Adaptive skill practice — find your level, get sharper.

Blockchain practice

How blockchain works — the tech, not the coins

A blockchain basics quiz focused on the technology: how the chained-block ledger works, cryptographic hashing and Merkle trees, consensus mechanisms (Proof of Work, Proof of Stake, BFT), immutability and decentralization, nodes and validators, the smart-contract concept and gas, public vs private vs permissioned chains, the scalability trilemma, forks, finality, and the 51% attack — plus non-currency use cases like supply chain and identity. Understand how blockchain actually works at the computer-science level. Technology only — no coins, prices, trading, or investment advice. Part of the Developer track.

• Meets you at your level — never too easy, never too hard.

• Adapts every question to how you’re doing.

• Tracks your level over time. Skill practice, not a test.

New here? Read the Blockchain guide

A free 16-minute primer — the mental model, the mistakes beginners make, and what to practise first.

Curriculum

143 concepts across 25 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.

A. What a blockchain is

B. Cryptographic hash functions

C. Merkle trees and proofs

D. Keys, signatures and addresses

E. UTXO and account ledger models

F. Blocks, chaining and immutability

G. Proof of work, difficulty and reorgs

H. Proof of stake, validators and finality

I. Byzantine faults and attack economics

J. Nodes, clients and syncing

K. The EVM

L. Gas and the fee market

M. Transactions, nonces and the mempool

N. Solidity and contract anatomy

O. Data location and ABI encoding

P. Deployment, delegatecall and upgradeability

Q. Vulnerability classes and defensive patterns

R. Token standards

S. Rollups, data availability and L2 finality

T. Bridges and cross-chain risk

U. Account abstraction

V. Wallets and key management

W. MEV and transaction ordering

X. Oracles and the trust problem

Y. Governance, forks and the EIP process

View the full curriculum →

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