The new spot Bitcoin (BTC -0.25%) ETFs are arguably one of the most important product launches on Wall Street in the past 30 years. In less than three months, they have already attracted nearly $30 billion from investors, and daily inflows on some days have been more than$1 billion. Over the short term, these new spot Bitcoin ETFs will help to popularize the idea of cryptocurrency as a stand- alone asset class that deserves a place in your portfolio. Over the longer term, they could serve as the gateway to ...