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  • Interview question: How Compatibility Between ERC-721 and ERC-1155 NFT works?

    amanda smith

    Member

    Updated: Apr 19, 2025
    Views: 1.0K

    I had a interview recently with NFT project and I could not answer the question confidently. Can anyone help me to understand it for next interview.

    In an NFT contract that supports both ERC-721 and ERC-1155 standards. ERC-721 works for single, unique NFTs, while ERC-1155 supports single and batch minting. It should allow the contract to handle both, expanding its use across platforms that require either standard.

    How can we achieve smooth functionality for both standards in a single contract. how we can make minting work for individual NFTs and in batches, based on different needs, without increasing gas fees unnecessarily. I’m looking for tips on contract structure, relevant libraries, or any approach that has proven effective. Thank you!

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  • Lilly Gomes

    Member • 5mos

    To build an NFT contract that supports both ERC-721 and ERC-1155 standards, focus on a clear, modular structure and efficient gas usage to achieve compatibility across platforms and marketplaces.

    1. Use Solidity Inheritance: Structure your contract by inheriting from both ERC-721 and ERC-1155 standards. OpenZeppelin libraries can provide reliable base contracts for this, allowing you to handle single and batch minting in one contract. ERC-721 is ideal for single unique NFTs, while ERC-1155’s batch functionality supports multiple tokens in a single transaction.

    2. Separate Minting Functions: Define distinct functions for each type of minting. For example, use a mint function for single NFT (ERC-721) minting and mintBatch for ERC-1155 batch minting. This division keeps the logic clear and reduces gas costs by limiting unnecessary computations within each function.

    3. Optimize Gas Usage: Reduce gas fees by minimizing storage updates and reusing storage variables where possible. Use ERC-1155’s batch minting where applicable, as it can handle multiple items more efficiently. Offload metadata to an off-chain source when feasible, with only a reference stored on-chain to cut down on storage costs.

    4. Ensure Compatibility with Marketplaces: Implement interfaces like IERC721, IERC1155, and IERC165. These interfaces help marketplaces recognize the standards, allowing smooth listing and trading. Compatibility checks are key to making your contract widely accessible.

    5. Test Thoroughly: Use tools like Hardhat and Truffle to run comprehensive tests on single and batch minting functions. Test on various wallets and platforms to confirm your contract’s compatibility and performance under different conditions.

    This method will allow your NFT contract to handle both single and batch minting efficiently, supporting widespread usage and marketplace compatibility.

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