  We address the physical origin of the ultrarelativistic prompt emission (UPE)
phase of GRB 190114C observed in the interval 1.9-3.99 s, by the Fermi-GBM in
10 keV-10 MeV . Thanks to high S/N ratio of Fermi-GBM data, a time resolved
spectral analysis has evidenced a sequence of similar blackbody plus cutoff
power-law spectra, on ever decreasing time intervals during the entire UPE
phase. We assume that during the UPE phase, the inner engine of the GRB,
composed of a Kerr black hole and a uniform test magnetic field B0, aligned
with the BH rotation axis, operates in an overcritical field. We infer an
$e^+e^-$ pair electromagnetic plasma in presence of a baryon load, a PEMB
pulse, originating from a vacuum polarization quantum process in the inner
engine. This initially optically thick plasma self-accelerates, giving rise at
the transparency radius to the MeV radiation observed by Ferm-GBM. At trf >
3.99 s, the electric field becomes undercritical, and the inner engine operates
in the classical electrodynamics regime and generate the GeV emission. During
both the quantum and the classical electrodynamics processes, we determine the
time varying mass and spin of the Kerr BH in the inner engine, fulfilling the
Christodoulou-Hawking-Ruffini mass-energy formula. For the first time, we
quantitatively show how the inner engine, by extracting the rotational energy
of the Kerr BH, produces a series of PEMB pulses. We follow the quantum vacuum
polarization process in sequences with decreasing time bins. We compute the
Lorentz factors, the baryon loads and the radii at transparency, as well as the
value of the magnetic field, assumed to be constant in each sequence. The
fundamental hierarchical structure, linking the quantum electrodynamics regime
to the classical electrodynamics regime, is characterized by the emission of
blackholic quanta with a timescale $t=10^{-9}$s, and energy $E=10^{45}$ erg.
