  I suggest an extension of the SM by introducing a dark sector with the local
$U(1)_{D}$ symmetry. The particles in the dark sector bring about the new
physics beyond the SM. In particular the global $B-L$ symmetry is violated just
above the electroweak scale, this becomes a common origin of the tiny neutrino
mass, the cold dark mater and the baryon asymmetry. The model can not only
account for the tiny neutrino mass and the "WIMP Miracle", but also achieve the
leptogenesis around the electroweak scale. Finally, it is very possible that
the model predictions are tested in near future experiments.
