NFT Minting and Burning Mechanics 3

Question 1

In ERC-1155, which function mints a quantity of a fungible token id to an address?

Accepted Answer

_mint(to, id, amount, data)

Answer

ERC-1155 _mint takes an id, an amount, and a data parameter for batched/semi-fungible tokens.

Question 2

What is the main gas advantage of ERC-1155 _mintBatch over multiple ERC-721 mints?

Accepted Answer

Multiple token ids are minted in a single transaction

Answer

Batch minting creates several token ids in one call, saving per-transaction overhead.

Question 3

Which event does ERC-1155 emit for a single burn operation?

Accepted Answer

TransferSingle with the 'to' field as the zero address

Answer

ERC-1155 burns emit TransferSingle with the destination set to address(0).

Question 4

In ERC-1155, what must hold true for _burn(from, id, amount) to succeed?

Accepted Answer

The 'from' balance for that id must be at least 'amount'

Answer

Burning reverts if the holder's balance for the id is less than the amount being burned.

Question 5

When using lazy minting, when is the NFT actually written to the blockchain?

Accepted Answer

At the time of the first purchase or claim

Answer

Lazy minting defers the on-chain mint until a buyer triggers it, shifting gas to the buyer.

NFT Development Practice Test