공공 네트워크나 허락이 필요없는 블록체인은 누구나 네트워크에 참여할 수 있지만, permissioned network에서는 오직 권한이 있는 노드들만 특정 활동(e.g. validate blocks)이 가능함.예를 들어서 private network나 규제를 받는 데이

이 튜토리얼에서는 consensus model에 관한 기본 개념과 블록체인 네트워크를 시작하는 법에 대해서 다룬다. 모든 블록체인들은 노드를 필요로 한다. 노드들은 메세지의 집합체를 동의하고 새로운 블록을 성공적으로 생성하는데 쓰임(하나의 블록이 다음 블록으로 넘어가

튜토리얼 목표 substrate node를 설계하고 실행하는 기본 패턴들을 익히기 Custom FRAME pallet을 작성하고 나의 runtime에 통합하기 storage items를 생성하고 업데이트 하는 법 pallet extrinsics 와 helper func

이하의 과정은 유저의 os가 ubuntu 혹은 debian WSL2임을 가정합니다.sudo apt update && sudo apt install -y git clang curl libssl-dev llvm libudev-devrustupcurl https:/

Data types Every values in rust have a certain date type. For example, when we convert string type to number type , we must add type annotation(: typ

As mentioned already, Variable is immutable by default in Rust.If you want mutable variable, you can use 'mut' keyword.This code will cause error if t

Let's break this code line by line.use std::io;To get user input and give output, we need use 'io'(input/output)'io' comes from standart library 'std'

Start Rust Make a boilerplate In your terminal , Type this command line cargo new caculator and you can check boilerplate in your project file. (na

uint : unsigned interger, you can give bit size to type like 'uint8' , 'uint256'. uint only can handle non-negative interger.boolstring : utf-8 encode

Solidity Introduction License // SPDX-License-Identifier: GPL-3.0 This line means this code is licensed under the GPL (for open source, use MIT) Pra

Decentralized (Think about robin hood and game stop issue)Blockchain is Transparent & Flexible (Everyone can see records and Everyone follow same rule

Manual Testing : Writing code preview and test in browser (still error-prone because it is hard to test all scenarios).Automated Testing : Testing wit

Redux is definitely strong and cool tool to manage actions and state.However, you may want to keep your code more indepedently.we can replace redux wi

If we use CSS animation effect, we always have elements related to style on browser. The animiation may be pretty fine though.Sure, we can figure out

Authentication with React Auth process client -> requetst permission (with user credentials) -> server If clidential accepted, server -> response (s

In real word example, There is lots of routes in web page which is handled by Server. Of course, we should show different visual content of each paths

Advanced Redux Side Effects, Async Tasks with Redux Originally, Redux reducer functions is pure, side-effect free, synchronous. Then Where should si

Redux is a state management system for cross-component or app-wide state.There is three kind of states.Local state : a state belongs to a single compo

Forms & User input in detail What makes form complex? Forms and inputs can assume different states(one or more inputs are invalid vs All inputs are

With custom hooks, you can extract component logic and reuse it as a function.When we build app, There will be duplicated logic definitely. This is th