Patent ID: 6851607

Claim:
A method for monitoring transfers of value units between a plurality of gambling cards (CJ, CJ 1 , CJ 2 , CJn) and a plurality of gambling machines ( 200 , 200 ′, 200 ″, 200 ′″, 300 , 300 ′, 300 ″), each machine being connected to a transcriber ( 210 ) of data onto a gambling card (CJ 2 ), the machines being connected in a secured network with a central processing unit ( 1 ) by link means ( 123 ), the method having the following steps, during a gambling operation: reading data stored in a gambling card, particularly an identification number (Id) of the card (CJ 1 ) and data (S, Op 1 , Op 2 , Opx) representing the value units debited and credited initially and during the preceding gambling operations, the method being characterized by the following steps: electronically securing and exchanging data between the machine ( 200 ) and a database (BD) of the central processing unit ( 1 ) by means ( 123 ) linking the secured network, particularly data representing the balance (S) of the value units and the identification number (Id) of the card; and updating data in parallel in both the card and the database of the central processing unit at least twice during each use of the card in a gambling playing session and then checking that the data stored in the gambling card (CJ 1 ) correspond to the data in the database (BD) in order to monitor the integrity of a system constituted by such a card, such a machine, the network, and the central processing unit.