Abstract: At least one embodiment of the present invention relates to a method for ensuring authenticity of an electronic transaction performed during a transaction session. The method includes receiving, over a first network, a request from a user for the completion of an electronic transaction; receiving, over the first network, an authentication code from the user which has been provided to the user over a second network separated from the first network, thereby authenticating the user, completing the electronic transaction; and storing information associated with the electronic transaction and the transaction session. The method further includes generating a one-way hash value based on information comprised in the electronic transaction and information associated with the transaction session, and providing the one-way hash value to the user, wherein the one-way hash value is usable for ensuring the authenticity of the electronic transaction.