Lean Mean

Like physical money, cryptocurrencies are fungible i.e., they can be traded or exchanged, one for another. For example, one Bitcoin is always equal in value to another Bitcoin. Similarly, a single unit of Ether is always equal to another unit. This fungibility characteristic makes cryptocurrencies suitable for use as a secure medium of transaction in the digital economy.

NFTs shift the crypto paradigm by making each token unique and irreplaceable, thereby making it impossible for one non-fungible token to be equal to another. They are digital representations of assets and have been likened to digital passports because each token contains a unique, non-transferable identity to distinguish it from other tokens. They are also extensible, meaning you can combine one NFT with another to “breed” a third, unique NFT.  

Just like Bitcoin, NFTs also contain ownership details for easy identification and transfer between token holders. Owners can also add metadata or attributes pertaining to the asset in NFTs. For example, tokens representing coffee beans can be classified as fair trade. Or, artists can sign their digital artwork with their own signature in the metadata.  

NFTs evolved from the ERC-721 standard. Developed by some of the same people responsible for the ERC-20 smart contract, ERC-721 defines the minimum interface – ownership details, security, and metadata – required for exchange and distribution of gaming tokens. The ERC-1155 standard takes the concept further by reducing the transaction and storage costs required for NFTs and batching multiple types of non-fungible tokens into a single contract.

Perhaps the most famous use case for NFTs is that of cryptokitties. Launched in November 2017, cryptokitties are digital representations of cats with unique identifications on Ethereum’s blockchain. Each kitty is unique and has a price in ether. They reproduce among themselves and produce new offspring, which have different attributes and valuations as compared to their parents. Within a few short weeks of being launched, cryptokitties racked up a fan base that spent $20 million worth of ether purchasing, feeding, and nurturing them. Some enthusiasts even spent upwards of $100,000 on the effort.

NFTs can enable the efficient commercialisation of unique assets that are otherwise difficult to sell or prove ownership of, as well as the creation of entirely new digital product lines and revenue streams.

As with many other digital assets, some NFTs offer the ability to "fractionalise" ownership of the underlying asset, i.e. to split ownership so that each purchaser of an NFT benefits from the underlying asset in proportion to the fraction they own, which can enable new ownership structures that proponents assert have the potential to democratise ownership of assets that have traditionally been viewed as inaccessible. However, other NFTs  are indivisible.