Non-fungible tokens (NFTs) have been widely adopted by the sports, arts, music, gaming, fashion, and other industries. Behind the hype is a fast-developing ecosystem of technical and commercial innovation that is embracing the promise of bridging physical world concepts of uniqueness and scarcity with the digital world. The NFT market has seen enormous growth in recent years, with sales of NFTs reaching $25 billion in 2021 by one estimate, and this is only expected to grow as creators and brands craft their plans for the metaverse in which NFTs are expected to play a critical role....