How Blockchain Works
An immutable, distributed ledger of transactions
Blocks = Pages
Each block contains a list of transactions. Once full, it is sealed and added to the chain.
Chain = Binding
Each block is cryptographically linked to the previous one, creating an unbreakable sequence.
Distributed
Everyone has a copy. No single master copy to attack. Updates sync across the network.
Gas Fees
Crypto pays validators for processing. Economic incentives keep the network honest.
This module explains the core technology behind Web3. We'll break down what a blockchain is, how it works, and the important role cryptocurrencies play in making these decentralized networks function.
Consensus Mechanism Comparison
How different blockchains achieve agreement on truth
| Mechanism | Energy | Speed | Security | Used By |
|---|---|---|---|---|
| Proof of Work | Very High | 7-15 TPS | Very High | Bitcoin |
| Proof of Stake | Low | 15-100K TPS | High | Ethereum, Solana |
| Delegated PoS | Low | 1,000+ TPS | Medium | EOS, Tron |
| Proof of Authority | Minimal | 1,000+ TPS | Lower | Private chains |