The idea isn't quite as far-fetched as it sounds at first glance.

There haven't been many investment success stories throughout history that can hold a candle to Bitcoin ( BTC -2.26% ) .

The world's original cryptocurrency , still the largest today, was launched in 2009 and has appreciated by over 20,000% since 2014. One of Bitcoin's most prominent backers and holders believes that its story still has plenty of chapters ahead.

Michael Saylor, executive chairman of Bitcoin treasury company Strategy , recently predicted that Bitcoin's price will reach approximately $21 million over the next 21 years. That would indicate an upside of 17,696% from the price as I write this of $118,000.

Strategy holds Bitcoin as its primary reserve asset. As of July 31, it said it owned 628,791

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