EX Rock s.r.o., . All rights reserved. EX Rock s.r.o., a company duly incorporated and existing under the laws of the Czech Republic, with its registration number 193 14 850, having its registered office at Roháčova 145/14, Žižkov, 130 00 Praha 3, Czech Republic. EX Rock s.r.o. is registered in the Commercial Register maintained by the Municipal Court of Prague as the virtual asset services provider.