A brief introduction to the module

https://youtu.be/cvhR4d7yrQU

Let’s learn!

Read the resources provided while keeping in mind the learning objectives. There are 6 learning objectives and a final section to test your knowledge.

<aside> 💡 Learning objective 1

Understand that a blockchain is:

1. a shared database
2. immutable (history of data is not editable by anyone)
3. collectively maintained by many computers around the world
4. secured through cryptography </aside>

<aside> 💡 Learning objective 2 Understand:

1. how the nodes (computers) maintaining the blockchain agree on a single source of truth
2. examples
3. how these consensus mechanisms resist sybil attacks
4. when a chain “forks” into 2 heads, how consensus mechanisms decide which chain is the “correct one” </aside>

<aside> 💡 Learning objective 3 Understand:

1. how proof-of-work works
2. what finality means and how it affects users of blockchains
3. that blockchains like Ethereum run on a distributed system across thousands of machines across the world
4. disadvantages of PoW </aside>

<aside> 💡 Learning objective 4 Understand:

1. how Proof-of-stake works in Ethereum
2. what finality means in PoS Ethereum
3. disadvantages of PoS </aside>

<aside> 💡 Learning objective 5 Understand

1. what Ether is
2. who created Ethereum
3. who created Bitcoin
4. what Ethereum gas is </aside>