Sina Estavi garnered international attention last March when he bought a nonfungible token of the first-ever Tweet. He paid almost $3 million for the NFT, held it for more than a year, then placed it for sale on a popular NFT auction site earlier this month.

Estavi started the bidding on OpenSea at $48 million, but after nine days, no bid has reached even a fraction of that figure. The highest bid as of Friday was 4.2 ether, or roughly $12,600.

The auction's flop is a sign the NFT market is starting to cool off, one blockchain expert told CBS MoneyWatch.

Estavi said on Twitter that he wanted to donate the proceeds from his NFT sale to a charity. Now, given the poor auction results, Estavi is reportedly unsure of his next move. Estavi didn't respond to requests for comment from CBS News.

"My offer to sell was high and not everyone could afford it," Estavi told Reuters on Thursday, when the highest bid was worth $280. "It's important to me who wants to buy it, I will not sell this NFT to anyone because I do not think everyone deserves this NFT."