On June 21, the notorious JaredFromSubway.eth MEV sandwich bot was exploited by an attacker who leveraged the bot’s own automated token‑approval logic, draining over $7.55 million in WETH, USDC and USDT through a multi‑stage scheme involving fake tokens, deceptive liquidity pools, and a transferFrom call.
Oracles serve as the crucial bridge that enables smart contracts to access off‑chain data, and while they are the dominant solution for real‑time on‑chain updates, the article also explores alternative approaches such as centralized data entry, state channels, sidechains, and cross‑chain oracles, outlining their pros, cons, and challenges.
This guide walks you through cloning the Uniswap V3 core repository, setting up the development environment, compiling Solidity contracts, and executing the comprehensive test suite to deeply understand the protocol's core mathematics and logic.
This guide explains why compiling third‑party contracts from node_modules fails and shows a robust method to deploy precompiled artifacts directly using Hardhat and ethers.js, with step‑by‑step code examples for UniswapV3Factory.
Explore the intricate architecture of Uniswap V3 by dissecting its core contracts—v3-core and v3-periphery—covering factories, pools, callbacks, interface definitions, state variables, and practical learning steps, revealing how its modular design underpins modern DeFi security and flexibility.
Learn how to streamline Ethereum smart contract debugging by using Hardhat’s interactive console, covering setup, querying chain state, interacting with deployed contracts, reading and writing functions, and advanced features like manual mining, all with practical code examples to boost development efficiency.
This guide explains Hardhat Ignition's declarative deployment model, compares it with traditional imperative scripts, and provides a detailed line‑by‑line walkthrough of a sample Lock module, including code snippets, visual flow, and best‑practice conclusions for Ethereum developers.
Etherscan offers three powerful features—Decompile Bytecode, Opcodes View, and Similar Contracts—that let developers and security researchers translate compiled contract bytecode back into readable code, inspect low‑level instructions, and locate related contracts on the blockchain, enhancing transparency and auditability.
This article breaks down the technical foundations of DeFi, explaining how smart contracts enable decentralized exchanges, comparing order‑book and automated market‑maker architectures, and detailing supporting components such as oracles, stablecoins, and lending protocols with concrete examples and formulas.
This guide breaks down Ethereum gas mechanics, explains the calculation formula, walks through a step‑by‑step example converting Remix gas numbers to USD, and offers practical tips for developers to optimize contract costs.
This article walks through a typical Hardhat test run, explaining each section of the console report—from compilation details and individual test results to gas usage, network configuration, and deployment costs—so developers can assess contract correctness, performance, and optimization opportunities.
Running a decentralized exchange requires extensive pre‑launch development, rigorous security audits, robust front‑end design, tokenomics planning, and continuous post‑launch operations such as infrastructure maintenance, security monitoring, liquidity management, and community governance.
This guide explains why syncing a full testnet is unnecessary for beginners and shows how to use local development networks with frameworks like Hardhat and Truffle to quickly compile, debug, and test Ethereum smart contracts on a personal computer.
This article walks you through a real DeFi transaction on Etherscan, explaining each field, event log, and the underlying smart‑contract interactions so you can confidently interpret blockchain activity without feeling overwhelmed.
This article explores how PHP, with its ease of use, rich libraries, and strong community support, can be leveraged for blockchain development, covering its unique advantages, practical application scenarios, essential technical concepts, framework choices, and future prospects for creating decentralized, secure, and efficient applications.
The article examines how the shift from centralized Web2.0 to decentralized Web3.0 creates major architectural challenges—data scattering, smart‑contract security, high concurrency, and cross‑chain interoperability—and proposes technical solutions such as distributed storage, consistency algorithms, code auditing, caching, load balancing, and cross‑chain standards.
This article explains how REVM, a Rust‑based, modular Ethereum Virtual Machine implementation, enables developers to create custom EVMs—such as Optimism‑compatible chains—by leveraging the EvmWiring trait, zero‑cost abstractions, and extensible design without forking the core protocol.
This article provides a comprehensive overview of Ethereum, explaining what it is, how its external and contract accounts work, the mechanics of transactions and gas, the underlying network architecture, major client implementations, and how Hardhat facilitates smart‑contract development.
The 2024 IEEE‑OPPO Pan‑Terminal Security Forum, held on March 29 at Xi'an Jiaotong University, gathers leading researchers to discuss AI, IoT, blockchain, and smart contract security, presenting cutting‑edge threats, defense strategies, and future technical capabilities for intelligent terminal products.
This article examines the rapid rise of Web3 phishing, detailing various attack vectors such as transaction‑based phishing, eth_sign blind signing, modal phishing, approval abuse, address‑poisoning, and zero‑transfer tricks, while presenting detection methods and Ant Group’s multi‑dimensional anti‑money‑laundering platform as a countermeasure.
This article provides a detailed forensic analysis of a Flashbots MEV bot attack on Ethereum, describing the underlying PBS protocol flaw, the malicious validator’s multi‑stage preparation, the sandwich‑style exploit, the financial impact, and recommended code‑level fixes to prevent private transaction leakage.
This article explains what Web3 is, its historical context compared with Web 1.0 and Web 2.0, outlines the emerging Web3 technology stack, discusses current challenges and applications, and provides guidance for developers who want to start building decentralized applications.
This article examines how a blockchain‑based platform built by ICBC and the Huangshan Rural Property Rights Trading Center modernizes rural land and asset transactions in China, addressing information asymmetry, fund supervision, and digitization challenges while delivering win‑win benefits for farmers, governments, and banks.
Understanding a Web 3.0 DApp’s architecture involves replacing the centralized database and backend of a Web 2.0 stack with Ethereum’s immutable blockchain and smart contracts, while the front‑end communicates via providers, uses off‑chain storage like IPFS, queries through events or The Graph, scales with Layer 2 solutions, and leverages tools such as Hardhat, Truffle, and Remix.
The article traces the evolution from the read‑only Web 1.0 through the interactive Web 2.0 to the decentralized, user‑owned Web 3.0, explaining key concepts such as blockchain, smart contracts, NFTs, and the broader significance of decentralization for the future internet.
The article explains Web3’s trust‑less model and smart‑contract fundamentals—from Bitcoin’s simple script to Ethereum’s gas‑metered EVM—examines design trade‑offs such as on‑chain versus signature‑based whitelists, outlines engineering practices for immutable bytecode upgrades, and describes consensus evolution from PoW to a hybrid PoS/PoA PBFT “High‑Energy Chain.”
This comprehensive guide walks beginners through the evolution from Web 1.0 to Web 3.0, explains blockchain fundamentals, gas fees, smart contracts, crypto wallets, and provides step‑by‑step instructions for setting up a secure wallet and launching a decentralized application.
This guide explains what a DAO is, why it matters, and provides a step‑by‑step roadmap—including naming, mission statements, community platforms, and the essential smart‑contract and token tools—to successfully create and run a decentralized autonomous organization.
This article examines data usage control and multi‑party secure computation, covering relevant Chinese policies, the technical mechanisms such as computing contracts and blockchain integration, and future directions for regulatory digitization and standardization, while emphasizing trust, auditability, and privacy preservation.
This article introduces Web 3.0 concepts, explains blockchain architecture and Ethereum fundamentals, then walks through creating an ERC‑20 HPC token, setting up a Geth client, writing and deploying Solidity contracts, and building a MetaMask‑enabled front‑end deployed on IPFS.
This guide outlines a step‑by‑step Web3.0 learning path covering fundamental computer science, frontend and backend web skills, decentralized application (DApp) concepts, smart‑contract development, and essential tools, enabling newcomers to become competent blockchain developers.
This article explains what non‑fungible tokens (NFTs) are, how blockchain and Bitcoin work, the role of Ethereum and ERC‑721 smart contracts, and explores practical uses of NFTs in both digital and physical contexts.
This article provides an overview of Web3, tracing its origins, contrasting it with Web1.0 and Web2.0, describing its decentralized architecture and development stack, and offering guidance for newcomers on tools, smart‑contract languages, and practical resources.
This article explains what NFTs are, how they differ from fungible assets, the underlying blockchain technology including Bitcoin and Ethereum, the mechanics of mining and consensus, and demonstrates the ERC‑721 smart‑contract interface that enables non‑fungible tokens.
This comprehensive guide walks developers from essential computer‑science fundamentals through front‑end basics, Solidity programming, and DApp construction, offering curated resources and step‑by‑step instructions to become proficient in Web3 and blockchain development within a year.
This article explains what NFTs are, how non‑fungible tokens differ from fungible assets, the underlying blockchain technology including Bitcoin and Ethereum, and demonstrates the ERC‑721 smart‑contract interface that enables unique digital ownership.
This article offers a beginner-friendly overview of blockchain technology, covering the origins of Bitcoin, the Ethereum platform, smart contracts, oracles, and decentralized applications, while explaining how decentralized networks provide transparency, freedom, and security compared to traditional financial systems.
This article explains how blockchain technology can speed up payment processing, simplify receipt handling, enable self‑executing smart contracts, cut transaction fees, and strengthen security, thereby transforming the payment landscape for online retailers.
This article explores EOS as a leading Blockchain 3.0 platform, detailing its layered architecture, consensus mechanisms, resource management model, account system, smart contract framework, and how Suning leverages EOS for a scalable distributed data storage solution.
This article analyzes the technical design, deployment options, data handling, governance, and future direction of the ZhiXin blockchain platform, illustrating how it ensures immutable evidence storage, smart‑contract execution, cross‑chain transactions, and compliance within a consortium environment.
The article reviews JD’s recent blockchain technology salon, detailing JD Chain and BDS products, their enterprise applications in smart supply chain, retail, finance, and electronic contracts, and outlines the platform’s architecture, performance, open‑source strategy, and future integration with cloud and AI.
The article explains blockchain as a decentralized, tamper‑proof distributed ledger built from a peer‑to‑peer network, block structure, consensus, cryptography and smart contracts, outlines its evolution from information to value internet, classifies public, consortium and private chains, and details Tencent Cloud’s BaaS platform, Zhixin Chain evidence services, and various technical solutions and use‑cases such as data integrity, supply‑chain traceability and asset tokenization.
Blockchain combines peer‑to‑peer networking, cryptographic hashing, consensus and smart contracts to create immutable, traceable, shared ledgers, classified as public, consortium or private chains, enabling trustless value transfer and tokenized assets across banking, judicial and supply‑chain applications, with Tencent Cloud providing tailored solutions that support China’s national strategy for efficient, low‑cost asset highways.
This article examines how Tencent, China NetSec, and Beiming Software built the ZhiXinChain blockchain platform to create immutable digital evidence for copyright protection, detailing the technology, workflow, benefits, and future possibilities for the content industry.
This article presents a comprehensive overview of blockchain technology, its strategic importance in China, its technical fundamentals, and how its features such as multi‑party maintenance, immutability, and smart contracts can be applied to improve transparency, efficiency, and trust in public‑welfare platforms, especially in the post‑COVID‑19 era.
The article examines the shared and divergent aspects of blockchain and databases, outlining three ideal blockchain scenarios, comparing transaction management, consensus algorithms, and programming paradigms, and exploring performance, multi-version control, and future integration possibilities between the two technologies.
This article outlines multiple Ethereum RPC attack techniques—including unlock‑account hijacking, miner‑address manipulation, brute‑force, offline, and zero‑fee attacks—provides detailed attack flow diagrams, code‑path references, recent honeypot statistics, and practical defense measures to secure RPC endpoints.
This tutorial explains blockchain fundamentals, its decentralized and tamper‑proof nature, and walks through a complete Java implementation—including block structure, hash calculation, mining, validation, and testing—while also covering advanced topics such as consensus algorithms, transaction verification, node types, real‑world applications, and essential development tools.
This article explains the fundamental concepts of blockchain, outlines its three-layer architecture (protocol, extension, application), reviews typical language‑specific implementations, and presents a knowledge‑map that helps developers systematically study and build blockchain‑based products.
This article provides a comprehensive overview of blockchain technology, covering its fundamental concepts, layered architecture (protocol, extension, and application layers), implementation details across various programming languages, and a knowledge map to help developers understand and build blockchain-based products.
This article explores blockchain programming fundamentals, compares public and permissioned chains, reviews major development platforms, and evaluates the top five languages—C++, JavaScript, Python, Go, and Solidity—highlighting their strengths, weaknesses, and real‑world blockchain applications.
This article introduces the rapid rise of blockchain technology beyond cryptocurrencies, explains smart contracts, and presents ten widely used tools—including Remix IDE, Solidity compiler, Solium, Parity, Geth, MetaMask, Truffle, and DAppBoard—plus additional resources, helping developers choose the right solutions for their projects.
This article provides a comprehensive overview of blockchain technology, explaining its structure, cryptographic foundations, and how Bitcoin and Ethereum operate, including mining, transaction processes, smart contracts, and ICOs, while also highlighting regulatory concerns and common misconceptions.
This article explains the fundamentals of blockchain technology, the structure of blocks, Bitcoin mining and transaction processes, the evolution to Ethereum with smart contracts, and the concept and regulatory concerns of ICOs, providing a comprehensive overview for newcomers to the crypto space.
This article explains how JD's ZRobot leverages alliance‑chain blockchain to address leasing business challenges such as breach disputes by providing real‑time, immutable evidence, legal endorsement, and secure data storage, while outlining the broader regulatory and industry context in China.
This tutorial walks you through installing geth, synchronizing the Rinkeby testnet, creating accounts, writing and compiling Solidity contracts, deploying an ERC20 token, and performing common operations such as balance queries, transfers, approvals, and delegated transfers using the console and web3.js.
The article presents Ctrip’s Blockchain Service Platform (CBaaS), detailing its motivation, architecture, and the advantages of using Hyperledger Fabric’s modular design—including contract execution, consensus, permission control, and multi‑chain capabilities—to simplify enterprise blockchain adoption and enable secure, data‑rich on‑chain applications.
This article outlines the three evolutionary stages of blockchain architecture—1.0 focusing on digital currency, 2.0 introducing smart contracts with Ethereum, and 3.0 expanding to enterprise‑wide applications—highlighting key components, consensus mechanisms, and the shift toward industry‑specific solutions.
This article proposes a consortium blockchain solution for financial risk data sharing that records query transactions as token‑based entries, enables post‑audit and reversal mechanisms, defines a multi‑type token settlement system, and discusses institution onboarding and future evaluation capabilities.
In this InfoQ interview, seasoned front‑end engineer CSS Magic explains how his ten‑year web background led him to explore decentralized applications, compares DApp architecture with traditional web apps, outlines blockchain’s unique traits, public‑chain selection criteria, required skills, and offers career advice for developers considering the blockchain wave.
A comprehensive reference of Ethereum development resources covering programming languages, frameworks, IDEs, client implementations, storage solutions, messaging protocols, wallets, explorers, gas calculators, services, testnets, contract libraries, testing utilities, security tools, learning material, governance platforms, and key documentation.
The article analyzes the shortcomings of current seller‑driven financial risk data sharing, proposes a blockchain consortium architecture using Hyperledger Fabric, compares a 1.0 token‑based design with an improved 2.0 version that adds a service layer, secure multi‑party computation, and regulatory oversight to achieve fair pricing, data quality, security, and efficient transaction processing.
This article proposes a blockchain-based alliance for financial risk data sharing, detailing the post‑transaction accounting and audit mechanisms, token‑based settlement processes, various transaction types, and the scalability considerations for onboarding new institutions, aiming to improve data quality, pricing fairness, and ecosystem governance.
The article analyses the shortcomings of traditional seller‑driven financial risk data queries and proposes a blockchain consortium that uses distributed ledger, consensus, smart contracts and token‑based pricing to enable fair, secure, and efficient data sharing and settlement among financial institutions.
This article compares Java and Solidity constructor concepts, shows how Solidity constructors were defined before and after version 0.4.22, demonstrates the required syntax changes with code examples, and explains the compilation warnings and errors that arise from version mismatches.
When compiling a Solidity contract in Remix, the “mock compiler: source not found” error occurs because the compiler version isn’t specified, and the guide shows how to set the correct version in Remix settings or directly via the URL, plus tips for spotting low‑level syntax mistakes.
This guide explains why Remix shows two typical Solidity compiler warnings—missing visibility and missing pure mutability—and demonstrates step‑by‑step code modifications that remove both warnings while clarifying function visibility and state‑mutability modifiers.
This article explains Ethereum's core modules, transaction flow, account and UTXO models, state storage using Merkle‑Patricia tries, synchronization modes, and details Meitu's delegated proof‑of‑stake (DPoS) design, including its additional global state trees and practical deployment considerations.
An engaging dialogue explains blockchain fundamentals, the problems it addresses, its cross‑industry impact, and the core technical concepts such as peer‑to‑peer networks, cryptography, hashing, and Merkle trees, providing a clear overview for developers and enthusiasts alike.
This article analyzes the US‑submitted blockchain reference architecture, outlines its six‑layer design, and offers practical guidance for domestic blockchain architects on infrastructure, security, data services, ledger, development tools, and interoperability.
This article explains how integrating Intel SGX's trusted execution environment with blockchain smart contracts enhances data confidentiality, enables complex computations, and addresses privacy and scalability challenges in decentralized data exchange for various applications.
The article introduces blockchain fundamentals for programmers, covering asymmetric cryptography, public ledgers, double‑spending, transaction ordering, consensus mechanisms, proof‑of‑work mining, smart contracts, gas, token transfers, zero‑knowledge proofs, and self‑regulation, while relating each concept to familiar software engineering patterns.
The article argues that blockchain, merely a tamper‑evident transaction log, cannot solve real‑world problems because it does not ensure accurate data entry or trust, as illustrated by failed supply‑chain pilots and risky smart contracts, ultimately likening the technology to a “crypto‑medieval” illusion.
This article explains why more enterprises are adopting blockchain, outlines its core advantages such as immutable distributed ledgers and smart contracts, and presents four practical ways—BaaS, public platforms, open‑source deployments, and custom protocols—for companies to experiment with the technology.
This article clarifies that blockchain smart contracts are neither traditional contracts nor inherently smart, explains transaction fundamentals, explores how platforms like Ethereum enable programmable conditions, and examines the security, confidentiality, integrity, and availability challenges they introduce.
This article explains common Solidity vulnerabilities—including overflow, underflow, function visibility pitfalls, delegatecall misuse, and reentrancy attacks—illustrates each issue with concrete code examples, and shows how to mitigate them using SafeMath and proper contract design.
This article explains blockchain fundamentals and demonstrates a Java implementation, covering block structure, immutability, hashing, Merkle trees, transaction handling, proof‑of‑work mining, and unit tests with complete code examples.
This step‑by‑step guide shows how to set up a local development environment, write and deploy Solidity smart contracts with Truffle, configure MetaMask, and create a JavaScript front‑end to launch a functional pet‑shop DApp on an Ethereum private chain.
This article explains how blockchain, as a decentralized and trust‑less ledger, enables digital identity, tokenized assets, smart contracts, automated governance, and streamlined settlement across sectors such as finance, government, and healthcare, while also discussing its challenges and future potential.
This article explains the core technical concepts of blockchain—including encrypted data relationships, immutability, peer-to-peer networks, blocks, mining, consensus mechanisms, Merkle trees—and discusses suitable and unsuitable use cases, typical applications such as Bitcoin and Ethereum, and practical considerations for developers.
Smart contracts are decentralized programs stored on a blockchain that automatically enforce “if‑then” clauses, offering transparent, trustless computation for scenarios like automated bank payments, code‑based legal agreements, and token transfers, while highlighting platform differences, cost trade‑offs, and the emerging need for legally‑savvy programmers.
The article argues that automatic formal verification of Ethereum smart contracts using deep learning and Hoare Logic is fundamentally impossible because pre‑ and post‑conditions must be manually specified, and it further critiques the overall concept of smart contracts as an overengineered and unnecessary feature of blockchain systems.
This article explains blockchain as a distributed peer‑to‑peer ledger, its origins with Bitcoin, key protocols like Ethereum and Ripple, how blocks are linked and secured, real‑world uses such as Maersk’s shipping solution, and the distinction between public and private blockchains.
The article examines the TON blockchain whitepaper authored by Nikolai Durov, highlighting its multi‑chain architecture that can support billions of distinct tokens, its smart‑contract‑driven subscription model, and how it compares to other platforms like EOS in terms of performance and scalability.
This article presents a first‑principles framework that categorizes blockchain infrastructure components—storage, computation, and communication—by mapping them to concrete projects such as Ethereum, IPFS, BigchainDB, and others, illustrating how these modules interoperate to build efficient decentralized applications.
This article explains blockchain fundamentals, clears common misconceptions, describes its basic components, outlines the technology’s evolution from 1.0 to 3.0, and highlights current and future application scenarios across various industries.
This article demystifies blockchain by explaining its fundamental structure of linked blocks, how hashes ensure integrity, the differences between public and private blockchains, and illustrates smart contract use cases such as automated rent payments, providing clear examples and visual diagrams for beginners.
This article examines blockchain's core mechanisms, its influence on system architecture—including tight coupling, security, privacy, and consensus challenges—and presents China Merchants Bank's practical implementation of a blockchain‑based cross‑border clearing system.
This article introduces the fundamentals of blockchain technology, explaining how blocks and hashes form an immutable chain, contrasts public and private blockchains with real‑world examples like Bitcoin and smart‑contract scenarios, and provides simple pseudocode illustrating how such contracts could be executed.
This article explains blockchain fundamentals, its core features like distributed ledgers and data authentication, and explores practical applications such as crowdfunding, smart contracts, supply‑chain management, decentralized cloud storage, fast secure payments, and IoT device connectivity.
This article explains the fundamentals of blockchain technology, its key features such as decentralization, smart contracts, and security, examines its advantages and drawbacks, and explores practical applications and challenges of implementing blockchain solutions in the tourism sector, including ticketing, ride‑hailing, and hotel reservations.
This comprehensive guide explains blockchain fundamentals, its core technologies such as blocks, hash functions, Merkle trees, consensus mechanisms and smart contracts, and explores diverse industry applications—from digital currencies and finance to supply‑chain, healthcare and IP—while also offering investment insights and future outlooks.
This article explores blockchain fundamentals, its classification, core mechanisms such as decentralization, public‑key cryptography and consensus, examines how blockchain reshapes system architecture and introduces challenges like security, privacy, and smart‑contract legality, and details China Merchants Bank’s practical implementation of a blockchain‑based cross‑border clearing platform.
This guide explains Ethereum’s native and token unit hierarchy, shows how to convert between wei, gwei, ether and other denominations using geth console and Web3.js functions such as toDecimal, fromDecimal, toBigNumber, fromWei, toWei, and demonstrates sending transactions and querying balances.
This article explains the fundamentals of blockchain technology, compares centralized and distributed systems with simple analogies, and details how Bitcoin and Ethereum operate, including their advantages, limitations, and the role of smart contracts and gas in decentralized applications.
This guide explains Ethereum's account types, how transactions and internal messages work, the role of gas and gas limits, fee calculation, and how network congestion can lead to DoS‑like conditions, providing a practical foundation for developers.
This article explains blockchain fundamentals, compares its distributed ledger to everyday examples like group chats, discusses how it solves trust crises, outlines the 1.0‑3.0 evolution stages, and explores emerging applications in finance, loyalty programs, voting, energy grids, and ride‑sharing.
This guide explains how to write Ethereum smart contracts in Solidity, Serpent, or LLL, compile them to bytecode, generate Java wrappers with Web3j, manage transactions and events, use filters, and operate the Web3j command‑line tool for wallet and contract tasks.
This article compares Ethereum Wallet (Mist) and Geth, outlining their graphical versus command‑line interfaces, supported operating systems, main features such as account creation, token exchange, smart‑contract deployment, and API access, helping developers choose the appropriate client for building blockchain applications.
This article examines the rise of Bitcoin and Ethereum, their underlying blockchain technology, market valuations, mining mechanisms, and potential to transform electronic payments and financial systems, while also outlining the broader industry implications and future challenges.
