The feasible paths for integrating cryptocurrency reserves into the monetary systems of various countries may include: Firstly, countries can gradually recognize the legal status of cryptocurrencies and formulate clear regulatory frameworks. Secondly, central banks could set up special funds to gradually hold some mainstream cryptocurrencies. Thirdly, promote the application of cryptocurrencies in cross-border trade and payments to increase their acceptance. Finally, enhance international cooperation and coordination to jointly explore the integration of cryptocurrencies into the global monetary system.

International cooperation is key in exploring cryptocurrency integration. Clear regulations and central bank involvement are crucial steps towards mainstream acceptance. Let's watch how this unfolds globally!