Entropy of the universe

hurk4

In our observable universe it is observed that entropy develops from low to high. At the same time specialness goes from high to low. (see Penrose's road to reality). Apparently it is possible if we consider our observable universe as part of a blackhole that blackholes have no constant entropy. Maybe our universe develops from a whitehole to a blackhole with one or many singularities. Is it thinkable that in a multiverse a concentratation of radiation can occur reversing entropy from high to low leading to white holes (bigbang's) ?