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Related party balances and transactions (Details) - USD ($)

6 Months Ended

Jun. 30, 2023

Dec. 31, 2022

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Total

$ 136,437

$ 3,530,844

Bank Of Beijing [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Maturities

March 2023

Collateral/Guarantee

^[1]

Guarantee by Beijing SMEs Credit Re-guarantee Co., Ltd

Total

2,899,728

Bank Of Beijing [Member] | Minimum [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Interest rate

4.80%

Bank Of Beijing [Member] | Maximum [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Interest rate

5.00%

B O C Fullerton Bank [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Maturities

February 2024

Interest rate

8.50%

Collateral/Guarantee

^[2]

***

Total

$ 67,484

121,634

China Merchants Bank [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Maturities

March 2023

Interest rate

4.30%

Collateral/Guarantee

^[3]

Guarantee by Beijing Zhong Guan Chun Technology Finance Guarantee Co.

Total

434,959

China Construction Bank [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Maturities

August 2023

Interest rate

4.10%

Collateral/Guarantee

^[4]

****

Total

$ 68,953

$ 74,523

[1]	Beijing SMEs Credit Re-guarantee Co., Ltd is a financial services company and provides credit re-guarantee business and short-term capital operation to small and medium enterprises. In addition, Qing Tang, the spouse of Yimin Wu, the Company’s Chairman of the Board of Directors and Chief Executive Officer, has provided real estate property as collateral of approximately $3.1 million (RMB 20,000,000) with Beijing SMEs Credit Re-guarantee Co., Ltd to secure the guarantee with Bank of Beijing.
[2]	Yimin Wu and Qing Tang provided personal guarantees for the loan during the contract period.
[3]	Beijing Zhong Guan Chun Technology Finance Guarantee Co., Ltd is a financial services company and provides credit guarantee business and short-term capital operation to small business. Yimin Wu also provided a personal guarantee for the loan during the contract period.
[4]	Qi Gu was the co-borrower for the loan during the contract period.

X

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 808
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