### Possible Answer

Check Digit Systems ... This formaula is known by many names: the "Luhn Formula", "The IBM Check", "Mod 10", ... ISO 7064 Mod 97,10. - read more

After some research, I think I'll go with the ISO 7064 Mod 97,10 formula. It seems pretty solid as it is used to validate IBAN (International Bank Account Number). - read more

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