Introduction to Blockchain and Web3 from edX

Developed by the Technical Education team at the Web3 Foundation, this course introduces the fundamental concepts of Blockchain technology and Web3.

First, we go over the history and the key terminology of blockchains, Bitcoin, Ethereum and Web3 and then take a deep dive into the technology that powers blockchains. The concepts of cryptography and hashing in the context of blockchains are explored along with hands-on activities that familiarize the learners with digital wallets and blockchain explorers. Next, we explore the concepts of block production and finality, consensus, nodes and networking in blockchain networks. Towards the end of the course, we will explore the blockchain layers and applications centered around networks like Bitcoin, Ethereum and Polkadot. We wrap up the course by exploring the current landscape of Web3 and the future of blockchain technology.

The course is open to learners from all backgrounds. The key objective of this course is to provide a strong foundational knowledge pertaining to Blockchain and Web3.

What you'll learn

The history of blockchain technology, the evolution of digital money and the motivation for decentralized systems
Concepts of Cryptography and Hashing in the context of blockchains
Using Crypto wallets and Blockchain explorers
The security implications and limitations of Blockchain networks
The key differences between Proof of Work (PoW) and Proof of Stake (PoS)
The advantages and disadvantages of the distributed consensus mechanisms
The different Blockchain nodes that help sustain a decentralized network
Layer 0, Layer 1 and Layer 2 Blockchains and their key applications
The technology powering Cryptocurrencies, Decentralized Finance (DeFi), NFTs and DAOs
The future prospects of Blockchain technology and Web3

What's inside

Syllabus

Blockchain Basics

Introduction to Blockchain. Blockchain terminology. Blockchain properties. Centralization vs Decentralization. Blockchains in action. A brief history of Money. Properties of Money. How is Money created? Chaumian E-Cash and the Issue of Double Spending.

Introduction to Bitcoin and Ethereum

Money backed by computation. Hashcash and Proof of Work. Bitcoin Blockchain. How Bitcoin solves double spend issue. Bitcoin Issuance. Introduction to Ethereum. Smart Contracts. Difference between Bitcoin and Ethereum. Ethereum Transactions.

Blockchain and Cryptography

Cryptography in Blockchain. Public/Private keypairs and how do wallets work?

Hashing and Block Mining

What is a Hash? Properties of Cryptographic Hashing. How Bitcoin blocks are mined? Anatomy of a Bitcoin Block. What is Forking? What is Hashpower? How can miners tamper with PoW? Energy implications of PoW. What are the other ways to mine/validate a Block? Proof of Stake.

Blockchain Nodes and Networking

Distributed systems. Can I run my own Blockchain node? How do Blockchain nodes communicate? Interfacing with Blockchain network. Full node vs Archive node vs light client. Consensus in depth.

Web3 and the Future of Blockchain

What problems can Blockchain solve? L0, L1 and L2 Blockchains. Anonymity and confidential transactions. zkledger. zkrollups. Scams and Attacks. Culture. Public policy. Regulations. Blockchain governance. Cryptocurrencies and DeFi. DAOs. Interoperability and Scalability. NFTs. Metaverse. Decentralized computing.

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Develops an understanding of the history of digital money and blockchain technology, suitable for beginners

Examines the interoperability and scalability challenges in blockchain technology

Taught by instructors who are recognized for their work in blockchain technology

Offers hands-on labs and interactive materials to enhance understanding

Provides a comprehensive study of blockchain technology and Web3 concepts

Requires no prerequisites, making it accessible to learners from all backgrounds

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Introduction to Blockchain and Web3 with these activities:

Review Cryptography Concepts

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Cryptography is a fundamental concept in Blockchain technology. This activity will help you review the basics of cryptography in advance.

Browse courses on Cryptography

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Review cryptography concepts from your previous coursework or existing knowledge
Do practice questions on cryptography
Make sure you understand the concepts of encryption, decryption, hashing, and digital signatures

Form a Blockchain Study Group

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Form a study group to discuss Blockchain concepts, work on projects, and learn from each other.

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Find other students who are interested in forming a study group
Decide on a meeting time and place
Create a study schedule
Meet regularly to discuss Blockchain concepts and work on projects
Reflect on your study group experience

Read 'Blockchain Revolution' by Don Tapscott and Alex Tapscott

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This book provides a comprehensive overview of the Blockchain technology and its potential impact on various industries.

View Blockchain Revolution: How the Technology... on Amazon

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Read the book and make notes
Summarize the key concepts of the book
Discuss the book's implications for the future of business and technology

Four other activities

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Show all seven activities

Volunteer for a Blockchain Nonprofit

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Volunteer for a Blockchain nonprofit to gain practical experience and contribute to the Blockchain ecosystem.

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Find a Blockchain nonprofit to volunteer for
Contact the nonprofit and inquire about volunteer opportunities
Attend volunteer training
Perform volunteer duties
Reflect on your volunteer experience

Create Blockchains on Test Chains

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Create a Blockchain from scratch on one of the popular Blockchains to understand the technical details and internal logic of a Blockchain.

Browse courses on Blockchain

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Choose a Blockchain platform (e.g., Ethereum, Polygon, Solana)
Set up a test chain environment
Create a new Blockchain project
Build the Blockchain's logic
Test the Blockchain

Build a Web3 DApp

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Build a DApp to understand the practical aspects of developing on the Blockchain.

Browse courses on Web3

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Choose a Web3 framework (e.g., Truffle, Hardhat, Web3.js)
Set up a development environment
Create a new DApp project
Implement the DApp's functionality
Deploy the DApp to a Blockchain

Design a New Blockchain-Based Solution

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Design a new Blockchain-based solution to a real-world problem to think like a Blockchain architect.

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Identify a problem that can be solved using Blockchain
Research existing Blockchain solutions
Design the new Blockchain solution
Develop a prototype of the solution
Evaluate the solution's feasibility

Career center

Learners who complete Introduction to Blockchain and Web3 will develop knowledge and skills that may be useful to these careers:

Blockchain Developer

As a Blockchain Developer, you would be responsible for designing, developing, and maintaining blockchain-based applications and solutions. This course would be highly relevant to your role, as it would provide you with a solid foundation in blockchain technology, including topics such as cryptography, hashing, consensus mechanisms, smart contracts, and more. By taking this course, you would gain the knowledge and skills necessary to succeed in this rapidly growing field.

See salaries and explore the career path for Blockchain Developer

Cryptocurrency Analyst

As a Cryptocurrency Analyst, you would be responsible for researching and analyzing cryptocurrencies and other digital assets, as well as providing insights and recommendations to clients and investors. This course would be highly valuable to you, as it would provide you with a deep understanding of blockchain technology, cryptocurrencies, and the broader Web3 ecosystem. By taking this course, you would be well-equipped to succeed in this challenging and rewarding field.

See salaries and explore the career path for Cryptocurrency Analyst

Web3 Developer

As a Web3 Developer, you would be responsible for designing and developing decentralized applications that run on blockchain networks. This course would be very relevant to your role, as it would provide you with a deep understanding of blockchain technology and the Web3 ecosystem. By taking this course, you would gain the knowledge and skills necessary to succeed in this emerging and rapidly growing field.

See salaries and explore the career path for Web3 Developer

Blockchain Engineer

As a Blockchain Engineer, you would be responsible for designing, developing, and implementing blockchain-based solutions. This course would be very useful to you, as it would provide you with a solid foundation in blockchain technology, including topics such as distributed systems, consensus mechanisms, and smart contract development. By taking this course, you would gain the knowledge and skills necessary to succeed in this fast-paced and dynamic field.

See salaries and explore the career path for Blockchain Engineer

Smart Contract Engineer

As a Smart Contract Engineer, you would be responsible for designing, developing, and implementing smart contracts. This course would be very relevant to your role, as it would provide you with a deep understanding of blockchain technology and smart contract development. By taking this course, you would gain the knowledge and skills necessary to succeed in this in-demand and highly specialized field.

See salaries and explore the career path for Smart Contract Engineer

Blockchain Educator

As a Blockchain Educator, you would be responsible for teaching students about blockchain technology and its applications. This course would be very useful to you, as it would provide you with a deep understanding of blockchain technology, its history, and its potential. By taking this course, you would be well-equipped to develop and deliver engaging and informative lessons on blockchain technology.

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Blockchain Consultant

As a Blockchain Consultant, you would be responsible for advising clients on blockchain technology and helping them to develop and implement blockchain-based solutions. This course would be very useful to you, as it would provide you with a comprehensive understanding of blockchain technology and its applications across various industries. By taking this course, you would be well-equipped to succeed in this high-demand and lucrative field.

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Blockchain Researcher

As a Blockchain Researcher, you would be responsible for conducting research on blockchain technology and its applications. This course would be very useful to you, as it would provide you with a comprehensive understanding of blockchain technology, its history, and its potential. By taking this course, you would be well-equipped to succeed in this emerging and rapidly growing field.

See salaries and explore the career path for Blockchain Researcher

Blockchain Project Manager

As a Blockchain Project Manager, you would be responsible for planning, executing, and delivering blockchain projects. This course would be very useful to you, as it would provide you with a comprehensive understanding of blockchain technology, project management principles, and the dynamics of the blockchain industry. By taking this course, you would be well-equipped to lead and manage successful blockchain projects.

See salaries and explore the career path for Blockchain Project Manager

Decentralized Finance (DeFi) Analyst

As a Decentralized Finance (DeFi) Analyst, you would be responsible for researching and analyzing DeFi protocols, providing insights and recommendations to clients and investors. This course would be very valuable to you, as it would provide you with a deep understanding of blockchain technology, DeFi protocols, and the broader Web3 ecosystem. By taking this course, you would be well-equipped to succeed in this rapidly growing and highly competitive field.

See salaries and explore the career path for Decentralized Finance (DeFi) Analyst

Non-Fungible Token (NFT) Developer

As a Non-Fungible Token (NFT) Developer, you would be responsible for designing and developing NFTs, as well as creating marketplaces and other applications for NFTs. This course would be very relevant to your role, as it would provide you with a deep understanding of blockchain technology and NFTs. By taking this course, you would gain the knowledge and skills necessary to succeed in this emerging and rapidly growing field.

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Data Scientist

As a Data Scientist, you would be responsible for analyzing data to extract insights and patterns. This course may be useful to you, as it would provide you with a basic understanding of blockchain technology and its applications. By taking this course, you would be better equipped to analyze blockchain data and develop models to predict trends and patterns.

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Software Engineer

As a Software Engineer, you would be responsible for designing, developing, and maintaining software applications. This course may be useful to you, as it would provide you with a basic understanding of blockchain technology and its applications. By taking this course, you would be better equipped to develop software applications that interact with blockchain networks.

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Cryptocurrency Trader

As a Cryptocurrency Trader, you would be responsible for buying and selling cryptocurrencies in order to profit from price fluctuations. This course may be useful to you, as it would provide you with a basic understanding of blockchain technology and cryptocurrencies. By taking this course, you would gain the knowledge and skills necessary to make informed decisions in the fast-paced and volatile cryptocurrency market.

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Cryptocurrency Journalist

As a Cryptocurrency Journalist, you would be responsible for writing and reporting on cryptocurrencies and the blockchain industry. This course may be useful to you, as it would provide you with a basic understanding of blockchain technology and cryptocurrencies. By taking this course, you would be better equipped to write informed and accurate articles about this complex and rapidly evolving field.

See salaries and explore the career path for Cryptocurrency Journalist