As a well-known trading platform, Nasdaq's proposal to include cryptocurrencies such as XRP, SOL, ADA, and XLM in its crypto benchmark index signifies that these altcoins are moving toward the mainstream financial sector, potentially attracting more attention from traditional investors. If approved by the U.S. Securities and Exchange Commission, the Hashdex ETF could invest in these cryptocurrencies, further increasing their liquidity and market depth, lowering investment thresholds, and enhancing accessibility. Regarding portfolio strategy, if approved, it may be worth considering an appropriate allocation of these altcoins to achieve diversified returns, but attention must be paid to their high volatility and regulatory uncertainty.