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Summary of principal accounting policies (Tables)
12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of Straight-line Method Over Estimated Useful Lives

 

Electronic and mining equipment 3-6 years
Furniture and fixtures 3-6 years
Leasehold improvements Shorter of estimated useful life or term of lease
Vehicles 3 years
Summary on exchange Rates Applied

The exchange rates applied are as follows:

Balance sheet items, except for equity accounts   December 31,
2022
    December 31,
2021
 
RMB:USD     6.8979       6.3559  
HKD:USD     7.799       7.7992  

 

Items in the statements of operations and comprehensive loss, and statements cash flows:

 

   December 31,
2022
   December 31,
2021
 
RMB:USD   6.8979    6.4525 
HKD:USD   7.7959    7.7727