Tom Lee is known as one of Wall Street’s biggest bitcoin optimists.
As the cryptocurrency hovered around $3,500 in September 2017, he predicted that bitcoin would be "your best investment until the end of the year." That was three months before bitcoin rocketed above $19,000.
The Fundstrat Global Advisors co-founder has stood by his bullish calls on the digital currency even as bitcoin fell more than 60 percent from its highs to below $6,000 in June. And now bitcoin is rallying. The digital currency crossed $8,300 on Tuesday, according to the Coinbase exchange.