Blockchain & Web3
Blockchain Fundamentals
6 practice questions. Free questions open a full answer guide; the rest unlock with Pro.
- What does it mean for a blockchain to be decentralized, and how does that prevent any single party from rewriting transaction history?
- What is the difference between probabilistic finality and the finality Ethereum gives under proof-of-stake, and why does it change how you decide a transaction is settled?Go Pro
- How does a light client verify that a transaction is included in a blockchain without downloading the full chain?Go Pro
- What does blockchain finality mean, and how does it differ between a proof-of-work chain like pre-Merge Ethereum and proof-of-stake Ethereum today?Go Pro
- How does Ethereum use Merkle (Patricia) tries to represent state, and how can a client that doesn't hold the full chain verify a single account's balance?Go Pro
- What is a consensus mechanism, and what problem does it solve in a network where nodes don't trust each other?Go Pro
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