Blockchain Developer Token Standards and NFTs 4

Question 1

What is the purpose of the ERC-2981 standard?

Accepted Answer

NFT royalty information

Answer

ERC-2981 provides a standard royaltyInfo interface so marketplaces can read royalty recipient and amount.

Question 2

Does ERC-2981 enforce that royalties are actually paid?

Accepted Answer

No, it only signals the amount; payment is up to the marketplace

Answer

ERC-2981 merely communicates royalty data; honoring it is voluntary for the marketplace.

Question 3

In ERC-721, what does safeTransferFrom add over transferFrom?

Accepted Answer

A check that contract recipients implement onERC721Received

Answer

safeTransferFrom verifies a contract recipient implements onERC721Received to avoid tokens being locked.

Question 4

What does setApprovalForAll(operator, true) do in ERC-721?

Accepted Answer

Authorizes an operator to manage all of the caller's tokens

Answer

It grants an operator permission to transfer any token the caller owns in that collection.

Question 5

Which approach reduces gas when minting many NFTs by tracking ownership across ID ranges?

Accepted Answer

ERC-721A batch minting

Answer

ERC-721A optimizes batch mints by deferring per-token owner writes, lowering gas for consecutive IDs.

Blockchain Practice Test