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The Metana Blog
Meet our authors →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 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…
Ana RojoJuly 15, 2024Read
Smart ContractsAre Compiler Bugs in Smart Contracts a Hidden Risk?
Web3 development thrives on smart contracts – self-executing programs on the blockchain. These contracts are written in high-level languages like Solidity and then compiled into machine code that the blockchain…
Metana EditorialJuly 13, 2024Read
Smart ContractsCombating Frontrunning: Ensuring Fairness in Web3 DEXes
Web3 promises a democratized financial landscape, but a shadow lurks within its decentralized exchanges (DEXes) – Frontrunning . This exploitative practice leverages knowledge of upcoming transactions to gain an unfair…
Metana EditorialJuly 12, 2024Read
Smart ContractsAre You Assuming Immutability? Pitfalls and Solutions in Web3
Immutability – the cornerstone of blockchain technology – guarantees that once data is written, it cannot be altered. This concept empowers transparency and trust, making blockchain a revolutionary technology for…
Metana EditorialJuly 12, 2024Read
Smart ContractsMitigating Overpowered Admins in Web3 for Better Security
Decentralization is the cornerstone of Web3, aiming to empower users and reduce reliance on centralized control. However, a common pitfall in Web3 development contradicts this very principle: Overpowered Admins .…
Metana EditorialJuly 11, 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…
Georgi PlamenovJuly 11, 2024Read
Smart ContractsAvoiding Try-Catch Misuse: Securing Solidity Smart Contracts Effectively
Exception handling is a crucial aspect of any programming language, and Web3 development with Solidity is no exception. The try-catch block offers a mechanism to gracefully handle errors and unexpected situations within…
Metana EditorialJuly 10, 2024Read
Smart ContractsUpgrade Bugs: Overcoming Challenges in Smart Contract Upgrades
Web3 thrives on innovation, but unlike traditional software, upgrades to deployed smart contracts can be a tricky affair. The very nature of blockchain immutability presents a challenge: Upgrade Bugs . Let's explore the…
Metana EditorialJuly 9, 2024Read
Smart ContractsUnchecked Return Values: Hidden Threats in Smart Contracts
Web3 thrives on the power of smart contracts – self-executing programs that automate tasks on the blockchain. However, a seemingly minor oversight – unchecked return values – can have major consequences. Let's explore…
Metana EditorialJuly 8, 2024Read
Smart ContractsTop DeFi Lending and Staking Protocol Vulnerabilities and Mitigations
Decentralized Finance (DeFi) has revolutionized financial services, offering lending and staking opportunities without the need for intermediaries. However, these protocols are not without their weaknesses. Lending and…
Metana EditorialJuly 7, 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…
Georgi PlamenovJuly 6, 2024Read
Smart ContractsProtect Yourself from Rug Pulls: Tips to Avoid Crypto Scams
The world of Web3 is brimming with promises of high returns and revolutionary projects, driving a wave of excitement among investors and developers alike. Yet, amid this innovation lies a sinister threat that can…
Metana EditorialJuly 5, 2024Read
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