  Blazars are among the most powerful steady sources in the Universe.
Multi-messenger searches for blazars have traditionally focused on their
gamma-ray emission, which can be produced simultaneously with neutrinos in
photohadronic interactions. However, X-ray data can be equally vital to
constrain the SED of these sources, since the hadronically co-produced
gamma-rays could get absorbed by the ambient photon fields and cascade down to
X-ray energies before escaping. In this work, we present the outline for an
untriggered, time-dependent analysis of neutrino flares from the direction of
X-ray selected blazars using 10 years of IceCube data. A binomial test will be
performed on the population to reveal if a subcategory of sources has
statistically significant emission. The sources are selected from RomaBZCat,
and the p-values and best-fit flare parameters are obtained for each source
using the method of unbinned likelihood maximisation.
