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The uncertainty region of the highly energetic neutrino IceCube200107Aincludes 3HSP J095507.9+355101 ($z$~=~0.557), an extreme blazar, which wasdetected in a high, very hard, and variable X-ray state shortly after theneutrino arrival. Following a detailed multi-wavelength investigation, weconfirm that the source is a genuine BL Lac, contrary to TXS 0506+056, thefirst source so far associated with IceCube neutrinos, which is a"masquerading" BL Lac. As in the case of TXS0506+056, 3HSP J095507.9+355101 isalso way off the so-called "blazar sequence". We consider 3HSP J095507.9+355101a possible counterpart to the IceCube neutrino. Finally, we discuss sometheoretical implications in terms of neutrino production.

3HSP J095507.9+355101: a flaring extreme blazar coincident in space and time with IceCube-200107A