Reuters 1 minute read A representation of cryptocurrency Bitcoin is seen in this illustration taken August 6, 2021. REUTERS/Dado Ruvic/Illustration A representation of cryptocurrency Bitcoin is seen in this illustration taken August 6, 2021. REUTERS/Dado Ruvic/Illustration Sept 22 (Reuters) - The United Arab Emirates' Securities and Commodities Authority has signed an agreement with the Dubai World Trade Centre Authority (DWTCA) aimed at supporting the trading of crypto assets in DWTCA's free zone, state news agency (WAM) reported on Wednesday.