Cryptocurrency is becoming increasingly common in investing circles and is arguably an asset class worth including in any long-term portfolio. But crypto is still a Wild West of sorts; there are seemingly endless options, few regulatory guardrails, and highly public instances of fraud that taint crypto's reputation.

The Grayscale Bitcoin Trust ETF (NYSEMKT: GBTC) is a spot Bitcoin exchange-traded fund (ETF) that addresses many of those concerns.

It's also a proven millionaire maker; a $10,000 investment at the trust's inception in mid-2015 would be worth over $1.2 million today. Originally traded over the counter, the ETF was uplisted to the New York Stock Exchange this year.

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Source Fool.com