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I'm trying to implement a functionality of giving a royalties to the owner after NFTs are sold on the secondary market. As I understand there is no default method or something to give a royalty, so I often see the following solution: https://github.com/jklepatch/eattheblocks/blob/master/screencast/379-nft-royalties/contracts/NFT.sol As I understand I have to pass a token to the constructor of this contract before deploying it. So the question is: if I want to mint and sell NFTs on the Ethereum Mainnet, which token should I pass inside the contract constructor? I see this guy implemented his own token for this purpose, but honestly I don't understand how is it compatible with ETH https://github.com/jklepatch/eattheblocks/blob/master/screencast/379-nft-royalties/contracts/MockToken.sol
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