The anomaly left telltale signs of Coin Hive — a piece of code that can be installed on websites that, when active, diverts unused computational power on visitors' computers toward generating a Bitcoin-like currency called Monero. Under ordinary circumstances, said Mursch, Coin Hive is used by some websites as an alternative to advertising. But in the case of PolitiFact, somebody has programmed the site to run multiple versions of Coin Hive simultaneously, basically bringing any visitor's computer to a processing halt.

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The phenomenon was soon confirmed by security journalist Brian Krebs.

The issue may be related to a third-party ad provider, said Aaron Sharockman, executive director of PolitiFact, which is owned by the Tampa Bay Times.

“It's frustrating,” he said. “I'm escalating now with our ad and IT folks and I'll get back to you.”

Virtual currencies such as Monero run on digital “coins” that get created when one or more computers that are controlled by a person successfully solve a math problem. Throwing more computational power at the problem means solving it faster — and the more efficiently you can be awarded a new coin.

Forcing PolitiFact visitors to participate in this operation at such a scale — in many cases without their knowledge or consent — makes this use of Coin Hive malicious, said Mursch. In some cases, turning off JavaScript or using an ad-blocker could help thwart the code, but not always, given how quickly variants of the software can be created.

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This isn't the first time we've seen Coin Hive being deployed on major websites. The premium cable channel Showtime was recently discovered to have been running the script, though it has since been deleted from the site. The peer-to-peer filesharing site the Pirate Bay has also experimented with it.