Verifiable Credentials, a new terminology proposed by W3C, is one of the main building blocks of the Self-sovereign Identity Ecosystem. This article will provide an explanation of its definition and mechanism. Physical credentials The term credentials are not so unfamiliar. In fact, physical credentials have become an inseparable aspect of our daily…

A few years ago, Progressive Web App (PWA) was considered the “revolution” in the technology world, especially e-commerce, by providing a strong mix of traditional websites and native mobile apps, serving all devices with a single solution. …

The introduction to Bitcoin Bitcoin is a decentralized digital currency created in 2009 by the mysterious and pseudonymous Satoshi Nakamoto. Until now, the identity of the person (or persons) who created the technology is still a mystery. Bitcoin is known as a type of cryptocurrency because it uses cryptography to keep it secure. There…

Web 3 has several intriguing features for developers to investigate, particularly its distributed storage capability, which is based on the development of blockchain technology. Data saved on blockchains, however, must be pre-processed before being usable for dApp, which takes time and resources. …

The introduction to Blockchain ETL produced a high-level overview of what ETL is, why ETL is needed on Blockchain, and the Blockchain ETL architecture. In this post, I’m going to dig deep into ETL on some typical blockchain networks, such as Bitcoin and Ethereum. …

Flow is a fast, high-performance, and scalable layer-1 blockchain explicitly designed for the new generation of crypto games, Dapps, and digital assets. Flow aims to serve billions of users with fast, low-cost transactions and a good user experience by introducing multi-node architecture and its own resource-oriented smart contract language-Cadence. In…

Zk-rollup is a rollup-based technology that has gone viral in the blockchain world. It helps the system optimize security and reduce costs and transaction time by manipulating and compressing layer2. What are ZK-Rollups?

Rollups technology has gradually become popular in the blockchain with its application. To be more specific, it helps the system optimize security and reduce transaction costs by performing manipulation and compression at layer2. What are Rollups? Rollups move computation (and state storage) off-chain but keep some data for each on-chain transaction. To improve…

What is a DAO? A DAO — Decentralized Autonomous Organization is an organization model in which decentralization and autonomy are emphasized as key factors of the system. This concept was first mentioned in the blockchain community by Vitalik Buterin as Decentralized Autonomous Corporation in 2013 [1], and later DAO. …