Explained: How auction houses are chasing crypto millions

Sotheby's has sold $65 million of non-fungible tokens, or NFTs, in 2021, while arch-rival Christie's has sold more than $100 million of the new type of crypto asset, which uses blockchain to record who owns digital items such as images and videos, even though they can be freely viewed, copied and shared like any other online file. Here’s how with Emma Jehle.