Blockchain traceability and document certification in Corsica
Blockchain traceability means recording the fingerprint of a document, or the stages in a product's life, on a shared ledger that cannot be quietly altered, together with their date. From Bastia, we design proof-of-authenticity solutions that anyone can check. The content of your documents is never exposed.
How a blockchain authenticates a document
Everything rests on the digital fingerprint, also called a hash. It is a short string of characters calculated from a file. The same file always gives the same fingerprint, and the slightest change, a single comma moved, produces a completely different one. In practice, the file cannot be rebuilt from its fingerprint.
Authenticating a document means recording this fingerprint on a blockchain. The entry is timestamped, and after that it cannot change. Later, anyone can recalculate the fingerprint of the document they are shown and compare it with the recorded one. If they match, the document is exactly the one that existed on that date.
For a product, the same mechanism applies to each stage of its life (harvest, processing, inspection, shipping). Each authorised participant records their stage. Put end to end, the stages form a history anyone can consult.
Proof of authenticity, when a blockchain helps
- 01
Proving a document existed on a given date
A creative work, a report, a plan or a handover record whose precedence and integrity you want to be able to demonstrate.
- 02
Letting third parties check for themselves
An employer, a customer or a public authority needs to check a diploma or an attestation without contacting you.
- 03
Sharing a history between several parties
From the producer to the retailer, by way of the processor or the carrier, everyone feeds the same history without any one of them controlling it.
- 04
Fighting forged documents
Attestations, diplomas or labels that are easy to copy, and whose authenticity has to be quick to check.
Blockchain traceability, examples by sector
- 01
Local produce and food
Tracing a product's origin, its processing stages, its inspections. Consumers see them by scanning a QR code on the label.
- 02
Training providers and schools
Issuing diplomas and attestations whose authenticity can be checked online. A document issued in error can be revoked.
- 03
Local authorities and public bodies
Timestamping decisions, regulations or published documents, to prove their date and that they have not been altered.
- 04
Construction and property
Freezing the state of a report, a survey or a handover record on a given date.
- 05
Creators and young companies
Building proof of precedence for a work, a design or source code.
The stages of a traceability project
We run these projects from Haute-Corse, for businesses and organisations on the island as well as elsewhere. The same person follows you from the first conversation to launch.
- 01
Understand
Which documents or which products? Which participants, and who will check, and how? We map out the whole route, from issue through to verification.
- 02
Design
Choice of network and of what gets recorded, each participant's rights. We also design how verification will work, a web page or a QR code for example.
- 03
Build and test
A registration smart contract, connected to your software to automate entries, and a verification page. Everything is tested, then the contract is audited.
- 04
Launch and support
Go-live, onboarding for your team, close follow-up of the first entries.
What you get, and what happens next
- 01
A registration service
The smart contract, plus the module that calculates and records fingerprints from your tools. Automatically, or in one click.
- 02
A verification page
Open to everyone, it lets people check a document or product with no account and no technical skills.
- 03
An open verification method
Documented in full, it lets anyone repeat the check with public tools, without depending on us.
- 04
Documentation
How it works, admin procedures, key storage.
- 05
Ongoing support
Once live, we can handle maintenance and keep an eye on network fees. The service changes as your needs do.
What to check before launching a traceability solution
- 01
A blockchain does not check the truth
It proves that information has not changed since it was recorded, not that it was accurate. Everything depends on the checks made beforehand by authorised people.
- 02
Personal data
Nothing personal is recorded on-chain. Only fingerprints go there, in keeping with GDPR principles.
- 03
Keeping the originals
A fingerprint cannot bring back a lost document. Keep the originals, unchanged, or there will be nothing to verify.
- 04
Legal value
A blockchain timestamp is strong technical evidence. On its own, it does not replace a qualified timestamp under the EU eIDAS regulation where the law requires one. Your legal adviser can guide you.
- 05
Longevity of the network
Choose a network that can reasonably be expected to stay accessible for as long as your proofs need to last.
What drives the cost of a blockchain traceability project
Every project receives a clear quote after an initial conversation. These are the main factors.
- 01
Volume of entries
The number of documents or stages to record. And whether they can be grouped together to keep network fees down.
- 02
Number of participants
Each authorised participant needs rights and access, sometimes an interface of their own.
- 03
Integration
Connection to your management, production or student records software.
- 04
Verification experience
A simple web page, a QR code on labels or a mobile app.
- 05
Choice of network
Public or private, with different running costs.
Technologies and methods
- Digital fingerprints (hash)
- Timestamping
- Solidity
- EVM
- QR codes
- API
Frequently asked questions
Is the content of my documents visible on the blockchain?
No. Only the fingerprint is recorded, and the document cannot be rebuilt from it. The document itself stays with you.
How does someone verify a document?
They upload the file to the verification page, or scan the QR code. The fingerprint is recalculated and compared with the recorded one, and the result appears straight away, with no account to create.
What happens if a diploma was issued in error?
The system can allow for revocation. The original entry stays where it is, but a new entry states that the document is no longer valid, and the verification page shows this clearly.
Can documents still be verified without KALLISTACK?
Yes, that is deliberate in the design. On a public blockchain, entries remain accessible for as long as the network runs. The documented verification method lets anyone check them with public tools.
Do we need a blockchain to timestamp documents?
No. Conventional timestamping services exist and are sometimes enough, particularly when a qualified timestamp is required. A blockchain becomes worthwhile when several parties must verify without a trusted intermediary, or when the proof must stay independent of any single provider.