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 (10 chapters)

Building a Wallet Service

A wallet service is used to send and receive funds. Major challenges for building a wallet service are security and trust. Users must feel that their funds are secure and the administrator of the wallet service doesn't steal their funds. The wallet service we will build in this chapter will tackle both these issues.

In this chapter, we'll cover the following topics:

  • Difference between online and offline wallets
  • Using hooked-web3-provider and ethereumjs-tx to make it easier to create and sign transactions using accounts not managed by an Ethereum node
  • Understanding what a HD wallet is and also its uses
  • Creating an HD wallet and a transaction signer using lightwallet.js
  • Building a wallet service