Blockchain Essentials: Core Concepts and Implementations

✍ Scribed by Ramchandra Sharad Mangrulkar, Pallavi Vijay Chavan

• Publisher: Apress
• Year: 2024
• Tongue: English
• Leaves: 277
• Category: Library

✦ Synopsis

This book will teach you the core concepts of blockchain technology in a concise manner through straightforward, concrete examples using a range of programming languages, including Python and Solidity. The 50 programs presented in this book are all you need to gain a firm understanding of blockchain and how to implement it.

The book begins with an introduction to the fundamentals of blockchain technology, followed by a review of its types, framework, applications and challenges. Moving ahead, you will learn basic blockchain programming with hash functions, authentication code, and Merkle trees. You will then dive into the basics of bitcoin, including wallets, digital keys, transactions, digital signatures, and more. This is followed by a crash course on Ethereum programming, its network, and ecosystem. As you progress through the book, you will also learn about Hyperledger and put your newly-gained knowledge to work through case studies and example applications.

After reading this book, you will understand blockchain’s underlying concepts and its common implementations.

What You Will Learn

Master theoretical and practical implementations of various blockchain components using Python
Implement hashing, Merkel trees, and smart contracts using the Solidity programming language for various applications
Grasp the internal structure of EVM and its implementation in smart contracts
Understand why blockchain plays an essential role in cryptocurrencies and identify possible applications beyond cryptocurrencies
Investigate and apply alternative blockchain solutions using Hyperledger, including its integration and deployment
Explore research opportunities through case studies and gain an overview of implementation using various languages

Who Is This Book For:

Anyone who is new to blockchain and wants to gain an an understanding of how it works and can be implemented.

✦ Table of Contents

Contents
About the Authors
About the Technical Reviewer
Preface
Acknowledgements
1 Introduction to Blockchain
1.1 Prerequisites
1.2 Blockchain Myths
1.3 Blockchain and Decentralization
1.4 What Is Blockchain?
1.5 Disruptive Technology
1.6 History
1.6.1 Milestones in Blockchain Development
1.7 Features of Blockchain
1.8 Present Growth
1.9 Predicted Market
1.10 Blockchain Types
1.10.1 Public
Characteristics of Public Blockchain
Examples of Public Blockchain
1.10.2 Private
Characteristics of Private Blockchain
Examples of Private Blockchain
1.10.3 Federated
Characteristics of Federated Blockchain
Examples of Federated Blockchain
1.10.4 Hybrid
Characteristics of Hybrid Blockchain
Examples of Hybrid Blockchain
1.10.5 Difference Between Public and Private Blockchains
1.11 Blockchain Framework
1.11.1 Hardware/Infrastructure Layer
1.11.2 Data Layer
1.11.3 Network Layer
1.11.4 Consensus Layer
1.11.5 Application and Presentation Layer
1.12 A Block and Its Structure
1.12.1 A Block
1.12.2 Block Structure
1.12.3 Ledger
1.12.4 Distributed
1.12.5 Transparency
1.12.6 Confirmation
1.12.7 Proof of Work
1.12.8 Block Awards
1.12.9 Transactions and UTXOs
Examples
Nodes
1.12.10 Consensus
1.12.10.1 Types of Consensus
1.13 Scaling Blockchain
1.13.1 Issues in Scaling
1.13.2 Off-Chain Computation
1.13.3 Sharding in Blockchain
1.14 Blockchain DApps and Usecases
1.15 Laboratory Work
1.15.1 Program for Implementing Blockchain in Python
Sample Output
Explanation of Code
1.15.2 Program for Mining a New Block in Blockchain and Printing It
Sample Output
Explanation of Code
1.15.3 Program for Creating Four Blocks in Blockchian and Printing and Traversing
Sample Output
Explanation of Code
1.15.4 Implementing Blockchain and Printing All Fields as per Etherscan.io
Sample Output
Explanation of Code
1.15.5 Implementing Blockchain and UTXo in Python
Sample Output
1.15.6 Explanation of Code
1.15.7 Implementation of PoW Algorithm in Python
Explanation of Code
Sample Output
1.15.8 Implementation of PoS Algorithm in Python
Sample Output
Explanation of Code
1.15.9 Program to Fetch the Latest Block Information from Ethereum Blockchain Using Etherscan API
Sample Input and Output
1.15.10 Explanation of Code
1.16 Summary
1.17 Exercise
1.17.1 Multiple Choice Questions
1.17.2 Short Answer Questions
1.17.3 Long Answer Questions
1.17.4 Practical Questions
1.17.5 Answer Set of MCQ
2 Essentials of Blockchain Programming
2.1 Cryptography Primitives
2.1.1 Hash Function
2.2 Hash Functions
2.2.1 Properties of Hash Functions
2.2.2 Hash Pointers and Data Structures
2.2.3 Tampering Is Computationally Challenging
2.2.4 Role of Hashes in Blockchain
2.2.4.1 Block Validation
2.2.4.2 Digital Signatures and Blockchain
2.3 Secure Hash Algorithm (SHA)
2.3.1 SHA Algorithm
2.3.2 Hashing Patterns
2.4 Public Key Cryptography
2.4.1 Secure Hash Algorithm-3 (Keccak)
2.5 Merkle Tree
2.5.1 Merkle Tree Creation
2.5.2 Role of Merkle Tree in Blockhain
2.5.3 Structure of Merkle Tree
2.5.4 Merkle Proof
2.5.5 Proof of Membership
2.5.6 Proof of Nonmembership
2.5.7 Advantages of Merkle Trees
2.5.8 Applications of Merkle Trees
2.5.9 Merkle Tree Proof of Reserves
2.6 Public Key Cryptography
2.6.1 Public and Private Keys
2.6.2 Public Key Encryption Algorithms
2.6.3 Digitally Signed Transaction
2.6.4 Digital Signing in Blockchain
2.7 Laboratory Work
2.7.1 Program in Python that Demonstrates the Use of Hashlib Library to Generate the SHA-3 Hash of a Message
Explanation of Code
2.7.2 Python Program that Takes a String and the Desired Number of Leading Zeros from the User and Outputs the Input String, the Nonce Value for Which the Leading Zeros Puzzle Is Solved, and the Corresponding Hash Generated
Explanation of Code
Sample Output
2.7.3 Program to Create Hash Code from Given Input String
Explanation of Code
2.7.4 Program in Python that Demonstrates How to Use the SHA-256 Hash Function and Its Application in a Simple Blockchain
Explanation of Code
2.7.5 Write a Program in Python to Verify Hash Properties
Explanation of Code
2.7.6 Program to Demonstrate a Simple Implementation of a Blockchain Using Hash Codes as a Chain of Blocks
Explanation of Code
2.7.7 Program to Demonstrate the Mining Process in Blockchain
Explanation of Code
Sample Output
2.7.8 Program to Create a Merkle Tree in Blockchain
Explanation of Code
2.7.9 Program to Prove Membership and Nonmembership in a Merkle Tree Blockchain
2.7.10 Explanation of Code
2.7.11 Program to Demonstrate How to Prove the Membership and Nonmembership of an Element in a Merkle Tree Blockchain
Explanation of Code
Sample Output
2.7.12 Program in Python that Demonstrates RSA Digital Signature Scheme
Explanation of Code
Sample Output
2.8 Summary
2.9 Exercise
2.9.1 Multiple Choice Questions
2.9.2 Short Answer Questions
2.9.3 Long Answer Questions
2.9.4 Practical Questions
2.9.5 Programming Questions
3 Bitcoin
3.1 What Is Bitcoin
3.2 History
3.3 Predicted Market
3.4 Wallet
Public Keys as Identities
3.4.1 Bitcoin Wallets
3.4.2 Custodial Wallet
3.4.3 Noncustodial Wallet
3.4.4 Software Wallet
3.4.5 Hardware Wallet
3.4.6 Features of Digital Wallet
3.4.7 Difference Between Digital Wallet and Bank Accounts
3.4.8 Top Digital Wallet
3.5 Digital Keys and Addresses
3.5.1 Private Keys
3.5.2 Public Keys
3.6 Addresses in Bitcoin
3.7 Transaction
3.7.1 Transaction Lifecycle
3.7.1.1 Creation and Broadcasting
3.7.1.2 Verification and Inclusion
3.7.2 Creating Transactions
3.7.3 Broadcasting Transactions to the Bitcoin Network
3.7.4 Propagating Transactions on the Bitcoin Network
3.7.5 Data Structures for Transaction
3.7.6 Types of Transactions
3.7.6.1 Standard Transaction
3.7.6.2 Multisignature Transaction
3.7.6.3 Segregated Witness (SegWit) Transaction
3.7.6.4 Coinbase Transaction
3.7.6.5 Lock Time–Enabled Transaction
3.7.7 Transaction Input and Output
3.8 Digital Signature
3.9 Mining and Consensus in Bitcoin
3.9.1 Mining
3.9.2 Consensus
3.9.3 Decentralized Consensus in Bitcoin
3.9.3.1 Peer-to-Peer Network
3.9.3.2 Consensus Mechanism: PoW
3.9.3.3 Blockchain Validation
3.9.3.4 Incentive Mechanisms
3.9.3.5 Fork Resolution
3.9.3.6 Decentralization Benefits
3.9.4 Mining and Racing in Bitcoin
3.9.4.1 Mining Process
3.9.4.2 Race to Solve the Puzzle
3.9.4.3 First Miner's Advantage
3.9.4.4 Block Reward
3.9.4.5 Mining Difficulty Adjustment
3.9.4.6 Continuous Racing
3.9.5 Cost of Mining in Bitcoin
3.9.5.1 Hardware Costs
3.9.5.2 Electricity Costs
3.9.5.3 Cooling and Maintenance Costs
3.9.5.4 Operating Costs
3.9.5.5 Competition and Return on Investment
3.9.5.6 Market Volatility
3.9.6 Consensus Attacks in Bitcoin
3.9.6.1 The Importance of Consensus
3.9.6.2 51% Attack
3.9.6.3 Potential Attack Scenarios
3.9.6.4 Mitigating Consensus Attacks
3.9.6.5 Security Measures
3.10 Forking
3.10.1 Hard Fork
3.10.2 Soft Fork
3.11 Laboratory Work
3.11.1 Program to Generate Private Keys Securely on a Hardware Wallet
3.11.2 Program to Generate Public-Private Key Pairs, Encrypting and Storing Private Keys Securely and Signing Transactions Using the Private Key
3.11.3 Program to Demonstrate Some of the Features of a Digital Wallet
3.11.4 Program to Compare the Features of Popular Digital Wallets, Rank Them Based on User Reviews and Ratings, and Recommend a Digital Wallet Based on User Preferences
3.11.5 Program to Deploy a Smart Contract to Blockchain Using a Tool Like Remix IDE
3.11.6 Program that Measures the Transaction Throughput of EOA–EOA Transactions and CA–CA Transactions Using Various Gas Limits on the Ethereum Network
3.11.7 Program that Uses Web3 to Categorize Ethereum Addresses as EOA or Contract Addresses and Evaluates Its Accuracy and Performance on a Large Dataset of Addresses
3.11.8 Program that Simulates the Life Cycle of a Transaction on the Ethereum Network and Measures the Time and Resources Required
3.11.9 Program for Implementing ECDSA
3.11.10 Program to Create a Bitcoin Transaction and Sign It with a SIGHASH Flag Using the bitcoinlib Library
3.11.11 Program for Bitcoin Mining
3.11.11.1 Sample Input
3.11.11.2 Sample Output
3.11.12 Program that Demonstrates How to Identify 51% Attackson a Blockchain
3.11.13 Program to Demonstrate the Concept of Forking
3.11.14 Program to Detect and Deal with 51% Attacks in the BitcoinBlockchain
Explanation of Code
3.12 Summary
3.13 Exercise
3.13.1 Multiple Choice Questions
3.13.2 Short Answer Questions
3.13.3 Long Answer Questions
4 Ethereum Blockchain
4.1 Overview of Ethereum Blockchain
4.1.1 Key Features
4.1.2 EVM
4.2 History of Ethereum
4.2.1 Ledger to State Machine
4.2.2 Ethereum Network
4.3 Smart Contracts
4.4 Challenges in Implementing Smart Contracts
4.4.1 Smart Contract Life Cycle
4.4.2 Introducing Solidity
4.4.2.1 Solidity Data Types
4.4.3 Global Variables
4.4.3.1 Constructing and Destroying Contracts
Constructing Contracts
Destroying Contracts
Function Syntax
Function Modifiers
Error Handling in Solidity
Using a Function Modifier
4.5 Ethereum Development Tools
4.6 Ethereum Transactions
4.6.1 Transaction Life Cycle
4.7 Gas and Transaction Fees
4.7.1 Addressing Gas Fees
4.7.2 Factors Affecting Gas Price
4.7.3 Calculating Gas Costs
4.7.4 Gas Fee Calculation
4.7.5 Implications of Base Fee
4.7.6 Transaction Cost Predictability
4.7.7 Future with PoS
4.7.8 Gas Fees and Orchid
4.7.9 Example 1: Wallet-to-Wallet Transfer
Gas Consumption Formula
Gas Consumption Calculation
4.7.10 Example 2: Deploying a Simple Contract
Gas Consumption Formula
Gas Consumption Calculation
4.7.11 Avoiding Ethereum Gas Fees
4.8 Laboratory Work
4.8.1 Solidity Program for Displaying Hello Message
Explanation of Code
SPDX License Identifier: MIT
Compiler Version Specification
Contract Definition
4.8.2 Program for Demonstrating Simple Increment and DecrementFunctions
Explanation of Code
4.8.3 Smart Contract Development with Solidity
Setting Up a Local Ethereum Development Environment
Creating a Basic Smart Contract in Solidity
Compiling and Deploying the Smart Contract
Interacting with the Deployed Contract Using web3.js
Running the Interaction Script
4.8.4 Implementing Security Measures in Smart Contracts
Identifying and Analyzing Common Vulnerabilities
Implementing Security Measures
Reentrancy Protection
Input Validation
Testing the Improved Smart Contract
Reentrancy Test
Input Validation Test
4.8.5 Developing an ERC-20 Token
Designing the ERC-20 Token Contract
Implementing Token Functionalities
Deploying the ERC-20 Token Contract
Testing Token Transactions and Interactions
4.8.6 Building a Simple DApp
Developing a Basic DApp
Integrating with a Smart Contract
Deploying the DApp and the Related Smart Contract
Testing the DApp's Functionality and Usability
4.8.7 Interacting with Off-Chain Data Using Oracles
Understanding Oracles and Their Role
Integrating an Oracle Service into a Smart Contract
Retrieving Real-World Data through an Oracle
Implementing a Use Case in a DApp
4.8.8 Program to Demonstrate a Basic Example of Smart Contract Interaction and Ownership Management on Ethereum Blockchain
Sample Input and Output
Explanation of Code
4.8.9 Program to Create a Decentralized Blind Auction Smart Contract on the Ethereum Blockchain, Enabling Participants to Place Concealed Bids, Reveal Them, and Determine the Highest Bidder While Ensuring Secure Fund Management and Transparent Auction Outcomes. This Contract Facilitates a Trustless and Tamper-Resistant Auction Mechanism, Promoting Fairness and Efficiency in Auction Processes
Sample Input and Output
Explanation of Code
4.8.10 Program to Showcase the Vulnerability of Reentrancy Attacks in a Smart Contract Context and Demonstrate the Implementation of a Solution Using a Reentrancy Guard
Sample Input and Output
Explanation of Code
4.9 Mist Browser
4.9.1 Guidlines for Using Mist Browser
4.9.2 Mist and Geth
4.9.3 Geth's Role
4.10 Summary
4.11 Exercise
4.11.1 Multiple Choice Questions
4.11.2 Long Answer Questions
5 Hyperledger
5.1 Introduction to Hyperledger
5.1.1 The Purpose of Hyperledger
5.2 Hyperledger Architecture
5.2.1 Infrastructure Layer
5.2.2 Framework Layer
5.2.3 Tool Layer
Additional Components
5.3 Hyperledger Community and Development
5.4 Hyperledger Smart Contracts (Chaincode)
5.5 The Functioning of Hyperledger
5.5.1 Contributor
5.5.2 Endorser
5.5.3 Consenter
5.5.4 Example
5.5.5 Advantages of Hyperledger
5.5.6 Limitations of Hyperledger
5.6 Hyperledger Projects
5.6.1 Comparison of Hyperledger with Other Blockchain Frameworks
5.6.1.1 Key Features of Hyperledger Explorer
5.6.1.2 Importance of Hyperledger Explorer
5.6.1.3 Notable Features of Hyperledger Explorer
5.6.1.4 Architecture of Hyperledger Explorer
5.6.1.5 Step-by-Step Installation of Hyperledger Explorer
5.6.1.6 Benefits and Uses of Hyperledger Explorer
5.6.1.7 Limitations of Hyperledger Explorer
5.6.2 Hyperledger Fabric in Blockchain
5.6.2.1 Understanding Hyperledger Fabric
5.6.2.2 Hyperledger Fabric's Operational Mechanism
5.6.3 Consensus in Hyperledger Fabric
5.6.3.1 Industry Applications of Hyperledger Fabric
5.6.3.2 Advantages Offered by Hyperledger Fabric
5.6.3.3 Constraints of Hyperledger Fabric
5.7 Hyperledger Consortiums and Networks
5.8 Hyperledger and Blockchain as a Service (BaaS)
5.8.1 Hyperledger Adoption Through BaaS
5.8.2 Advantages and Considerations
5.9 Laboratory Work
5.9.1 Program to Demonstrate Interaction with a Hyperledger Fabric Blockchain Network Using the Hyperledger Fabric JavaScript SDK
Sample Input and Output
Explanation of Code
5.9.2 Program to Demonstrate How Hyperledger Fabric Could Be Used in a Healthcare Context to Manage Patient Medical Records
Sample Input and Output
Creating a Medical Record
Querying a Medical Record
5.9.3 Program to Demonstrate the Implementation of a Basic Government Application Using Hyperledger Fabric
Sample Input and Output
Creating a Citizen Record
Querying a Citizen Record
5.9.4 Program to Demonstrate Finance Application Using HyperledgerFabric
Interaction Code – interact.js
5.9.5 Program to Demonstrate the Implementation of a Finance and Payments System Using Hyperledger Fabric
Interaction Code – interact.js
Sample Input and Output
Creating an Account
Depositing Funds
Withdrawing Funds
Querying Account Balance
5.9.6 Explanation of Code
5.9.7 Program to Demonstrate Simple Interoperability Using the Hyperledger Fabric JavaScript SDK to Interact with the Network and Demonstrate How Two Different Smart Contracts Can Work Together
Sample Input and Output
Output
Explanation of Code
5.9.8 Program to Demonstrate Smart Contract Modeling with Composer and Docker
Composer for Smart Contract Modeling
Program for Docker-Based Playground for Testing and Simulating Smart Contract
5.9.9 Program for Demonstrating Hyperledger Caliper, a Benchmarking Tool That Measures the Performance of Hyperledger Blockchain Applications Under Various Conditions
5.9.10 Running Caliper Benchmarks with Docker
5.10 Summary
5.11 Exercise
5.11.1 Multiple Choice Questions
5.11.2 Short Answer Questions
5.11.3 Long Answer Questions
5.11.4 Programming Questions
5.11.4.1 Designing a Supply Chain Management Smart Contract
5.11.4.2 Designing a Healthcare Records Management System
5.11.4.3 Designing a Decentralized Voting System
5.11.4.4 Designing a Cross-Border Payment System
6 Case Studies Using Blockchain
6.1 Blockchain – The Technology for Document Management
6.1.1 The Ownership
6.1.2 Introduction and Background
6.1.3 Problem Statement
6.1.4 Use Case Description
6.1.5 Solution Architecture
6.1.6 Implementation Steps
6.1.7 Smart Contracts
6.1.8 Data Management and Security
6.1.9 Interoperability and Integration
6.1.10 User Experience
6.1.11 Results and Benefits
6.1.12 Challenges and Lessons Learned
6.1.13 Future Enhancements and Scalability
6.1.14 Conclusion
6.2 Case Study 2: Blockchain in the Food Supply Chain
6.2.1 Introduction and Background
6.2.2 Problem Statement
6.2.3 Use Case Description
6.2.4 Solution Architecture
6.2.5 Implementation Steps
6.2.6 Smart Contracts
6.2.7 Data Management and Security
6.2.8 Interoperability and Integration
6.2.9 User experience
6.2.10 Results and Benefits
6.2.11 Challenges and Lessons Learned
6.2.12 Future Enhancements and Scalability
6.2.13 Conclusion
6.3 Case Study 3: Blokchain in the Insurance Industry
6.3.1 Introduction and Background
6.3.2 Problem Statement
6.3.3 Use Case Description
6.3.4 Solution Architecture
6.3.5 Implementation Steps
6.3.6 Smart Contracts
An Example
Deploying the InsuranceContract Smart Contract
Paying the Premium by the Policyholder
Submitting a Claim by the Policyholder
Approving the Claim by the Insurer
Cancelling the Policy by the Policyholder
6.3.7 Data Management and Security
6.3.8 Interoperability and Integration
6.3.9 User Experience
6.3.10 Analysis
6.3.11 Conclusion
6.4 Case Study 4: India's Income Tax Department's Simplification of Tax Procedures
6.4.1 Introduction and Background
6.4.2 Problem Statement
6.4.3 Use Case Description
6.4.4 Solution Architecture
6.4.5 Implementation Steps
6.4.6 Smart Contracts
An Example
Sample Input and Output
Paying Tax
Checking Tax Status
Attempting to Pay Tax Again
6.4.7 Tax Authority Interaction (Not Implemented in This SimplifiedExample)
6.4.8 Event Log
6.4.9 Data Management and Security
6.4.10 Interoperability and Integration
6.4.11 User Experience
6.4.12 Analysis
6.4.13 Conclusion
6.5 Case Study 5: Retail Banking
6.5.1 Introduction and Background
6.5.2 Problem Statement
6.5.3 Use Case Description
6.5.4 Solution Architecture
Blockchain Infrastructure
Regulatory Compliance
6.5.5 Implementation
6.5.6 Data Management and Security
Data Integrity
Data Migration
Smart Contract Auditing
Access Control
6.5.7 Network Security
6.5.8 Incident Response
6.5.9 Interoperability and Integration
6.5.10 User Experience
6.5.11 Analysis
6.5.12 Conclusion
6.6 Summary
6.7 Exercise
6.7.1 Multiple Choice Questions
6.7.2 Short/Long Answer Questions
7 Beyond Blockchain
7.1 Blockchain for the Metaverse
7.2 Emergence of the Metaverse
7.3 Understanding the Metaverse
7.4 Metaverse Layers
7.4.1 Spatial Computing
7.4.2 Metaverse Components
Virtual Worlds
Avatars
Digital Assets
Spatial Computing
Interactivity
Blockchain Technology
Decentralization
Cross-Platform Compatibility
User-Generated Content
7.5 Metaverse Through Immersive Technologies
7.5.1 Challenges in Metaverse Implementation
Interoperability
Scalability
Content Standards
Digital Identity and Privacy
Security and Trust
Digital Asset Ownership
Economic Models
Inclusivity and Diversity
User Experience
Legal and Regulatory Frameworks
Community Governance
Education and Digital Literacy
7.6 Blockchain's Role in the Metaverse
7.6.1 Why Blockchain Technology Is Crucial for the Metaverse
7.6.2 Interoperability and Standards
7.6.3 Security and Trust
7.6.4 Monetization and Incentives
7.7 Digital Scarcity and Ownership of Virtual Assets
Provenance
Ownership Rights
Scarcity
7.8 Building Trust and Security in the Decentralized Metaverse
7.8.1 Trustless Nature of the Metaverse
7.8.2 Zero Trust Security in the Metaverse
Hardware Security
Authentication and Authorization
Protection Against Deep Fakes
7.9 Data Hub for Crypto, DeFi, NFT, Metaverse
7.9.1 Real-Time Data Streaming
7.9.1.1 Data Organization
7.9.1.2 Parallel Processing
7.9.1.3 Scalability
7.9.1.4 Data Isolation
7.10 Digital Trust Networks
7.10.1 Diverse Applications of Digital Trust Networks
7.10.2 Peer-to-Peer Marketplaces
7.10.3 Platform Ecosystems
7.10.4 Zero Trust Security Systems
7.10.5 Digital Identity Platforms
7.10.6 Decentralized Autonomous Organizations
7.11 Beyond Cryptocurrency: Transforming ESG, Digital Assets,and Financial Markets
7.11.1 Environmental, Social, and Governance (ESG)
7.11.2 Digital Assets and Currency
7.11.3 Central Bank Digital Currencies
7.11.4 Blockchain Modernizing Financial Markets
7.11.5 Blockchain and AI: A Synergy for Trust and Intelligence
7.11.6 Data Analysis and Predictive Insights
7.11.7 Smart Contract Automation
7.11.8 Enhanced Security
7.11.9 Scalability and Performance
7.12 The Future of Banks
7.12.1 Instant and Efficient Cross-Border Payments
7.12.2 Streamlined Trade Finance
7.12.3 Innovative Revenue Streams
7.13 Blockchain and Sustainable Technologies
7.13.1 Renewable Energy Trading
7.13.2 Environmental Conservation
7.14 Tangle
Parallel Verification
Speed and Efficiency
Scalability
Feeless Transactions
Ecosystem Building
Coexistence with Traditional Blockchains
Future Development
7.15 Summary
7.16 Short/Long Answer Questions
Bibliography
Index