Blockchain Technology Study Guide 2026

Everything you need to pass the Blockchain Technology exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

📋 Blockchain Technology Exam Format at a Glance

100

Questions

90 min

Time Limit

60.00%

Passing Score

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📚 Blockchain Technology Topics to Study (175)

Test · 11 cards Test · 11 cards Test · 11 cards Test · 11 cards Test · 11 cards Test · 11 cards Test · 9 cards Test · 9 cards Blockchain Scalability and Layer 2 Solutions · 7 cards Blockchain Scalability and Layer 2 Solutions · 7 cards Blockchain Scalability and Layer 2 Solutions · 7 cards Consensus Algorithms and Protocols · 7 cards Consensus Algorithms and Protocols · 7 cards Consensus Algorithms and Protocols · 7 cards Consensus Algorithms and Protocols · 7 cards Consensus Mechanisms · 7 cards Consensus Mechanisms · 7 cards Consensus Mechanisms · 7 cards Consensus Mechanisms · 7 cards Core Blockchain Data Structures · 7 cards Core Blockchain Data Structures · 7 cards Core Blockchain Data Structures · 7 cards Core Blockchain Data Structures · 7 cards Decentralized Application Architecture · 7 cards Decentralized Application Architecture · 7 cards Decentralized Application Architecture · 7 cards Decentralized Application Architecture · 7 cards Decentralized Application (dApp) Architecture · 7 cards Decentralized Application (dApp) Architecture · 7 cards Decentralized Application (dApp) Architecture · 7 cards

See all 175 topics as flashcards →

✍️ Sample Blockchain Technology Questions & Answers

1. What does a VRF (Verifiable Random Function) provide in consensus protocols like Algorand?

✓ Unpredictable yet verifiable random leader selection

A VRF generates randomness that is unpredictable in advance but publicly verifiable afterward, used for secret committee selection.

2. In Bitcoin's HD wallets (BIP-32), what is the role of the chain code alongside an extended key?

✓ It provides additional entropy to prevent child key derivation without it

The chain code is 256 bits of extra entropy combined with the key, ensuring child key derivation requires both components to proceed.

3. What exactly is a blockchain?

✓ A peer-to-peer network distributed ledger

A blockchain is fundamentally a decentralized, distributed ledger technology that operates on a peer-to-peer network. It consists of a continuously growing list of records, called blocks, which are cryptographically linked together. This structure ensures transparency, immutability, and resistance to censorship, allowing participants to maintain and validate transactions without a central authority.

4. Why might a dApp emit indexed event parameters rather than non-indexed ones?

✓ Indexed parameters become filterable topics, enabling efficient log queries

Indexed event params are stored as topics, letting clients efficiently filter logs by their values.

5. Which practice best protects a validator node's signing keys?

✓ Store keys in a hardware security module or remote signer

Isolating signing keys in an HSM or remote signer keeps them off the internet-facing node and limits exposure.

6. In a reentrancy attack, what must the vulnerable contract do BEFORE updating its internal state?

✓ Make an external call that transfers value

Reentrancy occurs when an external call is made before state changes, letting the callee re-enter and exploit stale state.

🎯 Free Blockchain Technology Practice Tests

Test · 11 questions Test · 11 questions Test · 11 questions Test · 11 questions Test · 11 questions Test · 11 questions Test · 9 questions Test · 9 questions DeFi Security and Audits · 7 questions DeFi Security and Audits · 7 questions

📖 Blockchain Technology Guides & Articles

Your Blockchain Technology Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 Blockchain Technology Flashcards (1,199)🏆 Blockchain Technology Exam Simulation

What Practice Test Geeks adds beyond an AI chat for Blockchain

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

A timed, full-length Blockchain mock exam — 100 questions in 90 minutes with a 60% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
A fixed Blockchain question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
A printable Blockchain cheat sheet you can print or save as a PDF.
Blockchain flashcards built from the same question bank.
Free Blockchain practice tests with the correct answer shown after each question.

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