CryptoSkulls are 10,000 collectible ERC-721 Non-Fungible Tokens stored on Ethereum blockchain. Each CryptoSkull character is unique pixel art image.
Each CryptoSkull has its UNIQUENESS INDEX that shows total rareness of all image features. For example, CryptoSkulls with beards are rarer than without beards and have less UNIQUENESS INDEX. Each CryptoSkull (except 10 SKULL LORDS that are not generated but hand drawn) has its X-gene value saved at the moment of CryptoSkull generation. X-gene is a set of CryptoSkull feature indexes. UNIQUENESS INDEX is calculated by X-gene analysis. Possible UNIQUENESS INDEX values are 1 (SKULL LORDS), 2, 5, 11, 12, 13, 15, 16, 22, 25, 26.
All CryptoSkulls in one image
CryptoSkulls contract on Etherscan (verified):
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