Technology is constantly evolving and blockchain is taking development to new places as
mobile did a decade ago - and Ethereum is the leading platform for creating this new wave of
applications. This book reveals everything you need to create a robust decentralized
application (more commonly known as DApp). Unlike other books on the topic this one focuses on
the web application layer and guides you in creating great experiences on top of the Ethereum
blockchain. You'll review the challenges and differences involved in developing DApps as
opposed to traditional web applications. After a brief introduction to blockchain history and
Ethereum in particular you'll jump directly into building a sample decentralized application
to familiarize yourself with all the moving pieces. This book offers specific chapters on
querying and rendering data from the blockchain reacting to events interacting with user
accounts sending transactions managing gas handling confirmations and reorganizations and
more. You will also find a chapter dedicated to Solidity that will give you the necessary means
to understand and even build your own smart contracts. Other important topics covered include
building backend servers that act as indexing layers and managing storage efficiently with
solutions like the interplanetary file system or IPFS. Last but not least you will find
chapters that examine the biggest problems on Ethereum today: onboarding and scalability. These
include the state of the art of the available strategies to tackle them such as
meta-transactions smart accounts ENS state channels sidechains and more. What You'll Learn
Connect to the blockchain from the browser and send transactions from client-side Build a web
app that provides a read-only interface to a blockchain contract Create a wallet interface for
arbitrary fungible tokens displaying the user's balance and allowing for simple transfers to
other addresses Develop a web app that stores large blobs of data off-chain and keeps a
reference to it on-chain (e.g. avatars long text descriptions) Produce a web app that relies
on a centralized server for indexing on-chain information to be presented to the user Who This
Book Is ForWeb developers focused on client-side applications with knowledge of JavaScript and
HTML CSS. You do not need any prior knowledge of Blockchain Ethereum or cryptocurrency.
