Answers.md

Advanced NFT Assignment - Answers

1. Should you use Pausable or NonReentrant in your NFT?

• Pausable: No, since important function can be paused using state machine.
• NonReentrant: Yes, to protect against reentrancy attacks, especially during fund withdrawals.

2. What trick does OpenZeppelin use to save gas on the NonReentrant modifier?

OpenZeppelin's NonReentrant modifier saves gas by using a single storage slot with two states (entered/not entered) to track function reentrancy, minimizing costly storage operations. This simple status flag approach efficiently prevents reentrancy attacks with minimal gas overhead.