Document integrity & digital fingerprint
Free tool: compute the digital fingerprint (SHA-256) of a consignment note or document in your browser and detect tampering – including a mini hash-chain demo. Everything local, nothing is uploaded. The honest principle behind tamper-evident documents.
A document takes effect — from now on it must not change unnoticed.
Fingerprint of a document
Paste the content of a consignment note or document, or upload a file — the SHA-256 fingerprint is computed locally in your browser . The file does not leave your device.
Why a chain? — mini demo
Every block contains the fingerprint of the preceding block. Change one character in an early block — and all following fingerprints no longer match: the chain breaks visibly. That is exactly what makes a blockchain tamper-evident.
What the fingerprint does in logistics
A consignment note, a handover photo, a temperature log: once a document takes effect, it must not change unnoticed. That is exactly what the fingerprint records – without storing the original anywhere. A few places where this matters in day-to-day work:
Consignment note & e-CMR
At handover, the fingerprint of the consignment note is saved. If a different quantity or weight later shows up, the fingerprint differs: the change is documented, not merely claimed.
Seal & handover photo
Handling photos and the seal number get a fingerprint. Anyone swapping an image afterwards destroys the fingerprint – the proof at the terminal stays verifiable.
Cold chain & log
The temperature log is sealed at closing. A later correction of individual readings stands out immediately instead of quietly disappearing into the report.
Proof of delivery (POD)
Signature and delivery time are recorded. The fingerprint proves the record has stayed unchanged since delivery – helpful for complaints and recourse.
Audit-proof chain via ERP/TMS
If the fingerprints are chained one after another, an audit trail emerges that no one can rewrite retroactively. This chain across several parties is available as a Pro and Premium service on request.
Document, figure and route together
The fingerprint secures the document, the CO₂e calculator delivers the verifiable emission, route optimization the short distance. Together: verifiable records instead of claims.
What a fingerprint can do — and what it can't
A Hash (here SHA-256, the standard under NIST FIPS 180-4) is a digital fingerprint: from any amount of data, 64 hex characters always result. A single changed bit produces a completely different hash (avalanche effect) — and the content cannot be computed back from the hash.
This is how manipulation is detected: If the fingerprint no longer matches later, the document was altered. A Chain (ledger/blockchain) stores these fingerprints in such a way that an earlier entry cannot be rewritten unnoticed.
What a hash does NOT do: It proves no authorship and no authenticity — only that nothing has changed since the fingerprint. Whoever wants to prove who needs digital signatures (PKI); whoever wants to keep the fingerprints tamper-evident jointly needs a distributed ledger. This tool only computes the fingerprint — locally, without a network, and writes nothing into a blockchain.
Where that limit hurts: if someone acts under a stolen identity, the document is genuine and unaltered — the fingerprint confirms exactly that and still does not help.
Fits together with CMR digitisation: first turn the document into structured data with AI, then secure it with the fingerprint. The audit-proof chain over ERP/TMS is available as a Pro/Premium service on request.