Pricing
Start free. Upgrade if you need more proofs.
- 5 proofs per month
- SHA-256 content hashing
- Ed25519 digital signatures
- QR code verification
- Shareable proof links
- 500 proofs per month
- Files up to 50MB
- Proof chains (link proofs together)
- Priority email support
- Download proof bundles
- Unlimited proofs
- Files up to 100MB
- API access (coming soon)
- Bulk operations
- Dedicated support
FAQ
SHA-256 for content hashing and Ed25519 for digital signatures. Both are widely-used, well-audited algorithms. SHA-256 is used in Bitcoin; Ed25519 is used in Signal, SSH, and many secure systems.
Your data never leaves your browser. All hashing and signing happens locally. We don't store your messages, files, or proofs on any server. The proof itself is self-contained.
Your proofs continue to work. They're mathematically verifiable without any server. Save your proof JSON file and you can verify it forever using the standard algorithms.
STAMPEDSAFE provides cryptographic integrity proofs, not legal notarization. Proofs may be useful as supporting evidence, but consult a lawyer for legal matters. We make no legal claims.