| Schedule of intangible assets |
| | | | | | | | | | | | | Computer | | | | | | | Goodwill | | software | | Trademark | | Total | | | US$ | | US$ | | US$ | | US$ | Cost: | | | | | | | | | Balance at July 1, 2023 and June 30, 2024 | | 16,735,211 | | 3,645,232 | | 1,393 | | 20,381,836 | Additions | | — | | 75,600 | | — | | 75,600 | Balance at December 31, 2024 | | 16,735,211 | | 3,720,832 | | 1,393 | | 20,457,436 | | | | | | | | | | Accumulated amortization | | | | | | | | | Balance at July 1, 2023 | | — | | 2,939,968 | | 662 | | 2,940,630 | Amortization | | — | | 457,317 | | 139 | | 457,456 | Balance at June 30, 2024 | | — | | 3,397,285 | | 801 | | 3,398,086 | Amortization | | — | | 164,229 | | 70 | | 164,299 | Balance at December 31, 2024 | | — | | 3,561,514 | | 871 | | 3,562,385 | | | | | | | | | | Carrying amount | | | | | | | | | Balance at June 30, 2024 | | 16,735,211 | | 247,947 | | 592 | | 16,983,750 | Balance at December 31, 2024 | | 16,735,211 | | 159,318 | | 522 | | 16,895,051 |
|