[CryptoSkulls](https://cryptoskulls.com) are made up of 10,000 collectible ERC-721 Non-Fungible Tokens (NFTs) stored on the Ethereum Blockchain. **CryptoSkulls** first launched in 2019 and it is widely believed **CryptoSkulls** was the *second ever 10,000 supply profile picture (pfp) collection* to launch following CryptoPunks, as a result **CryptoSkulls** are commonly referred to as a 'Historical' collectible throughout the web3 community.