Build CryptoStar Dapp on Ethereum

This project is build cryptostar dapp that implements a star notary smart contract, where the information about people's favorite stars in the sky can be managed by means of the blockchain.

Token Info

• ERC-721 token name : "Star Token"

• ERC-721 token symbol : "STR"

• Contract Address in Rinkeby Network : 0x3e5DC2e7377DBf7e010C0A2bbe80a9f255259212

     Replacing 'StarNotary'
     ----------------------
     > transaction hash:    0x161712d01f4965e5b62b8b46ec2462dea22180aec53aec2061174ef99dde0584
     > Blocks: 0            Seconds: 6
     > contract address:    0x3e5DC2e7377DBf7e010C0A2bbe80a9f255259212
     > block number:        4783950
     > block timestamp:     1563889164
     > account:             0xF09c02c1cA4B098B2ADA2669A22142d8baF44f88
     > balance:             18.652191792
     > gas used:            2329966
     > gas price:           10 gwei
     > value sent:          0 ETH
     > total cost:          0.02329966 ETH
  

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Prerequisites

To install the software, you need to doownload the following:

1. Install Node.js on your computer.
2. Clone or download the repository to your local computer.
3. Open the terminal and install the packages: npm install

If you want deploy the smart contract to Rinkeby network, you need to the following:

1. The Metamask's backup phrase is required.
2. Infura Project ID

Installing

The procedure to obtain development environment:

npm install --save truffle-hdwallet-provider
npm install --save openzeppelin-solidity

Run the truffle develope. Truffle Develop started at http://127.0.0.1:9545/

And You can get Accounts and Private Keys.

truffle develope

Type compile on truffle(develope) console. This compiles the smart contract.

compile

Deploy the smart contract on the your private network.

migrate --reset

To run the front-end of the Dapp, You have to type following command on New Terminal.

cd app

Start the webpack-dev-server Project is running at http://localhost:8080/

npm run dev

Open that url in your browser to access the front-end of the Dapp.

Deploy the Smart Contract to Rinkeby Network

If you want deploy the smart contract to Rinkeby network, you need to the following:

• You have to type your infura Project ID to const infuraKey = {Infura POJECT ID} in truffle-config.js file.
• Type Metamask's backup phrase to const mnemonic = {METAMASK SEED} in truffle-config.js file.
• Type truffle migrate —reset —network rinkeby on the terminal.

Running the tests

Explain how to run the automated tests for this system.

• You can run the unit test smart contract by test command on truffle console.

truffle(develop)> test
Using network 'develop'.


Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.



  ✓ can Create a Star (107ms)
  ✓ lets user1 put up their star for sale (145ms)
  ✓ lets user1 get the funds after the sale (202ms)
  ✓ lets user2 buy a star, if it is put up for sale (202ms)
  ✓ lets user2 buy a star and decreases its balance in ether (146ms)
  ✓ can add the star name and star symbol properly (87ms)
  ✓ lets 2 users exchange stars (179ms)
  ✓ lets a user transfer a star (122ms)
  ✓ lookUptokenIdToStarInfo test (74ms)

  9 passing (1s)

Built With

• Node.js - The JavaScript used.
• Truffle v5.0.26 - A development framework for Ethereum.
• openzeppelin-solidity v2.1.2 - Library for secure smart contract development.

Author

• Mingu Kang - Github