The invention relates to a system which includes: a plurality of batteries (B1, B2) connected in parallel by a pair of first (1.sup.+) and second (1.sup.) power conductor, each battery being connected to a device (BMS1, BMS2) for managing the battery; a device (EMS) for global energy management; a generator (101) suitable for applying an alternating signal to the power conductors (1.sup.+, 1.sup.); and a plurality of transmitter-receiver circuits (M) respectively connected to the various management devices (EMS, BMS1, BMS2), each transmitter-receiver circuit (M) being connected to the power conductor (1.sup.+, 1.sup.) and being suitable, in order to transmit data, for switching the impedance thereof between the power conductors (1.sup.+, 1.sup.) between two states, and, in order to receive data to detect whether a value representing the amplitude of the alternating signal on said power conductors (1.sup.+, 1.sup.) is higher or lower than a threshold.

Methods, Systems, and Computer program products can use grid telemetry to generate a fingerprint. One of these methods includes generating a first grid telemetry fingerprint based on characteristics of an electrical grid. The method also includes verifying a transaction based on the first grid telemetry fingerprint and a second grid telemetry fingerprint associated with the transaction.

Methods, Systems, and Computer program products can use grid telemetry to generate a fingerprint. One of these methods includes generating a first grid telemetry fingerprint based on characteristics of an electrical grid. The method also includes verifying a transaction based on the first grid telemetry fingerprint and a second grid telemetry fingerprint associated with the transaction.