영상링크: https://www.youtube.com/watch?v=cWM3704pUns mapping 을 사용했습니다. 단순한 형태로 작성한거구요 솔리디티 코드: // SPDX-License-Identifier: GPL-3.0 // 0x281725fc1AD9AEDeFb8ADb1f4572E97CA918ED00 pragma solidity >=0.7.0 uint) private map_addr; bool use_whitelist = true; uint count = 0; constructor() { address a = 0x1e0A33d97f7793035704F5B0d896c631fb47BbE4; add_whitelist(a); } function is_whitelist(address addr) publi..