The U.S. has finally approved a bitcoin ETF. So what next?

The U.S. Securities and Exchange Commission has approved the long-awaited bitcoin exchange-traded fund. Investors are now turning their attention to whether an ether ETF might be next, even as SEC Chair Gary Gensler warns that bitcoin remains a “speculative” asset. CNBC’s Arjun Kharpal looks at what’s next for cryptocurrencies.