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Segment reporting (Details)
 12 Months Ended
Jun. 30, 2025
USD ($)
segment
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment 1      
Total revenues $ 39,495 $ 2,888,482   $ 6,261,091
Cost of revenues   (3,833,684)   (10,826,620)
GROSS PROFIT (LOSS) 39,495 (945,202)   (4,565,529)
Total operating expenses (3,031,188) (13,890,591)   (23,739,111)
LOSS FROM OPERATIONS (2,991,693) (14,835,793)   (28,304,640)
Other (expenses) income, net (1,378,213) (3,449,165)   88,288
NET LOSS $ (4,369,906) (18,284,958) $ (28,216,352) $ (28,216,352)
Single reporting segment        
Segment Reporting Information [Line Items]        
Number of reportable segments | segment 1      
Total revenues $ 39,495 2,888,482 6,261,091  
Cost of revenues   (3,833,684) (10,826,620)  
GROSS PROFIT (LOSS) 39,495 (945,202) (4,565,529)  
Salaries and benefits expenses (403,217) (1,312,018) (1,350,704)  
Professional services expenses (2,551,438) (2,356,726) (758,005)  
Impairment losses   (8,869,066) (17,483,368)  
Recovery of (provision for) credit losses 51,632 (1,131,988) (3,273,860)  
Other operating expenses (128,165) (220,793) (873,174)  
Total operating expenses (3,031,188) (13,890,591) (23,739,111)  
LOSS FROM OPERATIONS (2,991,693) (14,835,793) (28,304,640)  
Other (expenses) income, net (1,378,213) (3,449,165) 88,288  
NET LOSS $ (4,369,906) $ (18,284,958) $ (28,216,352)