Traditional notaries prove a document exists. But in 2026, most content is AI-generated. The question isn't "does this exist?" — it's "what does this mean and why was it created?" AmiStampAI answers that with cryptographic proof.
No account required. Works in browser. Takes 30 seconds.
A real AmiStampAI certificate contains everything needed for independent verification.
Every AmiStampAI seal binds three dimensions that no other notary captures together.
The document exists and has not been altered. SHA-256 hash, ECDSA signature.
What the author declares this document means. Recorded, signed, immutable.
Why it was created. The declared purpose, cryptographically bound to the content.
Traditional notarization vs. AmiStampAI.
| Capability | Traditional | Blockchain-only | AmiStampAI |
|---|---|---|---|
| Proves existence | Yes | Yes | Yes |
| Proves authorship | Yes | Yes (if signed) | Yes (cryptographically bound) |
| Certifies meaning | No | No | Yes |
| Certifies intention | No | No | Yes |
| Immutable record | No | Yes | Yes |
| Verifiable by anyone | No | Yes | Yes |
| Speed | Days to weeks | Seconds | Local: <5s · Chain: <30s |
Four steps. No intermediary. Your keys, your stamp.
ECDSA P-256 key pair generated in your browser via Web Crypto API. Private key never leaves your device.
Write your content, its meaning, and your intention. All three are bundled and signed with your private key.
The stamp hash (document + meaning + intention + your key) is recorded on Tezos. Immutable, public, verifiable.
Anyone with the public key can verify the signature. Anyone can check the blockchain proof. Zero trust required.
No custom algorithms. No proprietary formats. Standards only.
Industry-standard elliptic curve signatures. Web Crypto API
Cryptographic hashing for document integrity. SubtleCrypto.digest()
Energy-efficient proof-of-stake chain. shadownet / mainnet
Auth + PostgreSQL + RLS. Open-source, EU hosting. supabase-js
Export and share public keys for external verification. Standard JWK format.
Every domain where proving intention matters as much as proving existence.
Stamp your research, code, or invention with its declared purpose before publication. Provable prior art with declared intention.
Example scenario
"I stamped my ML algorithm with intention 'novel approach to federated learning' 6 months before publication. When a competitor claimed similar work, my timestamp proved prior art."
Contracts, NDAs, consent forms — stamp not just the text, but what each party intends by signing.
Example scenario
"Both parties stamped the contract with their intentions. When dispute arose, the stamped intentions clarified ambiguous clauses."
When AI creates something, stamp the human intention behind the prompt. EU AI Act transparency, built in.
Example scenario
"I stamp every AI-generated report with my editorial intention. If audited under the EU AI Act, I have cryptographic proof of human oversight."
Certify the meaning and purpose of your research before peer review. Timestamp + intention = stronger claim.
Example scenario
"I timestamped my thesis abstract with declared research intention before submission. The blockchain proof established priority independent of the journal."
Generate a real cryptographic stamp in your browser. Nothing leaves your device.
Your signing key on this device: …
Save the proof next to your document: it carries the document's name and the verification link. Keep them together: a proof separated from its document loses its value. Anyone can verify it on this page, without an account.
Your stamping history. Local stamps sync to cloud when signed in.
Check the signature, the document and the blockchain anchor of any stamp.
Start free. Pay only when you need blockchain anchoring or volume.
No account required · Works in browser · Takes 30 seconds
Your signing key lives in this browser. If you clear site data or switch devices, a new key is created. Your existing stamps remain verifiable: each proof file carries its public key.
Under 5 seconds for local stamping. Blockchain anchoring (Pro tier) takes 30-60 seconds depending on network congestion.
Yes. Stamp the human intention behind the prompt. This provides EU AI Act transparency and proves human oversight.
Yes. All cryptographic operations run in your browser. We never see your content, only the hash you choose to anchor.
Your stamps are on the Tezos blockchain and verifiable with standard cryptographic tools. You don't depend on us to verify.
They are starting to. On 20 March 2025 the Marseille judicial court in France (RG 23/00046, AZ Factory v. Valeria Moda) accepted timestamps anchored in a public blockchain, together with bailiff reports and online publication, as evidence of when fashion designs were created and who owns their copyright. It is a first-instance decision, weighed with other evidence, and other courts may decide differently. An AmiStampAI proof gives you the same kind of public anchor, plus your declared meaning and intention. Keep the proof file next to the original and ask a lawyer how to use it in your case.
All cryptographic operations run in your browser. Private keys never leave your device. We store only what you explicitly choose to persist, with full deletion rights.
AmiStampAI is a cryptographic tool, not an AI decision system. When used to stamp AI-generated content, it provides the transparency and traceability the Act requires.
ECDSA P-256, SHA-256, JWK, Tezos — all open, auditable, interoperable. No vendor lock-in. Export your keys and verify anywhere.