Comcentra Logs

What a tamper-evident evidence record must deliver: five test questions.

Not every record is the same. Whether a document holds up in a dispute can be checked with five questions. If one of them fails, it ends up as one word against another again.

Basics · evidential weight

As of November 2026 · Reading time approx. 4 minutes

A signed PDF with twelve photos looks like solid evidence. On closer inspection, questions arise: When were the pictures taken? On which vehicle? Who confirmed the condition? Has anything been changed since? And can someone who trusts neither the provider nor either party verify it? The following five test questions help to assess any record.

Five questions, one result.

The five questions

When? Where and on which vehicle? Who confirmed it? Unchanged since then? Verifiable without the provider? An evidence record that answers all five questions is tamper-evident and independently verifiable. One that leaves any of them open is a claim with pictures.

1. When was the condition recorded?

The point in time decides between before and after. A time that can be typed in on a computer proves nothing. What holds up is a timestamp assigned when the photo is taken that cannot be changed afterwards. It becomes even stronger if the record's seal is also anchored in a public register that nobody can backdate.

2. Where and on which vehicle?

A photo must be clearly assigned to one vehicle: via the VIN, the number plate and the place where it was taken. Pictures from the gallery that were taken somewhere at some time fail here. Recording should therefore only be possible directly from the camera, bound to the device and the location.

3. Who confirmed the condition?

A record created by one party alone is a claim. Only the signature of both participants, the person handing over and the person taking over, turns it into a joint finding. The signature belongs to the sealed content, not on a loose page next to it.

4. Has the document remained unchanged since then?

Any document can be edited on a computer unless something prevents it. A seal prevents it: a digital fingerprint of the entire content, every photo, every mark, every signature. If a single character changes, the fingerprint no longer matches. If a vehicle's records are also chained together, a missing record is noticed as well.

5. Can a third party verify it without trusting the provider?

The last question is the one most often forgotten. An evidence record that only the provider can confirm depends on that provider. A public verification page is better: scan the QR code, compare the fingerprint, check the anchoring in the public register. Without an account, without software, even years later.

What this means in practice

For fleets and lessors: return damage must be proven item by item, with photo, description and time reference. The five questions are the checklist for this.

For dealerships and workshops: the condition at check-in and check-out is the protection against the accusation that damage occurred on the premises.

For logistics and delivery providers: every handover in the chain needs its own sealed condition, otherwise liability sticks at the point where the documentation ends.

For customers and drivers: a tamper-evident evidence record also protects the person taking over the vehicle from claims for damage that was already there.

Frequently asked questions

Isn't a qualified electronic signature enough?

It answers the question of who signed. It does not answer the questions about the time and origin of the photos. The two complement each other but do not replace each other.

Does an assessor have to understand the technology?

No. The verification page shows the result in plain words: genuine, unchanged, anchored at the stated time. The technology behind it is disclosed but does not have to be understood.

Note

How a court assesses evidence is decided case by case. The five questions describe what a document should bring to the table.