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Bitcoin is Watch MILF Creampied Stepmoms 6 Onlinecomplicated. From what, exactly, it's good for to who created it, there remains a host of unanswered questions about the world's foremost cryptocurrency.

But when it comes to what drove the monumental price rise over the last 9 years, we now have at least a partial answer — and it's not what you'd think. You see, it turns out that one person or one coordinated group is likely responsible for a massive increase in Bitcoin's value back in 2013. Yup, just one.

SEE ALSO: You know who's not loving Bitcoin's rise? Speed freaks.

That's the conclusion of a group of researchers in the Journal of Monetary Economics, who write that the price of Bitcoin has been (surprise!) subject to manipulation over the years.

"Suspicious trades on a Bitcoin currency exchange are linked to rises in the exchange rate," they note in the paper highlights. "A single actor likely drove the USD/BTC exchange rate from $150 to $1000 in 2 months."

That's ... quite the jump to attribute to one person. And how did he or she allegedly pull this off? Sketchily.

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Let's harken back to 2013, when, according to the Wall Street Journal, the exchange Mt. Gox (which actually and truly started as a trading site for Magic: The Gathering cards) was handling roughly 70 percent of all Bitcoin trades. The researchers note that 600,000 Bitcoins "were fraudulently acquired" via trading on the exchange, and that "suspicious trades" corresponded with price increases that were outside of Bitcoin's normal growth.

To the moon. Credit: Jordan Mansfield/Getty Images

"Based on rigorous analysis with extensive robustness checks," the researchers note, "the paper demonstrates that the suspicious trading activity likely caused the unprecedented spike in the USD-BTC exchange rate in late 2013, when the rate jumped from around $150 to more than $1,000 in two months."

So what does this mean for Bitcoin's future? After all, this was all in the past, right? Tyler Moore, one of the researchers behind the study, thinks we should take note.

"While we do not know what has driven the recent spike in Bitcoin's value, we cannot rule out fraud," he explained over email. "Greater assurances are needed that the trades taking place are in fact legitimate and reflect buying and selling by independent actors. Unless and until such oversight is implemented, we cannot trust the exchange rate to reflect only legitimate sources of supply and demand."

In other words, it's important to keep in mind that the largely unregulated world of cryptocurrencies is potentially vulnerable to market manipulation. If someone wants to pump and dump, well, they probably can.

Does that mean that Bitcoin, or its less-popular altcoin brethren, are destined to crash? Not necessarily. It does mean, though, that anyone dipping their toe into the cryptocurrency pool should do so with the understanding that there may be actors working behind the scene to juice exchange rates. Buyer beware, and all that.

This story has been updated to include comment from Tyler Moore.

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