Category: Ethereum

Ethereum – Ganache for Blockchain Ganache is used for setting up a personal Ethereum Blockchain for testing your Solidity contracts. It provides more features when compared to Remix. You will learn about the features when you work out with Ganache. Before you begin using Ganache, you must first download and install the Blockchain on your local machine. Downloading Ganache You may download Ganache from the following URL − Ganache is available on several platforms. We developed and tested this entire tutorial on Mac. Thus, the screenshots below will show Mac installation. When you open the installation URL given above, it automatically detects your machine’s OS and directs you to the appropriate binary installation. The screenshot below shows the Mac installation. When you click on the DOWNLOAD button, it will begin downloading the DMG file for Mac installation. Installing Ganache Locate the “Ganache-2.0.0.dmg” in your Downloads folder and double-click on it to install Ganache. Upon successful installation, the following screen will appear − Drag Ganache icon to the Application folder. Now, Ganache is available as an application on your Mac. If you are using some other OS, follow the instructions provided for successful installation. Starting Ganache Now locate Ganache in your Application folder and double-click on its icon to start Ganache. Ganache Desktop When Ganache starts, the Ganache screen will appear as shown below − Click QUICKSTART to start Ganache. You will see Ganache console as shown below − The console in the above screenshot shows two user accounts with balance of 100 ETH (Ether – a currency for transaction on Ethereum platform). It also shows a transaction count of zero for each account. As the user has not performed any transactions so far, this count is obviously zero. We will now get an overview of a few important screens of Ganache that are of immediate relevance to us.

Ethereum – Smart Contracts There are several tools available to develop and test contracts. One of the simplest tools is provided on the official Ethereum site itself. The tool is called Remix, we will use this for our contract development. Remix for Contract Development Open the Remix IDE by typing in the following URL in your browser. The following screen will appear. In the center window, you will see some default code, which is a sample Solidity code. You will type your contract code in this code editor. Your code may be auto-compiled. Upon successful compilation of the code, you will be able to run the code in the same IDE. When you execute the contract methods, the results will be displayed in the same IDE window. There are facilities to debug the code and to unit test your project. These can be seen in the menu bar at the top right hand side as shown in the IDE screenshot below. You will be using these options shortly. You will now start writing your contract.