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Score a signature against everything that signer has signed before

DWDiane WhitakerLogistics Compliance Manager ·

We take delivery notes signed on paper, scan them, and file them. Last month two of them came back with a signature that looked wrong to the person who has filed them for nine years — close enough to pass a glance, different enough to stop them. They were right, and the only reason we know that is that they happened to remember the earlier ones.

That is not a control. It is one person's memory, and it does not scale to 4,000 documents.

What we actually need

  • A reference set per signer, built from the documents we already hold.
  • Upload a document, and get a similarity score for its signature against that signer's earlier ones — a number, with the closest matches ranked.
  • The reference beside the result, so we can see what the number is comparing.

We are not asking for a verdict. If a document scores far below everything else that person has signed, we want it flagged and looked at by a human. That is the whole job.

Why it matters

A forged delivery note is a delivered load nobody delivered. We find out weeks later, in a reconciliation, when the goods and the paperwork disagree and the person whose name is on the note says it was not them. By then the argument is about who remembers what.

Catching it at the point of filing turns a dispute into a question.

What we do today

Nothing systematic. Suspicious documents get pulled by hand, and someone opens three or four older files next to them on two monitors to compare. It happens when a person is paying attention, which is not every day, and never on the documents nobody had a reason to doubt.

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DW

Diane Whitaker, Logistics Compliance Manager ·
Numbers, so you know the shape of it: about 4,000 signed delivery notes in the archive, 60 people who sign them, some with two hundred documents behind them and some with four. We would rather see a score we can argue with than a verdict we have to take on trust.

IN

Incapon ·
This is the public half of the call on the 13th. One week, timeboxed, ending on the 20th: index the archive per signer, score a new document against every signature we hold for that person, and return the ranked matches with the score next to each one. What it will not do is tell a court anything — it tells you which two documents to put in front of a human first.

DW

Diane Whitaker, Logistics Compliance Manager ·
Ran the first batch this morning. The two we already suspected came back well below everything else by that person, which is the answer we were hoping not to get. One ask: show the reference signature next to the one being scored, so the number and the image are on the same screen.

IN

Incapon ·
Completed, one week from the call. It is live in your workspace with the reference thumbnail beside each match, and it goes into Signature Verification for everyone from today. Two limits worth knowing: three reference signatures per signer before a score means much, and a scan below 300 dpi loses the pressure detail the ensemble reads.

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