Book Image

Blockchain Developer's Guide

By : Brenn Hill, Samanyu Chopra, Paul Valencourt, Narayan Prusty
Book Image

Blockchain Developer's Guide

By: Brenn Hill, Samanyu Chopra, Paul Valencourt, Narayan Prusty

Overview of this book

Blockchain applications provide a single-shared ledger to eliminate trust issues involving multiple stakeholders. It is the main technical innovation of Bitcoin, where it serves as the public ledger for Bitcoin transactions. Blockchain Developer's Guide takes you through the electrifying world of blockchain technology. It begins with the basic design of a blockchain and elaborates concepts, such as Initial Coin Offerings (ICOs), tokens, smart contracts, and other related terminologies. You will then explore the components of Ethereum, such as Ether tokens, transactions, and smart contracts that you need to build simple DApps. Blockchain Developer's Guide also explains why you must specifically use Solidity for Ethereum-based projects and lets you explore different blockchains with easy-to-follow examples. You will learn a wide range of concepts - beginning with cryptography in cryptocurrencies and including ether security, mining, and smart contracts. You will learn how to use web sockets and various API services for Ethereum. By the end of this Learning Path, you will be able to build efficient decentralized applications. This Learning Path includes content from the following Packt products: • Blockchain Quick Reference by Brenn Hill, Samanyu Chopra, Paul Valencourt • Building Blockchain Projects by Narayan Prusty
Table of Contents (37 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Index

Principles of security


Cryptography safeguards the three principles of information security, which can be remembered by the mnemonic device Central Intelligence Agency (CIA):

  • Confidentiality: Ensures that information is shared with the appropriate parties and that sensitive information (for example, medical information, some financialdata) is sharedexclusively with the consent of appropriate parties.

  • Integrity: Ensures that only authorized parties can change dataand (depending on the application) that the changes made do not threaten the accuracy or authenticity of the data.This principle is arguably the most relevant to blockchains in general, and especially the public blockchains.

  • Availability: Ensures authorizedusers (for example, holders of tokens) have the use of data or resources when they need or want them.The distributed and decentralized nature of blockchain helps with this greatly.

The relevance to blockchainand cryptocurrencyis immediately evident:if,for instance,a blockchain did...