Uses and applications of ERC-721 tokens
One of the first examples of use we could experience with the CryptoKitties y Decentraland. Of these examples, the most talked about is perhaps the first. The DApp CryptoKitties, is a game that allows you to own, breed and match virtual feline characters. Each kitten represents an ERC-721 token and this one presents unique characteristics that differentiate it from any other kitty. A kind of digital mascot on a blockchain. In addition, CryptoKitties allows you to perform other actions, among which stand out: collecting and searching for other cats with even more peculiar attributes.
With this, CryptoKitties makes you a collector of virtual cats that base their value on rarity. For this reason it is not strange to observe that those who participate in this game put their crawls digital in exchange for significant sums of money. Perhaps the greatest example in this regard is the CryptoKitties Genesis Cat, which sold for an amount of 247 ETH (about $ 117.000 USD) on December 2, 2017.
Something similar has happened with Decentreland, a game where you get a lot of virtual land where you can build. On one occasion, for example, a Decentreland lot was auctioned for $ 9.000.
However, beyond the games section, the ERC-721 token has other possibilities. For example, we can use it to cryptographically secure the ownership and possession of different elements in real life. Such elements can be houses, land, vehicles and even a cryptographically secure virtual identity. As you see, the 721 token would play a role very similar to that of title or writing, which assigns ownership to whoever owns it.
No matter what it is, if what you plan to tokenize is unique in all its aspects, the ERC-721 standard is designed precisely to help you in that task and allow you to transform it into a token within the Ethereum blockchain.