  We explore the possibility that the electroweak phase transition happens at a
scale much higher than the electroweak scale today. In this context, high scale
CP-violating sources for electroweak baryogenesis are not constrained by
low-energy experiments. We propose a scenario of high-scale electroweak
baryogenesis linked to flavour physics. This scenario allows for a period of
enhanced Yukawa couplings during the evolution of the universe, which source
time-dependent CP violation. The electroweak symmetry is never restored after
the high-scale phase transition due to negative contributions to the Higgs
thermal mass squared from a large number of additional electroweak-scale
neutral scalars coupling to the Higgs. As a result, the washout of the baryon
asymmetry is avoided.
