Hanko stamp with anti-fraud mechanism

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In Japan, contracts are signed using a hanko, an engraved stamp. (I bought one for the name "Mark" just for fun when I was in Japan. We also bought one for my daughter's karate teacher and he loves it, and now uses it on the certificates his gives his sudents. You can order a hanko online.)

Japan Sugoi writes that Mitsubishi Pencil has announced a hanko with built-in fraud protection:

Non Japanese people usually sign legal contracts or other important documents in ink, but Japanese traditionally prefer an engraved stamp called a hanko. One concern though, is that the stamped signature, usually the owner’s name, can be easily forged. Mitsubishi Pencil’s Security Enhanced Personalized Hanko stamp ダイヤルバンク印 alleviates the risk of fraud by adding a two-digit dial that creates a series of marks around the printed name, making it difficult for an unauthorized person to copy someone’s stamp. It also wards against theft by requiring a code to be entered before use.

I'm not sure how people can tell whether or not a correct combination was used, though. perhaps a Japanese reader can explain.

Mitsubishi Security Enhanced Personalized Hanko Stamp