{"id":39018,"date":"2019-10-31T22:27:25","date_gmt":"2019-10-31T19:27:25","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kniga-sozdanie-smart-kontraktov-solidity-dlya-blokchejna-ethereum-prakticheskoe-rukovodstvo\/"},"modified":"2019-10-31T22:27:25","modified_gmt":"2019-10-31T19:27:25","slug":"kniga-sozdanie-smart-kontraktov-solidity-dlya-blokchejna-ethereum-prakticheskoe-rukovodstvo","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/kniga-sozdanie-smart-kontraktov-solidity-dlya-blokchejna-ethereum-prakticheskoe-rukovodstvo","title":{"rendered":"The book \"Creating Smart Contracts with Solidity for the Ethereum Blockchain: A Practical Guide\"","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"The
\nFor over a year, I worked on the book \u201cCreating Solidity Smart Contracts for the Ethereum Blockchain: A Practical Guide,\u201d and now this work is complete, and the book has been published and is available on LitRes<\/a><\/noindex>.<\/p>\n

I hope my book will assist in quickly getting started with Solidity smart contracts and DApp development for the Ethereum blockchain. It consists of 12 lessons with practical tasks. By completing them, readers will be able to set up their own local Ethereum nodes, deploy smart contracts, call their methods, and exchange data between the real world and smart contracts using oracles, while also working with the Rinkeby test debugging network. <\/p>\n

The book is aimed at everyone interested in advanced blockchain technologies who wants to quickly acquire the knowledge necessary for engaging in exciting and promising work.<\/p>\n

Below you will find the table of contents and the first chapter of the book (also on LitRes<\/a><\/noindex> fragments of the book are available). I hope to receive feedback, comments, and suggestions. I will consider all of this while preparing the next edition of the book.
\n<\/a><\/noindex>
\nTable of Contents<\/b>Introduction<\/b>Our book is intended for those who want not only to understand the principles of the Ethereum blockchain but also to gain practical skills in developing DApps using the Solidity programming language for this network.<\/p>\n

It's better to work with this book rather than just read it, completing the practical tasks described in the lessons. You will need a local computer, a virtual or cloud server with Debian or Ubuntu OS installed. Many tasks can also be performed on a Raspberry Pi.<\/p>\n

In the first lesson <\/b>we will explore the principles of the Ethereum blockchain and the main terminology, as well as discuss where this blockchain can be used. <\/p>\n

The goal the second lesson<\/b> is to create a node of a private Ethereum blockchain for further work in this course on an Ubuntu and Debian server. We will examine the features of installing essential utilities, such as geth, which enables the operation of our blockchain node, as well as the decentralized data storage daemon swarm.<\/p>\n

The third lesson<\/b> will teach you how to experiment with Ethereum on a low-cost Raspberry Pi microcomputer. You will install the Rasberian operating system (OS) on your Raspberry Pi, the Geth utility that allows for blockchain node operation, and the Swarm decentralized storage daemon.<\/p>\n

Lesson Four<\/b> is dedicated to accounts and cryptocurrency units on the Ethereum network, as well as methods for transferring funds from one account to another using the Geth console. You will learn how to create accounts, initiate fund transfer transactions, check the state of transactions, and obtain their receipts.<\/p>\n

In Lesson Five<\/b> you will get acquainted with smart contracts on the Ethereum network and learn how they are executed by the Ethereum virtual machine. <\/p>\n

You will create and publish your first smart contract in a private Ethereum network and learn how to call its functions. For this, you will use the Remix Solidity IDE development environment. Additionally, you will learn how to install and use the solc batch compiler.
\nWe will also discuss the so-called Application Binary Interface (ABI) and teach you how to use it.<\/p>\n

Lesson Six<\/b> is dedicated to creating JavaScript scripts that run under Node.js and perform operations with Solidity smart contracts.<\/p>\n

You will install Node.js on Ubuntu, Debian, and Rasberian, write scripts to publish smart contracts on a local Ethereum network and call their functions. <\/p>\n

Moreover, you will learn how to transfer funds between regular accounts and deposit them into smart contract accounts using scripts.<\/p>\n

In Lesson Seven<\/b> you will learn how to install and use the popular Truffle Integrated Development Environment (IDE) among smart contract developers. You will create JavaScript scripts that call contract functions using the truffle-contract module and test your smart contract with Truffle tools.<\/p>\n

Lesson Eight<\/b> is dedicated to Solidity data types. You will write smart contracts that work with data types such as signed and unsigned integers, signed numbers, strings, addresses, complex type variables, arrays, enumerations, structures, and dictionaries.<\/p>\n

In Lesson Nine<\/b> You will take another step toward creating smart contracts for the Ethereum mainnet. You will learn to deploy contracts using Truffle in a private Geth network, as well as in the Rinkeby test network. Debugging a smart contract in the Rinkeby network is very useful before its deployment to the mainnet\u2014everything there is almost real, but for free.<\/p>\n

In this lesson, you will create a Rinkeby test network node, fund it, and deploy a smart contract.<\/p>\n

Lesson 10<\/b> is dedicated to distributed data storage in Ethereum Swarm. By using distributed storage, you save on storing large volumes of data in the Ethereum blockchain. <\/p>\n

In this lesson, you will create a local Swarm storage, perform read and write operations for files and directories. Next, you will learn to work with the public Swarm gateway, write scripts to access Swarm from Node.js, and use the Perl module Net::Ethereum::Swarm.<\/p>\n

The goal of Lesson 11<\/b> is to master working with Solidity smart contracts using the popular programming language Python and the Web3.py framework. You will install this framework, write scripts for compiling and deploying a smart contract, as well as for calling its functions. During this, Web3.py will be used both independently and in conjunction with the integrated development environment Truffle.<\/p>\n

In Lesson 12<\/b> you will learn to pass data between smart contracts and the real world using oracles. This will be useful for retrieving data from websites, IoT devices, various instruments and sensors, and for sending data from smart contracts to these devices. In the practical part of the lesson, you will create an oracle and a smart contract that obtains the current exchange rate of USD to rubles from the Central Bank of Russia's website.<\/p>\n

Lesson 1. A Brief Overview of Blockchain and the Ethereum Network<\/b>The goal of the lesson:<\/b> to familiarize yourself with the principles of how the Ethereum blockchain works, its areas of application, and key terminology.
\nPractical tasks:<\/b> none are provided in this lesson.<\/p>\n

Today, it is hard to find a software developer who has not heard of blockchain technology, cryptocurrencies, Bitcoin, initial coin offerings (ICO), smart contracts, and other concepts and terms related to blockchain.<\/p>\n

Blockchain technology opens up new markets and creates job opportunities for programmers. If you master all the intricacies of cryptocurrency technologies and smart contracts, you should have no trouble applying this knowledge in practice.<\/p>\n

It should be noted that there are many speculations surrounding cryptocurrencies and blockchains. We will set aside discussions about the fluctuations in cryptocurrency prices, pyramid schemes, the nuances of cryptocurrency legislation, etc. In our course, we will mainly focus on the technical aspects of applying smart contracts on the Ethereum blockchain and developing so-called decentralized applications (DApps).<\/p>\n

What is Blockchain<\/h3>\n

\nBlockchain is a chain of data blocks that are interconnected in a specific way. At the beginning of the chain is the first block, known as the genesis block.<\/p>\n

All these data blocks are automatically replicated across numerous nodes in the blockchain network. This ensures decentralized storage of blockchain data.
\nYou can think of a blockchain system as a large number of nodes (physical or virtual servers) connected in a network, replicating every change in the chain of data blocks. It's like a giant multi-server computer, where the nodes of such a computer (servers) can be scattered all over the world. And you can also add your computer to the blockchain network. <\/p>\n

Distributed Database<\/h4>\n

\nBlockchain can be seen as a distributed database replicated across all nodes in the blockchain network. In theory, the blockchain will continue to function as long as at least one node is operational, storing all blockchain blocks.<\/p>\n

Distributed Ledger of Data<\/h4>\n

\nBlockchain can be viewed as a distributed ledger of data and transactions. Another name for such a ledger is a ledger book. <\/p>\n

In a distributed ledger, data can be added but cannot be modified or deleted. This impossibility is achieved, in particular, through the use of cryptographic algorithms, special algorithms for adding blocks to the chain, and decentralized data storage.<\/p>\n

When adding blocks and performing operations (transactions), private and public keys are used. They restrict blockchain users, providing them access only to their data blocks.<\/p>\n

Transactions<\/h4>\n

\nBlockchain stores information about operations (transactions) in blocks. Old, completed transactions cannot be rolled back or changed. New transactions are stored in newly added blocks.<\/p>\n

Thus, the entire transaction history can be recorded in an immutable form on the blockchain. Therefore, blockchain can be used, for example, for secure storage of banking operations, copyright information, and the history of property ownership changes.<\/p>\n

The Ethereum blockchain contains so-called system states. As transactions are executed, the state changes from initial to current. Transactions are recorded in blocks.<\/p>\n

Public and private blockchains<\/h4>\n

\nIt should be noted that all that has been said applies only to so-called public blockchain networks, which cannot be controlled by any individual or legal entities, government bodies, or authorities.
\nSo-called private blockchain networks are under the complete control of their creators, and everything is possible there, such as completely replacing all blocks in the chain.<\/p>\n

Practical applications of blockchain<\/h4>\n

\nWhat can blockchain be useful for?<\/p>\n

In short, blockchain allows secure transactions (deals) to be conducted between parties or companies that do not trust each other. Data recorded on the blockchain (transactions, personal data, documents, certificates, contracts, invoices, etc.) cannot be forged or replaced after being recorded. Therefore, trusted distributed ledgers of various types of documents can be created based on blockchain.<\/p>\n

Of course, you know that cryptocurrency systems are built on blockchain technology, aiming to replace conventional paper money. Paper money is also referred to as fiat (from Fiat Money).
\nBlockchain ensures the storage and immutability of transactions recorded in blocks, which is why it can be used to create cryptocurrency systems. It contains the entire history of cryptocurrency transfers between various users (accounts), and any operation can be traced.<\/p>\n

Although transactions within cryptocurrency systems can be anonymous, converting cryptocurrency to fiat money usually results in the disclosure of the cryptocurrency asset owner's identity. <\/p>\n

So-called smart contracts, which are software running on the Ethereum network, allow the automation of deal-making processes and the monitoring of their execution. This is especially effective when payment for a transaction is made using the Ether cryptocurrency.<\/p>\n

The Ethereum blockchain and Ethereum smart contracts, written in the Solidity programming language, can be used, for example, in the following areas:<\/p>\n