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 (< 2 GB for browser hashing). Files are never uploaded in Private or Verify mode.
Private 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
Coming Soon
Professional
Subscription with proof credits
€199/month
• 50 proof credits included
• Additional credits at €2 each
• Priority processing
• API access
Frequently Asked Questions
Ready to Create Your First Proof?
Join researchers, legal professionals, and businesses who trust ProofSeal for their digital certificates.