This guide explains why accessing on‑chain data directly is the most trustless method, outlines the steps to query a Uniswap V3 ETH/USDC pool using Web3.py, provides full Python code, and offers practical tips for extending the approach to other pools and historical data.
This guide shows beginners how to explore contract details on the Sepolia testnet using Etherscan's read‑only interface and then how to programmatically retrieve the same data with a Node.js script that leverages Web3.js, covering setup, code examples, and next‑step possibilities.
This tutorial introduces the Flow blockchain, its unique sharding architecture, and ecosystem, then walks through installing the Flow CLI, using the Cadence Playground, writing and deploying a HelloWorld smart contract, and extending it with additional functions and scripts.
The article reviews the rapid rise of Web3, outlines the severe security challenges and economic losses caused by attacks on cross‑chain bridges, DeFi platforms, and smart contracts, and details Ant Group's Sky Dome Lab research on platform, contract, and client‑side defenses along with future AI‑driven initiatives.
This article walks through setting up a local Ethereum testnet using Ganache, configuring a Java project with Web3j, and implementing code to query the network and perform a signed Ether transfer, providing step-by-step instructions, code snippets, and screenshots for beginners.
This guide walks you through understanding blockchain contracts, setting up a React‑Vite‑Tailwind front‑end, installing ethers and Hardhat, writing and testing a Solidity contract, configuring Hardhat, deploying to Goerli via Alchemy, and integrating the contract with a React application.
This study investigates the capability of ChatGPT, a large language model, to detect common smart‑contract vulnerabilities, evaluates its performance against traditional tools across multiple datasets, and discusses its strengths, limitations, and future potential in blockchain security auditing.
The guide walks readers through Web3’s evolution from Web1.0 to blockchain‑driven Web3.0, explains core concepts such as decentralized ledgers, smart contracts, gas fees and consensus, then details DApp architecture and provides a step‑by‑step tutorial building a pet‑adoption DApp with Solidity, Truffle, MetaMask and a Vue/React frontend.
A bug in the AkuDreams 3D‑animation NFT auction smart contract locked 11,539.5 ETH (worth about $34 million) and prevented refunds, prompting the developer foobar and the project team to investigate, disclose two contract errors, and eventually offer a partial 0.5 ETH refund to affected bidders.
A critical logic mistake and a refund‑queue vulnerability in the Akutar NFT project's AkuDreams Solidity contract caused 11,539 ETH (about $34 million) to become permanently locked, illustrating how subtle coding errors can freeze massive crypto assets.
The article explains the so‑called “jaeden” flaw in the ERC‑20 approve function, illustrates how transaction ordering can lead to double‑spending attacks, and offers two practical mitigation strategies for developers to write safer token contracts.
This guide walks you through every step of learning Hyperledger Fabric—from setting up the environment and deploying single‑ and multi‑node networks to developing, installing, and testing chaincode with Java SDK—providing a hands‑on roadmap for blockchain developers.
This tutorial walks you through the complete process of setting up a local Ethereum node, developing and deploying a Solidity token contract with Truffle, generating Java wrappers using Web3j, and integrating the contract into an Android app to perform transfers and balance queries.
This tutorial walks through creating a decentralized voting application on Ethereum using Solidity contracts, Ganache for local blockchain simulation, Web3.js for RPC interaction, and Truffle for compilation, migration, and front‑end integration, covering setup, contract code, deployment, and both console and web UI interactions.
This article presents a concise, ten‑item glossary of essential blockchain concepts—from decentralization and mining pools to cryptocurrencies, Bitcoin, Ethereum, smart contracts, proof‑of‑work, and the foundational blockchain itself—providing clear definitions and context for each term.
This article presents a series of Hyperledger Fabric chaincode examples written in Go, covering information notarization, asset trading, digital currency issuance, diploma verification, community energy sharing, and logistics supply chain, each with functional descriptions, key functions, data models, and REST‑API interaction details.
