$608,000 for a picture of a rock might sound too wild to be real. But today, one crude illustration from NFT project EtherRocks sold for just that. Now sellers want even more for the flashy JPEGs. The cheapest pet rock sells for $1 million. Just yesterday, the cheapest rock was priced at $305,000, and only two weeks ago, one sold for $100,000. {tweet} The buyer of yesterday’s cheapest rock could have made $400,000 if they sold at today’s market rate. The rocks are NFTs, or non-fungible tokens: blockchain-based tokens that demonstrate ownership over digital items, such as images or video files, or physical assets. ... (full story)