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  2. Check verification service - Wikipedia

    en.wikipedia.org/wiki/Check_verification_service

    Check verification services can use a number of different methods or may combine a number to verify the validity of a check. Negative check database [ edit ] A negative check database contains a comprehensive list of people who either wrote a bad check at a retail location, paid a bill with a check that was returned, [3] also called " bouncing ...

  3. Verification and validation - Wikipedia

    en.wikipedia.org/wiki/Verification_and_validation

    Verification is intended to check that a product, service, or system meets a set of design specifications. In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results. In the post ...

  4. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    Luhn algorithm. The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in U.S. Patent No. 2,950,048, granted on August 23, 1960.

  5. ChexSystems - Wikipedia

    en.wikipedia.org/wiki/ChexSystems

    Woodbury, Minnesota. , United States. Parent. FIS. Website. chexsystems .com. ChexSystems is an American check verification service and consumer reporting agency owned by the eFunds subsidiary of Fidelity National Information Services. It provides information about the use of deposit accounts by consumers.

  6. Check weigher - Wikipedia

    en.wikipedia.org/wiki/Check_weigher

    Checkweigher. A checkweigher is an automatic or manual machine for checking the weight of packaged commodities. It is normally found at the offgoing end of a production process and is used to ensure that the weight of a pack of the commodity is within specified limits. Any packs that are outside the tolerance are taken out of line automatically ...

  7. Checksum - Wikipedia

    en.wikipedia.org/wiki/Checksum

    Checksum. A checksum is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage. By themselves, checksums are often used to verify data integrity but are not relied upon to verify data authenticity. [1]

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