An appliance with a keyboard, or a touch screen, equipped with sensors that can recognize each of the user’s fingerprints. The system includes a device for capturing the buyer’s digital signature, and a recording device for capturing the actions and responses of the second party before the second party authorizes that the digital signature be associated with each document. By doing so, the read time of the bit lines is reduced and the signal amount is increased. A biolayer is mounted on the piezoelectric material and is associated with the finger electrode segment, and a fluidic chamber is associated with the biolayer.