Blockchain Developer Token Standards and Creation 3

Question 1

What is the key difference between ERC-721 and ERC-1155 token standards?

Accepted Answer

ERC-1155 supports both fungible and non-fungible tokens in one contract, ERC-721 only non-fungible

Answer

ERC-1155 is a multi-token standard handling fungible, non-fungible, and semi-fungible tokens together.

Question 2

Which ERC-721 function returns the owner of a specific token ID?

Accepted Answer

ownerOf(tokenId)

Answer

ownerOf(tokenId) returns the address that currently owns the given NFT.

Question 3

What is the primary purpose of the ERC-721 tokenURI() function?

Accepted Answer

Return a URI pointing to the token's JSON metadata

Answer

tokenURI() returns a link to metadata describing the NFT, often including name, image, and attributes.

Question 4

Why does ERC-1155 enable significant gas savings for transferring many tokens?

Accepted Answer

It supports batch operations like safeBatchTransferFrom in a single transaction

Answer

Batch transfer functions let multiple token types and amounts move in one transaction, reducing overhead.

Question 5

What safety check distinguishes safeTransferFrom from transferFrom in ERC-721?

Accepted Answer

It verifies the recipient contract implements onERC721Received

Answer

safeTransferFrom calls onERC721Received to ensure contract recipients can handle NFTs, preventing locked tokens.

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