awesome tutorial! I'm trying to wrap my head around how to make this only claimable every 24 hours per address. got this import "@openzeppelin/contracts/access/Ownable.sol"; contract EpicNFT is ERC721URIStorage, Ownable { mapping ( address = > bool ) claimableAddresses; function _setClaimable ( address _addr, uint256 _lastClaimedDate ) private onlyOwner { if (( block . timestamp - _lastClaimedDate) > 24 hours ) { claimableAddresses[_addr] = true ; } } but I can't seem to make it work correctly... any idea?