The United Nations Conference on Trade and Development released three policy briefs exploring the risks and costs of private digital currencies and urging authorities to take action to curb the expansion of cryptocurrencies in developing countries, including: 1. By regulating cryptocurrency exchanges , digital wallets and decentralized finance, prohibiting regulated financial institutions from holding cryptocurrencies (including stablecoins) or providing related products to customers, ensuring comprehensive financial supervision of cryptocurrencies. 2. Restrict advertisements related to cryptocurrencies, and other high-risk financial assets. 3. Provide a safe, secure and affordable public payment system adapted to the digital age. 4. Agree and implement global tax harmonization regarding the tax treatment, regulation and information sharing of cryptocurrencies. 5. Redesign capital controls to take into account the decentralized, borderless and anonymous features of cryptocurrencies.