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Prepayments and other assets (Details) - Nonrelated Party - USD ($) | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Prepaid Expenses and Other Assets [Line Items] |  |
Prepayments | $ 2,308,298 | $ 1,927,401
Others | 1,439,414 | 1,300,858
Total prepayments and other current assets | $ 3,747,712 | $ 3,228,259

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