BlackRock's Bitcoin ETF quickly hitting $20 billion is a big deal. Here's why:

1. Bitcoin Goes Mainstream: Big companies like BlackRock are getting into Bitcoin, making it more legit.

2. Investor Interest: Lots of people want to invest in Bitcoin, but through a safe and easy way like an ETF.

3. Market Boost: The ETF buying lots of Bitcoin can push its price up.

4. Regulation: Getting a Bitcoin ETF approved means the government is okay with it, which is good for the future of crypto.

5. Easy Access: It's a simple way for regular folks to add Bitcoin to their investments without dealing with the technical stuff.