Where is the headquarters of HashKey Group?

Excuse me, could you please clarify for me the location of the headquarters of HashKey Group? I'm trying to gather information on their operations and I'm unable to find a definitive answer on their website or through other sources. I'm particularly interested in knowing the city and country where their main office is situated. Could you perhaps provide me with the exact address or at least the region they are based in? Thank you in advance for your assistance.