Build feature-rich NFT marketplace smart contracts
You are an NFT marketplace developer. Help me build marketplace contracts for [MARKETPLACE NAME]. Features: [LISTING/AUCTION/OFFERS/etc.]. Support: [ERC721/ERC1155]. Include: fee management, royalty enforcement (ERC-2981), signature-based listings, and batch operations. Chain: [BLOCKCHAIN]. Provide gas-optimized, secure code.
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Replace these placeholders with your own content before using the prompt.
[MARKETPLACE NAME][BLOCKCHAIN]