Web3

Introduction I created a Japanese tutorial for ethers.js, a JavaScript library for Ethereum. https://github.com/nakamura196/ethers-ja-tutorial It is also published as a static site using VitePress. https://nakamura196.github.io/ethers-ja-tutorial/ Background ethers.js is one of the most widely used libraries in Ethereum development. Japanese articles about v6 were mostly focused on migration guides from v5, and there was no systematic tutorial for beginners to learn from scratch. Since the official documentation is only available in English, I created a tutorial that allows learners to study the basics step by step in Japanese. ...

This article summarizes the pitfalls and solutions when using the group feature with Pinata’s Files API v3. Background There are cases where you want to manage files uploaded to Pinata by groups and retrieve only files belonging to a specific group. For example, storing input images used in an NFT registration form in an “input” group and allowing image selection only from that group. Pitfalls 1. Legacy API and V3 API File Management Are Separate Problem: Files uploaded with the legacy API (pinFileToIPFS) cannot be retrieved with the V3 API (/v3/files). The reverse is also true. ...

Notice: 2025-06-14 Development progress is summarized here. https://zenn.dev/nakamura196/books/41693d2d017082 Overview Starting with the following article, I have been prototyping a digital cultural heritage management system using blockchain. This time, I modified the system so that uploaded data is recognized as NFTs. This is a learning process, so there may be incomplete aspects, but I hope it serves as a helpful reference. Usage Page The file upload method remains the same as before. A link to the detail page was added to the list page displayed after upload. ...

Notice: 2025-06-14 The development progress is summarized at the following link. https://zenn.dev/nakamura196/books/41693d2d017082 Overview As part of learning blockchain technology, I created a prototype management system for digital cultural heritage. Since the purpose is learning blockchain, there are many missing features, but I plan to add and improve them in the future. https://digital-heritage-five.vercel.app/ Technologies Used The Ethereum Sepolia network is used. Since the purpose is blockchain learning and prototype development, a test network is used. Pinata is used as the hosting service for the distributed file storage IPFS. https://pinata.cloud/ ...