Udacity Blockchain Nanodegree Program Project - Star Notary Dapp

This is a project that tests our knowledge to write and deploy a decentralized application on an Ethereum test network -- Rinkeby. This Dapp allows you to register and look up a star.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

The following packages are required:

node.js
npm
web3
http-server
openzeppelin-solidity
truffle-hdwallet-provider
ganache-cli

Running the tests

You can clone/fork this repo and install all required packages by running npm install

Go to terminal and start Ganache-cli: ganache-cli --mnemonic ... Please note that I run this command with a flag of mnemonic so I can access the same addressess everytime

In another terminal window, run the truffle test:

cd ~/smart_contracts
truffle test

You should see a similar result as mine:

Deploy smart contract on Rinkeby test network

With all tests passed, we can now deploy this smart contract on a public test network. In this case, we use Rinkeby.

At first, we need to compile the contract using truffle: truffle compile

Secondly, we need to run a deploy command: truffle deploy --network rinkeby

If deployed successfully, you should see a similar result as mine:

In my case, my Star Notary is deployed at

Contract Address: 0xd56eccb93995c35159921044a64683531d85c0d2
Transaction ID: 0x79e39a2001bd4c98b25680cd7f4f0855d8048a6c6083f7582266e2f0134410b3

You can see more details about this contract using Etherscan (Rinkeby version): https://rinkeby.etherscan.io/address/0xd56eccb93995c35159921044a64683531d85c0d2

Interact with the smart contract on Rinkeby

You can interact with this contract using a simple website. In your terminal, start the http-server:

cd <Project folder>
http-server

There are two links, and I personally use the second one:

http://127.0.0.1:8080
http://192.168.1.3:8080

After you open this website on your browser, you should see:

Then you can interact with the website (make sure you log on the Metamask at first!), as shown below:

License

This project is licensed under the MIT License - see the LICENSE file for details