DevSecOps engineer sharing experiences and insights on AI, Web3, and Claude code development. Aims to help solve technical challenges, improve development efficiency, and grow through community interaction. Feel free to comment and discuss.
This article explains how to create a RAG‑based intelligent QA system that fetches the latest documentation (e.g., PlantUML) before querying Gemini, detailing knowledge‑base creation, embedding, vector store management, LangChain integration, and deployment tips.
This article explains why Ethereum can seemingly generate unlimited addresses by detailing the 160‑bit address space (2^160 possibilities), comparing its size to real‑world quantities, describing the local cryptographic generation process, the on‑demand activation model, and why address collisions are practically impossible.
This article explains the cryptographic mechanisms—ECDSA, secp256k1 elliptic curve operations, and Keccak‑256 hashing—that make Ethereum addresses one‑way functions, ensuring that deriving a private key from a public address is computationally infeasible.
This article explains the fundamentals of Cross‑Site Scripting attacks, illustrates reflected, stored, and DOM‑based variants with concrete code examples, and presents a four‑step defense strategy—including input validation, output encoding, Content Security Policy, and WAF—to protect web applications.
This step‑by‑step guide explains how to safely export a MetaMask private key, import it into the Clef signing tool for a local private Ethereum chain, and execute transactions while emphasizing critical security warnings and best‑practice precautions.
This guide walks through setting up a private Ethereum network, configuring Geth with the external signer Clef, and safely moving funds from a funded genesis account to a Clef‑managed address while demonstrating each command, approval step, and verification of balances.
This guide walks you through connecting to a private Ethereum node with geth, using eth.getBalance to retrieve an account's balance, and converting the scientific notation 1e+21 Wei into a readable Ether amount, while explaining the underlying concepts and useful shortcuts.
This tutorial walks developers through installing Geth, crafting a genesis.json file, initializing a private Ethereum chain, launching the node with custom parameters, and interacting via the console, providing a fast, cost‑free environment for smart‑contract testing.
This article explains how a MetaMask wallet address, built on the Ethereum 0x format, can be used across many EVM‑compatible blockchains, receive different versions of USDT, and move assets via cross‑chain bridges, effectively acting as a universal digital passport.
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.
