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The Metana Blog
Guides, tutorials & career tips.
Expert-written guides on Full-Stack Development, Web3, AI, Data, and Cybersecurity — built for aspiring engineers and tech professionals ready to level up.
Ethernaut WalkthroughEthernaut Level 29 Walkthrough: The Switch Challenge Explained
The Ethernaut Level 29 Switch challenge revolves around understanding how dynamic CALLDATA is constructed and interpreted by Solidity contracts. The objective is to craft a CALLDATA payload that allows a single low-level
Seth TenenbaumJune 12, 2025Read
Ethernaut WalkthroughEthernaut Level 21 Walkthrough: Shop
In this article, we will walkthrough Ethernaut Level 21: Shop. This challenge is designed to test your understanding of how view functions interact with state changes in Solidity and how these interactions can be exploit
Ana RojoAugust 25, 2024Read
Ethernaut WalkthroughEthernaut Level 20 Walkthrough: Denial
Ethernaut Level 20: Denial focuses on a vulnerability related to denial-of-service (DoS) attacks. In this article, we’ll break down the Denial contract, identify its vulnerabilities, and explain how the Hack contract eff
Georgi PlamenovJuly 31, 2024Read
Ethernaut WalkthroughEthernaut Level 19 Walkthrough: Alien Codex
In this walkthrough, we will guide you through the Ethernaut Level 19: Alien Codex challenge. This challenge is designed to test your skills in array overflow and memory manipulation within Solidity. Our ultimate goal is
Ana RojoJuly 23, 2024Read
Ethernaut WalkthroughEthernaut Level 18 Walkthrough: Magic Number
As you may already know, The Ethernaut, from OpenZeppelin, is a series of challenges designed to teach and test your understanding of smart contract security. Well, today was the time for Ethernaut Level 18, titled “Magi
Ana RojoJuly 15, 2024Read
Ethernaut WalkthroughEthernaut Level 17 Walkthrough: Recovery
In the Ethernaut level 17 challenge, participants are tasked with finding and recovering Ether from a lost contract. The goal is to understand how contract addresses are derived and how this knowledge can be used to retr
Georgi PlamenovJuly 11, 2024Read
Ethernaut WalkthroughEthernaut Level 16 Walkthrough: Preservation
This article will break down the Ethernaut Level 16: Preservation contract, point out its flaws, and show how the Hack contract takes advantage of these weaknesses. Let’s dive into how delegatecall can be risky by lookin
Georgi PlamenovJuly 6, 2024Read
Ethernaut WalkthroughEthernaut Level 15 Walkthrough: Naught Coin
Ethernaut Level 15, “Naught Coin,” throws you headfirst into the world of ERC20 tokens and their potential vulnerabilities. This challenge presents a seemingly locked contract with a 10-year transfer lock on your own tok
Alexis AmoiJune 24, 2024Read
Ethernaut WalkthroughEthernaut Level 14 Walkthrough: Gatekeeper Two
Ethernaut challenges, comparable to a Web3-themed hacking Capture The Flag (CTF) competition, offer a dynamic environment for diving into Ethereum and Solidity programming. Each level, including Ethernaut Level 14, intro
Janos BarnaJune 22, 2024Read
Ethernaut WalkthroughEthernaut Challenge 13 Walkthrough: Gatekeeper One
TL;DR: Challenge 13: Gatekeeper One, also known as Ethernaut Level 13, stands out because it necessitates a thorough understanding of Ethereum transactions and gas mechanics. This article will delve into the GatekeeperOn
Georgi PlamenovJune 19, 2024Read
Ethernaut WalkthroughEthernaut Level 12 Walkthrough: Privacy
Ethernaut Level 12 titled “Privacy” challenges the concept of “private” data on the blockchain. In this level, you’ll encounter a locked contract, and your objective is to unlock it. The key, however, isn’t so private af
Alexis AmoiJune 12, 2024Read
Ethernaut WalkthroughEthernaut Level 11 Walkthrough: Elevator
Ethernaut challenges, comparable to a Web3-themed hacking Capture The Flag (CTF) competition, offer a dynamic environment for diving into Ethereum and Solidity programming. Each level introduces a distinct smart contract
Janos BarnaJune 10, 2024Read
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