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SavjeeCoin

(★ 1,770)

A simple blockchain in Javascript. For educational purposes only.

파일 탐색기

최종 버전 다운로드 (.zip)

- - ci.yml
- blockchain.js
- keygenerator.js
- main.js
- .eslintrc.js
- block.test.js
- blockchain.test.js
- helpers.js
- transaction.test.js
.eslintrc.js
.gitignore
.npmignore
LICENSE
package-lock.json
package.json
README.md

# 설치 가이드

1. 코드 내려받기

git clone https://github.com/Savjee/SavjeeCoin

깃허브에서 프로젝트 코드 전체를 내 컴퓨터로 내려받습니다.

cd SavjeeCoin

방금 내려받은 프로젝트 폴더 안으로 이동합니다.

2. Node.js

쉬움 추천

사전 준비물

Git GitHub에서 프로젝트 코드를 내려받으려면 필요합니다.
Node.js npm 명령어를 쓰려면 Node.js가 설치되어 있어야 합니다. LTS(장기지원) 버전을 추천합니다.

npm install --save savjeecoin

package.json에 명시된 라이브러리들을 내려받아 설치합니다.

✅ 명령어 실행 후 터미널에 나타나는 주소(보통 http://localhost:3000 형태)를 브라우저에서 열어보세요.

이 레포의 README에 적힌 실제 명령어를 그대로 가져왔습니다.

// repository documentation

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<p align="center">
  <a href="" rel="noopener">
 <img width=200px height=200px src="https://i.imgur.com/VELRxXl.png" alt="Project logo"></a>
</p>

<h3 align="center">SavjeeCoin</h3>

<div align="center">

[![.github/workflows/ci.yml](https://github.com/Savjee/SavjeeCoin/actions/workflows/ci.yml/badge.svg)](https://github.com/Savjee/SavjeeCoin/actions/workflows/ci.yml)
  [![Coverage Status](https://coveralls.io/repos/github/Savjee/SavjeeCoin/badge.svg?branch=master)](https://coveralls.io/github/Savjee/SavjeeCoin?branch=master)
  [![GitHub Issues](https://img.shields.io/github/issues/Savjee/SavjeeCoin.svg)](https://github.com/Savjee/SavjeeCoin/issues)
  [![GitHub Pull Requests](https://img.shields.io/github/issues-pr/Savjee/SavjeeCoin.svg)](https://github.com/Savjee/SavjeeCoin/pulls)
  [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/Savjee/SavjeeCoin/master/LICENSE)

</div>

---

*⚠️ For education purposes only. This is by no means a complete implementation and it is by no means secure!*

## Features

* Simple proof-of-work algorithm
* Verify blockchain (to prevent tampering)
* Generate wallet (private/public key)
* Sign transactions

## 🏁 Getting Started <a name = "getting_started"></a>

### Install library
```
npm install --save savjeecoin
```

### Generate a keypair
To make transactions on this blockchain you need a keypair. The public key becomes your wallet address and the private key is used to sign transactions.

```js
const EC = require('elliptic').ec;
const ec = new EC('secp256k1');

const myKey = ec.genKeyPair();
```

The `myKey` object now contains your public & private key:

```js
console.log('Public key:', myKey.getPublic('hex'));
console.log('Private key:', myKey.getPrivate('hex'));
```

### Create a blockchain instance
Now you can create a new instance of a Blockchain:

```js
const {Blockchain, Transaction} = require('savjeecoin');

const myChain = new Blockchain();
```

### Adding transactions
```js
// Transfer 100 coins from my wallet to "toAddress"
const tx = new Transaction(myKey.getPublic('hex'), 'toAddress', 100);
tx.sign(myKey);

myChain.addTransaction(tx);
```

To finalize this transaction, we have to mine a new block. We give this method our wallet address because we will receive a mining reward:

```js
myChain.minePendingTransactions(myKey.getPublic('hex'));
```

---

## 📽 Video tutorial
This source code comes from [my video series on YouTube](https://www.youtube.com/watch?v=zVqczFZr124&list=PLzvRQMJ9HDiTqZmbtFisdXFxul5k0F-Q4). You can check them here:

| Video 1: Simple implementation | Video 2: Adding Proof-of-work |
:-------------------------:|:-------------------------:
[![](https://img.youtube.com/vi/zVqczFZr124/maxresdefault.jpg)](https://www.youtube.com/watch?v=zVqczFZr124) | [![](https://img.youtube.com/vi/HneatE69814/maxresdefault.jpg)](https://www.youtube.com/watch?v=HneatE69814)
| Video 3: Mining rewards & transactions | Video 4: Signing transactions |
[![](https://img.youtube.com/vi/fRV6cGXVQ4I/maxresdefault.jpg)](https://www.youtube.com/watch?v=fRV6cGXVQ4I) | [![](https://img.youtube.com/vi/kWQ84S13-hw/maxresdefault.jpg)](https://www.youtube.com/watch?v=kWQ84S13-hw)
| Video 5: Building a front-end in Angular
[![](https://img.youtube.com/vi/AQV0WNpE_3g/maxresdefault.jpg)](https://www.youtube.com/watch?v=AQV0WNpE_3g) |