Blockchain Foundations
The bedrock of every blockchain system
Master the core concepts that underpin every blockchain: distributed ledgers, cryptographic hashing, consensus mechanisms, and public-key cryptography. These aren't just buzzwords — they're the precise mechanisms that make Bitcoin and Ethereum possible.
Lessons
What is a Blockchain?
Distributed ledgers vs. databases, the trust model, and why decentralization matters.
Blocks, Hashes, and Chains
How cryptographic fingerprints link blocks into a tamper-evident chain.
Distributed vs. Centralized Systems
P2P networks, Byzantine fault tolerance, and what 'trustless' really means.
Consensus Mechanisms
How strangers agree without trusting each other: Proof of Work vs. Proof of Stake.
Cryptographic Hash Functions
SHA-256, the avalanche effect, and why pre-image resistance is the foundation of mining.
Public Keys, Private Keys, and Addresses
Elliptic curve cryptography, digital signatures, and why losing a key means losing funds forever.
What you'll be able to do
- Explain how blockchains achieve immutability without a central authority
- Describe the role of cryptographic hashing in block linkage
- Compare Proof of Work and Proof of Stake security models
- Understand the mathematics behind public-key cryptography
Module exam
Blockchain Foundations Exam
10 questions · Pass to earn your certificate
Complete all lessons before taking the exam.