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Knowledge Flashcards

7 cards from real NFT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the purpose of the approve() function in ERC-721?

    Answer: To grant another address permission to transfer a specific token

    approve authorizes a single address to transfer a particular token on the owner's behalf.

  2. What does setApprovalForAll() do?

    Answer: Grants an operator permission over all of the owner's tokens

    setApprovalForAll authorizes an operator to manage every token an owner holds in that contract.

  3. Why is using OpenZeppelin's audited contracts recommended for NFT development?

    Answer: They provide tested, secure implementations of standards

    OpenZeppelin offers community-audited, standard-compliant implementations that reduce security risk.

  4. What happens when an NFT is 'burned'?

    Answer: It is permanently destroyed and removed from circulation

    Burning destroys a token, typically by sending it to the zero address, permanently reducing supply.

  5. Which Solidity pattern helps prevent reentrancy attacks during minting or withdrawals?

    Answer: Checks-Effects-Interactions

    The Checks-Effects-Interactions pattern updates state before external calls, preventing reentrancy.

  6. What is 'lazy minting'?

    Answer: Deferring the on-chain mint until the first purchase, often via a signed voucher

    Lazy minting delays the actual on-chain mint and its gas cost until a buyer purchases the NFT.

  7. What does the supportsInterface() function (ERC-165) allow?

    Answer: Detecting which standards a contract implements

    ERC-165's supportsInterface lets callers query whether a contract implements a given interface like ERC-721.