Book Image

Building Blockchain Projects

By : Narayan Prusty
Book Image

Building Blockchain Projects

By: Narayan Prusty

Overview of this book

Blockchain is a decentralized ledger that maintains a continuously growing list of data records that are secured from tampering and revision. Every user is allowed to connect to the network, send new transactions to it, verify transactions, and create new blocks, making it permission-less. This book will teach you what blockchain is, how it maintains data integrity, and how to create real-world blockchain projects using Ethereum. With interesting real-world projects, you will learn how to write smart contracts which run exactly as programmed without any chance of fraud, censorship, or third-party interference, and build end-to-e applications for blockchain. You will learn about concepts such as cryptography in cryptocurrencies, ether security, mining, smart contracts, solidity, and more. You will also learn about web sockets, various API services for Ethereum, and much more. The blockchain is the main technical innovation of bitcoin, where it serves as the public ledger for bitcoin transactions.
Table of Contents (16 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Building the betting contract


In our betting application, two people can choose to bet on a football match with one person supporting the home team and the other person supporting the away team. They both should bet the same amount of money, and the winner takes all the money. If the match is a draw, then they both will take back their money.

We will use the FastestLiveScores API to find out the result of matches. It provides a free API, which lets us make 100 requests per hour for free. First, go ahead and create an account and then generate an API key. To create an account, visit https://customer.fastestlivescores.com/register, and once the account is created, you will have the API key visible at https://customer.fastestlivescores.com/. You can find the API documentation at https://docs.crowdscores.com/.

For every bet between two people in our application, a betting contract will be deployed. The contract will contain the match ID retrieved from the FastestLiveScores API, the amount of wei...