# ACECTF 2025 - Insanity Check **Title:** Insanity Check **Description:** You might've breezed through the easy Sanity Check, but this challenge is for true contenders! If you want to prove your sanity is as unhinged as mine, you’ll have to earn it. How, you ask? Back when we were building these CTF challenges, everyone would upload their carefully crafted puzzles, and I was the one reviewing them. But me being me—I rejected a ton of them, tossing them straight into the bin for all sorts of reasons. Naturally, my teammates started questioning my sanity, some even calling me insane. But if there was one thing that remained constant, it was the bin. Now, it’s your turn to dig in and you already know where to start... The same place where you proved you were sane! I think you must be in the Discord server by now - [https://discord.gg/BWYPxRQPSd](https://discord.gg/BWYPxRQPSd) ## Solution: 1. **Clue from the Hint:** The challenge hint asked, “Did you guys notice some weird roles in the server?” One role, `r8F53sXv`, immediately caught our attention. 2. **Leveraging Discord’s API:** By querying the endpoint: ``` https://discord.com/api/v9/guilds/[guild-id]/roles/[role-id]/member-ids ``` ![image](https://hackmd.io/_uploads/HkMBHKSske.png) we retrieved a single user ID: `1317845656676597782`. 3. **Following the Breadcrumbs:** Mentioning `<@1317845656676597782>` revealed that this user is labeled as `@PasteBin`. This prompted us to check if the string is a PasteBin identifier, leading us to [https://pastebin.com/r8F53sXv](https://pastebin.com/r8F53sXv), which contained: ```bash You found Mr. Paste Bin! ACECTF{7h47_w45_1n54n3} ``` 4. **Flag Discovery:** The PasteBin content confirmed our suspicions and provided the flag: `ACECTF{7h47_w45_1n54n3}`.