NFT Minting and Burning Mechanics 2

Question 1

In ERC-721, which internal function is typically called to create a new token and assign it to an address?

Accepted Answer

_mint(to, tokenId)

Answer

_mint(to, tokenId) creates a new token and assigns ownership to the given address.

Question 2

What event must be emitted when a token is minted in a compliant ERC-721 contract?

Accepted Answer

Transfer event with from set to the zero address

Answer

Minting emits a Transfer event where the 'from' address is the zero address.

Question 3

When a token is burned in ERC-721, what is the 'to' address in the emitted Transfer event?

Accepted Answer

The zero address (0x0)

Answer

Burning emits a Transfer event to the zero address, removing the token from circulation.

Question 4

Why does OpenZeppelin's _mint revert if the destination is the zero address?

Accepted Answer

Minting to address(0) would be indistinguishable from a burn

Answer

Allowing a mint to the zero address would collide with the convention that burns target address(0).

Question 5

What happens to the totalSupply tracking when a token is burned in an enumerable ERC-721?

Accepted Answer

It decreases by one

Answer

Burning reduces the total supply count in enumerable implementations.

NFT Development Practice Test