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McAfee's Dick TweetMcAfee's Dick Tweet

On July 17, 2017, Bitcoin was trading near $1,800, still digesting a run that had tripled the price since January. Somewhere in a Twitter thread about where it might go next, John McAfee — the antivirus pioneer turned fugitive eccentric — typed out a reply that would define the last four years of his life: Bitcoin would hit $500,000 within three years, or he would eat his own dick on national television.

It was a plain text reply, no chart, no link. It became one of the most screenshotted posts in Bitcoin history.

The bet did real work. CNN, CNBC, and mainstream outlets that had ignored Bitcoin for years suddenly had a hook: famous millionaire wagers his anatomy on magic internet money. A tracker site nicknamed "the dickening" plotted BTC's actual price against the exponential curve required to reach $500K by July 2020, and for a stretch of the 2017 bull run the price was actually ahead of schedule.

McAfee leaned in. In November 2017 he raised the target to $1 million by December 31, 2020, same forfeit. He claimed proprietary mathematical models backed the number, invoking his doctorate in point-set topology and insisting his algorithms were "never wrong."

The bet built him a massive Twitter following, and that following became the product. Through 2018 and 2019, a single McAfee "coin of the day" tweet could move a thinly traded altcoin 50 to 100 percent within hours. Traders called it the McAfee Effect, and many rode it knowingly, front-running the front-runner.

The Department of Justice later laid out what was actually happening. According to the March 2021 indictment, McAfee's team quietly accumulated positions in small altcoins, he tweeted endorsements without disclosing he was being paid, and the team sold into the spike his tweets created. The scheme netted over $2 million, on top of more than $11 million in undisclosed fees for promoting ICOs to his followers — over $13 million in hidden compensation altogether.

The prediction itself died first. In June 2020, with Bitcoin near $9,000 and his deadline weeks away, McAfee renounced the bet entirely, calling it a deliberate "ruse to get people to see the light" — recasting the wager as a marketing stunt for adoption rather than a forecast he ever believed.

The unwinding was fast from there. In October 2020, Spanish authorities arrested him at the Barcelona airport on US tax charges: he had earned millions from consulting, speaking fees, and selling the rights to his life story while filing no returns from 2014 through 2018. In March 2021 came the DOJ indictment over the pump-and-dump and ICO scheme. He spent eight months in Brians 2 prison outside Barcelona fighting extradition.

On June 23, 2021, hours after a Spanish court approved sending him to the United States, McAfee was found dead in his cell. The ruling was suicide by hanging. He had repeatedly tweeted that he would never take his own life, and the conspiracy theories began within minutes of the news breaking.

The $500K bet is remembered as a punchline. But it was also a demonstration, years before "influencer" became a regulatory category, of how much market-moving power a single loud account could accumulate — and what happens when that power becomes the business model.

Part of an ongoing series on Bitcoin history. New thread every day at @daily_btc_lore.