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.
The CryptoSkulls project pre-dates typical NFT rarity systems and utilizes an organic system called “Uniqueness Index” to attempt to establish trait rarity. The lower the UI, the rarer the features!
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