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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. Which Ethereum standard is most commonly used to implement non-fungible tokens?

    Answer: ERC-721

    ERC-721 is the canonical standard defining unique, non-fungible tokens on Ethereum.

  2. What does the tokenURI function in an ERC-721 contract typically return?

    Answer: A pointer to the token's metadata (often JSON)

    tokenURI returns a URI pointing to a metadata document describing the NFT.

  3. Why are NFT images and metadata often stored on IPFS rather than directly on-chain?

    Answer: On-chain storage of large files is prohibitively expensive in gas

    Storing large media on-chain costs enormous gas, so decentralized off-chain storage like IPFS is used.

  4. In ERC-721, which function transfers ownership while checking the recipient can handle NFTs?

    Answer: safeTransferFrom()

    safeTransferFrom verifies that a contract recipient implements onERC721Received before transferring.

  5. What is 'minting' an NFT?

    Answer: Creating a new token and recording it on-chain

    Minting is the process of generating a new token and writing it to the blockchain.

  6. Which event must an ERC-721 contract emit when a token changes owner?

    Answer: Transfer

    The Transfer event signals ownership changes including mints and burns.

  7. What advantage does ERC-1155 offer over ERC-721?

    Answer: It can manage multiple token types (fungible and non-fungible) in one contract

    ERC-1155 is a multi-token standard supporting batch operations and mixed token types in a single contract.