Permanent proof. Sealed on Bitcoin.

Protect text, files, or ideas with a permanent timestamp on the world’s most secure blockchain.
Private by default, always independently verifiable.

No account neededIndependently verifiable

Get started

Drop a file here, or click to choose (≤ 10 MB). Your file is hashed locally in the browser.

PrivatePublicPrivate by default

How It Works

1. Choose & Hash

Select a file or paste text. We create a fingerprint locally.

2. Seal & Pay

One click, one-time payment, lifetime record.

3. Share & Verify

Download your certificate and verify anytime with public tools - even without ProofSeal.

Why ProofSeal

Plain-language certificate

Step-by-step verification instructions, designed for legal and compliance workflows.

Independent verification

Check proofs with public explorers or your own node - no platform lock-in.

Private by default

Content stays on your device. Only the fingerprint is published.

Permanent timestamp

Each submission is its own Bitcoin transaction - no batching.

Simple, Transparent Pricing

Individual Proof

Pay per proof, no subscription or account required

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Includes Bitcoin transaction fees and permanent anchoring

Coming Soon

Professional

Subscription with proof credits

€199/month

• 50 proof credits included

• Additional credits at €2 each

• Priority processing

• API access

Ready to Create Your First Proof?

Join researchers, legal professionals, and businesses who trust ProofSeal for their digital certificates.