BlackRock, the world’s largest asset manager, is reportedly working on an XRP ETF filing and two key dates to watch are May 1 and June 9.BlackRock's silence on XRP could be attributed to its focus on Bitcoin and Ethereum, in which it has achieved significant success.BlackRock may be waiting for leverage to strike and taking a cautious approach with XRP, considering regulatory concerns and its lower market share.A possible launch of an XRP ETF, even without BlackRock's involvement, has the potential to trigger a price surge for XRP to $15.