What happened Shares of the Chinese fintech Jiayin Group (NASDAQ: JFIN) plunged by more than 17% in the early hours of trading for no apparent reason, although it could be related to speculation regarding nonfungible tokens (NFTs). So what NFTs are digital files such as art, video, audio, and other files stored on blockchain, which is the digital ledger technology that powers cryptocurrencies like Bitcoin (CRYPTO: BTC). Some NFTs have already sold for millions of dollars. The Jiayin Group is not currently involved in NFTs in any way. The company runs an online individual loan marketplace that seeks to reach underserved customers in China. However, recent buzz on Twitter yesterday had people saying the company could potentially get involved in the NFT space, and shares surged 75%. Image source: Getty Images. Although it is again unclear what caused the shares to fall, stocks that rose yesterday on NFT speculation have cooled off today since Tesla Founder Elon Musk poked fun at NFTs on Twitter last night. Now what Some NFTs have already sold for tens of millions of dollars, but this is still a new market in the very early days. Even after the dip today, shares of Jiayin are still up significantly over the last five days. I expect NFTs will remain volatile for some time, so any stock linked to NFT speculation will likely do the same. Invest with extreme caution. 10 stocks we like better than Jiayin Group IncWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Jiayin Group Inc wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of February 24, 2021 Bram Berkowitz owns shares of Bitcoin. The Motley Fool owns shares of and recommends Bitcoin. The Motley Fool has a disclosure policy.Source