Blockchain for beginners:build certificate registration DApp

What we cover

• We briefly cover the philosophy of the blockchain and Ethereum.

• Then we will explain how blockchains work, what is Decentralized App and how smart contract communicates with DApp

• We setup the easy development environment, including tools that can be used with minimum steps

• And the biggest part of the course is dedicated to guiding you through a simple Decentralized App

  
  

Some of the keyword definition:

Blockchain is a growing list of digital pieces of information which are linked using cryptography. It is an open, distributed ledger that can record transactions between two parties efficiently and also in a verifiable and permanent way.

Decentralized applications (dApps) are applications that run on blockchain rather than a database.

Smart contract is defined as pieces of computer code that self-execute when predetermined conditions are fulfilled. The results of the transaction will be written onto a distributed ledger or blockchain.

We covered the following concept:

• Ethereum

• Account

• Gas

• Smart Contract

• Decentralized App

• Blockchain

• Bitcoin

• Solidity

• Web3.js

• Ropsten Testnet

What tools and libraries are used?

• Ethereum

• The Metamask Chrome extension

• The Solidity smart contract language (0.5.0)

• The Web3.js(Web3 1.0.0)

• The Ganache Ethereum node emulator

• Github

• Visual Studio Code (text editor)

• The Ropsten test network

All our codes are stored in Github and the solidity code will be stored as .sol file.

• Lesson 2 unit 1: @hashcademy-> choose certificate_dapp -> choose branch master

• Lesson 2 unit 2: @hashcademy-> choose certificate_dapp -> before modify javascript:  choose branch 1a, after modify javascript: choose branch 2

• Lesson 2 unit 3: @hashcademy-> choose certificate_dapp -> choose branch 3

• Lesson 2 unit 4: @hashcademy-> choose certificate_dapp -> choose branch 4

• Lesson 2 unit 5: @hashcademy-> choose certificate_dapp -> choose branch 5