The Twitter accounts of major companies and individuals have been compromised in one of the most widespread and confounding hacks the platform has ever seen, all in service of promoting a bitcoin scam.

It all began when Elon Musk’s Twitter account was seemingly compromised by a hacker intent on using it to run a bitcoin scam.

Microsoft co-founder bill gates also had his account hacked by the same hackers, who posted a similar message with an identical bitcoin wallet address. Both accounts continued to post new tweets promoting the scam almost as fast as they are deleted.

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A spokesperson for Gates tells Recode’s Teddy Schleifer, “We can confirm that this tweet was not sent by Bill Gates. This appears to be part of a larger issue that Twitter is facing. Twitter is aware and working to restore the account.”

Shortly after the wave of tweets from Gates and Musk’s accounts, the accounts of Barak Obama, Apple, Uber, Amazon CEO Jeff Bezos, Democratic presidential candidate Joe Biden, hip-hop mogul Kanye West, and former New York City mayor and billionaire Mike Bloomberg, among others, were also compromised and began posting the scam.

The origin of the scam appears to be when Musk’s account issued a mysterious tweet at 4:17PM ET reading, “I‘m feeling generous because of Covid-19. I’ll double any BTC payment sent to my BTC address for the next hour. Good luck, and stay safe out there!” The tweet also contained a bitcoin address, presumably one associated with the hacker’s crypto wallet.

The investigation is going on but Twitter has taken security measures to prevent further attacks. Twitter has locked the compromised accounts. They will be restored once the company will be confident about security measures.

Most of the accounts will be able to operate normally and the company is working to streamline their services.