How OriginProof compares
Eight services. Same comparison table you'd see on any competitor's site — with our own product graded by the same honest criteria as everyone else, including where we still have work to do.
| OriginProof | ProofStamper | OriginStamp | Bernstein | OpenTimestamps | FreeTSA | e-Soleau (INPI) | Email-to-self | |
|---|---|---|---|---|---|---|---|---|
| Technology | Bitcoin + RFC 3161 + Ed25519 | RFC 3161 only | Blockchain (Bitcoin + Ethereum) | Blockchain + qualified TSA | Blockchain (Bitcoin) | RFC 3161 | SHA-256 + INPI archive | None |
| Price | Free (10/mo) · $19.99/mo Pro (100 seals) | Free · Pro $9/mo | Enterprise (hidden) | From ~$9/project | Free (open source) | Free | ~$16 / 5 years | Free |
| Speed | ~30 sec · Bitcoin in ~1 hr | ~30 sec | Up to 24 hr (batched) | ~10 min | 1–4 hr | ~30 sec | Minutes | Instant |
| File privacy | Zero-knowledge (browser Web Crypto) | Zero-knowledge (browser-side) | Zero-knowledge (hash only) | File stored on server | Zero-knowledge (hash only) | Zero-knowledge (hash only) | INPI stores a copy | N/A |
| Owner name in the Bitcoin hash | ✓ Legal name hashed in | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| File format | Any | Any | Any | Any | Any (technical) | Any (technical) | PDF only | Any |
| Account required | Yes | No | Yes | Yes | No | No | Yes | No |
| Legal recognition | Bitcoin + RFC 3161 (FreeTSA) | eIDAS Art. 41 (via FreeTSA) | Blockchain (varies) | Blockchain + qualified TSA | Blockchain (varies) | eIDAS Art. 41 | France only | Very weak |
| Independent verification | ✓ Public URL + .ots + PDF recipe | ✓ OpenSSL | ✓ Blockchain explorer | ✓ Blockchain + TSA | ✓ Blockchain explorer | ✓ OpenSSL | Via INPI only | ✗ |
| Branded PDF certificate | ✓ Pro tier | ✗ | ✗ | Limited | ✗ | ✗ | ✗ | ✗ |
| Best for | Creators · freelancers · devs | Quick daily timestamps | Enterprises, compliance | Startups, IP portfolios | Devs, privacy maximalists | Devs, technical users | French creators | Not recommended |
| Honest weaknesses | FreeTSA (not qualified) · newer brand · ~1 hr Bitcoin latency | FreeTSA · no Bitcoin | Not instant · vague claims | Per-project · stores files | CLI only · slow | CLI only | France · PDF only · paid | No cryptographic proof |
Pricing and features are based on publicly available information as of 2026. Tools evolve — verify on each official website. OriginProof is our product; we've included it honestly, graded under the same criteria as every competitor, including weaknesses we're still working on (the FreeTSA caveat in particular).
Four things only OriginProof has
Not because we built more features — because we made different architectural choices.
Owner name in the Bitcoin hash
Your legal name is hashed into the value that's anchored on Bitcoin. Ownership isn't a database record — it's part of the immutable proof. No one else in this lineup does this.
Three proof layers under $20/mo
Ed25519 signature + RFC 3161 timestamp authority + Bitcoin anchor — stacked. Most services pick one. Bernstein has all three, but charges per project and stores your file on their server.
NKA-namespaced protocol
Every hash begins with the prefix NKATechnologies|OriginProof|v1| — the same tagged-hash discipline Bitcoin's own BIP340/Taproot uses. Cryptographically attributable to this protocol.
Distributable PDF certificate
NKA-branded multi-page certificate with a step-by-step independent verification recipe a third party can follow with OpenSSL + the OpenTimestamps CLI. Not just a screenshot.
Try it on what matters
10 free seals a month — 20 your first month. No credit card. Same stack the comparison shows.
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