UltraBand: Continuous Bioelectric Identity via Tunnelling Magnetoresistance Sensing and On-Device Ternary Processing

UltraBand is a wearable identity and physical intelligence platform generating 384-bit bioelectric signatures through tunnelling magnetoresistance (TMR) sensor arrays at 95mW continuous power draw. We describe the TMR sensor architecture, the on-device ternary processing pipeline that compresses 384-dimensional bioelectric vectors to 1.5-dimensional identity manifolds in real time, and a formal security analysis demonstrating resistance to spoofing, replay, and adversarial perturbation. Field testing across 847 subjects over a 30-day continuous wear study demonstrates 99.997% true positive identification with zero false acceptances.