CryptoPunks are collectible pieces of crypto art, represented by NFTs on the Ethereum blockchain. There are 10,000 small, 8-bit-style punks, all with unique features. As one of the first famous NFT projects, they inspired a lot of crypto artists and even the development of the ERC-721 token standard for digital collectibles. The project became more popular in 2021 after some CryptoPunks were sold for millions of dollars, making them some of the most expensive NFTs.