Bitcoin has now entered the mainstream.

With the launch of the world's first bitcoin futures exchange-traded fund (ETF), the world's leading cryptocurrency has seen a nice surge, recently surpassing an all-time high of nearly $65,000.

However, there may still be plenty of room to run.

According to top Wall Street strategist Thomas Lee, co-founder of Fundstrat Global Advisors, the price of bitcoin could reach $168,000 by year's end, a nearly 170 percent increase.

What is the reason?

Lee estimates that the new bitcoin ETF could attract a whopping $50 billion in initial coin offerings during its first year, acting as a key short-term driver of the token's price.

"We believe that Bitcoin demand will outstrip QQQ inflows," Lee wrote earlier this week in a note to investors.

He is referring to the Invesco QQQ Trust Series 1 ETF, which tracks the Nasdaq 100 Index and is currently the fifth-largest exchange-traded fund (ETF) in the United States.

If Lee is correct, the cryptocurrency bull market is still in its infancy.

Thus, here's how you can get a piece of the action — even if you only have a small amount of spare change to begin with.

ProShares Bitcoin Strategy Exchange-Traded Fund (BITO)

This is the ETF that is garnering all of the attention.

The ProShares Bitcoin Strategy ETF does not directly invest in bitcoin. Rather than that, the fund invests in bitcoin futures contracts on the Chicago Mercantile Exchange.

BITO launched on Oct. 19 with a $20 million seed round. By day's end, it had gained 4.8 percent and amassed over $570 million in assets.

On Wednesday, the price of bitcoin surpassed $65,000 for the first time, while BITO gained another 3%.

Investing in ETFs is as straightforward as purchasing a stock. They are traded on major stock exchanges and fluctuate in price throughout the day.

However, you can also invest directly in Bitcoin. Nowadays, certain investing apps allow you to purchase cryptocurrencies and exchange-traded funds (ETFs) commission-free.

Bitcoin investments

If you're not interested in direct exposure, consider investing in companies that have a significant exposure to the cryptocurrency market.

Tesla, for example, according to CEO Elon Musk's Twitter account, owns close to 42,000 bitcoins. Tesla stock tends to move in lockstep with bitcoin.

PayPal is another cryptocurrency to consider. The company launched a service in October that allowed users to buy, sell, and hold cryptocurrencies in the United States. It launched a similar product in the United Kingdom in late August.

And then there's Coinbase, which operates the country's largest cryptocurrency exchange. At the end of Q2, it had 8.8 million retail monthly transacting users.

To be sure, these are not inexpensive stocks. Tesla is currently trading at around $866, PayPal is trading at $255, and Coinbase is trading at over $300, owing to the recent rally in cryptocurrencies.

However, you can participate in these bitcoin plays by using a popular stock trading app that allows you to purchase fractions of shares with any amount of money.

Purchase bitcoins directly

While there is considerable excitement surrounding the launch of new bitcoin exchange-traded funds, don't overlook the simplest way to invest in cryptocurrencies: directly purchasing the tokens.

Things are volatile in the cryptocurrency world, but bulls like Lee believe that bitcoin's supply and demand have reached a new equilibrium in the range of $168,000.

Many cryptocurrency exchanges now charge up to 4% in commission fees just to buy and sell cryptocurrency, but some investing apps charge 0%.

Additionally, there is no requirement to purchase an entire coin. You can begin with as little as one dollar.

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