NFT Contract

Verified Contract:

https://etherscan.io/address/0x51369E8C482763089b0b90009C2A79C98244168E#code

• Unifriends.sol

  • ERC721Enumerable w/ optimization tweaks

  • On-chain metadata for properties and stats

  • Off-chain image asset stored in IPFS

• UnifriendsRenderer.sol

  • Logic for deriving properties from a seed

On-chain metadata

function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        require(_exists(tokenId), "Token does not exist.");

        if (!isRevealed) {
            return preRevealMetadata();
        }

        return
            UnifriendsRenderer.base64TokenURI(
                tokenId,
                baseURI,
                animationURI,
                tokenIdToRandomNumber[tokenId]
            );
    }

Pseudo-randomness for properties for gas cost savings. Chainlink VRF was about 3x gas to run

function pseudorandom(address to, uint256 tokenId)
        private
        view
        returns (uint256)
    {
        return
            uint256(
                keccak256(
                    abi.encodePacked(
                        block.difficulty,
                        block.timestamp,
                        to,
                        Strings.toString(mintNonce),
                        Strings.toString(tokenId)
                    )
                )
            );
    }
}