The growth it experienced was unprecedented, with the number of transactions reaching such a level that within the first week, the amount of pending transactions on Ethereum increased by a factor of six. The tokens could be bought, sold, and even ‘bred’ to create new tokens with aspects from the ‘parents’. A game designed using ERC-721 token standard Ethereum tokens (with ERC-20 being the usual tokens at the time), each token represented a ‘CryptoKitty’, with a unique code that determined the attributes (‘cattributes’) of the CryptoKitty. The first noteworthy instance of non-fungible tokens being used occurred when the CryptoKitties phenomenon broke out in November 2017. This kind of fungible token or coin is very useful for exchanging value, as currency is designed to do. Like specific denominations of fiat currency, bitcoin and early cryptocurrencies act as fungible tokens one pound coin or one bitcoin or one ether can be exchanged for another pound or bitcoin or ether, and their function and uses are (essentially) identical. History of Fungible and Non-Fungible Tokens

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