Book Image

Ethereum Cookbook

By : Manoj P R
Book Image

Ethereum Cookbook

By: Manoj P R

Overview of this book

Ethereum and Blockchain will change the way software is built for business transactions. Most industries have been looking to leverage these new technologies to gain efficiencies and create new business models and opportunities. The Ethereum Cookbook covers various solutions such as setting up Ethereum, writing smart contracts, and creating tokens, among others. You’ll learn about the security vulnerabilities, along with other protocols of Ethereum. Once you have understood the basics, you’ll move on to exploring various design decisions and tips to make your application scalable and secure. In addition to this, you’ll work with various Ethereum packages such as Truffle, Web3, and Ganache. By the end of this book, you’ll have comprehensively grasped the Ethereum principles and ecosystem.
Table of Contents (13 chapters)

Fetching data from APIs using solidity

Ethereum virtual machine (EVM), by design, cannot read data from the outside world. This restricts achieving certain functionalities in Ethereum blockchain. Since every node runs every calculation, it’s not efficient to make arbitrary network requests from an Ethereum contract.

We can overcome this limitation with the help of oracles. These allow a smart contract to read data from an external source in an intelligent way. In this recipe, you will learn to create an Oracle service and read data from an external API.

Getting ready

You need to have a working Ethereum installation for deploying and testing the smart contract. You can also use the Remix IDE to write and test the solidity...