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Building Blockchain Projects

You're reading from Building Blockchain Projects

Product type Book

Published in Apr 2017

Publisher Packt

ISBN-13 9781787122147

Pages 266 pages

Edition 1st Edition

Languages

Concepts

Author (1):

Narayan Prusty

Table of Contents (16) Chapters

Title Page

Credits

About the Author

About the Reviewers

www.PacktPub.com

Customer Feedback

Preface

1. Understanding Decentralized Applications

2. Understanding How Ethereum Works

3. Writing Smart Contracts

4. Getting Started with web3.js

5. Building a Wallet Service

6. Building a Smart Contract Deployment Platform

7. Building a Betting App

8. Building Enterprise Level Smart Contracts

9. Building a Consortium Blockchain

Introduction to Oraclize

Oraclize is a service that aims to enable smart contracts to access data from other blockchains and the World Wide Web. This service is currently live on bitcoin and Ethereum's testnet and mainnet. What makes Oraclize so special is that you don't need to trust it because it provides proof of authenticity of all data it provides to smart contracts.

In this chapter, our aim is to learn how Ethereum smart contracts can use the Oraclize service to fetch data from the World Wide Web.

How does it work?

Let's look at the process by which an Ethereum smart contract can fetch data from other blockchains and the World Wide Web using Oraclize.

To fetch data that exists outside of the Ethereum blockchain, an Ethereum smart contract needs to send a query to Oraclize, mentioning the data source (representing where to fetch the data from) and the input for the data source (representing what to fetch).

Sending a query to Oraclize Oraclize means sending a contract call (that is, an internal...

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Authors (1)

Narayan Prusty

Narayan Prusty is a full-stack developer. He works as a consultant for various start-ups around the world. He has worked on various technologies and programming languages but is very passionate about JavaScript, WordPress, Ethereum, Solr, React, Cordova, MongoDB, and AWS. Apart from consulting for various start-ups, he also runs a blog titled QNimate and a video tutorial site titled QScutter, where he shares information about a lot of the technologies he works on.

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