Blockchain Comps

General

How does mining work?

What prevents an attacker from modifying a blockchain?

How do we add data to a blockchain?

How do we retrieve data stored in a blockchain?

What happens in a blockchain network?

Applications

What is a smart contract?

How does a Bitcoin transaction work?

What's in a Bitcoin block?

Opinions

Should I use a blockchain?

Should I invest in cryptocurrency or blockchain companies?

Why so much hype?