[:us: | English | 영어] [:kr: | Korean | 한국어]

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onechain

Assist in developing blockchain core efficiently.

2018 OSS Grand Developers Challenge Award
2019 OSS Grand Developers Challenge Award

Inspired by lhartikk/naivechain.

Live Demo

Run onechain on Ainize! You can access the live onechain with the endpoint provided by Ainize, a serverless platform for open-source projects. For example, you can see all blocks in blockchain with a /blocks GET request (i.e. HERE) .

onechain-explorer

Click on the above image to go to the onechain-explorer repo.

A onechain explorer is the front-end used to visualize the state of the blockchain. This blockchain explorer allows users to see the latest blocks and details about a particular block. onechain already has multiple functions with HTTP (RESTful API) endpoints. So the web page calls those endpoints and visualizes the results.

The full UI code is located in lukepark327/onechain-explorer repo. Vue.js and Vuetify are used.

Abstract

As Blockchain-based services grew, so open-source that assists in developing blockchain core was needed. There are open-source projects like Bitcoin and Ethereum, but those are too hard to learn and to use.

We solve the above problems with a onechain, simple implementation of blockchain core. The onechain adopts modular design: Dividing layers into blockchain, network, APIs, and wallet for clarity. Also, detailed comments and documents are provided to facilitate learning and reusing. Both front-end and back-end of onechain is written in Javascript (Node.js and Vue.js) but written in simple (without async, et al.) so that other language developers can understand them.

Use-cases

📖 컴퓨터과학으로 배우는 블록체인 원리와 구현

• Chapter-1
• Chapter-2
• Chapter-3
• Chapter-4

Click on the above image to go to the bookstore.

Governance Simulator on Blockchain : Based on Smart City Cases

• Paper

Blockchain Policy Simulator

• BBR Hackathon Excellence Award
• Video Demonstration
• Code

edu-chain

• Code

Plasma DAG

• Code

Docker Quick Start

docker run -it -p 3001:3001 -p 6001:6001 lukepark327/onechain

How to Start

Environments

• Node.js v8.11.3
• cURL 7.55.1 or Postman v6.4.4

Install dependencies

npm install

Run Nodes

Start node #1

npm start

Start node #2

• Set HTTP_PORT for HTTP communication

  $env:HTTP_PORT=3002 or export HTTP_PORT=3002

• Set P2P_PORT for P2P communication among peers

  $env:P2P_PORT=6002 or export P2P_PORT=6002

• (option) Set pre-connected PEERS before running

  $env:PEERS="ws://127.0.0.1:6001[, ws://127.0.0.1:6003, ...]" or export PEERS="ws://127.0.0.1:6001[, ws://127.0.0.1:6003, ...]"

• (option) Set PRIVATE_KEY where private_key is located

  $env:PRIVATE_KEY="second" or export PRIVATE_KEY="second"

  Now private_key is located in ./wallet/second/ instead of default location ./wallet/default/.

npm start

How to Use

Click on the above image to play the video.

Get blockchain

curl http://127.0.0.1:3001/blocks

Use 'pretty-print JSON' for better readability:

curl http://127.0.0.1:3001/blocks | python -m json.tool

Python >= 2.6 is required.

Get a particular block

curl http://127.0.0.1:3001/block/:number

For example, let us get a block whose number (index) is 3:

curl http://127.0.0.1:3001/block/3

Add new block

curl -X POST http://127.0.0.1:3001/mineBlock
curl -H "Content-type:application/json" --data "{\"data\" : [\"Anything you want\", \"Anything you need\"]}" http://127.0.0.1:3001/mineBlock

Get current version

curl http://127.0.0.1:3001/version

Get the version of particular block

curl http://127.0.0.1:3001/blockVersion/:number

For example, let's get a version of a block whose number (index) is 3:

curl http://127.0.0.1:3001/blockVersion/3

Get connected peer(s)

curl http://127.0.0.1:3001/peers

Add peer(s)

curl -H "Content-type:application/json" --data "{\"peers\" : [\"ws://127.0.0.1:6002\", \"ws://127.0.0.1:6003\"]}" http://127.0.0.1:3001/addPeers

Get Address

curl http://127.0.0.1:3001/address

Stop

curl -X POST http://127.0.0.1:3001/stop

License

The onechain project is licensed under the Apache License, Version 2.0, also included in our repository in the LICENSE file.