  We present Tracer Tokens, a hardware token of privacy-preserving contact
tracing utilizing Exposure Notification \cite{GAEN} protocol. Through
subnetworks, we show that any disease spread by proximity can be traced such as
seasonal flu, cold, regional strains of COVID-19, or Tuberculosis. Further, we
show this protocol to notify $n^n$ users in parallel, providing a speed of
information unmatched by current contact tracing methods.
