A couple links to an Aleksey Gubarev, same name as XBT CEO:
ALEKRIANN LIMITED
offshoreleaks.icij.org/nodes/23404
Andersen Business Services, Inc. Frunzenskaya Nab., 40 Moscow, 119270 Russia
XBT started around the same time as the entities above.
offshoreleaks.icij.org/nodes/297603