Blockchain Timestamp vs Notary
People often reach for a notary when they want to "make it official" that they had an idea. It helps to know exactly what a notary certifies — and what a blockchain timestamp certifies instead — because they barely overlap.
Not legal advice. This page is general information from a software company, not from a law firm. Examples are mostly from US law; rules differ by country. If the stakes are real, talk to a qualified IP attorney.
What a notary actually certifies
In the United States a notary public is an impartial witness to the signing of documents. The notary checks the signer's identity, watches the signature or takes the signer's acknowledgment, and records the act. The notary does not read your business plan to see whether it is original, and does not certify that anything in it is true. California makes this explicit: every notarial certificate must carry a notice that the notary verifies only the identity of the individual who signed, and not the truthfulness, accuracy or validity of the document.[16]
So a notarised description of your idea proves one thing well: that you, identified by ID, signed a document on that date. Whether the pages presented years later are the same pages is a question of how well the original was kept — staples, initials on every page, the notary's journal entry.
Fees are usually small. Many US states cap them by law; in California the maximum is $15 per signature.[16] Civil-law notaries in other countries have a wider role and higher fees.
What a blockchain timestamp certifies
A timestamp does the opposite job. It says nothing about who you are, and everything about what existed. A SHA-256 hash is a fingerprint of the exact bytes of your content; change a comma and the fingerprint changes completely. Writing that fingerprint into a Bitcoin transaction fixes it in a public record that no one can edit afterwards. Years later, anyone can take your original file, compute the hash, and see that it matches the transaction. The time is as precise as Bitcoin allows — block timestamps are accurate to within an hour or two.[24]
Two properties matter in practice. First, the check is independent: it does not rely on a person's memory, a paper journal or the survival of any office — including ours. Second, it is private: nobody sees your document, not even a notary. Only the hash is published.
Side by side
| Notary (US) | Blockchain timestamp (icalledit) | |
|---|---|---|
| Proves identity of a signer | Yes | No |
| Proves exact content, bit for bit | Only indirectly, via the preserved paper original | Yes |
| Proves truth or originality of the content | No[16] | No |
| Works for digital files (code, audio, designs) | Awkward — needs a printout or a declaration | Yes, any file type |
| Who sees the content | The notary may see it | Nobody |
| Cost | Often capped by state law, e.g. $15 per signature in California[16]; plus travel and time | $19 one-time |
| Availability | Office hours, appointment | Any time, online |
| Verification later | Through the notary's records and the intact original | By anyone, on any block explorer |
| Familiar to courts | Very | Increasingly, but treatment varies |
How the law sees each
Notarial acts are an old and universally recognised institution; a judge will not ask what a notary stamp is. Blockchain timestamps are newer. In the EU, the eIDAS Regulation provides that an electronic timestamp cannot be denied legal effect and admissibility solely because it is electronic, but only qualified electronic timestamps — issued by supervised trust service providers — enjoy a legal presumption that the date and time are accurate. A Bitcoin timestamp is not a qualified timestamp.[22] Some US states have legislated specifically: Vermont treats a blockchain record as self-authenticating when accompanied by a proper declaration, and is careful to add that this presumption does not extend to the truthfulness of the record's contents.[21]
In practice a timestamp may need a short explanation to be understood, while a notary stamp does not. On content integrity, though, the timestamp is the stronger of the two.
Which should you use?
- Use a notary when a law, a bank, a court or a counter-party requires a notarised signature; when identity is the thing in doubt; for affidavits and sworn declarations.
- Use a timestamp when the content is what matters: drafts, designs, source code, recordings, research data, the deck you are about to send. Also when you need it now, from anywhere, without showing the document to anyone.
- Use both for high-stakes matters: timestamp the files, then sign a short declaration that lists their hashes and have that declaration notarised. The notary ties the evidence to you; the blockchain ties it to the content.
Neither one gives you ownership of an idea or any exclusive right. For that, see the full comparison of patents, copyright registration and NDAs.
Quick answers
Is a blockchain timestamp a notarisation?
No. Nobody checks your identity and nobody witnesses a signature. It is a technical proof that certain content existed at a time, not an official act.
Need dated evidence today?
One registration is $19, one-time. You get a Bitcoin transaction, a PDF certificate and a proof.json you can verify without us.
Timestamp your idea → See pricing← Back to the full comparison of all methods
Sources
Official and primary sources for the facts on this page. All accessed on 20 September 2026. Fees and processing times change — check the source before you rely on a number.
- California Secretary of State — Notary Public Handbook (a notary verifies only the identity of the signer; maximum fee $15 per signature, Gov. Code § 8211) — https://notary.cdn.sos.ca.gov/forms/notary-handbook-current.pdf
- Vermont 12 V.S.A. § 1913 — blockchain records; the presumption does not extend to the truthfulness of the contents — https://codes.findlaw.com/vt/title-12-court-procedure/vt-st-tit-12-sect-1913/
- Regulation (EU) No 910/2014 (eIDAS), Article 41 — legal effect of electronic time stamps; presumption only for qualified time stamps — https://eur-lex.europa.eu/eli/reg/2014/910/oj
- Bitcoin Wiki — Block timestamp (accurate only to within an hour or two) — https://en.bitcoin.it/wiki/Block_timestamp