A method and device for visual code transaction verification enables more secure electronic transactions. The system architecture supports a three-phase secure communication protocol. The transition monitoring window monitors the patterns entering the LFSR, incrementing a counter if a transition is detected. The receiver unit compares the new received TPMS signals to the classified signals to identify whether the ID code indicates that the position of the tire has changed. A core-node controller receives requests for bitrate allocations from source nodes and assigns each request to one of the master controllers of the core node.