Cryptocurrency is going mainstream. Last week, fintech giants PayPal announced it will allow its 346 million users to buy and spend bitcoin and a handful of other major cryptocurrencies. Other well-established financial companies such as JPMorgan Chase and Coinbase are jumping into the crypto field as well. Alex Mashinsky, CEO of Celsius Network, explains why PayPal taking on cryptocurrencies is so significant and what we could expect to see with cryptocurrencies going forward.