The invention relates to a method for verifying the identity of a user who is carrying out a transaction, based on a combination of biometric parameters, in particular fingerprint detection, defined as a biometric PIN, comprising the provision of a biometric device that permits the reading of the digital fingerprint, and a sequential combination of fingerprints previously registered in a registration process, wherein the user can use said combination of fingers or digital fingerprints on the device for authentication, by means of the following steps: accessing an application previously installed on the device, wherein the biometric reader is activated; placing each finger or fingerprint previously selected in the registration process on the device in a selected sequential combination, wherein each finger should have a positive correspondence or match to continue with the next finger; once the fingers forming the PIN have been placed in the correct order and with a positive match for each finger, the identity verification data (date and time, unique serial number and GPS position) of the user is encrypted, if the identification is positive; and authorizing the transaction or action.