In October 2020, Miami-based art collector Pablo Rodriguez-Fraile spent almost $67,000 on a 10-second video artwork that he could have watched for free online. Last week, he sold it for $6.6 million.

The video by digital artist Beeple, whose real name is Mike Winkelmann, was authenticated by blockchain, which serves as a digital signature to certify who owns it and that it is the original work.

It's a new type of digital asset — known as a non-fungible token (NFT) — that has exploded in popularity during the pandemic as enthusiasts and investors scramble to spend enormous sums of money on items that only exist online.