| Schedule of cash, cash equivalents and restricted cash |
| | June 30, 2026 | | | December 31, 2025 | | | | | | | | | U.S. | | | | | | | Insured cash | | $ | 403,613 | | | $ | 909,229 | | Uninsured cash | | | 301,787 | | | | 1,898,809 | | | | | 705,400 | | | | 2,808,038 | | China | | | | | | | | | Insured cash | | | 233,420 | | | | 309,048 | | Uninsured cash | | | 1,500,411 | | | | 5,129,727 | | | | | 1,733,831 | | | | 5,438,775 | | Total cash and cash equivalents and restricted cash | | | 2,439,231 | | | | 8,246,813 | | Less: Cash and cash equivalents | | | 2,158,233 | | | | 7,966,797 | | Restricted cash | | $ | 280,998 | | | $ | 280,016 | |
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