The tweet, which says, “just setting up my twttr,” was first posted by Dorsey on March 21, 2006.

NFTs are digital assets, including jpegs and video clips, that can be bought and sold, just like physical assets. And since they run on blockchain, a decentralized digital ledger that documents transactions, ownership and validity of each can be tracked.

Though there was a bidding war over the NFT of Dorsey’s tweet between tech entrepreneur Justin Sun and Bridge Oracle CEO Sina Estavi, ultimately, Estavi’s bid of over $2.9 million won, the site says. Estavi also bid $1.1 million to own the NFT of a recent tweet by Elon Musk, CEO of SpaceX and Tesla, which was also listed on “Valuables.”

Meanwhile Jack has kept to his words by sending the money on the auction to a charity organization in Africa. Dorsey said that all proceeds from his NFT sale would be converted to bitcoin and donated to GiveDirectly, an organization helping those living in poverty in Africa.

“Sent to @GiveDirectly Africa fund,” Dorsey tweeted on Monday. “Thank you, @sinaEstavi.