Patent ID: 7739499

Claim:
A method for check anti-fraud security comprising: identifying sheets of check base stock with unique base identifiers that are each invisible code results of an algorithm, wherein each base identifier uniquely identifies a corresponding check-sized portion of base stock, respectively; receiving a plurality of identified sheets at a printing device; printing transit or routing number, account number and sequential check number in at least magnetic ink character recognition (MICR) line format on each of a plurality of received sheets to form blank checks; at least one of imaging, scanning or reading said base identifier and said MICR line from each of said blank checks; generating a unique blank check identification tag responsive to said base identifier and said MICR line for each of said blank checks; storing the unique blank check identification tag in a database; and providing a validation signal in accordance with the database when a completed check corresponding to a unique blank check identification tag from the database is issued to a recipient or presented for payment.