That didn't take long. Prices for digital collectibles like art and sports memorabilia are sliding, turning the focus back on whether the nascent market for so-called non-fungible tokens is any more than a fleeting mania. Average prices for NFTs -- essentially tradable digital certificates that use blockchain technology to prove ownership and provenance of online assets -- have tumbled almost 70% from a peak in February to about $1,400, according to Nonfungible.com, which tracks a variety of NFT marketplaces. https://www.bloomberg.com/news/arti...rs-debate-on-whether-stimulus-led-fad-is-over