four clear steps

  1. 1

    Submit

    Select your file. Its cryptographic fingerprint is calculated locally, and certification produces an initial submission receipt.

  2. 2

    Anchor

    The proof data is broadcast to UNFTChain and anchored in the blockchain. The original file is not included.

  3. 3

    Confirm

    After the required blockchain confirmations, the definitive certificate becomes available.

  4. 4

    Verify

    Anyone can compare the certificate, original file and live blockchain record independently.

Built for more than copyright

For every moment when prior existence matters.

UNFTProof is for any situation where demonstrating that specific digital information existed at a specific moment could matter.

  • Creators
  • Writers
  • Designers
  • Photographers
  • Architects
  • Engineers
  • Inventors
  • Developers
  • Researchers
  • Companies
  • Professionals
  • Individuals

Not a promise. A proof.

A record anyone can check again.

Files can be edited. Dates can be changed. Databases can be modified. A cryptographic proof anchored to a blockchain creates an independently verifiable record.

Verify the fileVerify the hashVerify the chain

Prove it now

Proof is easier before a dispute begins.

Establish a verifiable record now, while the exact original file is in your hands.

Certify your file Verify proof