Before the dawn of ERC-721, tokens on blockchain were only fungible, meaning they can be traded or exchanged with another identical one of the same value, much like a dollar bill.
Originally built on the Ethereum blockchain, CryptoKitties was the first non-fungible token (NFT) that allowed the creation of unique digital collectibles as kitties, using the ERC-721 smart contract. Mention NFT revolution and you will most likely stumble upon this project over and over again: CryptoKitties. CryptoKitties-Like NFT with ERC-721 Smart Contract Deploy and Mint a CryptoKitties-Like NFT with ERC-721 Smart Contract
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