Abstract: A system and method that keeps check of financial transactions by maintaining distinct records for a plurality of devices associated with a financial account, in conjunction with performing authentication further to inputting transaction data from a point of sale, the system comprising a communication portion that inputs transaction data received from the point of sale, the transaction data including an account number and one of a CVV number and an expiration date; a device identification portion that identifies a particular device, from which the transaction originated, out of the plurality of devices based on the account number and one of the CVV number and the expiration date; and an authentication portion that performs authentication processing based on a comparison process that utilizes the transaction data, the authentication portion generating an authentication result, and the authentication portion outputting the authentication result.