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Cost of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]    
Electricity $ 75,938 $ 29,822
Employee benefits 3,474 1,524
Other direct expenses 1,261 513
Total cost of revenue 80,673 31,859
Bitcoin mining    
Disaggregation of Revenue [Line Items]    
Electricity 75,829 29,784
Employee benefits 3,014 1,374
Other direct expenses 1,102 469
Total cost of revenue 79,945 31,627
AI Cloud Services    
Disaggregation of Revenue [Line Items]    
Electricity 109 38
Employee benefits 460 150
Other direct expenses 159 44
Total cost of revenue $ 728 $ 232