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Computer ScienceUndergraduate 4.6 · 3,900

Blockchain & Crypto

Ledgers no one owns — hashes, blocks, consensus, keys, and smart contracts explained clearly.

Dr. Sofia Marino, Distributed Systems Researcher

Dr. Sofia Marino

Distributed Systems Researcher

Course progress0 / 3 lessons
1

Blocks & Hashes

A chain no one can quietly edit.

6 min +40 XP2 quiz questions
2

Decentralization & Consensus

Agreeing without a boss.

6 min +40 XP2 quiz questions
3

Keys & Smart Contracts

Signing, spending, and automating.

6 min +40 XP2 quiz questions

Common questions

Who is "Blockchain & Crypto" for?

It is written for learners at Undergraduate level (College), and for anyone older who wants a clear refresher on computer science. Ledgers no one owns — hashes, blocks, consensus, keys, and smart contracts explained clearly. There is no application or entry test — you can start the first lesson straight away.

How long does the course take?

There are 3 lessons totalling 18 minutes of reading and quizzes, laid out over 2 units. You can move at your own pace — progress is saved as you go.

What do I need to know before starting?

No prior coursework is assumed. The course opens with "The Ledger", covering blocks & hashes and decentralization, so the foundations are built in rather than expected.

Is the course free?

Yes. Every course on Monster Class is completely free, with no credit card, trial period or paywall. Creating a free account simply saves your progress, XP and place on the leaderboard across devices.