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Share-based payment (Tables)
12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of share based payment arrangements

 

Type of arrangement  Grant date 

Quantity

granted

(shares)

  

Fair value

per unit

  

Contract

period

 

Vesting

conditions

Bonus shares  August 28,2020   720,000   US$1.02    5 years   5 years’ service
Schedule of share based payment transactions

  

Year ended

December 31, 2025

  

Year ended

December 31, 2024

  

Year ended

December 31, 2023

 
Share-based payment  $87,808   $131,712   $131,712