Notarial deposit or blockchain timestamping: which proof of priority should you choose?
Depositing a document with a notary and timestamping it on a blockchain both answer the same need (dating a document), but with very different strengths, costs, and uses. An honest comparison to choose according to your situation.
You need to prove that a document existed on a certain date. Two instincts compete: visit a notary (a reassuring, solemn gesture) or timestamp the file in seconds via the blockchain. Both date a document, but they do not play in the same league, whether in legal weight, cost, or use.
This comparison sets out the facts, without caricaturing one or overselling the other. The goal: to help you pick the tool that fits the real stakes of your document.
Two different logics
A notarial deposit rests on the involvement of a public officer. The notary receives a document, may deposit it among their records (minutes), and draws up a deed. That deed is an authentic instrument: national civil law attaches to it a particular evidentiary weight and an enforceable certain date. In France, this framework flows from the Civil Code (Articles 1369 et seq.).
A blockchain timestamp is a technical process. You compute the cryptographic fingerprint (SHA-256 hash) of a file, anchor it to a public chain such as Bitcoin, and obtain a receipt proving that fingerprint existed on a given date. No public officer, no human judgement: a cryptographic mechanism anyone can verify.
The first logic rests on trust in a person vested with a public mission. The second rests on trust in a process that is decentralised and verifiable. That difference in nature explains almost everything else.
What each solution actually proves
Dating a document does not prove everything. You must separate: existence (the file existed in this form on this date), integrity (it has not been altered since), priority (it predates another date), and ownership (who holds the rights). Neither the notary nor timestamping proves, on its own, that you are the author or the rights holder.
The notarial deposit provides a certain date with high evidentiary weight: challenging an authentic instrument requires a heavy procedure. The notary can also keep the document and attest to its content on the date of deposit.
Blockchain timestamping provides proof of existence and integrity of a fingerprint on a given date. It is non-qualified under eIDAS: its reliability is assessed case by case by the court. Article 41(1) of the eIDAS regulation, however, prohibits denying it legal effect solely because it is not qualified.
In both cases, proof of authorship or ownership of rights is built through a body of evidence (source files, correspondence, contracts), not through the act of dating alone.
The comparison, point by point
| Criterion | Notarial deposit | Blockchain timestamping |
|---|---|---|
| Nature | Authentic instrument by a public officer | Automated technical process |
| Certain date | Yes, enforceable | Proof of existence, assessed by the court |
| Evidentiary weight | High (authentic instrument) | Element of a body of evidence |
| Delay | Days to several weeks | Seconds |
| Unit cost | Tens to hundreds of euros | A few cents to a few euros |
| Suitable volume | Low (one-off deeds) | Very high (every version) |
| Confidentiality | The document is disclosed to the notary | The file stays on your machine (only the hash is sent) |
| Safekeeping | Handled by the notary's office | Receipt kept by the user, independently verifiable |
| Enforceable force | Possible depending on the deed | None |
When the notary remains essential
There are situations where timestamping is not enough, and only the notary will do. That is the case whenever a deed requires authenticity or a certain date that is very hard to challenge:
- property sale, gift, authentic will,
- certain high-stakes agreements and commitments,
- deeds for which the law imposes the notarial form.
In these cases, the value of an authentic instrument (its evidentiary weight, its certain date, the public officer's liability, sometimes its enforceable force) has no technical equivalent. The cost and delay are the price of reinforced legal certainty.
Blockchain timestamping never confers the status of an authentic instrument and does not replace a notary where the law or the stakes require one. Presenting it as a substitute for the notarial profession would be misleading. The two tools coexist: each has its own ground.
When timestamping is the right tool
Conversely, a notarial deposit is disproportionate for dating numerous, routine files with modest individual stakes. A creator producing dozens of deliverables a month will not visit a notary for every version.
Timestamping shines precisely there:
- successive versions of a creation (mockups, illustrations, photos, code, manuscripts),
- client deliverables, commercial proposals, decks,
- drafts, work logs, batches of files,
- any document that simply needs to be frozen in time, without turning it into a solemn deed.
It documents the priority and integrity of each version, at a cost and pace compatible with daily use.
The two together, often
The question "notary or blockchain?" is sometimes framed badly. The two can combine: timestamp all working versions continuously to build a dense chronology, and reserve the notarial deposit for the few documents whose stakes justify an authentic instrument. Lightweight dating feeds the everyday; the notarised deed secures the peaks.
Where does LegalStamp fit in?
LegalStamp covers the need for everyday dating: timestamping your files without worrying about unit cost. The SHA-256 hash is computed locally in your browser (the file never leaves your machine), then anchored to the Bitcoin blockchain via OpenTimestamps. You get an independently verifiable receipt, even if LegalStamp were to disappear.
It is not a notarial service and does not claim to be: LegalStamp is non-qualified timestamping, built for volume, speed, and confidentiality. For deeds that require authenticity, the notary keeps their full place; for everything else, timestamping avoids tying up time and money.
To freeze every version of your creations and deliverables without blowing your budget, compare LegalStamp plans by your volume. See the pricing →
Conclusion
The notarial deposit and blockchain timestamping are not opposites: they occupy two different levels of proof. The notary brings authenticity and a certain date, at a cost and delay that reserve it for high-stakes documents. Timestamping brings fast, confidential, and affordable proof of existence, suited to volume.
The right instinct is not to pick a side, but to match the tool to the document's stakes. Date everything that needs it by timestamping; reserve the notary for the deeds that truly require one.
FAQ
Disclaimer: this article is provided for informational and educational purposes. It does not constitute legal advice. For a high-stakes deed or an evidence strategy in a dispute, consult a notary or a lawyer depending on your situation.
