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