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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.
BlockchainWhat is an Oracle in Blockchain? A Complete Guide
TL; DR: Oracle Blockchain Definition : Oracles are bridges that connect blockchains to external data sources and the real world Purpose : Enable smart contracts to access real-world data (prices, weather, IoT sensors)…
Metana EditorialJuly 23, 2025Read
BlockchainWhat are the 4 different types of blockchain technology?
Discover the 4 main types of blockchain technology: public, private, hybrid & consortium. Learn which blockchain type fits your business needs in 2025.
Metana EditorialJuly 21, 2025Read
Smart ContractsHow Do Signatures and Malleability Impact Web3 Security?
Web3 security relies heavily on digital signatures to verify the authenticity and authorization of transactions. However, a vulnerability known as signature malleability can pose a significant threat. This allows…
Metana EditorialJuly 21, 2025Read
BlockchainEthereum Testnets 2025: Rinkeby & Goerli Out, Sepolia In
Discover Ethereum Testnets in 2025: What Happened to Rinkeby and Goerli....and Why Sepolia Is Now the Standard.
Metana EditorialJuly 19, 2025Read
Crypto FaucetsHow to Deploy a Smart Contract to the Sepolia Testnet (4-minutes read)
Testing a smart contract without risking real ETH is a game-changer. The Sepolia testnet lets you do just that. This guide, shows you how to deploy a smart contract using MetaMask and a browser-based Solidity IDE, with f
Metana EditorialJuly 18, 2025Read
AI & Machine LearningScikit-Learn vs Tensorflow : Which One Should You Choose?
Choosing between Scikit-learn and TensorFlow depends on your goals. If you’re new to machine learning, Scikit-learn is simple and beginner-friendly. For deep learning or neural networks, TensorFlow offers advanced capabi
Metana EditorialJuly 18, 2025Read
AI & Machine LearningIs It Hard To Become A Data Analyst?
Question : Is it hard to become a data analyst? Direct Answer: It's challenging but absolutely achievable - becoming a data analyst requires dedication and continuous learning, but it's not insurmountable with the right…
Metana EditorialJuly 17, 2025Read
BlockchainWhat is the difference between BEP-20 and ERC-20?
TL;DR ERC-20 : Token standard on Ethereum - highly decentralized, widely adopted, but slower and more expensive . BEP-20 : Token standard on Binance Smart Chain (BSC) - faster , cheaper , but more centralized and less…
Metana EditorialJuly 16, 2025Read
Crypto FaucetsAre Crypto Faucets Safe To Use?
Yes. Crypto faucets are safe to use with precautions. Discover the importance of crypto faucet safety as millions seek free cryptocurrency. Understand the risks and how to protect your assets in the expanding digital cur
Metana EditorialJuly 16, 2025Read
Web3.0What Are WebSockets and How Do They Work?
TL;DR WebSockets are a protocol that enables real-time, bidirectional communication between clients and servers over a single persistent connection. Unlike HTTP's request-response model, WebSockets allow both parties to…
Metana EditorialJuly 15, 2025Read
Smart Contracts15 Common Smart Contract Vulnerabilities (and Fixes)
In 2024, smart contract vulnerabilities led to over $3.5 billion in losses within the blockchain industry, underscoring the critical importance of comprehensive security audits to protect decentralized finance ecosystems
Metana EditorialJuly 15, 2025Read
BlockchainThe Rise of Web3 Memes: A New Way to Communicate in Crypto
TL;DR Web3 memes are internet memes that make complex blockchain and decentralized technology concepts more accessible through humor They've evolved from early jokes about explaining crypto to grandparents into powerful…
Metana EditorialJuly 14, 2025Read
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