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Preface Quick Glossary 1．What Is Ethereum? Compared to Bitcoin Components ofa Blockchain The Birth of Ethereum Ethereum's Four Stages of Development Ethereum： A General-Purpose Blockchain Ethereum's Components Further Reading Ethereum and Turing Completeness Turing Completeness as a “Feature” Implications of Turing Completeness From General-Purpose Blockchains to Decentralized Applications （DApps） The Third Age ofthe Internet Ethereum's Development Culture Why Learn Ethereuml What This Book Will Teach You 2．Ethereum Basics Ether Currency Units Choosing an Ethereum Wallet Control and Responsibility Getting Started with MetaMask Creating a Wallet Switching Networks Getting Some Test Ether Sending Ether from MetaMask Exploring the Transaction History ofan Address Introducing the World Computer Externally Owned Accounts （EOAs） and Contracts A Simple Contract： A Test Ether Faucet Compiling the Faucet Contract Creating the Contract on the Blockchain Interacting with the Contract Viewing the Contract Address in a Block Explorer Funding the Contract Withdrawing from Our Contract Conclusions 3．Ethereum Clients Ethereum Networks Should I Run a Full Node? Full Node Advantages and Disadvantages Public Testnet Advantages and Disadvantages Local Blockchain Simulation Advantages and Disadvantages Running an Ethereum Client Hardware Requirements for a Full Node Software Requirements for Building and Running a Client （Node） Parity Go-Ethereum（Geth） The First Synchronization of Ethereum-Based Blockchains Running Geth or Parity The JSON-RPC Interface Remote Ethereum Clients Mobile Smartphone） Wallets Browser Wallets Conclusions …… 4．Cryptography 5．Wallets 6．Transactions 7．Smart Contracts and Solidity 8．Smart Contracts and Vyper 9．Smart Contract Security 10．Tokens 11．Oracles 12．Decentralized Applications DApps） 13．The Ethereum VirtuaIMachine 14．Consensus A．Ethereum Fork History B．Ethereum Standards C．Ethereum EVM Opcodes and Gas Consumption D．Development Tools， Frameworks， and Libraries E．web3．js Tutorial F．Short Links Reference Index