20% OFF - limited-time enrollment offer.
Applied automatically when you book a call before the timer hits zero.
--
Days--
Hours--
Minutes--
Seconds- Guarantee: Job or 100% money back
- Expert-curated curriculum
- On-demand mentor support
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.
Smart ContractsFlash Loan Attacks in Smart Contracts
Flash loans, a cornerstone of DeFi (Decentralized Finance), offer exciting liquidity possibilities. But in the wrong hands, they can become a developer’s nightmare – fueling flash loan attacks. These attacks exploit vuln
Metana EditorialJune 27, 2024Read
Smart ContractsGovernance Attacks in Smart Contracts
In the realm of Web3, the concept of decentralization is not just a buzzword—it’s a fundamental principle. Decentralized Autonomous Organizations (DAOs) epitomize this ethos, where token holders collectively make decisio
Metana EditorialJune 26, 2024Read
Smart ContractsInsecure Randomness in Smart Contracts
In the dynamic and evolving landscape of Web3, randomness plays a crucial role in ensuring the fairness and unpredictability of various applications. From provably fair gaming to the generation of unique tokens, the inte
Metana EditorialJune 25, 2024Read
Smart ContractsExcessive Function Restriction in Smart Contracts
In the world of blockchain and smart contracts, security is paramount. However, there’s a fine line between ensuring security and creating rigid, inflexible systems. One common pitfall in smart contract design is excessi
Metana EditorialJune 25, 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
Smart ContractsImproper Input Validation in Smart Contracts
TL;DR In the world of smart contracts, where code governs the execution of transactions and other functions, the importance of proper input validation cannot be overstated. Just like a picky eater, a smart contract shoul
Metana EditorialJune 23, 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
Smart ContractsReentrancy Attack in Smart Contracts
In a traditional transaction, one party sends funds to another in exchange for goods or services. This exchange typically follows a well-defined sequence of steps. However, in the realm of smart contracts, vulnerabilitie
Metana EditorialJune 21, 2024Read
SolidityAccess Control in Solidity Smart Contracts
Access control is a crucial aspect of smart contract security, governing who is authorized to perform specific actions within the contract. Just as a bouncer at an exclusive club ensures only permitted guests enter, acce
Metana EditorialJune 20, 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
BlockchainExploring the Mempool: A Deep Dive
Have you ever sent a cryptocurrency payment and felt like it’s taking forever to confirm? You’re not alone. Unlike swiping your debit card, crypto transactions don’t happen instantaneously. There’s a waiting room for tra
Metana EditorialJune 18, 2024Read
BlockchainToken Standards: ERC-20, ERC-721, and More
Imagine a world where anything digital can be securely owned and traded. Artwork, in-game items, concert tickets, even your loyalty points – all represented by unique digital tokens stored on a transparent ledger. This i
Metana EditorialJune 17, 2024Read
Talk to an advisor
Book a call with a real human before the next cohort fills.
Speak with an advisor. We'll map the right program to your goals - and lock in your enrollment offer.