Minting and Burning Mechanics Flashcards
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Read the first 7 Minting and Burning Mechanics flashcards as text
In ERC-721, which internal function is typically called to create a new token and assign it to an address?
Answer: _mint(to, tokenId)
_mint(to, tokenId) creates a new token and assigns ownership to the given address.
What event must be emitted when a token is minted in a compliant ERC-721 contract?
Answer: Transfer event with from set to the zero address
Minting emits a Transfer event where the 'from' address is the zero address.
When a token is burned in ERC-721, what is the 'to' address in the emitted Transfer event?
Answer: The zero address (0x0)
Burning emits a Transfer event to the zero address, removing the token from circulation.
Why does OpenZeppelin's _mint revert if the destination is the zero address?
Answer: Minting to address(0) would be indistinguishable from a burn
Allowing a mint to the zero address would collide with the convention that burns target address(0).
What happens to the totalSupply tracking when a token is burned in an enumerable ERC-721?
Answer: It decreases by one
Burning reduces the total supply count in enumerable implementations.
Which access control pattern best restricts who can call a mint function?
Answer: A modifier like onlyOwner or onlyRole(MINTER_ROLE)
Role or ownership modifiers restrict minting to authorized addresses.
In a burn function, what check should occur before destroying a token?
Answer: That the caller is the owner or approved for the token
Only the owner or an approved operator should be permitted to burn a token.