MLB attempted to introduce crypto collectibles in 2018, but failed. This time, however, the NFT craze is in full swing. On Wax, Topps and MLB will release a 2021 baseball card NFT series. These are the first official National Football League (NFL) cards that MLB has approved. Non-fungible tokens, or NFTs, are crypto tokens centred on the blockchain that, unlike Bitcoin, reflect ownership deeds to digital or physical properties.