How can Zhang Heqing leverage digital currencies to diversify his investment portfolio?

As an investor, Zhang Heqing is interested in diversifying his investment portfolio using digital currencies. How can he effectively leverage digital currencies to achieve this goal? What strategies can he employ to minimize risks and maximize returns? How can he identify promising digital currencies to invest in? What are the potential benefits and drawbacks of including digital currencies in his investment portfolio? How can he manage the volatility and fluctuations commonly associated with digital currencies? What are the tax implications of investing in digital currencies? How can he ensure the security of his digital assets? How can he stay updated with the latest trends and developments in the digital currency market?