Seal any document with patent-filed, IANA-registered verification technology. Built for audit and legal evidence workflows. A forged copy cannot pass verification.
Scan · lock · seal — tamper-evident in seconds.
See it in action
Watch a document become tamper-evident — sealed, signed, and anchored, so anyone can verify it without trusting us.
Muted by default · click for sound
The trust model, inverted
Most "secure" documents ask you to trust a vendor, a portal, or a login. A .pvf carries its own proof. The evidence travels with the file — anyone, anywhere, can verify it offline, against a public key, forever.
One file holds the document, its cryptographic fingerprint, the signatures, and the verification logic. No server call required to prove it.
HMAC-SHA256 for content integrity, Ed25519 for sender identity. Alter a single byte and verification fails — the seal freezes red.
Each document's fingerprint is anchored on the Polygon blockchain — an independent timestamp no one, including us, can rewrite.
How the proof works
The crypto, made legible. When a .pvf is opened, the verifier recomputes the proof from scratch and compares it against what's sealed inside. No trust required — only math.
The verifier recomputes the document's SHA-256 hash and compares it to the one sealed at signing time. Identical means untouched.
The Ed25519 signature is checked against the issuer's published public key. Proves who sealed it — and that the hash wasn't swapped.
The fingerprint is looked up on Polygon. A confirmed anchor proves the document existed, unchanged, at that block's timestamp.
The .pvf container itself — an IANA-registered format — is validated end to end, so the verification logic can't be quietly stripped out.
Trust signals · all independently checkable
Real cryptography, a registered standard, and a public key. These aren't badges — they're verifiable facts.
A novel verification architecture, filed at the Israel Patent Office.
PATENT PENDINGapplication/vnd.vertifile.pvf is an officially recognized media type.
REGISTEREDDocument fingerprints are anchored on Polygon mainnet — publicly auditable.
ON-CHAINThe public key is published. Verify any .pvf against it — no account, no API.
NO TRUST NEEDEDBlind mode · zero-knowledge
In Blind mode, the fingerprint is computed on your side. Your content is encrypted end to end before it ever leaves the device. We hold the proof — never the document.
Pricing
Same cryptography in every tier. You're paying for scale and branding — never for the right to verify.
Verifying a .pvf is always free — anyone, forever.