QUIZ_01

Crypto Quiz

No leaderboard mercy.

▸ HOW TO PLAY

RANKED · six rounds from Tourist to PhD, three lives, score multipliers
CHAIN MASTERY · twelve chains, 30 questions each, earn the badge at 80%+
High score and badges are saved on this device.

🏆 BEST: 0

Crypto Master Quiz

Select your path.

USER TRACK

👶Tourist

🦍Degen

💎Pro

BUILDER TRACK

🧠Architect

👨‍💻Auditor

🎓PhD

CHAIN MASTERY

Topic Name Question 1 / 30

Score: 0

❤️❤️❤️

60s

Game Over

0 Points

Result message.

<textarea id="yfx-question-bank-raw" style="display:none;">

[TOURIST]
What does “HODL” usually mean in crypto slang?
 A. Close your exchange account and quit crypto forever
 B. Move your coins to a different blockchain every day
 C. Keep holding your coins instead of selling during price swings *
 D. Convert all your coins to cash at the first small profit
[TOURIST]
 2. What is the main purpose of a cryptocurrency wallet?
 A. To physically store paper banknotes and coins
 B. To manage your private keys and crypto addresses *
 C. To guarantee government insurance on your crypto
 D. To mine new coins automatically while you sleep
[TOURIST]
 3. What is a “private key” in crypto?
 A. A public code you share so people can pay you
 B. A secret code that lets you control your crypto *
 C. A random phrase used only to log in to exchanges
 D. A technical term for a government-approved password
[TOURIST]
 4. Which of these is a simple description of Bitcoin?
 A. A decentralised digital money with a limited supply *
 B. A central bank database for tracking cash withdrawals
 C. A private spreadsheet owned by one large tech company
 D. A loyalty point system only used in online games
[TOURIST]
 5. What is a “blockchain”?
 A. A shared digital ledger that records transactions in blocks *
 B. A locked folder on your laptop for private files
 C. A wireless router for faster internet in your house
 D. A phone app that sends text messages over Wi-Fi
[TOURIST]
 6. Why do people use “two-factor authentication” (2FA) on exchanges?
 A. To double their trading leverage automatically
 B. To skip filling in know-your-customer forms
 C. To reduce blockchain transaction fees at busy times
 D. To add an extra security step beyond a password *
[TOURIST]
 7. What is a “seed phrase” (recovery phrase)?
 A. A list of websites that teach crypto trading
 B. A set of rules for picking strong passwords
 C. A list of words that can restore your wallet *
 D. A special code that makes transactions fee-free
[TOURIST]
 8. Which of these is a good basic rule for seed phrases?
 A. Write it down and store it safely offline *
 B. Email it to yourself so it is easy to search
 C. Upload it as a note to your social media profile
 D. Type it into every website that offers free tokens
[TOURIST]
 9. What is a “hardware wallet”?
 A. A backpack with extra battery packs for your laptop
 B. A metal safe that holds cash and jewellery at home
 C. A small physical device that stores private keys offline *
 D. A bank card that only works in crypto-themed shops
[TOURIST]
 10. What is the main role of a centralised exchange (CEX) like Coinbase or Binance?
 A. To print new banknotes for governments around the world
 B. To let users buy, sell and swap crypto through a company-run platform *
 C. To permanently store every transaction in private databases only
 D. To offer free electricity to anyone running a mining rig
[TOURIST]
 11. What is a simple way to describe a “stablecoin”?
 A. A coin that never changes price by design in real life
 B. A coin backed only by lottery tickets and sports bets
 C. A token designed to track the value of something like a pound or dollar *
 D. A token that disappears from your wallet after 24 hours
[TOURIST]
 12. What is a common sign a message might be a phishing scam?
 A. It arrives from your own saved contacts list
 B. It urges you to click a link and enter your seed phrase *
 C. It uses your full legal name and correct address
 D. It arrives at the exact time you normally log in
[TOURIST]
 13. What does “Not your keys, not your coins” warn about?
 A. If you forget your password, the bank will refund you
 B. If you turn off your phone, your coins stop existing
 C. If you use more than one wallet, you lose all rewards
 D. If you do not control the private keys, you do not truly control the coins *
[TOURIST]
 14. Why do many people move long-term holdings off exchanges?
 A. Exchanges never let users withdraw funds at all
 B. Holding coins on exchanges removes all market risk
 C. Exchanges charge fees for viewing your own balance
 D. Personal wallets can give more direct control over private keys *
[TOURIST]
 15. What is usually true about crypto transactions once confirmed on-chain?
 A. They can be edited at any time by any miner
 B. They can be cancelled instantly by customer support
 C. They are deleted from the blockchain after one week
 D. They are very hard or impossible to reverse *
[TOURIST]
 16. Which of these is a safer reaction to a “free airdrop” link from a stranger?
 A. Enter your seed phrase to check eligibility
 B. Ignore it or verify it through official project channels *
 C. Connect every wallet you own to claim faster
 D. Share the link widely so everyone can join in
[TOURIST]
 17. What is a “public address” in crypto?
 A. A secret code used only when withdrawing to a bank
 B. A password that proves your identity to the government
 C. An identifier you can share so others can send you crypto *
 D. A list of your previous home addresses for KYC checks
[TOURIST]
 18. Which action helps avoid sending coins on the wrong network?
 A. Always selecting the fastest, cheapest option shown
 B. Guessing the network because most of them are similar
 C. Ignoring the token’s official documentation completely
 D. Matching the token’s network on both sending and receiving sides *
[TOURIST]
 19. What are “gas fees” on networks like Ethereum?
 A. Monthly charges for storing fuel in a physical tank
 B. Fixed fees the government collects on every trade
 C. Payments to validators or miners for processing transactions *
 D. Late penalties for forgetting to pay your internet bill
[TOURIST]
 20. Why can fees be higher during busy periods on some blockchains?
 A. Nodes shut down automatically during public holidays
 B. Coins multiply themselves when prices move up
 C. More users compete to get their transactions included quickly *
 D. Governments secretly raise fees at the end of each month
[TOURIST]
 21. Which of these is a basic benefit of using a hardware wallet?
 A. It guarantees daily trading profits regardless of markets
 B. It gives government insurance on any stored token
 C. It automatically removes all blockchain transaction fees
 D. It keeps private keys offline, reducing many online hacking risks *
[TOURIST]
 22. What is the simplest description of “fiat money”?
 A. Any coin that lives on a public blockchain
 B. Government-issued currency like pounds, euros or dollars *
 C. A special token created only for online games
 D. Any coin that never changes price on exchanges
[TOURIST]
 23. Why should you avoid sharing screenshots of your wallet’s recovery phrase?
 A. Screenshots make your phone slower over time
 B. Phone cameras cannot capture words clearly enough
 C. Screenshots increase blockchain gas fees for your wallet
 D. Anyone who sees the screenshot could steal your funds *
[TOURIST]
 24. What is a basic advantage of blockchains being public and transparent?
 A. Nobody can see any transaction amounts at all
 B. Governments can switch off the internet for one chain
 C. Anyone can view and verify transactions using a block explorer *
 D. Only miners are allowed to see balances and movements
[TOURIST]
 25. When a site asks for your “seed phrase” to fix a simple error, what is the safest assumption?
 A. The site needs it briefly and will then delete it
 B. The site must be your original wallet developer
 C. It is standard practice whenever a page fails to load
 D. It is almost certainly a scam and should be avoided *
[TOURIST]
 26. What is a “hot wallet”?
 A. A wallet stored only inside a fireproof home safe
 B. A wallet that earns a guaranteed double-digit interest
 C. A wallet that stays connected to the internet, like a browser or phone wallet *
 D. A wallet sold only in countries with very hot climates
[TOURIST]
 27. What is a “cold wallet” or “cold storage”?
 A. A wallet app that only works during winter months
 B. A wallet that is locked if prices fall too quickly
 C. A wallet that sends your coins to a freezer-backed stablecoin
 D. A wallet kept offline, such as a hardware or paper wallet *
[TOURIST]
 28. What is a simple way to describe an NFT (non-fungible token)?
 A. A token you can copy perfectly as many times as you like
 B. A token that always has the exact same value as one pound
 C. A unique digital token that can represent items like art or collectibles *
 D. A private key that unlocks every wallet on one blockchain
[TOURIST]
 29. Which practice improves your basic crypto security?
 A. Reusing the same password for every account
 B. Using a unique, strong password and enabling 2FA on exchanges *
 C. Logging in only from public café Wi-Fi networks
 D. Storing your seed phrase in your social media bio
[TOURIST]
 30. What does “DYOR” stand for?
 A. Deposit Your Official Reserves
 B. Double Your Outstanding Returns
 C. Do Your Own Research *
 D. Delegate Your Online Risks
[TOURIST]
 31. What is a “rug pull” in crypto slang?
 A. A small fee exchanges charge when you withdraw
 B. A reward program that gives free tokens to early users
 C. A slow and steady price drop over many years
 D. When project insiders suddenly drain funds and disappear *
[TOURIST]
 32. What is a meme coin?
 A. A coin that regulators issue for tax payments
 B. A token whose brand is mainly built around jokes and internet culture *
 C. A token that can only be mined in virtual reality
 D. A token that never appears on any social media platform
[TOURIST]
 33. Why should you carefully check the full wallet address before sending funds?
 A. Blockchain rules require you to memorise the entire address
 B. Short addresses cannot receive any coins at all
 C. A small typo or wrong address can send funds to the wrong place permanently *
 D. Validators will correct any mistake automatically after a delay
[TOURIST]
 34. How can a QR code help when sending crypto?
 A. It mines new coins while you point your camera at it
 B. It halves your transaction fees whenever it is scanned
 C. It encodes a wallet address so you can scan instead of typing *
 D. It guarantees your transaction will confirm in the next block
[TOURIST]
 35. What does “volatility” describe in crypto markets?
 A. A coin that always stays at exactly one fixed price
 B. A network that never confirms transactions successfully
 C. A wallet that can only hold one token at a time
 D. How quickly and sharply prices move up and down *
[TOURIST]
 36. What is one reason some people use “dollar-cost averaging” (DCA)?
 A. To guarantee profits on every single trade they make
 B. To avoid ever using exchanges or wallets of any kind
 C. To keep all savings strictly in government bonds
 D. To spread purchases over time instead of guessing one perfect entry price *
[TOURIST]
 37. Which of these best describes a crypto “airdrop”?
 A. A law that bans all crypto in one country overnight
 B. A physical delivery of coins thrown from a helicopter
 C. A paid advert that always appears above search results
 D. A distribution of free or bonus tokens to eligible wallets *
[TOURIST]
 38. What is a simple role of a block explorer like Etherscan?
 A. To set interest rates for all global central banks
 B. To store your private keys in a customer account
 C. To print physical certificates for every NFT you own
 D. To let you look up blockchain transactions and addresses *
[TOURIST]
 39. Why is it unwise to give remote access of your computer to strangers claiming to be “support”?
 A. Remote access always disconnects your internet forever
 B. Most support teams can only help through social media
 C. It automatically changes all your passwords to the same word
 D. They could see your wallet, passwords or seed phrase and steal funds *
[TOURIST]
 40. What is one basic difference between a centralised exchange and a self-custody wallet?
 A. Exchanges work without internet but wallets do not
 B. Wallets are illegal but exchanges are always government-run
 C. With a wallet you can directly control your keys; with an exchange the company holds them for you *
 D. Exchanges only support one single cryptocurrency each
[TOURIST]
 41. Why do exchanges often ask for identity documents (KYC)?
 A. To secretly learn everyone’s favourite food and hobbies
 B. To replace bank cards with branded merchandise
 C. To send physical banknotes to customers after each trade
 D. To follow regulations against money laundering and fraud *
[TOURIST]
 42. What does “crypto mining” traditionally involve on networks like Bitcoin?
 A. Digging underground for special computer chips
 B. Printing physical metal coins with QR codes
 C. Using computers to solve puzzles and secure the network *
 D. Sending paper forms to miners for manual approval
[TOURIST]
 43. Which of these is a simple use case for Ethereum beyond payments?
 A. Only storing scanned copies of physical cash
 B. Only hosting static images of bank branches
 C. Running smart contracts and decentralised applications *
 D. Acting solely as a database for credit scores
[TOURIST]
 44. What is a “paper wallet”?
 A. A paper note the government prints as a legal contract
 B. A receipt from a shop that accepts crypto as payment
 C. A written copy of your PIN printed by the exchange
 D. A wallet where private keys are written or printed on paper and kept offline *
[TOURIST]
 45. What is one simple way to recognise a fake “support” account on social media?
 A. It never responds to any user messages at all
 B. It immediately asks for your seed phrase or remote access *
 C. It always uses the exact official logo and spelling
 D. It refuses to talk about wallets or exchanges
[TOURIST]
 46. Why is using the same password on many crypto sites risky?
 A. Sites will compete to reset it every few days
 B. If one site is hacked, attackers might access your other accounts too *
 C. Exchanges block accounts with short passwords automatically
 D. Wallets require passwords that are identical for backups
[TOURIST]
 47. What is one simple benefit of testing new tools on a testnet first?
 A. Testnets pay out guaranteed profits for all users
 B. Testnets never charge any transaction fees at all
 C. Testnets store real assets but on a faster blockchain
 D. Mistakes cost only test coins, not your real funds *
[TOURIST]
 48. What is a basic description of “DeFi” (decentralised finance)?
 A. Finance run only by big banks and brokers
 B. A system where all trades happen by paper form
 C. Financial services built on smart contracts and blockchains *
 D. A way to turn every coin into physical cash instantly
[TOURIST]
 49. Which of these is a safer place to store a long-term seed phrase backup?
 A. A public photo album synced to the cloud
 B. A note saved inside a random mobile game
 C. A post in a private but unencrypted group chat
 D. A carefully stored offline copy in a secure physical location *
[TOURIST]
 50. What is the simplest reason people double-check token contract addresses before buying?
 A. To qualify for free holidays from exchanges
 B. To unlock higher leverage on all trading pairs
 C. To force the token price to move up faster
 D. To avoid fake copies and ensure they buy the correct token *
[DEGEN]
In crypto slang, what does it usually mean when someone calls themselves a "degen"?
 A. They take high-risk trades with minimal research for short-term gains *
 B. They only invest in regulated blue-chip stocks and government bonds
 C. They write the core protocol code for major blockchains as their day job
 D. They work as compliance officers preventing any speculative activity
[DEGEN]
 2. FTX collapsed in 2022 mainly because:
 A. A bug in Bitcoin’s base protocol permanently froze all exchange wallets
 B. Customer deposits were misused to cover trading losses at Alameda Research *
 C. A scheduled Bitcoin halving suddenly cut the block reward to zero
 D. All crypto spot ETFs were banned worldwide overnight
[DEGEN]
 3. Which description best fits a "cold wallet"?
 A. A wallet app that only runs on iOS and not on Android
 B. A multi-user exchange account shared by a trading desk
 C. A crypto wallet kept offline, such as a hardware device not connected to the internet *
 D. A hot wallet that rotates private keys every hour
[DEGEN]
 4. What is the maximum capped supply of bitcoin built into the protocol?
 A. Ten million coins once all halvings are complete
 B. Eighteen million coins plus any coins recovered from hacks
 C. Fifty million coins, reduced slowly by periodic burns
 D. Twenty-one million coins, after which no new BTC is issued *
[DEGEN]
 5. On most blockchains, what does a "bridge" allow users to do?
 A. Move assets or data between different networks, such as Ethereum and an L2 rollup *
 B. Turn blockchain nodes into physical routers inside data centres
 C. Mine new blocks using only mobile phones without internet access
 D. Reverse completed on-chain transactions without validators
[DEGEN]
 6. Which statement best describes a fiat-backed stablecoin like USDC?
 A. A token whose price is fixed to the gas fees on Ethereum
 B. A token designed to track one unit of fiat currency, backed by cash and short-term assets *
 C. A token that automatically doubles in supply during bull markets
 D. A token that is only usable for paying exchange trading fees
[DEGEN]
 7. In crypto, "DeFi" most commonly refers to:
 A. Decommissioned financial infrastructure run only by regulators
 B. Decentralised file-sharing for torrent-style content distribution
 C. Decentralised finance applications like lending, trading and staking built on blockchains *
 D. Default fees charged to users for late repayments on bank loans
[DEGEN]
 8. Why do users pay "gas fees" on networks like Ethereum?
 A. To pay insurance against exchange hacks on centralised platforms
 B. To compensate auditors who review smart contract code manually
 C. To pay annual licence fees for running the wallet software
 D. To compensate validators for including and executing transactions on-chain *
[DEGEN]
 9. Where did the term "HODL" originally come from?
 A. A misspelled forum post about holding bitcoin through volatility that became a meme *
 B. An official acronym created by the Bitcoin Foundation
 C. A regulatory term for legally locked-up tokens
 D. A trading bot strategy that auto-sells at fixed time intervals
[DEGEN]
 10. In crypto, what does "NFT" stand for?
 A. Network Fee Token
 B. Non-fungible token *
 C. Neutral funding target
 D. Node function template
[DEGEN]
 11. On proof-of-stake networks, what is the main purpose of staking tokens?
 A. To permanently burn coins so no one can spend them
 B. To convert coins into stablecoins pegged to local currency
 C. To help secure the network and earn rewards by validating blocks *
 D. To hide transaction history from all block explorers
[DEGEN]
 12. Why do exchanges and wallets recommend enabling two-factor authentication (2FA)?
 A. It speeds up withdrawals during periods of high network congestion
 B. It removes the need to remember passwords or seed phrases
 C. It guarantees lost funds will automatically be refunded
 D. It adds an extra login step, making account takeovers much harder *
[DEGEN]
 13. Which of these is a security advantage of using a hardware wallet?
 A. Private keys stay on a dedicated device that never exposes them directly to the internet *
 B. Transactions are automatically reversed if a scam is detected
 C. Seed phrases are stored on the manufacturer’s cloud servers
 D. Funds are insured by every central bank that recognises bitcoin
[DEGEN]
 14. Which is a classic sign that a message about your crypto account might be a phishing attempt?
 A. It comes from an address ending in the exchange’s official domain
 B. It pressures you to click a link and enter your seed phrase to avoid "immediate suspension" *
 C. It informs you of a scheduled maintenance window next week
 D. It suggests enabling hardware 2FA keys for added security
[DEGEN]
 15. What is the safest way to treat a wallet’s seed phrase?
 A. Email it to yourself and star the message for easy access
 B. Store it in a shared notes app with your trading group
 C. Keep it offline and never type it into random websites or messages *
 D. Read it aloud in trading livestreams so followers can verify it
[DEGEN]
 16. What is one key difference between a centralised exchange (CEX) and a decentralised exchange (DEX)?
 A. CEXs settle all trades on-chain, DEXs settle only off-chain
 B. CEXs never require KYC, DEXs always require full KYC
 C. CEX users always hold their own keys, DEX users never do
 D. CEXs custody user funds, while DEXs let users trade directly from their wallets *
[DEGEN]
 17. In crypto slang, what is a "memecoin"?
 A. A token whose branding is driven mainly by jokes and internet culture rather than fundamentals *
 B. A token that must be backed one-to-one by government bonds
 C. A token that only banks and regulators are allowed to trade
 D. A token that cannot be transferred between wallets after launch
[DEGEN]
 18. Bitcoin "Pizza Day" commemorates which event?
 A. The first time a bitcoin ETF traded on a U.S. exchange
 B. One of the first real-world purchases where 10,000 BTC paid for two pizzas *
 C. The launch of the Lightning Network mainnet
 D. The moment bitcoin reached a price of 100,000 US dollars
[DEGEN]
 19. Before its collapse, what was Mt. Gox best known as in the bitcoin ecosystem?
 A. A hardware wallet brand specialising in steel seed backups
 B. A layer-two scaling solution for instant bitcoin payments
 C. One of the earliest large bitcoin exchanges, later famous for a massive hack *
 D. A stablecoin project pegged to Japanese government bonds
[DEGEN]
 20. On the Ethereum mainnet, which asset is used to pay normal transaction gas fees?
 A. Wrapped bitcoin (WBTC)
 B. USD Coin (USDC)
 C. Ether futures contracts
 D. Ether (ETH) itself *
[DEGEN]
 21. On Ethereum, what does a typical wallet address look like?
 A. A long hexadecimal string starting with "0x" followed by 40 characters *
 B. A short username chosen freely by the wallet owner
 C. A traditional International Bank Account Number (IBAN)
 D. A barcode that only exchanges can scan
[DEGEN]
 22. Which statement correctly compares "on-chain" versus "off-chain" activity?
 A. On-chain means private, off-chain means publicly visible
 B. On-chain is recorded directly on the blockchain ledger; off-chain happens outside and may be settled later *
 C. On-chain is always cheaper than off-chain regardless of load
 D. Off-chain only exists on testnets and never mainnets
[DEGEN]
 23. Why is a private key so critical for a crypto wallet?
 A. It stores the user’s national ID details for KYC checks
 B. It determines which exchange an account can be opened on
 C. It allows whoever holds it to sign transactions and move the funds *
 D. It is only used once when the wallet is first created
[DEGEN]
 24. In market slang, what is a "whale"?
 A. A developer who maintains critical open-source libraries
 B. A miner who runs more than one mining rig
 C. A user who only buys fractional amounts of bitcoin
 D. An entity controlling very large holdings that can move markets with a single trade *
[DEGEN]
 25. What is a "rug pull" in crypto?
 A. When project insiders drain liquidity or funds and disappear, leaving investors with worthless tokens *
 B. When gas fees suddenly drop to almost zero during a bull run
 C. When a blockchain reverses confirmed blocks after a governance vote
 D. When a protocol distributes tokens to early users via an airdrop
[DEGEN]
 26. In leveraged trading, what does "liquidation" usually mean for a trader?
 A. Their collateral is moved into cold storage for extra safety
 B. Their position is forcibly closed because margin fell below required levels *
 C. Their unrealised profits are locked and cannot be withdrawn
 D. Their account is automatically upgraded to lower trading fees
[DEGEN]
 27. Which description best matches "yield farming"?
 A. Growing physical crops using tokenised supply chains
 B. Using only proof-of-work mining to secure a network
 C. Moving capital between DeFi pools to earn rewards and incentives *
 D. Locking tokens in cold storage without any on-chain interaction
[DEGEN]
 28. BlackRock’s IBIT, launched in the US, is best described as which kind of product?
 A. A stablecoin pegged to short-term US Treasury bills
 B. A DeFi lending protocol native to the Ethereum mainnet
 C. A central bank digital currency for cross-border settlements
 D. A spot bitcoin exchange-traded fund that holds bitcoin as its underlying asset *
[DEGEN]
 29. In the United States, which regulator is responsible for approving spot bitcoin ETFs like IBIT and FBTC?
 A. The Securities and Exchange Commission (SEC) *
 B. The Federal Reserve Board of Governors
 C. The Internal Revenue Service (IRS)
 D. The Financial Crimes Enforcement Network (FinCEN)
[DEGEN]
 30. How does a spot bitcoin ETF differ from a bitcoin futures ETF?
 A. A spot ETF holds only stablecoins, a futures ETF holds only NFTs
 B. A spot ETF holds or mirrors actual BTC, while a futures ETF holds derivatives contracts tracking BTC *
 C. A spot ETF is unregulated, a futures ETF is always unregulated too
 D. A spot ETF trades only on weekends, a futures ETF trades only on weekdays
[DEGEN]
 31. Which blockchain is associated with the native token ticker "SOL"?
 A. Polygon
 B. Avalanche
 C. Solana *
 D. Litecoin
[DEGEN]
 32. Chainlink’s work with SWIFT on tokenised assets is mainly about what?
 A. Launching a retail banking app for everyday debit cards
 B. Printing physical banknotes that contain hardware wallets
 C. Building a new proof-of-work chain that replaces Ethereum
 D. Letting traditional financial institutions test moving tokenised assets across multiple blockchains *
[DEGEN]
 33. Which situation is most likely to cause gas fees to spike on Ethereum?
 A. A sudden surge of users minting popular NFTs or trading hot memecoins *
 B. Validators deliberately turning off their hardware to save energy
 C. The network automatically doubling block size every hour
 D. Every address being forced to change its private key daily
[DEGEN]
 34. What is one advantage of holding coins in self-custody instead of leaving them on a centralised exchange?
 A. Deposits are guaranteed by every major government
 B. You control the private keys, reducing reliance on the exchange’s solvency and security *
 C. Transactions no longer need to pay gas fees
 D. Market volatility is automatically smoothed out
[DEGEN]
 35. Why is taking a screenshot of your authenticator app’s QR code risky?
 A. It permanently disables the QR code after one use
 B. It prevents you from logging in from new devices later
 C. Anyone who gets that image can clone your 2FA and access your accounts *
 D. It makes the app think your device has been rooted
[DEGEN]
 36. In crypto, what does "FOMO" describe?
 A. A protocol upgrade that adds new consensus modules
 B. A regulatory ban on specific trading strategies
 C. A tax rule about long-term capital gains
 D. The fear of missing out on a rally, driving people to buy late *
[DEGEN]
 37. What is a DAO in the crypto context?
 A. A decentralised autonomous organisation governed by token holders via on-chain rules *
 B. A centralised office that approves all blockchain transactions
 C. A data availability oracle that stores off-chain logs
 D. A digital asset obligation backed only by government guarantees
[DEGEN]
 38. What is a common use for a block explorer like Etherscan?
 A. Mining new blocks using a browser-based interface
 B. Checking transaction details, wallet balances and smart contract activity on-chain *
 C. Creating new private keys on behalf of hardware wallets
 D. Generating tax reports that are legally binding worldwide
[DEGEN]
 39. What does "block time" usually refer to on a blockchain?
 A. The time a node takes to boot its operating system
 B. The time before tokens can be withdrawn from an exchange
 C. The average time between new blocks being produced on the network *
 D. The fixed time when validators must rotate their keys
[DEGEN]
 40. In simple terms, what is a "hash" in blockchain systems?
 A. A reversible encryption of all user data for storage
 B. A secret phrase that replaces the need for private keys
 C. A public address used only for NFT marketplaces
 D. A fixed-length output from a one-way function used to secure data and link blocks *
[DEGEN]
 41. What is the goal of an Ethereum layer-two rollup like Optimism or Arbitrum?
 A. Process transactions off-chain or in compressed batches, then post data back to Ethereum for security *
 B. Replace Ethereum’s consensus with a new proof-of-work chain
 C. Issue only stablecoins that track basket currencies
 D. Run smart contracts exclusively on private enterprise servers
[DEGEN]
 42. In DeFi, "impermanent loss" most often affects which type of user?
 A. Someone simply holding BTC in a cold wallet
 B. A liquidity provider whose deposited tokens change in price relative to each other *
 C. A central bank running a CBDC pilot
 D. A validator staking only the chain’s native token
[DEGEN]
 43. Which statement best compares spot buying to margin or leveraged trading?
 A. Spot buying is only legal for institutions, leverage is only for retail
 B. Spot buying always guarantees profits, leverage always causes losses
 C. Spot buying uses only your own capital, leverage borrows extra funds that can be liquidated *
 D. Spot buying requires KYC, leverage never requires KYC
[DEGEN]
 44. In crypto services, what does "KYC" stand for?
 A. Keep Your Coins
 B. Known Yield Curve
 C. Key Yield Collateral
 D. Know Your Customer *
[DEGEN]
 45. What is a typical goal of a token airdrop?
 A. Distribute tokens to early users or the community, often as a reward or for bootstrapping governance *
 B. Permanently lock all tokens away from active users
 C. Guarantee a fixed interest rate to every wallet
 D. Force every user to pay higher network fees
[DEGEN]
 46. After large exchange failures, why do some platforms publish "proof-of-reserves" reports?
 A. To avoid having to register with any regulators
 B. To show cryptographic evidence of on-chain assets backing customer balances *
 C. To hide the size of their liabilities from auditors
 D. To replace financial statements with NFT artwork
[DEGEN]
 47. Roughly how many bitcoin were reported lost or stolen in the Mt. Gox collapse?
 A. Around eight thousand BTC
 B. Around eighty thousand BTC
 C. Around eight hundred and fifty thousand BTC *
 D. Around eight million five hundred thousand BTC
[DEGEN]
 48. Why is downloading "cracked" versions of wallet apps from unofficial websites dangerous?
 A. They always charge higher gas fees than official versions
 B. They usually disable all network connections by default
 C. They cannot connect to any blockchain mainnet
 D. They may contain malware that steals private keys and drains funds *
[DEGEN]
 49. What is a common reason some users send coins through mixing or tumbling services?
 A. To obscure the origin of funds by blending them with other users’ coins *
 B. To earn staking rewards from proof-of-stake validators
 C. To convert stablecoins directly into government bonds
 D. To pay mandatory insurance fees for DeFi protocols
[DEGEN]
 50. Many long-term bitcoin holders view BTC primarily as what?
 A. A tool for high-frequency scalping trades only
 B. A store of value similar to "digital gold" held over many years *
 C. A short-lived points system for a single gaming app
 D. A stablecoin that should never move more than one percent
[PRO]
In an optimistic rollup like Optimism, what is the sequencer’s main role?
 A. Holding user funds in a central bank-operated custody account
 B. Ordering L2 transactions and submitting batches back to Ethereum mainnet *
 C. Printing new ERC-20 tokens whenever gas prices are unusually low
 D. Encrypting private keys for users and resetting them every few blocks
[PRO]
 2. In proof-of-stake systems, what does “slashing” usually punish?
 A. Paying gas fees with tokens from a different blockchain entirely
 B. Delegating to a validator that charges a higher commission rate
 C. Validator misbehaviour such as double-signing or prolonged downtime *
 D. Using a hardware wallet instead of a browser-based wallet extension
[PRO]
 3. What is the primary purpose of an Ethereum transaction nonce?
 A. Preventing replay and ensuring each transaction is processed in order *
 B. Compressing calldata so blocks can include more user transactions
 C. Encrypting payloads so validators cannot see transaction contents
 D. Determining which validator is next to propose the following block
[PRO]
 4. In a typical DeFi money market, what is “health factor” used for?
 A. To show how many reward tokens a user can still claim
 B. To display the carbon footprint of a user’s onchain positions
 C. To calculate governance power from locked and staked governance tokens
 D. To measure how close a collateralised loan is to being liquidated *
[PRO]
 5. What is the main difference between spot DEX trading and perpetual futures?
 A. Perpetual futures always settle in fiat, never in cryptocurrency
 B. Perpetual futures have no expiry and use funding to track spot price *
 C. Spot trading requires KYC, perpetual futures never require KYC checks
 D. Spot trading only happens off-chain, perpetual futures only on L2
[PRO]
 6. Why are price oracles critical for lending protocols like Aave or Compound?
 A. They decide which validator set is eligible to propose the next block
 B. They encrypt user balances so front-ends cannot see portfolio values
 C. They feed external asset prices that determine collateral and liquidation levels *
 D. They generate new governance proposals when volatility suddenly increases
[PRO]
 7. In Uniswap v2-style AMMs, which relationship defines the constant-product curve?
 A. Token reserves multiplied together remain roughly constant (x × y = k) *
 B. Total liquidity always equals the square root of token price times volume
 C. Token reserves and price are always fixed by the governance token supply
 D. The pool’s total value must always equal the protocol’s fully diluted value
[PRO]
 8. What is a key advantage of zk-rollups over optimistic rollups?
 A. They remove gas fees entirely for all users on all chains
 B. They allow smart contracts to be written only in traditional languages
 C. They guarantee instant finality without any reliance on Ethereum at all
 D. They post succinct validity proofs instead of relying on fraud windows *
[PRO]
 9. In DeFi, what is “impermanent loss” most closely related to?
 A. Losing seed phrases after forgetting to back up a wallet properly
 B. Divergence between holding assets in an AMM pool versus holding them idle *
 C. Exchange outages causing limit orders to remain unfilled for many hours
 D. Validators missing blocks because their hardware fails during peak load
[PRO]
 10. Why does Ethereum use gas limits as well as gas prices for each transaction?
 A. To cap total work per transaction and protect the network from abuse *
 B. To decide whether a transaction should be sent to L1 or to L2
 C. To ensure validators always receive exactly the same fee per block
 D. To make sure block explorers can sort transactions alphabetically
[PRO]
 11. What is the main security assumption behind most lock-and-mint token bridges?
 A. All wallets used by bridge users are hardware-based and air-gapped
 B. The destination chain always has a higher market cap than the origin
 C. The bridge’s custody or validator set will not collude or be compromised *
 D. The underlying L1 will periodically roll back incorrect bridge transfers
[PRO]
 12. In Ethereum, what does “data availability” mainly refer to for rollups?
 A. Whether users can still download the latest Solidity compiler versions
 B. Whether private keys are stored on local devices or in cloud backups
 C. Whether a rollup runs its sequencer with renewable energy certificates
 D. Whether transaction and state data are actually published so clients can verify *
[PRO]
 13. In a typical AMM, what does increasing the pool’s total liquidity do?
 A. It guarantees higher APY rewards regardless of trade volume
 B. It reduces price impact for a given trade size, smoothing slippage *
 C. It forces governance token holders to vote on new fee structures
 D. It automatically rebalances the pool to track external price indices
[PRO]
 14. What is a good description of a “multi-sig wallet”?
 A. A wallet that requires multiple signatures to authorise a transaction *
 B. A wallet that automatically rotates seed phrases every 24 hours
 C. A wallet that only accepts stablecoins and rejects all volatile tokens
 D. A wallet that can only operate when a device stays permanently online
[PRO]
 15. What is a typical goal of MEV-aware transaction ordering on Ethereum?
 A. Guaranteeing that gas prices always fall during periods of volatility
 B. Disabling arbitrage opportunities across decentralised exchanges entirely
 C. Reducing harmful sandwiching and enabling fairer ordering for users *
 D. Forcing all NFT mints to happen at fixed, pre-scheduled block heights
[PRO]
 16. Why are reentrancy guards added to smart contracts?
 A. To prevent validators from proposing more than one block per epoch
 B. To stop wallets from sending tokens to exchanges without user approval
 C. To block miners from including transactions with unusually low fees
 D. To stop malicious contracts repeatedly calling into a function before it settles *
[PRO]
 17. In proof-of-stake, what does “delegation” allow token holders to do?
 A. Redeem governance tokens for stablecoins at a fixed conversion rate
 B. Assign staking power to validators without running validating infrastructure *
 C. Mint new coins directly whenever inflation is below a certain threshold
 D. Spend coins while they are simultaneously locked for staking rewards
[PRO]
 18. What is the main purpose of EIP-1559’s base fee on Ethereum?
 A. To pay subsidies to validators for running additional archival nodes
 B. To fix gas prices permanently across all blocks regardless of congestion
 C. To reward only long-term holders who never move their ETH balances
 D. To dynamically adjust and partially burn fees based on block demand *
[PRO]
 19. In a lending protocol, what is “over-collateralisation”?
 A. Allowing borrowers to take loans that exceed their deposited collateral
 B. Locking collateral in cold wallets controlled by centralised custodians
 C. Requiring borrowers to deposit assets worth more than the loan value *
 D. Letting governance token holders borrow with zero interest indefinitely
[PRO]
 20. What is a typical risk of very low slippage settings on DEX trades?
 A. Transactions may get auto-routed through the wrong blockchain network
 B. Wallets may accidentally sign messages not related to the intended trade
 C. Transactions always fill at worse-than-market prices due to higher fees
 D. Transactions may fail entirely if price moves slightly before inclusion *
[PRO]
 21. In Ethereum, what is “finality” usually referring to?
 A. When a transaction has at least ten confirmations on any EVM chain
 B. When a block is considered economically irreversible under the consensus *
 C. When all nodes have archived the full history into long-term cold storage
 D. When a transaction shows as “confirmed” on one popular block explorer
[PRO]
 22. Why are hardware wallets generally safer than browser extension wallets?
 A. They permanently lock tokens and block any transfers above a threshold
 B. They keep private keys off internet-connected devices and sign in hardware *
 C. They refuse to interact with any DeFi protocols or NFT marketplaces
 D. They automatically back up seed phrases to multiple cloud providers
[PRO]
 23. What is the main purpose of a Merkle proof in blockchains?
 A. To enforce that miners always include transactions in strict price order
 B. To encrypt balances so that only authorised dApps can read portfolio data
 C. To verify membership of data in a larger set using a short proof *
 D. To ensure NFTs remain bound to a single wallet address permanently
[PRO]
 24. In DeFi, what is one typical danger of “infinite” token approvals?
 A. They cause the token’s total onchain supply to double automatically
 B. They let a compromised contract spend all approved tokens from a wallet *
 C. They prevent the user from ever revoking the approval in the future
 D. They force gas costs to increase every time the token is transferred
[PRO]
 25. What does “non-custodial” usually mean for a crypto exchange or protocol?
 A. Users maintain control of private keys rather than a central operator *
 B. All trades are executed only during regular business hours on weekdays
 C. The platform holds user funds in a single, regulated omnibus account
 D. Withdrawals are processed manually after off-chain compliance reviews
[PRO]
 26. What is a key property of cryptographic hash functions like SHA-256?
 A. They guarantee no two inputs will ever share the same hash anywhere
 B. They decrypt ciphertext back into plaintext using a matching hash key
 C. They make it hard to find an input that maps to a given output *
 D. They always produce different length outputs depending on input size
[PRO]
 27. Why is “data availability sampling” important for some scaling designs?
 A. It lets wallets automatically pick the lowest-fee L2 for each transaction
 B. It turns NFT image storage into compressed, fully onchain representations
 C. It allows light clients to detect when block data has not been fully published *
 D. It lets miners delete old blocks without affecting chain finality guarantees
[PRO]
 28. In Ethereum, what does an RPC endpoint mainly provide to a wallet or dApp?
 A. A channel for encrypted seed phrase backups to a remote key server
 B. A connection to read chain state and send signed transactions to a node *
 C. A way to automatically convert gas fees into stablecoins after execution
 D. A route for validators to coordinate block proposals over private relays
[PRO]
 29. What is the role of a “relayer” in many cross-chain protocols?
 A. To move private keys from cold storage into hot wallets when needed
 B. To observe events on one chain and submit corresponding messages on another *
 C. To change governance parameters whenever two DAOs cannot reach consensus
 D. To rebase token supplies daily according to external price indices
[PRO]
 30. Why are time-weighted average price (TWAP) feeds sometimes used in DeFi?
 A. To ensure every trade executes at yesterday’s closing price exactly
 B. To calculate annual percentage yields for each new liquidity position
 C. To smooth short-term volatility and reduce oracle manipulation risk *
 D. To let users schedule transactions exclusively at specific block heights
[PRO]
 31. In Ethereum wallets, what is a seed phrase mainly used for?
 A. Signing every transaction directly instead of using a private key
 B. Acting as a human-readable backup that can regenerate all wallet keys *
 C. Broadcasting encrypted messages to validators inside each new block
 D. Voting on governance proposals without paying any additional gas
[PRO]
 32. What is a typical feature of account abstraction proposals like ERC-4337?
 A. Replacing gas fees entirely with off-chain subscription-style payments
 B. Forbidding smart contracts from holding ETH or other ERC-20 tokens
 C. Making all wallets use centralised key management providers by default
 D. Allowing smart contract wallets with custom verification and fee logic *
[PRO]
 33. In a proof-of-work blockchain, what does “difficulty adjustment” aim to do?
 A. Keep block production roughly constant despite changes in total hash rate *
 B. Ensure miner rewards always match an external commodity price index
 C. Randomly reassign mining hardware to different chains every few hours
 D. Prevent new miners from joining once the network reaches a fixed size
[PRO]
 34. What does “composability” usually mean in DeFi?
 A. Protocols can share a single token logo across many front-ends
 B. Blockchains can instantly migrate state between L1 and L2 at will
 C. Protocols can be combined like building blocks to create new strategies *
 D. Validators can run many consensus algorithms at the exact same time
[PRO]
 35. Why is oracle manipulation so dangerous for lending protocols?
 A. It permanently freezes governance so no new proposals can be created
 B. It can misprice collateral, enabling cheap borrows and bad debt creation *
 C. It forces protocols to disable withdrawals until oracle prices recover
 D. It instantly erases historical yields and reward distribution records
[PRO]
 36. In NFT standards like ERC-721, what does “tokenURI” typically point to?
 A. The address of the contract owner’s cold storage multisig on L1
 B. A DNS record controlled by the project’s legal entity or foundation
 C. A URI with metadata describing the NFT’s properties and media location *
 D. A secret key that lets holders modify the NFT image after mint
[PRO]
 37. What is the main reason deterministic execution matters for smart contracts?
 A. It lets contracts generate random numbers without oracles or beacons
 B. It ensures all honest nodes reach the same state from identical inputs *
 C. It allows users to cancel transactions after inclusion but before finality
 D. It guarantees gas usage will be identical across every EVM-compatible chain
[PRO]
 38. In a typical L2 rollup, why are withdrawals often slower than deposits?
 A. Withdrawals must be approved by central banks in multiple jurisdictions
 B. Deposits are subsidised, but withdrawals always require maximum gas usage
 C. Withdrawals may need proof verification or challenge periods on L1 *
 D. Deposits use hardware wallets, while withdrawals use only browser wallets
[PRO]
 39. In Ethereum logs, what are “events” primarily used for?
 A. Storing confidential data that only validators are allowed to decrypt
 B. Indexing and emitting structured data that off-chain apps can easily read *
 C. Replacing state variables so that contracts never need persistent storage
 D. Controlling which validators are allowed to propose blocks in each slot
[PRO]
 40. What is a key risk of depending on centralised RPC providers?
 A. They can change the consensus rules of Ethereum without notice
 B. They may censor or mis-report data, affecting what users and dApps see *
 C. They can unilaterally burn user tokens when gas prices are too low
 D. They might automatically upgrade all contracts to new compiler versions
[PRO]
 41. What is the primary purpose of a “view” function in Solidity?
 A. To read contract state without changing it or consuming gas when called off-chain *
 B. To generate new blocks faster during periods of low network activity
 C. To encrypt user balances so they cannot be read by explorers
 D. To handle token transfers that must occur only once per epoch
[PRO]
 42. In DeFi, what is a common characteristic of liquid staking tokens (LSTs)?
 A. They cannot be traded on secondary markets by protocol design
 B. They are always pegged one-to-one to a fiat currency like the dollar
 C. They represent staked assets and accrue yield while remaining transferable *
 D. They only exist on testnets and never on mainnet environments
[PRO]
 43. What is typically meant by “governance minimisation” in protocol design?
 A. Giving full protocol control to a single trusted multisig committee
 B. Ensuring no one can ever change any parameter after deployment
 C. Reducing reliance on active governance to limit attack and capture risk *
 D. Moving all governance decisions into private, off-chain legal contracts
[PRO]
 44. What is one common goal of proposer-builder separation (PBS) in Ethereum MEV design?
 A. To remove all forms of MEV extraction across every DeFi protocol
 B. To make miners responsible for governance voting and protocol upgrades
 C. To let NFT projects decide which transactions enter blocks first
 D. To separate block building from proposing, reducing centralised MEV power *
[PRO]
 45. In UTXO-based blockchains like Bitcoin, what does a “UTXO” represent?
 A. An unspent transaction output that can later be used as input *
 B. A universal token index that tracks all NFTs on the network
 C. An unused trading order sitting on a centralised exchange order book
 D. A pending transaction waiting for approval from network governance
[PRO]
 46. In DeFi risk analysis, what is a “protocol-level” risk example?
 A. A user writing their seed phrase on paper and losing the note
 B. A wallet extension being removed from a popular browser’s store
 C. A validator’s home internet going offline during a regional outage
 D. A critical bug in the protocol’s smart contracts causing global insolvency *
[PRO]
 47. Why are “allowances” important in ERC-20 token design?
 A. They let exchanges print new tokens without needing user approval
 B. They define how much a spender contract can transfer on a user’s behalf *
 C. They determine which validators can include the next block in the chain
 D. They allow stablecoins to maintain their peg during market volatility
[PRO]
 48. What is a common benefit of ERC-4626 tokenised vaults in DeFi?
 A. They prevent any protocol from integrating with them programmatically
 B. They mandate that all rewards are paid only in ETH, never in tokens
 C. They standardise yield-bearing vault interfaces for easier integrations *
 D. They force all strategies to use a single underlying price oracle
[PRO]
 49. In cross-chain design, what is “burn-and-mint” usually describing?
 A. Burning tokens on one chain then minting on another to move value *
 B. Burning governance tokens whenever users vote against a proposal
 C. Burning stablecoins whenever off-chain reserves increase significantly
 D. Burning gas tokens only when blocks are empty or under-utilised
[PRO]
 50. In Bitcoin, what happens roughly every halving cycle?
 A. The total supply of BTC automatically resets back to its genesis level
 B. The block size limit doubles and then halves to stabilise difficulty
 C. The number of active nodes is fixed by a difficulty recalculation rule
 D. The block subsidy reward paid to miners is reduced by approximately half *

[ARCHITECT]
In Solidity, why does packing several uint8 and bool fields into a single storage slot matter for gas?
 A. Because it reduces the number of SSTORE operations by fitting several values into one slot *
 B. Because it lets structs bypass the EVM stack limit entirely
 C. Because it allows values to be stored in calldata instead of storage
 D. Because it forces the compiler to inline every function that touches the struct
[ARCHITECT]
 2. What is the primary architectural risk of using delegatecall in an upgradeable proxy pattern?
 A. It automatically makes the called contract the owner of the proxy’s storage
 B. It executes in the proxy’s context, so a bug in the logic contract can corrupt the proxy’s storage *
 C. It forces every external call to be re-encoded with abi.encodeWithSelector
 D. It disables any reentrancy protection in the proxy by default
[ARCHITECT]
 3. Why is using tx.origin for access control generally discouraged in Solidity smart contracts?
 A. It is only safe when the contract is completely stateless
 B. It is always equal to msg.sender for internal function calls
 C. It lets phishing contracts trick users into calling privileged functions while still passing the tx.origin check *
 D. It is only non-zero on Ethereum mainnet
[ARCHITECT]
 4. What is the main security benefit of the Checks-Effects-Interactions pattern in Solidity?
 A. It guarantees that all external calls refund unused gas to the caller
 B. It enforces pull payments instead of push payments for every transfer
 C. It ensures the compiler can always inline state-changing functions
 D. It reduces reentrancy risk by updating internal state before making external calls *
[ARCHITECT]
 5. In an ERC-20 token, what problem does the permit function (EIP-2612) primarily solve?
 A. It lets users approve spending via an off-chain signature instead of an on-chain approve transaction *
 B. It replaces transferFrom with gasless meta-transactions only for contract wallets
 C. It disables allowances for contracts that are not audited
 D. It enforces time-locked transfers for high-value accounts
[ARCHITECT]
 6. Why is the classic “approve-then-transferFrom” allowance pattern vulnerable if wallets reset allowances from X to Y in two separate transactions?
 A. Because miners can reorder the approve and transfer to always revert the transaction
 B. Because a spender can front-run the second approve and use both the old and new allowance before it lands *
 C. Because the ERC-20 standard forbids changing allowances without first burning the token
 D. Because the EVM does not allow the same address to be both owner and spender
[ARCHITECT]
 7. What is a key architectural advantage of using TWAP (time-weighted average price) oracles for DeFi protocols?
 A. They always track CEX prices exactly in real time
 B. They are free to update and never consume gas
 C. They smooth short-term volatility, making it harder for attackers to manipulate prices within a single block *
 D. They require no on-chain storage, relying only on off-chain price feeds
[ARCHITECT]
 8. In an AMM like Curve’s stableswap, what is the main reason for using a specially shaped bonding curve instead of a simple constant-product curve?
 A. To forbid trades when the pool is close to balanced
 B. To make large trades always cheaper than small trades
 C. To keep prices almost flat near the peg while still allowing trades under imbalance *
 D. To ensure that only whitelisted addresses can add liquidity
[ARCHITECT]
 9. What is the main security difference between a multisig-controlled bridge and a light-client-based bridge?
 A. A multisig bridge has no signers and is fully automated
 B. A light-client bridge relies on social consensus rather than any cryptography
 C. A multisig bridge trusts a small group of keys, while a light-client bridge verifies consensus proofs from the source chain *
 D. A light-client bridge only works for L1→L1 transfers, never L2s
[ARCHITECT]
 10. In an optimistic rollup, what is the role of the “challenge window”?
 A. It is the period during which L1 validators can change the rollup’s fee parameters
 B. It is the period during which anyone can submit a fraud proof to contest an L2 state root *
 C. It is the fixed time window in which sequencers must produce a block or be slashed
 D. It is the time limitation during which withdrawals must be batched by the bridge operator
[ARCHITECT]
 11. Why are zk-rollups often considered to have faster withdrawal finality than optimistic rollups?
 A. Because they never publish data to L1 at all
 B. Because validity proofs let L1 verify state transitions without waiting for a fraud-proof period *
 C. Because they use higher gas limits on L2 than on L1
 D. Because they rely on trusted multisigs for emergency withdrawals
[ARCHITECT]
 12. What is the main risk when a DeFi protocol directly reads spot prices from a single DEX pool as its oracle?
 A. The price is always too close to the global market price
 B. On-chain prices do not update when CEXs halt trading
 C. Attackers can manipulate that pool’s price in a small time window and drain the protocol using flash loans *
 D. The EVM rounds all prices to the nearest whole token
[ARCHITECT]
 13. In Solidity, what does calldata offer compared with memory for function arguments in external functions?
 A. It automatically encrypts all parameters for privacy
 B. It forces the compiler to copy parameters into storage
 C. It is read-only and cheaper than copying data into memory when you only need to read it *
 D. It makes the function callable only by contracts, not EOAs
[ARCHITECT]
 14. What is a key difference between the Transparent Proxy and UUPS upgrade patterns?
 A. UUPS proxies never use delegatecall while Transparent proxies always do
 B. In UUPS, the implementation contract contains the upgrade logic itself, whereas Transparent proxies keep upgrade logic in the proxy *
 C. Transparent proxies cannot store any state, while UUPS proxies can
 D. UUPS proxies are only compatible with ERC-721 contracts
[ARCHITECT]
 15. Why is immutable often used for configuration values like addresses in Solidity contracts?
 A. It lets those values be changed by the contract owner without extra gas
 B. It stores the value in bytecode, reducing storage reads and gas costs *
 C. It automatically hides values from public view on explorers
 D. It forces the compiler to precompute all addresses with CREATE2
[ARCHITECT]
 16. What is the primary reason to emit events in critical functions even though they do not affect EVM state?
 A. Events lower gas usage for all SSTORE operations in the same transaction
 B. Events are the only way to trigger internal function calls in other contracts
 C. Events provide an indexed log for off-chain indexing and monitoring without increasing on-chain read costs *
 D. Events prevent front-running by hiding transaction details
[ARCHITECT]
 17. Why is revert with a custom error often preferred over require("string") in modern Solidity?
 A. It is the only way to stop execution in a constructor
 B. Custom errors are cheaper in gas and more structured for decoding *
 C. String reverts cannot be decoded by any tooling
 D. require no longer works for external functions
[ARCHITECT]
 18. In an ERC-20 with rebasing mechanics, what is the main architectural challenge for DeFi integrations?
 A. Rebasing tokens cannot be transferred between EOAs
 B. Balances change over time even without transfers, which can break assumptions in lending, AMMs, and collateral logic *
 C. Rebasing disables approve by design
 D. Rebase logic must be executed in every single block
[ARCHITECT]
 19. In a lending protocol, what is the usual purpose of a “health factor” or “collateralisation ratio”?
 A. To cap the total protocol TVL regardless of user behaviour
 B. To measure how many governance tokens a user holds
 C. To indicate how close a user is to liquidation based on collateral value vs debt *
 D. To track the historical gas spent per borrower
[ARCHITECT]
 20. What is a typical vector for a governance attack using flash loans?
 A. Borrowing ETH to spam the mempool with invalid transactions
 B. Borrowing tokens to temporarily gain voting power, pass a malicious proposal, then repaying in the same transaction *
 C. Borrowing NFTs to stake them into multiple protocols simultaneously
 D. Borrowing stablecoins to freeze oracle updates for a few blocks
[ARCHITECT]
 21. Architecturally, why is account abstraction (e.g. ERC-4337-style) interesting for wallet design?
 A. It removes the concept of gas entirely from Ethereum
 B. It allows smart contract wallets with programmable validation logic, such as social recovery or multi-factor schemes *
 C. It forces all wallets to be controlled by multisigs
 D. It disables EOAs from interacting directly with contracts
[ARCHITECT]
 22. In an MEV context, what is the goal of proposer-builder separation (PBS) on Ethereum?
 A. To remove validators entirely from the block production process
 B. To separate block construction from proposing, limiting the validator’s need to run complex MEV search infrastructure *
 C. To ensure all blocks have identical transaction ordering across clients
 D. To force every transaction to pay the same gas price
[ARCHITECT]
 23. In a DEX sandwich attack, why is slippage tolerance such a critical parameter for users?
 A. High slippage tolerance prevents trades from ever executing
 B. Low slippage tolerance guarantees the user will be sandwiched
 C. Loose slippage gives attackers room to move the price via frontrun/backrun and still keep the victim’s trade valid *
 D. Slippage only affects the gas cost, not execution price
[ARCHITECT]
 24. What makes stablecoin design with off-chain bank reserves (like fiat-backed models) different from overcollateralised on-chain models like DAI?
 A. Fiat-backed models hold reserves in traditional assets and rely on legal/regulatory enforcement, not just on-chain collateral *
 B. Fiat-backed models cannot ever depeg because of central banks
 C. Overcollateralised models store reserves only in physical gold
 D. Overcollateralised models require KYC for every user
[ARCHITECT]
 25. Architecturally, why do many protocols prefer Chainlink-style external oracles over using only on-chain DEX prices?
 A. Because external oracles can never be attacked
 B. Because external oracles always return the same price on all chains
 C. Because external oracles aggregate multiple sources and use specialised infra to reduce manipulation versus a single thin DEX pool *
 D. Because DEX prices are not available on L2s
[ARCHITECT]
 26. What is the core idea behind Chainlink’s CCIP in cross-chain architecture?
 A. To tunnel raw EVM bytecode between chains for execution
 B. To provide a unified, oracle-secured messaging and token transfer layer between blockchains *
 C. To replace all existing rollups with a single global chain
 D. To allow off-chain databases to be queried directly from Solidity
[ARCHITECT]
 27. In tokenised real-world asset (RWA) platforms, what is a non-trivial risk beyond smart contract bugs?
 A. Tokens always appreciating faster than underlying assets
 B. Legal enforcement around claims on off-chain assets or cash flows may fail or vary by jurisdiction *
 C. Tokens being incompatible with any EVM wallet
 D. Underlying assets being forced to run their own validators
[ARCHITECT]
 28. In light of large Mt. Gox repayments in BTC and BCH, what is the main systemic risk traders watch for?
 A. That repayments permanently raise on-chain gas limits
 B. That repayments require a hard fork of Bitcoin’s consensus
 C. That sudden supply hitting markets from creditors could add sell pressure and volatility *
 D. That all repayments must be processed through one centralised exchange
[ARCHITECT]
 29. After approval of US spot Bitcoin ETFs, how did market structure for institutional exposure to BTC fundamentally change?
 A. Institutions could only get exposure via CME futures
 B. Institutions could hold fully insured BTC directly on the Fed’s balance sheet
 C. Institutions could gain spot-like exposure via regulated ETFs without self-custodying bitcoin *
 D. Institutions were banned from holding any BTC-related product
[ARCHITECT]
 30. In Solidity, why is delegatecall often used together with a fixed storage layout standard (like EIP-1967) in upgradeable contracts?
 A. Because it lets the proxy randomly reshuffle storage slots on upgrade
 B. Because delegatecall reuses the proxy’s storage, so a consistent layout across implementations prevents corrupting state on upgrades *
 C. Because delegatecall only works for view functions
 D. Because storage layout is irrelevant when using proxies
[ARCHITECT]
 31. Why is CREATE2 useful for contract architecture in systems like factories or counterfactual deployments?
 A. It allows creation of contracts without paying any gas
 B. It guarantees that deployed contracts are immutable by default
 C. It lets you precompute a contract’s address from deployer, salt and bytecode before deployment *
 D. It forces the contract’s code hash to change every block
[ARCHITECT]
 32. In an L2 rollup, what does “data availability” primarily refer to?
 A. Whether users can read the L2 source code on GitHub
 B. Whether transaction data is accessible so that anyone can reconstruct and verify the L2 state *
 C. Whether the sequencer is located in a friendly jurisdiction
 D. Whether the L2 has its own token listed on CEXs
[ARCHITECT]
 33. Why are MPC (multi-party computation) wallets attractive for institutional custody?
 A. They remove all need for private keys
 B. They split signing across multiple parties/devices so no single point of key compromise exists *
 C. They require no coordination between signers
 D. They can only hold stablecoins, not volatile assets
[ARCHITECT]
 34. In an NFT marketplace, why did enforcing royalties fully on-chain prove difficult in practice?
 A. Because ERC-721 does not support any kind of metadata
 B. Because users can always trade NFTs peer-to-peer or on marketplaces that ignore the royalty field *
 C. Because smart contracts cannot send ETH to creators
 D. Because royalties require a new L1 hard fork
[ARCHITECT]
 35. Why is storing a seed phrase in an encrypted file on a cloud drive still considered risky?
 A. Because cloud providers always delete user files after 30 days
 B. Because every cloud provider can legally seize your keys at will
 C. Because compromise of both the file and its password (phishing, device malware, re-use) is realistic, making it a concentrated single point of failure *
 D. Because seed phrases are invalid if exported to the cloud
[ARCHITECT]
 36. What is one architectural weakness of “infinite approval” patterns for ERC-20 tokens?
 A. They stop contracts from ever calling transferFrom
 B. A compromised spender contract can drain the entire approved balance at any time *
 C. They prevent tokens from being used as collateral
 D. They disable permit signatures permanently
[ARCHITECT]
 37. In Solidity, what is the risk of using block.timestamp for critical economic logic like lotteries or auctions?
 A. Miners/validators can slightly influence the timestamp within reasonable bounds, potentially nudging outcomes *
 B. block.timestamp is always zero on testnets
 C. The EVM only updates block.timestamp once per day
 D. Timestamps are encrypted and unreadable by contracts
[ARCHITECT]
 38. What is a key design difference between a sovereign rollup and a classic L2 rollup like Optimism?
 A. Sovereign rollups always post data on a separate, non-EVM chain
 B. Sovereign rollups have their own consensus and treat the host chain mainly as a data availability layer, not as the final arbiter of validity *
 C. Classic L2s do not publish any data to L1
 D. Classic L2s cannot run arbitrary smart contracts
[ARCHITECT]
 39. In a DEX aggregator war on a single L1, what is the main architectural challenge for routing engines?
 A. They must only route trades through one chosen DEX
 B. They need to consider gas costs, pool depth, price impact, and MEV while splitting orders across many pools and venues *
 C. They must hold user funds in cold storage overnight
 D. They cannot support tokens with more than 18 decimals
[ARCHITECT]
 40. Why are timelocks commonly used on protocol treasury and parameter-changing governance actions?
 A. To reduce gas fees for all governance transactions
 B. To ensure that upgrades and large transfers have a delay window where users can react or exit before changes take effect *
 C. To prevent any changes during weekends and holidays
 D. To automatically reverse all changes after 24 hours
[ARCHITECT]
 41. In an LST (liquid staking token) ecosystem like stETH, what is one systemic risk beyond smart contract bugs?
 A. That LSTs can never be traded on DEXs
 B. That heavy concentration of staked ETH through one liquid staking provider can centralise validator power *
 C. That LSTs cannot be bridged to L2s
 D. That LSTs are incompatible with ERC-20
[ARCHITECT]
 42. Why can over-reliance on a single RPC provider be dangerous for a protocol’s front-end?
 A. Because RPC providers can change Ethereum consensus rules
 B. Because if that provider has an outage or censorship incident, users may see the dApp as “down” even though contracts are fine *
 C. Because RPC providers are required to KYC all contracts
 D. Because RPC endpoints must be rotated every block
[ARCHITECT]
 43. In zkEVM design, what does “Type 2” generally aim for?
 A. Perfect bytecode compatibility with EVM at any gas cost
 B. Exact replication of Ethereum’s execution at opcode level with minor differences in edge cases or gas metering *
 C. A new VM unrelated to the EVM
 D. No support for Solidity at all
[ARCHITECT]
 44. In a bridge that wraps tokens from Chain A to Chain B, what is the usual invariant that must always hold?
 A. Wrapped supply on Chain B is always twice the locked amount on Chain A
 B. Wrapped supply on Chain B must never exceed the locked amount on Chain A *
 C. Locked amount on Chain A must be burned periodically
 D. Wrapped tokens on Chain B must always be governance tokens
[ARCHITECT]
 45. From a security architecture perspective, why is a bug in a shared contract library (used via delegatecall) particularly dangerous?
 A. Because libraries cannot be updated or replaced
 B. Because the bug can affect many dependent contracts that all share the same logic when they delegate into it *
 C. Because libraries do not use opcodes at all
 D. Because tooling cannot trace calls made via delegatecall
[ARCHITECT]
 46. In DeFi perps exchanges, what is the primary role of the funding rate mechanism?
 A. To cap maximum leverage for all traders
 B. To keep the perp price anchored near the index/spot price by transferring payments between long and short positions *
 C. To pay validators for including perp trades
 D. To automatically liquidate all positions at expiry
[ARCHITECT]
 47. Why is “pull” payment design (users claiming funds) often safer than “push” payments in smart contracts?
 A. Because push payments are illegal in most jurisdictions
 B. Because pull payments reduce external calls from core logic, shrinking reentrancy surface and failed transfer scenarios *
 C. Because pull payments always cost zero gas for claimants
 D. Because push payments cannot emit events
[ARCHITECT]
 48. In an NFT mint contract, what is the main risk of using tx.origin to limit each wallet to one mint?
 A. Contracts cannot mint at all when tx.origin is used
 B. Users can mint from contracts they control, bypassing the limit and minting many NFTs via a single EOA behind them *
 C. tx.origin does not exist on L2 chains
 D. tx.origin only works for ERC-20 tokens, not NFTs
[ARCHITECT]
 49. In a protocol where governance can upgrade core contracts, what extra protection does a two-step “upgrade → activate” process provide?
 A. It reduces gas usage for upgrades to near zero
 B. It gives off-chain monitors and users time to review the new implementation before it is actively used *
 C. It removes the need for audits altogether
 D. It allows upgrades to bypass timelocks
[ARCHITECT]
 50. In zero-knowledge proof systems, why is a trusted setup ceremony a governance and security concern?
 A. Because it always reveals all user transaction details
 B. Because if the setup’s toxic waste is not destroyed, whoever controls it could create fake proofs and mint or withdraw assets illegitimately *
 C. Because it disables batching of proofs in the future
 D. Because trusted setups cannot be run by more than one person

Here you go — 50 [AUDITOR] questions, crypto-wide (not just BTC), difficulty between architect and PhD.
 Correct answers are mixed across A/B/C/D and marked with *.

[AUDITOR]
 In an EVM-based chain, why is using tx.origin for access control on a contract function considered a critical vulnerability?
 A. Because tx.origin changes mid-transaction when delegatecall is used.
 B. Because any contract can trick an EOA into calling it, then call the victim contract with the user’s tx.origin, bypassing msg.sender-based assumptions. *
 C. Because tx.origin is equal to block.coinbase on L2s.
 D. Because tx.origin is unset in contract-created transactions.
[AUDITOR]
 In a transparent proxy pattern (EIP-1967-style), which change in a new implementation contract is most likely to introduce a silent storage-collision bug?
 A. Adding a new event emitting an extra indexed topic.
 B. Reordering functions in the source file so the compiler generates different function selectors.
 C. Changing a public view function into external pure.
 D. Inserting a new state variable at the top of the contract before existing variables. *
[AUDITOR]
 A constant-product AMM pool starts with 10 ETH and 20,000 USDC. Ignoring fees, which invariant must remain true after every trade?
 A. The product of reserves (ETH_reserve × USDC_reserve) stays constant. *
 B. The sum of reserves (ETH_reserve + USDC_reserve) stays constant.
 C. The price (USDC per ETH) never changes by more than 1%.
 D. The ratio of reserves (ETH_reserve / USDC_reserve) stays constant.
[AUDITOR]
 Why is using block.timestamp as the sole source of randomness for user-facing decisions (lotteries, random mints) considered insecure?
 A. Because block.timestamp can only move forward, it leaks past random values.
 B. Because miners can set block.timestamp to any arbitrary 256-bit value.
 C. Because block producers have limited but real control over timestamp within a small range, letting them bias outcomes in their favour. *
 D. Because block.timestamp is not available to smart contracts during execution.

[AUDITOR]
 A lending protocol uses a DEX spot price from a thinly traded pool as its sole oracle. Which change most directly hardens it against flash-loan price manipulation?
 A. Increasing the liquidation penalty so liquidations are more profitable.
 B. Switching to a time-weighted average price (TWAP) from a deep-liquidity pool over multiple blocks. *
 C. Reducing the health-factor threshold required to trigger liquidation.
 D. Allowing liquidators to submit off-chain prices via signed messages.
[AUDITOR]
 Which cross-chain bridge design minimises trust in a small validator set on the source chain?
 A. A custodial bridge where one exchange holds assets and issues IOUs on the destination chain.
 B. A multisig-controlled lock-and-mint bridge with 5-of-8 signers, all run by the same company.
 C. A permissioned validator bridge where 21 whitelisted validators vote on every transfer.
 D. A light-client bridge where the destination chain verifies the source chain’s consensus and proof-of-state on-chain. *
[AUDITOR]
 For a zk-rollup that aims to be trustless and permissionless to exit, what must be published to the L1 base chain?
 A. Both the validity proof and enough transaction/state data for anyone to reconstruct the rollup state. *
 B. Only the validity proof; state data can remain entirely off-chain with the operator.
 C. Only calldata hashes and Merkle roots; no transaction data needs to be published.
 D. Neither proofs nor data, as long as the rollup operator is a regulated entity.
[AUDITOR]
 Which scenario best describes a classic sandwich attack on an AMM user?
 A. An attacker spams a mempool with failing transactions to delay a victim’s swap.
 B. A bot executes a trade immediately after a large swap to arbitrage price differences across DEXs.
 C. A bot detects a user’s pending swap, submits a buy just before it and a sell just after, capturing value from the user’s slippage. *
 D. A miner censors all transactions except their own arbitrage trades for an entire block.

[AUDITOR]
 In ECDSA (e.g. secp256k1 signatures), what is the main risk if the same nonce k is accidentally reused with the same private key for two different messages?
 A. An attacker can forge signatures but cannot recover the private key.
 B. An attacker can recover the private key from the two signatures. *
 C. The signatures become invalid on all EVM chains after the next hard fork.
 D. The chain’s consensus nodes will automatically slash the key holder.
[AUDITOR]
 A DAO treasury currently sits in a single EOA controlled by one core contributor. Which redesign most meaningfully reduces the single-key compromise risk without relying on a custodian?
 A. Moving the funds to a new EOA protected by a more expensive hardware wallet.
 B. Splitting the funds evenly across three EOAs all controlled by the same person.
 C. Keeping funds in the same wallet but enabling on-chain timelocks for outgoing transfers.
 D. Migrating the treasury to a 3-of-5 multisig where keys are held by independent, geographically separated signers. *
[AUDITOR]
 In a security review, why is property-based fuzzing (e.g. using Echidna or Foundry’s invariant testing) powerful for DeFi protocols?
 A. It automatically explores many input combinations to try to violate high-level invariants defined by the auditor. *
 B. It guarantees that no vulnerabilities remain if no invariant is ever violated.
 C. It replaces the need for unit tests entirely, making manual testing unnecessary.
 D. It only detects gas-inefficiency issues and cannot find logic bugs.
[AUDITOR]
 Which of the following is the best example of a safety invariant for an ERC-20 token that an auditor might fuzz-test?
 A. The token’s price in USD never falls by more than 10% in a day.
 B. The number of token holders always increases over time.
 C. The sum of all account balances always equals totalSupply, except for known rounding or burn mechanics. *
 D. The token’s daily trading volume on DEXs stays above a fixed threshold.

[AUDITOR]
 Which combination most robustly mitigates simple reentrancy attacks on a state-modifying function that sends ETH to arbitrary user-controlled contracts?
 A. Performing the external call first and then updating internal balances.
 B. Updating internal balances before the external call and guarding the function with a nonReentrant modifier. *
 C. Relying on block.timestamp to ensure calls are spaced out over time.
 D. Using require(tx.origin == msg.sender) to block contract calls.
[AUDITOR]
 Why is the “pull over push” payment pattern generally safer for withdrawals in DeFi protocols?
 A. It lets the protocol batch withdrawals to save gas.
 B. It prevents front-running altogether.
 C. It ensures KYC is enforced for all recipients.
 D. It makes users call a withdrawal function themselves, avoiding untrusted external calls inside core protocol logic. *
[AUDITOR]
 Which practice most reduces the blast radius if a DEX or spending contract is later found to be malicious or compromised?
 A. Encouraging users to sign narrowly scoped, time-limited permit approvals instead of unlimited approvals. *
 B. Replacing ERC-20 with ERC-721 tokens for all assets.
 C. Forcing users to approve twice as much as they intend to trade.
 D. Storing user private keys in a secure enclave on the DEX’s server.
[AUDITOR]
 From an auditor’s perspective, why is an unusually high default slippage tolerance in a DEX front-end a red flag?
 A. It increases the chance that trades will fail with an “INSUFFICIENT_OUTPUT_AMOUNT” error.
 B. It causes the contract to skip price-impact checks entirely.
 C. It widens the range in which sandwich attackers can profitably move prices against users before their trades revert. *
 D. It makes gas fees deterministic for all users.

[AUDITOR]
 When auditing a lending protocol that uses interest-bearing tokens, which check best validates that interest accrual cannot silently underflow or overflow balances?
 A. Confirming that APR values are always between 0% and 20%.
 B. Verifying that interest calculations use scaled fixed-point math with bounds checks and cannot exceed type limits over realistic time horizons. *
 C. Ensuring that interest is only updated when users deposit or withdraw.
 D. Requiring interest accrual to happen in an off-chain script.
[AUDITOR]
 A lending market reads prices from an oracle updated once per hour. What is the main systemic risk from an auditor’s viewpoint?
 A. Gas fees for oracle updates may become too high.
 B. Users may see slightly stale prices in the UI.
 C. Liquidation penalties may be too generous for liquidators.
 D. Sharp market moves between updates can leave the protocol under-collateralised before liquidations can trigger. *
[AUDITOR]
 Why are Merkle trees widely used for on-chain proofs of inclusion (e.g. airdrops, L2 exits)?
 A. They allow very small proofs whose size grows logarithmically with the number of entries. *
 B. They prevent censorship at the consensus layer.
 C. They guarantee that each element in the tree is unique.
 D. They make hashing operations free in terms of gas.
[AUDITOR]
 On a PoS L1 with probabilistic finality, why is it dangerous for a bridge to treat a single confirmation as final?
 A. Because block rewards are paid only after 32 confirmations.
 B. Because gas prices are volatile in the first block.
 C. Because short-range reorgs can revert recently included transactions, leading to minted assets without locked collateral. *
 D. Because consensus clients cannot read events from the first block.

[AUDITOR]
 Which statement about delegatecall in the EVM is most accurate from a security perspective?
 A. delegatecall executes code in a child contract with its own storage and msg.sender.
 B. delegatecall executes code from another contract but uses the caller’s storage, msg.sender and msg.value. *
 C. delegatecall always reverts if the callee has no code.
 D. delegatecall cannot be used with libraries.
[AUDITOR]
 Why can an externally callable selfdestruct function in a contract be problematic even if the contract holds no ETH?
 A. It causes the contract’s address to change, confusing indexers.
 B. It doubles the gas cost of all function calls to that contract.
 C. It only affects users who call the selfdestruct function themselves.
 D. It can permanently remove code relied on by other contracts, bricking protocol functionality. *
[AUDITOR]
 From an auditor’s perspective, what is the key risk of a protocol that relies solely on emitted events (and not storage) to track critical balances?
 A. Events are not part of the contract’s state and can be omitted, reordered or crafted inconsistently without affecting consensus. *
 B. Events cannot be read by off-chain indexers.
 C. Events are automatically pruned from full nodes after 256 blocks.
 D. Events are always cheaper than writing to storage, so the risk is only economic.
[AUDITOR]
 Why is a written, high-level specification valuable before starting a deep smart-contract audit?
 A. It guarantees that the implementation will be free of bugs.
 B. It allows auditors to skip reading large portions of the code.
 C. It defines intended invariants and behaviours, against which auditors can reason about deviations and emergent attack surfaces. *
 D. It replaces the need for unit tests and integration tests.

[AUDITOR]
 Why are BLS signatures attractive for aggregate validator signatures in PoS systems compared to ECDSA?
 A. Because BLS signatures are quantum-secure.
 B. Because multiple BLS signatures on different messages can be aggregated into a single short signature verified once. *
 C. Because BLS signatures require no pairing operations to verify.
 D. Because BLS private keys are impossible to back up.
[AUDITOR]
 Which collateral model historically has shown the highest systemic risk of death spirals in crypto?
 A. Fully fiat-backed stablecoins with monthly attestations.
 B. Over-collateralised stablecoins backed by on-chain assets like ETH.
 C. Commodity-backed stablecoins with audited warehousing.
 D. Purely algorithmic stablecoins relying on reflexive mint-and-burn mechanics without robust collateral. *
[AUDITOR]
 For an over-collateralised crypto-backed stablecoin, which design choice most improves resilience during a rapid market crash?
 A. Conservative collateral ratios with aggressive liquidation incentives that keep positions over-collateralised. *
 B. A flat 1:1 collateral ratio regardless of asset volatility.
 C. Allowing users to disable liquidations on their positions.
 D. Pegging solely via governance votes rather than arbitrage.
[AUDITOR]
 A rollup uses a small permissioned data-availability committee (DAC) instead of posting full data to L1. What is the main security trade-off?
 A. Transactions become MEV-free.
 B. Gas costs on L1 increase significantly.
 C. Users must trust the DAC not to withhold data, or else exits and fraud proofs may become impossible. *
 D. L1 validators can no longer verify rollup proofs.

[AUDITOR]
 When reviewing contracts, why should auditors still pay attention to view and pure functions?
 A. They consume gas and can directly change contract storage.
 B. Bugs or misleading logic in view functions can cause off-chain systems and UIs to make unsafe assumptions or decisions. *
 C. They are executed only on archive nodes.
 D. They can be ignored because they cannot be called from other contracts.
[AUDITOR]
 Which is the safest default behaviour for a contract’s receive/fallback function if it is not meant to accept ETH?
 A. Accept ETH silently and emit no events.
 B. Accept ETH and forward it to msg.sender.
 C. Accept ETH but store the sender and amount in storage.
 D. Revert the transaction so that unexpected ETH can’t be sent in. *
[AUDITOR]
 What kind of issues is a tool like Slither primarily designed to help auditors spot?
 A. Static anti-patterns and suspicious code constructs such as reentrancy patterns, unchecked calls and dangerous delegatecalls. *
 B. Runtime gas spikes due to mainnet congestion.
 C. Economic design flaws in protocol tokenomics.
 D. Private-key compromises in users’ wallets.
[AUDITOR]
 An auditor writes a simple reference implementation of a protocol and compares outputs against the production implementation on random inputs. What technique is this?
 A. Symbolic execution.
 B. Mutation testing.
 C. Differential testing (a.k.a. “spec vs impl” testing). *
 D. Formal verification using SMT solvers.

[AUDITOR]
 An NFT marketplace routes trades through an external router contract that can transfer NFTs with safeTransferFrom or transferFrom. Which design most reliably enforces creator royalties on-chain?
 A. Relying on off-chain indexers to track unpaid royalties.
 B. Enforcing royalties at the token contract level, making transfers that skip royalty logic impossible. *
 C. Adding a warning banner in the marketplace UI.
 D. Using a centralised database to track trades.
[AUDITOR]
 In Bitcoin-style UTXO forensics, what does the common-input ownership heuristic assume?
 A. All UTXOs in a transaction’s outputs belong to one entity.
 B. Any address that ever appears in more than one transaction belongs to an exchange.
 C. Multi-sig outputs always involve unrelated parties.
 D. Most of the inputs to a single transaction are controlled by the same entity. *
[AUDITOR]
 Why do mixers that rely solely on fixed-size anonymity sets (e.g. classic tumblers) often fail to provide strong privacy in practice?
 A. Correlated deposit/withdraw timing and amounts can let analysts probabilistically link flows despite mixing. *
 B. Hash functions used in mixers are generally broken.
 C. Consensus nodes leak private notes over p2p.
 D. Mixers eliminate all transaction fees, drawing regulators’ attention.
[AUDITOR]
 From a smart-contract auditor’s perspective, what is a realistic limitation of on-chain sanctions screening lists implemented as Solidity mappings?
 A. They are automatically synchronised with every national sanctions list.
 B. They can freeze tokens even on other L1s and CEXs.
 C. They can only enforce policy on that specific contract’s flows; assets can often move around them via other contracts or bridges. *
 D. They make the protocol legally immune to all compliance risk.

[AUDITOR]
 How does an MPC wallet differ from a classic on-chain multisig from a risk-modelling perspective?
 A. MPC wallets require every signer to run a full node.
 B. MPC combines key shares off-chain into a single on-chain key, so failures look like an EOA compromise at the contract layer. *
 C. Multisigs cannot enforce spending policies.
 D. MPC removes the need for any key storage.
[AUDITOR]
 Why might an exchange still suffer a large loss even if it stores most funds in HSM-protected cold wallets?
 A. HSMs are incompatible with multi-sig schemes.
 B. HSMs automatically broadcast any signed transaction.
 C. Cold wallets are directly exposed to internet-facing APIs.
 D. Operational processes may require moving significant funds through hot wallets, which can be compromised. *
[AUDITOR]
 What is the main purpose of a censorship-resistant “force inclusion” or “escape hatch” mechanism in rollup designs?
 A. To let users bypass a censoring sequencer by forcing transactions directly into the rollup contract on L1. *
 B. To allow sequencers to pause the rollup during upgrades.
 C. To prevent any failed transactions from reverting.
 D. To guarantee zero MEV on the rollup.
[AUDITOR]
 Why do many protocols route sensitive admin actions (parameter changes, upgrades) through on-chain timelocks?
 A. To reduce gas costs for admin transactions.
 B. To avoid the need for off-chain governance.
 C. To give users and auditors time to react to, review or exit before changes take effect. *
 D. To prevent any future upgrades once the protocol is deployed.

[AUDITOR]
 From an auditor’s standpoint, which issue is most appropriately classified as “informational” rather than “critical”?
 A. Anyone can drain all user funds from the main vault via a single call.
 B. A function name is misleading but does not affect behaviour or safety. *
 C. Oracle manipulation can bankrupt the protocol in one transaction.
 D. A misconfigured access control lets any address change the protocol’s fee rate.
[AUDITOR]
 Which design choice makes a bug-bounty programme more credible to sophisticated white-hat hackers?
 A. Paying only in the protocol’s governance token with long vesting.
 B. Capping the maximum bounty at a few hundred dollars.
 C. Requiring full KYC before even reporting a bug.
 D. Publishing clear severity tiers with payout ranges and demonstrating past good-faith payouts. *
[AUDITOR]
 What is a major downside of implementing an irreversible “kill switch” that permanently disables a protocol contract?
 A. It can create a centralised power that, if compromised or abused, lets a single actor brick the protocol. *
 B. It always increases gas costs for normal users.
 C. It is incompatible with upgradable proxies.
 D. It prevents integrating with any other DeFi protocols.
[AUDITOR]
 Compared to a kill switch, what is generally a safer design for handling emergencies in DeFi protocols?
 A. Disabling all functions permanently after the first incident.
 B. Doing nothing and trusting markets to sort out losses.
 C. Implementing a pause mechanism with scope-limited controls, strict access, and clear unpause procedures. *
 D. Giving any user the ability to pause the protocol at will.

[AUDITOR]
 In Solidity ^0.8.0, what is the primary reason auditors still sometimes recommend using custom safe-math libraries?
 A. Because arithmetic is still unchecked by default and will silently wrap.
 B. Because custom libraries can add domain-specific checks and clearer error messages on overflows/underflows. *
 C. Because the compiler ignores overflows in pure functions.
 D. Because libraries disable compiler optimisations.
[AUDITOR]
 Which scenario is a textbook example of a transaction-ordering dependence (TOD) vulnerability?
 A. A contract that stores the last caller’s address.
 B. A function that depends on block.timestamp.
 C. A function that reads msg.value.
 D. A function that sends rewards to the first caller of the day, where multiple users can race to call in the same block. *
[AUDITOR]
 How does a flash mint differ from a traditional flash loan?
 A. Flash mints create new tokens within the same transaction and require them to be burned by the end, instead of borrowing existing liquidity. *
 B. Flash mints are only possible on L2s.
 C. Flash mints cannot be used for arbitrage.
 D. Flash mints do not require any form of collateral or repayment.
[AUDITOR]
 Why might auditors recommend per-epoch withdrawal limits or rate-limits for large DeFi vaults?
 A. To increase swap fees for LPs.
 B. To simplify accounting for the protocol team.
 C. To limit the maximum damage from a single key compromise or logic bug before the issue is detected. *
 D. To prevent any user from ever exiting the protocol fully.

[AUDITOR]
 In a commit-reveal scheme, why is it recommended to hash both the choice and a user-specific random salt?
 A. To reduce gas by shortening the commitment.
 B. To avoid the need for Merkle proofs.
 C. To ensure the commitment can be recomputed without the original choice.
 D. To prevent attackers from brute-forcing or rainbow-tabling low-entropy choices from the commitment. *
[AUDITOR]
 When auditing an upgrade to a proxy-based protocol, what is the most effective first step?
 A. Re-reading the entire original codebase from scratch.
 B. Ignoring previous audits since they are now obsolete.
 C. Reviewing a precise diff between old and new implementations, focusing on changed storage, access control, and external call patterns. *
 D. Only checking that the new implementation compiles with the latest Solidity version.
[PHD]
In comparative design of zk-SNARKs and zk-STARKs for rollups, which statement is most accurate?
 A. zk-SNARKs typically require a trusted setup and offer small proofs, while zk-STARKs avoid trusted setup at the cost of larger proofs and higher on-chain verification costs. *
 B. Both zk-SNARKs and zk-STARKs inherently require per-circuit trusted setups but zk-STARKs have strictly smaller proofs.
 C. zk-SNARKs are information-theoretically secure whereas zk-STARKs rely on elliptic-curve assumptions.
 D. zk-STARKs cannot support recursion, while zk-SNARKs fundamentally require recursive composition to be sound.

[PHD]
 2. Regarding the long-term quantum security of ECDSA and BLS signatures used in blockchains, which statement best reflects current understanding?
 A. ECDSA can be patched to resist Shor’s algorithm by increasing key sizes, while BLS signatures cannot be similarly strengthened.
 B. Both ECDSA and BLS rely on discrete-log-type assumptions that are broken by sufficiently large fault-tolerant quantum computers implementing Shor’s algorithm, so neither is considered quantum-safe. *
 C. BLS signatures are believed quantum-safe because they operate over pairings, whereas ECDSA is not.
 D. ECDSA is vulnerable only when used with reused nonces, whereas BLS is vulnerable regardless of implementation.
[PHD]
 3. In Proof-of-Stake Ethereum, the “weak subjectivity period” is best described as:
 A. The minimum time a new validator must remain online before earning any rewards.
 B. The maximum duration a validator can propose consecutive blocks without being challenged.
 C. The maximum time a node can safely be offline before, on restart, it must obtain a recent, trusted checkpoint to avoid accepting a long-range attack. *
 D. The fixed time window during which finalized blocks may still be reorged by honest majority.
[PHD]
 4. In a data-availability-sampling (DAS) design for Ethereum-style danksharding, which parameter most directly controls the probability an adversary can hide a large portion of blob data without detection?
 A. The gas limit per block used by the execution layer.
 B. The number of validator keys controlled by honest parties.
 C. The maximum blob size allowed per block.
 D. The number of independent samples (and sample size) each light client requests, assuming uniform random sampling. *
[PHD]
 5. When choosing between KZG and inner-product-argument (IPA) polynomial commitments for a rollup proving system, which trade-off is most accurate?
 A. KZG commitments give constant-size proofs and fast verification but require a structured reference string, while IPA-based schemes avoid trusted setup at the cost of logarithmic-size proofs and more expensive verification. *
 B. KZG commitments avoid trusted setup but require proofs linear in the polynomial degree, while IPA-based schemes use a universal SRS.
 C. KZG commitments are post-quantum secure, while IPA-based schemes are not.
 D. IPA-based schemes cannot support batched opening proofs, whereas KZG does.
[PHD]
 6. Which condition is most critical to safely applying the Fiat–Shamir transform to make an interactive proof system non-interactive for real-world blockchain use?
 A. The protocol must be perfectly zero-knowledge in the information-theoretic sense.
 B. The protocol should be public-coin and analysed in the (quantum) random-oracle model, ensuring the challenge can be modelled as a hash of the transcript. *
 C. The prover must have strictly linear-time complexity in the witness size.
 D. The verifier must be stateful across invocations to prevent replay.
[PHD]
 7. For a validity rollup settling to Ethereum, what is the primary security purpose of a “forced withdrawal” or “escape hatch” mechanism?
 A. To let sequencers delay inclusion of large transactions during congestion.
 B. To allow users to bypass on-chain proof verification and withdraw directly from the sequencer.
 C. To guarantee users can exit by posting a proof and transaction data on L1 even if all sequencers are censoring or offline. *
 D. To enable governance token holders to veto withdrawals exceeding a threshold.
[PHD]
 8. In optimistic rollup designs, which statement about the challenge (fraud-proof) window is most accurate?
 A. It primarily limits the maximum gas that a single L2 transaction may consume.
 B. It is required so that validity proofs can be generated recursively on-chain.
 C. It determines the rate at which L2 sequencers can rotate without changing security assumptions.
 D. It gives honest actors time to submit fraud proofs before L2 state roots are considered final on L1, bounding the impact of invalid state transitions. *
[PHD]
 9. Ethereum’s proposer–builder separation (PBS) as implemented via MEV-Boost primarily aims to:
 A. Separate block construction from block proposal so that specialized builders can compete to supply blocks, mitigating MEV centralisation at the validator level. *
 B. Allow validators to construct blocks entirely off-chain, bypassing the beacon chain fork-choice rule.
 C. Enable L2 sequencers to directly submit blocks to the beacon chain without validators.
 D. Replace the fork-choice rule with an auction over finalized checkpoints.
[PHD]
 10. In Ethereum’s LMD-GHOST fork-choice rule, “latest message driven” refers to:
 A. Selecting the chain with the largest cumulative difficulty from proof-of-work checkpoints.
 B. Using only each validator’s most recent attestation when scoring branches in the fork-choice algorithm. *
 C. Requiring that every validator attest to every slot, otherwise their stake is slashed.
 D. Forcing proposers to build on the block that most recently included MEV-Boost bids.
[PHD]
 11. Under normal network conditions, what event would cause the beacon chain to revert a previously finalized checkpoint?
 A. A single validator equivocates by signing two block proposals for the same slot.
 B. An L2 rollup posts an invalid state root to L1.
 C. More than one-third of the total stake violates safety assumptions (e.g., through correlated equivocation), making two conflicting finalized checkpoints possible. *
 D. A majority of validators decide via off-chain governance vote to roll back the chain.
[PHD]
 12. In shared-security systems such as restaking frameworks, which risk is most closely associated with “correlated slashing”?
 A. Individual validators losing funds due to local key compromise.
 B. Users losing funds because an L2 experiences a liquidity crisis.
 C. Bridges halting because of an oracle price-feed failure.
 D. A single client bug or misconfiguration causing many validators restaked across multiple services to be slashed simultaneously. *
[PHD]
 13. A shared sequencer network used by multiple rollups primarily aims to:
 A. Provide a common ordering layer across rollups to reduce cross-domain MEV and improve atomic composability of transactions spanning several L2s. *
 B. Replace L1 consensus with an off-chain committee that finalises all blocks.
 C. Ensure each rollup has a unique, independent ordering of transactions.
 D. Optimise gas costs by removing the need for data availability sampling.
[PHD]
 14. Compared with a simple N-of-M multisig bridge, a light-client-based bridge typically:
 A. Requires fewer cryptographic assumptions because it does not verify the source chain’s consensus.
 B. Inherits the security of the source chain’s consensus by verifying its headers or state proofs, at the cost of higher on-chain verification costs. *
 C. Is more vulnerable to 51% attacks on the source chain because headers are ignored.
 D. Eliminates the risk of relayer censorship because all messages are processed deterministically.
[PHD]
 15. A “time-bandit attack” on a proof-of-work chain most closely involves:
 A. Exploiting timestamp manipulation to invalidate old blocks and reclaim block rewards.
 B. Using time-locked contracts to force counterparties into unfavourable settlement windows.
 C. Re-mining recent blocks to capture historical MEV, making it profitable to reorganise the chain when hash power is concentrated. *
 D. Forcing miners to include only time-sensitive transactions with higher priority fees.
[PHD]
 16. MEV-smoothing or MEV-pooling mechanisms for PoS validators are primarily introduced to:
 A. Increase the variance of validator rewards, strengthening economic incentives to stay online.
 B. Eliminate MEV entirely by banning private order flow and builder auctions.
 C. Replace block rewards with purely fee-based compensation.
 D. Reduce reward variance and lower incentives for centralisation by sharing MEV income across a validator set or pool. *
[PHD]
 17. Why is address reuse on ECDSA-based blockchains (e.g., Bitcoin, Ethereum) considered especially problematic under a future large-scale quantum adversary?
 A. Once a public key has appeared on-chain, a quantum adversary can run Shor’s algorithm to derive the private key, so reusing that address increases the value at risk. *
 B. Address reuse prevents the use of SegWit, which is inherently quantum-safe.
 C. Quantum attacks require seeing multiple signatures from distinct addresses to succeed.
 D. Quantum computers can only attack multisig wallets, not single-key addresses.
[PHD]
 18. In VRF-based leader election, which subtle issue can introduce bias if not carefully mitigated?
 A. Requiring on-chain randomness be drawn from current block hashes.
 B. Allowing participants to generate many candidate keys and discard those that would give low selection probabilities, a “grinding” attack. *
 C. Forcing VRF outputs to be verified off-chain using MPC.
 D. Publishing VRF proofs only after block finality.
[PHD]
 19. A primary goal of robust distributed key generation (DKG) in threshold schemes is to:
 A. Remove the need for any broadcast channel during setup.
 B. Ensure the final group public key is known only to the dealer.
 C. Prevent participants from mounting rogue-key attacks by choosing keys that bias or reveal the group secret. *
 D. Guarantee that each participant holds identical private key shares.
[PHD]
 20. Which description best fits a “Type 1” zkEVM in the commonly used taxonomy?
 A. A design that replaces Ethereum’s state model with UTXOs while preserving EVM opcodes.
 B. A rollup that emulates Solidity source code directly without modelling bytecode.
 C. An L2 that compiles high-level languages to a separate zk-VM and does not aim for Ethereum-equivalence.
 D. A zkEVM that strives for full Ethereum-equivalence at the bytecode level, preserving existing opcodes and state transition semantics. *
[PHD]
 21. In ERC-4337-style account abstraction, the “bundler” role is primarily responsible for:
 A. Aggregating user operations (UserOps) from the mempool into a transaction that calls the EntryPoint contract, in exchange for gas fees. *
 B. Acting as a trusted relay that directly signs transactions on behalf of users.
 C. Providing a post-quantum signature scheme for smart-contract wallets.
 D. Serving as the slashing oracle for misbehaving validators.
[PHD]
 22. Compared with Ethereum’s current Merkle–Patricia tries, Verkle trees primarily improve:
 A. The cryptographic security level against preimage attacks.
 B. Proof size for stateless clients, by using higher-arity vector commitments that yield much smaller state witnesses. *
 C. Latency of block propagation by compressing execution payloads.
 D. Gas pricing for calldata transactions over 32 bytes.
[PHD]
 23. In a stateless Ethereum design, what is the main purpose of a “witness” attached to a transaction or block?
 A. To prove that the proposer is a registered validator.
 B. To carry transaction-level privacy metadata for shielded transfers.
 C. To provide the Merkle/Verkle proof data needed to execute state transitions without requiring the full state locally. *
 D. To allow blocks to exceed the usual gas limit under congestion.
[PHD]
 24. Compared with hash time-locked contracts (HTLCs), adaptor-signature-based atomic swaps primarily:
 A. Require a trusted third party to complete the swap.
 B. Cannot support cross-chain swaps with different signature schemes.
 C. Provide strictly weaker privacy but lower on-chain footprint.
 D. Improve privacy and reduce on-chain footprint by embedding swap conditions into the signature relation instead of explicit on-chain scripts. *
[PHD]
 25. In an MPC-based custodial wallet, periodic “share refresh” protocols are mainly used to:
 A. Randomise and redistribute key shares without changing the underlying public key, limiting the damage of a gradual-share-leakage attacker. *
 B. Rotate to an entirely new public key on every transaction.
 C. Remove the need for secure channels between participants.
 D. Guarantee that no subset of parties can ever reconstruct the key, even above the threshold.
[PHD]
 26. Why are threshold Schnorr signatures generally considered simpler to implement than threshold ECDSA?
 A. Schnorr signatures require interactive signing, while ECDSA does not.
 B. Schnorr’s linear structure allows straightforward aggregation of partial signatures, whereas ECDSA’s multiplicative structure complicates secure nonce generation and combination. *
 C. ECDSA has a formal security proof in the random-oracle model but Schnorr does not.
 D. Threshold ECDSA does not require DKG, while Schnorr does.
[PHD]
 27. In Ethereum’s PoS, which pair of actions is slashable for a single validator?
 A. Attesting to two different blocks at different epochs.
 B. Proposing a block that omits a high-fee transaction.
 C. Attesting to two conflicting blocks for the same target epoch (double vote) or surrounding a previous vote with a newer one (surround vote). *
 D. Remaining offline for more than one week.
[PHD]
 28. For an optimistic cross-chain bridge that relies on proof-of-state rather than price feeds, what event should primarily trigger a dispute?
 A. A sudden change in L1 gas prices.
 B. A drop in the destination chain’s validator participation rate.
 C. The bridge token price deviating from its oracle feed.
 D. A relayed state root or inclusion proof that does not match the canonical source-chain header sequence. *
[PHD]
 29. In advanced smart-contract audits, “property-based fuzzing” tools such as Echidna or Foundry’s invariant tests are primarily used to:
 A. Randomly search for inputs that violate specified safety invariants or properties over many execution traces. *
 B. Exhaustively explore all possible program paths for a given gas limit.
 C. Prove functional correctness of the entire contract using symbolic execution.
 D. Benchmark gas efficiency of each public function.
[PHD]
 30. In modular architectures, data-availability (DA) layers like Celestia primarily differentiate themselves from monolithic L1s by:
 A. Removing consensus entirely and only storing raw blobs.
 B. Specialising in ordering and publishing transaction data without executing transactions, letting execution happen on separate rollups or sovereign chains. *
 C. Replacing proof-of-stake with proof-of-work to secure data.
 D. Only supporting private, encrypted data blobs.
[PHD]
 31. Compared with VRF-based randomness beacons, verifiable delay functions (VDFs) are particularly attractive because they:
 A. Allow unbounded parallelism, making evaluation arbitrarily fast.
 B. Can only be implemented using pairing-friendly curves.
 C. Provide sequential work guarantees, making it hard for adversaries with parallel hardware to bias or predict outputs ahead of honest participants. *
 D. Require no public parameters or setup.
[PHD]
 32. When considering migration to post-quantum signatures on a high-throughput blockchain, which challenge is especially acute for lattice-based schemes like Dilithium compared with BLS?
 A. Lack of formal security reductions under standard assumptions.
 B. Inability to support hierarchical key derivation.
 C. Incompatibility with account-based state models.
 D. Much larger public keys and signatures, leading to significant bandwidth and storage overhead for block propagation and state. *
[PHD]
 33. Recursive proof composition in rollup provers is mainly used to:
 A. Aggregate many per-batch proofs into a single succinct proof that the L1 can verify efficiently. *
 B. Prevent MEV extraction by builders.
 C. Remove the need for a data-availability layer.
 D. Guarantee that provers are stateless.
[PHD]
 34. In a multi-prover validity-rollup design, a key reason to have several independent prover implementations is to:
 A. Increase the size of each individual proof, making forgery harder.
 B. Reduce the risk that a single implementation bug allows invalid proofs to be generated and accepted on-chain. *
 C. Decrease the economic cost of running provers by sharing trusted hardware.
 D. Ensure that only a committee majority can post state roots.
[PHD]
 35. A “sequencer auction” mechanism for rollups typically seeks to:
 A. Allocate sequencer rights on a strict round-robin schedule independent of stake.
 B. Centralise sequencing in a single trusted data centre with low latency.
 C. Sell short-term sequencing rights via auctions, allowing market-based selection while ideally keeping censorship resistance guarantees. *
 D. Replace L1 validators with L2 sequencers for consensus.
[PHD]
 36. An “inclusion list” proposal in PBS primarily aims to:
 A. Let builders remove low-fee transactions from blocks without penalty.
 B. Allow off-chain committees to veto certain transactions.
 C. Force all builders to include the same ordered list of transactions in every block.
 D. Give the proposer the ability to mandate inclusion of a small set of transactions, mitigating long-term censorship by builders. *
[PHD]
 37. Cluster analysis in blockchain forensics most commonly risks failure when:
 A. Heuristics such as common-input-ownership are invalidated by widespread use of collaborative transactions like CoinJoins and PayJoins. *
 B. Exchanges publish all of their internal address mappings.
 C. Users never consolidate UTXOs.
 D. All transactions use native SegWit outputs.
[PHD]
 38. A key challenge for “compliant privacy pools” (e.g., regulated mixers) is to:
 A. Eliminate zero-knowledge proofs entirely while preserving anonymity.
 B. Allow users to prove membership in a “clean” subset of deposits without revealing the specific deposit, balancing privacy with regulatory requirements. *
 C. Force all withdrawals to go through KYC’ed centralised exchanges.
 D. Ensure that deposit sizes are all unique to aid forensics.
[PHD]
 39. From a systemic-risk perspective, the main concern with a dominant liquid staking token (LST) on Ethereum is that:
 A. It necessarily lowers the total amount of ETH staked.
 B. It makes solo staking technically impossible.
 C. It concentrates both economic and governance power in a small set of operators, increasing correlated-slashing and governance-capture risks. *
 D. It prevents validators from participating in MEV auctions.
[PHD]
 40. Flash-loan-enabled governance attacks typically exploit:
 A. Under-collateralised stablecoin lending pools.
 B. Time-locked upgrade contracts that cannot be cancelled.
 C. The requirement that all governance tokens be non-transferable.
 D. Quorum rules based solely on token balances at the time of voting, allowing attackers to borrow voting power temporarily and push malicious proposals. *
[PHD]
 41. In intent-centric architectures for DEX trading, user “intents” primarily represent:
 A. High-level desired outcomes (e.g., swap X for at least Y of Z) that specialised solvers can satisfy via arbitrary routes and venues. *
 B. Raw signed transactions to be broadcast directly to L1.
 C. MEV-Boost bids from builders to proposers.
 D. Validator preferences for fork-choice rules.
[PHD]
 42. A “safety window” for accepting cross-chain messages is mainly designed to:
 A. Increase throughput by batching more messages per block.
 B. Wait for sufficient finality or confirmations on the source chain so that the probability of a reorg invalidating the message becomes negligible. *
 C. Reduce gas fees by delaying processing until congestion subsides.
 D. Allow relayers to selectively censor unprofitable messages.
[PHD]
 43. State expiry proposals for Ethereum typically aim to:
 A. Delete all historical block headers to reduce disk usage.
 B. Disallow contracts from using storage opcodes beyond a fixed limit.
 C. Prune inactive parts of the state while relying on proofs or archives for very old data, limiting long-term state growth. *
 D. Force all dApps to migrate to separate rollups.
[PHD]
 44. In KZG-based polynomial commitments, which failure would most directly compromise soundness if the trusted setup ceremony were subverted?
 A. The prover’s computation would become asymptotically slower than expected.
 B. The verifier would require interactive rounds with the prover.
 C. Proof sizes would grow logarithmically instead of remaining constant.
 D. A malicious participant controlling the trapdoor could craft convincing proofs for false polynomial identities. *
[PHD]
 45. In many STARK constructions, the FRI protocol is used primarily to:
 A. Test proximity of a function to a low-degree polynomial over a large domain, enabling succinct PCP-style proofs. *
 B. Generate randomness for the Fiat–Shamir transform.
 C. Provide a trusted setup for the commitment scheme.
 D. Compress multiple polynomial openings into a single evaluation.
[PHD]
 46. One practical advantage of PLONK-style proving systems over circuit-specific SNARKs like Groth16 is that PLONK:
 A. Has strictly smaller proof sizes in all deployments.
 B. Uses a universal or updatable structured reference string that can support many different circuits, reducing the need for per-circuit trusted setups. *
 C. Does not require FFTs over finite fields.
 D. Is information-theoretically zero-knowledge.
[PHD]
 47. Implementing non-native field arithmetic (e.g., secp256k1 operations inside a BN254-based SNARK) is expensive mainly because:
 A. It requires abandoning R1CS in favour of custom constraint systems.
 B. It forces the prover to run inside a trusted execution environment.
 C. Arithmetic in the target field must be emulated with many constraints over the SNARK field, dramatically increasing circuit size. *
 D. It cannot be batched across multiple operations.
[PHD]
 48. In a validity-rollup with on-chain data availability, which condition must hold for users to be able to reconstruct the rollup state independently of the operator?
 A. The operator must publish their proving key to L1.
 B. The L1 must store only Merkle roots of L2 state.
 C. The rollup must use account abstraction for all wallets.
 D. All state-transition-related data (or sufficient compressed encodings) must be published to L1 so that a full node can replay the state machine. *
[PHD]
 49. A realistic migration path for an existing ECDSA-based chain toward post-quantum signatures typically starts with:
 A. Introducing hybrid addresses or scripts that require both a classical and a post-quantum signature, so security relies on breaking both schemes simultaneously. *
 B. Immediately disabling all non-multisig transactions.
 C. Reissuing all coins on a brand new, incompatible chain.
 D. Replacing hash functions with longer outputs while leaving signatures unchanged.
[PHD]
 50. When oracles use trusted execution environments (TEEs) like SGX, remote attestation is mainly intended to:
 A. Eliminate the need for any consensus among oracles.
 B. Ensure that enclave code can mutate itself at runtime to avoid exploits.
 C. Prove to external verifiers that specific code is running inside genuine hardware with an expected configuration before they rely on its outputs. *
 D. Guarantee that side-channel attacks are cryptographically impossible.

[BITCOIN]
Who is the pseudonymous creator of Bitcoin?
A. Hal Finney
B. Nick Szabo
C. Satoshi Nakamoto *
D. Dorian Nakamoto

[BITCOIN]
In what year was the Bitcoin whitepaper, "Bitcoin: A Peer-to-Peer Electronic Cash System," released?
A. 2010
B. 2007
C. 2008 *
D. 2009

[BITCOIN]
What is the process called by which new Bitcoin is created and transactions are validated?
A. Staking
B. Forging
C. Mining *
D. Minting

[BITCOIN]
What is the maximum supply of Bitcoin that will ever exist?
A. 19 million
B. 21 million *
C. 42 million
D. Unlimited

[BITCOIN]
What consensus mechanism does Bitcoin primarily use?
A. Proof-of-Stake (PoS)
B. Delegated Proof-of-Stake (DPoS)
C. Proof-of-Work (PoW) *
D. Proof-ofAuthority (PoA)

[BITCOIN]
What is the smallest unit of Bitcoin, named after its creator?
A. Finney
B. Block
C. Satoshi *
D. Hash

[BITCOIN]
What is a 'halving' event in the context of Bitcoin mining rewards?
A. A doubling of the block size limit
B. A change in the mining difficulty
C. A 50% reduction in the reward for mining new blocks *
D. A 50% reduction in the total supply limit

[BITCOIN]
Which term describes the distributed ledger technology that Bitcoin is built upon?
A. Smart Contract
B. Directed Acyclic Graph (DAG)
C. Blockchain *
D. Cloud Computing

[BITCOIN]
What is the primary function of a Bitcoin wallet?
A. To store the actual BTC coins
B. To execute smart contracts
C. To store the private keys required to access and spend BTC *
D. To run a full node of the network

[BITCOIN]
What is a "genesis block"?
A. The last block ever to be mined
B. The very first block in the Bitcoin blockchain *
C. A block mined by Satoshi Nakamoto
D. A block containing an unusually large transaction

[BITCOIN]
What is the name of the upgrade that introduced the Segregated Witness (SegWit) protocol?
A. Taproot
B. P2SH
C. Schnorr
D. Soft Fork *

[BITCOIN]
What concept makes Bitcoin's transaction history transparent and publicly viewable?
A. Anonymity
B. Pseudonymity *
C. Sharding
D. Off-chain routing

[BITCOIN]
What is the approximate average block time for the Bitcoin network?
A. 1 minute
B. 30 seconds
C. 10 minutes *
D. 5 seconds

[BITCOIN]
What are 'confirmations' in a Bitcoin transaction?
A. The number of blocks in a transaction's memory pool
B. The number of nodes that verified the transaction
C. The number of blocks added to the blockchain since the transaction was included *
D. The number of private keys used to sign the transaction

[BITCOIN]
What is a 'node' in the Bitcoin network?
A. A user holding more than 10 BTC
B. A computer running the Bitcoin software and maintaining a copy of the blockchain *
C. A specialized ASIC mining machine
D. A smart contract

[BITCOIN]
What term is used for a proposed change to the Bitcoin protocol?
A. BTC Improvement Proposal (BIP)
B. Bitcoin Improvement Proposal (BIP) *
C. Core Developer Update (CDU)
D. SegWit

[BITCOIN]
What is a 'private key' used for in relation to a Bitcoin wallet?
A. To view the public transaction history
B. To encrypt the wallet software
C. To sign transactions, proving ownership of the funds *
D. To generate the public address

[BITCOIN]
What is the Lightning Network designed to solve for Bitcoin?
A. Scalability and microtransactions *
B. The transition to Proof-of-Stake
C. Improving privacy on the base layer
D. Decentralizing mining pools

[BITCOIN]
Which country was the first to adopt Bitcoin as legal tender?
A. Panama
B. Switzerland
C. El Salvador *
D. Japan

[BITCOIN]
What year did the first halving event occur?
A. 2010
B. 2012 *
C. 2014
D. 2016

[BITCOIN]
What is the significance of the phrase "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks" found in the Genesis Block?
A. It was a random quote from the newspaper
B. It was a technical message for developers
C. It was a prediction of the 2008 financial crisis
D. It serves as a timestamp and commentary on the need for decentralized currency *

[BITCOIN]
How do Bitcoin fees typically work?
A. They are a fixed percentage of the transaction amount
B. They are fixed in USD value
C. They are calculated based on the computational complexity of the transaction
D. They are based on the size (in bytes) of the transaction data and network congestion *

[BITCOIN]
What is the difference between Bitcoin (BTC) and Bitcoin Cash (BCH)?
A. BCH uses Proof-of-Stake, while BTC uses Proof-of-Work
B. BCH forked from BTC to increase the block size limit *
C. BTC has a smaller maximum supply than BCH
D. BCH introduced smart contract functionality, which BTC lacks

[BITCOIN]
What does "HODL" mean in the Bitcoin community?
A. Hold On for Dear Life
B. Highly Optimized Digital Ledger
C. Harvesting Open Data Lines
D. A misspelling of 'hold' that became a rallying cry for keeping coins *

[BITCOIN]
What is a "mempool"?
A. The collective of all Bitcoin miners
B. The section of the blockchain reserved for small transactions
C. A waiting area for unconfirmed transactions before they are included in a block *
D. A type of mining hardware

[BITCOIN]
What term describes a Bitcoin address that has not moved its funds for a long period?
A. Dormant Whale
B. Sleeper Wallet *
C. Cold Storage
D. Locked Address

[BITCOIN]
Which metric is often used to measure the security and processing power of the Bitcoin network?
A. Market Capitalization
B. Block Height
C. Hash Rate *
D. Transaction Volume

[BITCOIN]
What is an 'unspent transaction output' (UTXO)?
A. The change received from a transaction
B. A transaction that failed to confirm
C. The record of Bitcoin from a previous transaction that is available to be spent *
D. A block that was rejected by the network

[BITCOIN]
What is a 'full node'?
A. A node that exclusively validates transactions
B. A computer that stores the entire copy of the blockchain and verifies all transactions *
C. A node run by a cryptocurrency exchange
D. A device used for hardware wallet security

[BITCOIN]
Who was the recipient of the first-ever Bitcoin transaction?
A. Satoshi Nakamoto
B. Craig Wright
C. Hal Finney *
D. Nick Szabo

Ethereum (ETH)
[ETHEREUM]
Who is considered the primary founder of Ethereum?
A. Gavin Wood
B. Charles Hoskinson
C. Joseph Lubin
D. Vitalik Buterin *

[ETHEREUM]
What is the native cryptocurrency and 'gas' token of the Ethereum network?
A. Ether Classic (ETC)
B. ERC-20
C. Ether (ETH) *
D. Wei

[ETHEREUM]
What is the name of the core upgrade that transitioned Ethereum's consensus from Proof-of-Work to Proof-of-Stake?
A. Metropolis
B. Shanghai
C. The Merge *
D. Homestead

[ETHEREUM]
What is a 'smart contract' on the Ethereum network?
A. A financial agreement written on a physical contract
B. A self-executing contract with the terms of the agreement directly written into code *
C. A legal document stored on the blockchain
D. A non-fungible token (NFT)

[ETHEREUM]
What does EVM stand for?
A. Enterprise Validation Mechanism
B. Extended Virtual Memory
C. Ethereum Validation Manager
D. Ethereum Virtual Machine *

[ETHEREUM]
What programming language is commonly used to write Ethereum smart contracts?
A. Python
B. C++
C. Rust
D. Solidity *

[ETHEREUM]
What term is used for the fee paid to execute a transaction or a smart contract on Ethereum?
A. Fuel
B. Bribe
C. Gas *
D. Toll

[ETHEREUM]
What are tokens built to a specific technical standard on Ethereum called (e.g., those for fungible tokens)?
A. E-Tokens
B. ERC-20 *
C. BEP-20
D. TRC-20

[ETHEREUM]
What is 'sharding,' a scaling solution planned for Ethereum?
A. Increasing the block size
B. Moving all transactions off-chain
C. Dividing the blockchain into multiple smaller chains (shards) to process transactions in parallel *
D. Changing the base cryptographic hash function

[ETHEREUM]
What is the purpose of the Ethereum Virtual Machine (EVM)?
A. To handle the Proof-of-Stake mechanism
B. To manage user accounts and wallets
C. To execute smart contract code in a decentralized environment *
D. To connect Ethereum to other blockchains

[ETHEREUM]
Which major industry development is Ethereum credited with pioneering, beyond just currency?
A. Peer-to-Peer File Sharing
B. Decentralized Applications (dApps) and Smart Contracts *
C. Anonymous Payments
D. Quantum-Proof Cryptography

[ETHEREUM]
What is 'Wei'?
A. The largest unit of ETH
B. A type of Ethereum scaling solution
C. The smallest unit of Ether, equal to 10−18 ETH *
D. A programming language for the EVM

[ETHEREUM]
What is a 'decentralized application' (dApp)?
A. An application run on a centralized server
B. An application whose backend code runs on a decentralized peer-to-peer network (like a blockchain) *
C. A mobile application that accepts crypto payments
D. A new type of web browser

[ETHEREUM]
What is 'staking' on the Ethereum network?
A. Locking up ETH to provide liquidity for trading
B. Locking up ETH to become a validator, secure the network, and earn rewards *
C. Using ETH to purchase NFTs
D. Mining ETH using specialized hardware

[ETHEREUM]
What is the name of the first major testnet that ran the Proof-of-Stake consensus?
A. Ropsten
B. Goerli
C. Sepolia
D. Beacon Chain *

[ETHEREUM]
What is Etherscan?
A. A type of Ethereum wallet
B. A Layer-2 scaling solution
C. A block explorer used to view transactions and smart contracts on the Ethereum blockchain *
D. The official name of the Ethereum staking pool

[ETHEREUM]
What mechanism controls the maximum amount of gas a transaction can consume?
A. Gas Price
B. Max Fee
C. Gas Limit *
D. Base Fee

[ETHEREUM]
What is the 'Beacon Chain'?
A. The main execution layer of Ethereum
B. The Proof-of-Stake coordination chain that runs parallel to the original chain and manages validators *
C. A Layer-2 network for fast transactions
D. The security layer for all smart contracts

[ETHEREUM]
What does the term 'Layer 2' refer to in the context of Ethereum?
A. The original Proof-of-Work blockchain
B. A separate blockchain or protocol built on top of Ethereum to improve speed and scale *
C. The governance structure of the Ethereum Foundation
D. The user interface for Ethereum dApps

[ETHEREUM]
What is MEV (Maximal Extractable Value)?
A. The maximum value a validator can stake
B. The maximum fee that can be extracted from a user
C. The profit a validator can make by arbitrarily including, excluding, or reordering transactions within a block *
D. The maximum supply of ETH

[ETHEREUM]
What is an ERC-20 token?
A. A non-fungible token standard
B. A standard for creating fungible (interchangeable) tokens on the Ethereum network *
C. The smart contract that manages the ETH supply
D. A type of privacy-focused transaction

[ETHEREUM]
What is the EIP-1559 proposal famous for introducing?
A. The transition to Proof-of-Stake
B. Support for sharding
C. A fee mechanism that burns a portion of the transaction fees (Base Fee) *
D. The introduction of the ERC-721 standard

[ETHEREUM]
What are 'rollups' (e.g., Optimistic and ZK) in the context of Ethereum scaling?
A. A type of Ethereum mining hardware
B. Layer-2 scaling solutions that bundle or 'rollup' many transactions off-chain into a single transaction on the main chain *
C. A new type of consensus algorithm
D. The process of staking ETH

[ETHEREUM]
What is the current consensus mechanism used by Ethereum after The Merge?
A. Proof-of-Work
B. Delegated Proof-of-Stake
C. Proof-of-Stake *
D. Proof-of-Authority

[ETHEREUM]
What is a DAO (Decentralized Autonomous Organization) often built on Ethereum?
A. A major cryptocurrency exchange
B. An organization governed by code and managed by its token holders, without central leadership *
C. A highly centralized investment fund
D. A new type of cryptocurrency wallet

[ETHEREUM]
What is the process of a new block being added to the Ethereum chain called?
A. Mining
B. Forging
C. Proposing/Attesting *
D. Compiling

[ETHEREUM]
Name a popular browser-based wallet used to interact with the Ethereum network and dApps.
A. Ledger Live
B. MetaMask *
C. Trust Wallet
D. Exodus

[ETHEREUM]
What is 'token burning' in relation to ETH supply?
A. A malicious act that destroys user funds
B. The transfer of ETH to a miner's address
C. The permanent removal of ETH from circulation, often by sending it to an unspendable address *
D. The creation of new tokens

[ETHEREUM]
What is the difference between a 'user-controlled account' and a 'contract account' on Ethereum?
A. User accounts can only hold ETH, contract accounts can hold tokens
B. Contract accounts use private keys, user accounts do not
C. User accounts are controlled by private keys, contract accounts are controlled by their code *
D. There is no difference; they are interchangeable

[ETHEREUM]
Which blockchain innovation allows the development of multiple, independent virtual machines for computation?
A. State Channels
B. Rollups
C. The EVM (Ethereum Virtual Machine) *
D. Zero-Knowledge Proofs

Solana (SOL)
[SOLANA]
Who is the co-founder and CEO of Solana Labs?
A. Vitalik Buterin
B. Changpeng Zhao (CZ)
C. Anatoly Yakovenko *
D. Sam Bankman-Fried

[SOLANA]
What is the native token of the Solana blockchain?
A. SPL
B. SOLana
C. SOL *
D. SAM

[SOLANA]
What is Solana's unique consensus mechanism that differentiates it from others?
A. Proof-of-Work (PoW)
B. Proof-of-Stake (PoS)
C. Proof-of-History (PoH) combined with Proof-of-Stake *
D. Delegated Proof-of-Stake (DPoS)

[SOLANA]
What does the 'PoH' in Solana's Proof-of-History stand for?
A. Proof of Hash
B. Proof of High-Throughput
C. Proof of History *
D. Proof of Hardware

[SOLANA]
What is a key benefit of Solana's architecture in terms of transaction speed?
A. It only allows small transactions
B. It runs all transactions through a single central server
C. Its ability to process transactions in parallel *
D. It uses a fixed gas price mechanism

[SOLANA]
What is the primary role of the SOL token on the network?
A. To represent governance rights only
B. To be used as a collateral asset for loans
C. To pay transaction fees (gas) and for staking to secure the network *
D. To act as a perpetual futures contract

[SOLANA]
Solana is often referred to as a "Layer 1" blockchain; what does this term mean?
A. It is the first blockchain ever created
B. It is a secondary network built on top of another chain
C. It is an independent, base-layer blockchain with its own security and consensus *
D. It only supports one type of token

[SOLANA]
What programming language is primarily used for developing on Solana?
A. Solidity
B. Python
C. Rust *
D. Java

[SOLANA]
Name a popular crypto wallet specifically designed for the Solana ecosystem.
A. MetaMask
B. Phantom *
C. Trust Wallet
D. Exodus

[SOLANA]
What are 'clusters' in the Solana network?
A. Groups of users staking together
B. Groups of validators that work together to serve client traffic *
C. A type of Solana-based NFT collection
D. The smart contracts running on Solana

[SOLANA]
What is a known criticism or challenge faced by the Solana network regarding its decentralization?
A. Relatively centralized validation set compared to Ethereum/Bitcoin *
B. High hardware requirements for running a node
C. Inability to support smart contracts
D. Lack of development tools

[SOLANA]
What are 'fees' on Solana often referred to as, similar to other chains?
A. Tip
B. Gas *
C. Tax
D. Tariff

[SOLANA]
What is the function of 'Turbine' in the Solana architecture?
A. The main block explorer
B. A block propagation protocol that breaks blocks into smaller pieces for efficient validator communication *
C. A type of decentralized exchange (DEX)
D. The Solana Virtual Machine (SVM)

[SOLANA]
What is the term for a user who locks up their SOL to help secure the network?
A. Miner
B. Auditor
C. Delegator
D. Staker/Validator *

[SOLANA]
Solana supports what type of smart contracts, allowing for high-performance dApps?
A. EVM-compatible contracts
B. Zero-Knowledge contracts
C. Rust-based smart contracts *
D. Bitcoin Script contracts

[SOLANA]
Where did the name 'Solana' originate?
A. A combination of 'solar' and 'network'
B. A beach where Anatoly Yakovenko lived and worked on the project *
C. A mythical creature in Greek legend
D. The original name of the development company

[SOLANA]
What is 'Sealevel' in the Solana architecture?
A. The process of monitoring network congestion
B. A parallel smart contracts run-time environment that enables concurrent execution *
C. The cryptographic hash function used
D. The maximum supply of SOL

[SOLANA]
What is the smallest unit of SOL called?
A. Wei
B. Nano
C. Lamport *
D. Kilo

[SOLANA]
What is the name of the program that handles ledger updates and block production?
A. Solana Engine
B. Tower BFT *
C. The Cluster Manager
D. The Archiver

[SOLANA]
What is the typical transaction fee on Solana, in terms of its comparison to Ethereum?
A. Significantly higher
B. About the same
C. Significantly lower (often fractions of a cent) *
D. Fees are paid in USDC only

[SOLANA]
What is a 'Validator' on the Solana network?
A. A full node that proposes and votes on new blocks to secure the chain *
B. A developer who writes smart contracts
C. A token holder who delegates their SOL
D. A liquidity provider

[SOLANA]
What is the maximum possible throughput (TPS) that Solana claims to be able to handle?
A. Around 100 TPS
B. Up to 1,000 TPS
C. Tens of thousands of transactions per second (often cited at 50,000+ theoretical) *
D. A fixed 10,000 TPS

[SOLANA]
What is the term for a temporary shutdown or halt of the Solana network?
A. A fork
B. An outage/halt *
C. A rollback
D. A hard fork

[SOLANA]
What is the Solana Program Library (SPL)?
A. A collection of Solana NFTs
B. A collection of on-chain programs (like token standards) for the Solana blockchain *
C. The official whitepaper documentation
D. The Solana block explorer

[SOLANA]
What does the 'Tower BFT' consensus mechanism do?
A. It controls the network's liquidity pools
B. It manages the token's circulating supply
C. It is a PoS version of Practical Byzantine Fault Tolerance (PBFT), leveraging Proof-of-History *
D. It executes the smart contracts

[SOLANA]
What is the role of the 'Archivers' on the Solana network?
A. They are the same as validators
B. They are nodes that store the ledger data (historical state) and are compensated for doing so *
C. They are the developers of the core protocol
D. They run the decentralized applications

[SOLANA]
What feature allows Solana to execute thousands of smart contracts in parallel?
A. Its low transaction fees
B. The Proof-of-Work mechanism
C. Sealevel (parallel smart contracts run-time) *
D. The use of the SPL token standard

[SOLANA]
What is an advantage of Solana's 'Account Model' over Ethereum's?
A. It separates code and state into different accounts, allowing programs to be read and executed concurrently *
B. It only supports one account per user
C. It only uses transparent accounts
D. It uses a fixed account size

[SOLANA]
What is 'Metaplex' in the Solana ecosystem?
A. The official Solana wallet
B. The name of the core validator client
C. A protocol for creating, minting, and trading NFTs (Non-Fungible Tokens) *
D. A bridge to connect Solana to other chains

[SOLANA]
What term describes Solana's ability to handle high transaction volume?
A. Availability
B. Integrity
C. Security
D. Scalability *

BNB (BNB)
[BNB]
What is the full name of the organization that initially launched BNB?
A. Binance Smart Chain
B. Binance (now part of the BNB Chain Ecosystem) *
C. Bank of North Beijing
D. Block N' Bytes

[BNB]
What was BNB originally used for on the Binance exchange?
A. As a stablecoin pegged to USD
B. To pay for trading fees at a discount *
C. As collateral for margin trading only
D. To purchase new listings

[BNB]
What are the two main blockchains that make up the BNB Chain ecosystem (excluding Layer-2s)?
A. BNB Proof Chain and BNB Smart Chain
B. BNB Beacon Chain (Governance/Staking) and BNB Smart Chain (EVM/dApps) *
C. BNB Core and BNB Ecosystem
D. BNB Chain and BNB Layer

[BNB]
What is the consensus mechanism used by the BNB Smart Chain (BSC)?
A. Proof-of-Work (PoW)
B. Pure Proof-of-Stake (PPoS)
C. Proof of Staked Authority (PoSA) *
D. Delegated Proof-of-Stake (DPoS)

[BNB]
What is the primary role of the BNB token within the BNB Smart Chain (BSC)?
A. Only as a governance token
B. To purchase physical goods
C. To pay for transaction (gas) fees and to participate in the PoSA consensus *
D. To serve as a collateral-backed stablecoin

[BNB]
What does the acronym 'BSC' stand for?
A. Binance Staking Coin
B. Basic Smart Contract
C. BNB Smart Chain *
D. Block Security Council

[BNB]
BNB was initially launched on which other blockchain as an ERC-20 token?
A. Solana
B. TRON
C. Ethereum *
D. Bitcoin

[BNB]
What feature does BNB use to reduce its total supply over time?
A. A continuous, fixed emission schedule
B. A fixed annual supply increase
C. Quarterly burning events, where a portion of Binance's profit is used to buy back and destroy BNB *
D. Automated deflationary governance votes

[BNB]
What is the 'BNB Beacon Chain' primarily used for?
A. Executing smart contracts
B. Staking and governance voting for the BNB Chain ecosystem *
C. Running layer-2 rollups
D. Facilitating cross-chain asset transfers

[BNB]
What kind of applications (dApps) are primarily run on the BNB Smart Chain?
A. Only centralized, corporate applications
B. Only non-EVM compatible applications
C. EVM-compatible decentralized applications (dApps), especially in DeFi and gaming *
D. Bitcoin layer-2 solutions

[BNB]
What is the main advantage of the BNB Smart Chain compared to Ethereum in terms of transaction fees?
A. It has fixed, non-variable fees
B. It charges fees in its native stablecoin
C. It generally has much lower transaction fees *
D. It does not charge any transaction fees

[BNB]
What type of blockchain compatibility does the BNB Smart Chain possess?
A. Bitcoin Script compatible
B. Solana Program Library compatible
C. Ethereum Virtual Machine (EVM) compatible *
D. TRON Virtual Machine compatible

[BNB]
Who is the founder of Binance, often associated with BNB?
A. Brian Armstrong
B. Changpeng Zhao (CZ) *
C. Gavin Wood
D. Justin Sun

[BNB]
What is the term for the set of validators who secure the BNB Smart Chain?
A. Guardians
B. Validators/Delegators *
C. Super Representatives
D. Miners

[BNB]
What mechanism is used to determine which transactions are processed next on BSC?
A. First-come, first-served
B. Random selection
C. Priority based on the gas price offered *
D. A democratic vote by all users

[BNB]
What is 'Trust Wallet' in the context of the BNB ecosystem?
A. A centralized exchange owned by Binance
B. The official block explorer
C. The official decentralized, multi-coin wallet acquired by Binance *
D. A Layer-2 scaling solution

[BNB]
What is the purpose of the 'Pilot' mechanism on the BNB Chain?
A. To manage the token supply
B. To allow validators to process parallel transactions for increased throughput *
C. To govern the staking rewards
D. To run the Binance centralized exchange

[BNB]
What is a key benefit of the Proof of Staked Authority (PoSA) consensus?
A. Extremely high decentralization
B. Requires very high computing power
C. High transaction speed and low transaction cost *
D. Total anonymity for all transactions

[BNB]
What is the current target supply of BNB after all burn events are completed?
A. 200 million BNB
B. 165 million BNB
C. 100 million BNB *
D. Unlimited supply

[BNB]
What is the latest layer-2 scaling solution introduced to the BNB Chain?
A. BNB Light
B. BNB ZK-Rollup
C. opBNB (Optimistic Rollup) *
D. BNB State Channel

[BNB]
What is 'staking' with BNB on the BNB Chain?
A. Locking up BNB to earn trading fee discounts
B. Delegating BNB to a validator on the Beacon Chain to earn rewards and secure the network *
C. Using BNB as a base currency for all dApps
D. Burning BNB to reduce supply

[BNB]
What is the term for the network upgrade that merged the two main BNB chains?
A. BNB Merge
B. BNB Chain Fusion *
C. BNB Smart Update
D. BNB Core

[BNB]
What is the term for a token standard frequently used on the BNB Smart Chain?
A. ERC-20
B. TRC-20
C. BEP-20 *
D. SPL

[BNB]
What is a common way to transfer assets between the Beacon Chain and the Smart Chain?
A. A centralized bridge managed by Binance
B. A decentralized cross-chain communication mechanism *
C. Through a dedicated layer-2 rollup
D. By burning tokens on one chain and re-minting them on the other

[BNB]
How does the BNB Chain aim to maintain network security?
A. By having only one central server
B. By exclusively relying on Proof-of-Work mining
C. By having a limited set of professional validators who stake BNB and participate in PoSA *
D. By requiring all users to complete KYC

[BNB]
What is the name of Binance's venture capital arm that supports the BNB ecosystem?
A. Binance Labs
B. Binance Ventures *
C. BNB Chain Fund
D. BNB Inc.

[BNB]
What are 'BNB Vaults'?
A. Secure hardware wallets for BNB
B. A yield aggregator that allows BNB holders to earn from various DeFi products simultaneously *
C. The storage layer for the BNB Chain
D. The smart contracts for BNB burning

[BNB]
What does BNB Greenfield provide to the BNB ecosystem?
A. A new consensus mechanism
B. A decentralized storage network *
C. A privacy layer
D. A new development language

[BNB]
What is the primary focus of the BNB Chain's development roadmap?
A. Achieving quantum resistance
B. Massive scalability, high throughput, and multichain compatibility (MetaChain) *
C. Becoming the sole global payment system
D. Transitioning back to Proof-of-Work

[BNB]
What type of governance model is used for the BNB Chain?
A. Centralized, managed only by Binance
B. Community-driven, through the BNB Beacon Chain and staking votes *
C. Autonomous, with no human intervention
D. Governance is non-existent

PancakeSwap (CAKE)
[PANCAKESWAP]
What is the main function of PancakeSwap in the decentralized finance (DeFi) space?
A. A centralized lending platform
B. A Decentralized Exchange (DEX) and automated market maker (AMM) *
C. A major crypto wallet provider
D. A hardware mining company

[PANCAKESWAP]
What is the native governance and utility token of PancakeSwap?
A. WBNB
B. SYRUP
C. CAKE *
D. FLIP

[PANCAKESWAP]
On which major blockchain is PancakeSwap built and primarily operates?
A. Ethereum
B. Solana
C. BNB Smart Chain (BSC) *
D. TRON

[PANCAKESWAP]
What type of exchange model does PancakeSwap use?
A. Central Limit Order Book
B. Peer-to-Peer (P2P)
C. Automated Market Maker (AMM) *
D. Brokerage

[PANCAKESWAP]
What does the acronym 'AMM' stand for in the context of PancakeSwap?
A. Automated Money Manager
B. Automated Market Maker *
C. Asset Management Module
D. Anonymous Money Mixer

[PANCAKESWAP]
What is 'yield farming' on PancakeSwap?
A. Buying CAKE tokens on a centralized exchange
B. Providing liquidity to token pairs and staking the resulting LP tokens for CAKE rewards *
C. Trading perpetual contracts on the platform
D. Using a high-leverage loan to buy more CAKE

[PANCAKESWAP]
What is a 'Syrup Pool' on PancakeSwap?
A. A place to swap tokens
B. The contract that holds all CAKE tokens
C. A staking pool where users can stake CAKE to earn other tokens *
D. A governance voting mechanism

[PANCAKESWAP]
What does the term 'liquidity provider' mean on PancakeSwap?
A. A user who acts as a financial regulator
B. A user who borrows assets from the platform
C. A user who deposits a pair of tokens into a pool to facilitate trading *
D. A user who exclusively buys CAKE

[PANCAKESWAP]
What unique theme or motif does PancakeSwap use for its branding and features?
A. Marine life
B. Space exploration
C. Food/Breakfast items (e.g., Pancakes, Syrup, Waffles) *
D. Medieval fantasy

[PANCAKESWAP]
What is an 'LP Token' on PancakeSwap?
A. A low-priority token
B. A type of NFT
C. A token representing a user's proportional share of a liquidity pool *
D. The native governance token

[PANCAKESWAP]
How does PancakeSwap manage the total supply of the CAKE token?
A. It has a fixed, hard-capped total supply
B. It has an infinitely increasing supply
C. It is designed to be deflationary through a burning mechanism (destroying tokens) *
D. The supply is manually adjusted by the developers

[PANCAKESWAP]
What is the primary purpose of the 'IFO' feature on PancakeSwap?
A. Initial Financial Optimization
B. Initial Farm Offering (A method for new projects to launch their tokens) *
C. Internal Fraud Oversight
D. International Fund Operations

[PANCAKESWAP]
What is a 'governance vote' for CAKE holders?
A. A way to decide the price of CAKE
B. A centralized system to select the CEO
C. A mechanism allowing CAKE holders to propose and vote on changes to the protocol *
D. A daily lottery draw

[PANCAKESWAP]
What are 'Farms' on PancakeSwap used for?
A. Buying and selling land NFTs
B. Staking LP tokens to earn CAKE rewards *
C. Trading perpetual futures
D. Storing historical transaction data

[PANCAKESWAP]
What is the name of PancakeSwap's NFT feature?
A. NFT Syrup
B. PancakeSwap Collectibles *
C. CakePunks
D. BNB Apes

[PANCAKESWAP]
What is the primary risk associated with providing liquidity in an AMM like PancakeSwap?
A. Losing all funds to hackers
B. High fixed transaction fees
C. Impermanent Loss (IL) *
D. Liquidity Provider Lock-up (LPL)

[PANCAKESWAP]
What does PancakeSwap use to match buyers and sellers?
A. A traditional order book
B. Mathematical formulas (Automated Market Maker) *
C. Centralized brokers
D. A complex matching engine run by validators

[PANCAKESWAP]
What is the main utility of CAKE beyond governance and staking?
A. It is the official stablecoin
B. It can only be used to pay for gas fees
C. It is earned as a reward for providing liquidity and used in IFOs *
D. It is exclusively used for margin trading

[PANCAKESWAP]
What is 'Auto-CAKE'?
A. A feature that automatically sells all your CAKE
B. A staking pool that automatically harvests and compounds CAKE rewards *
C. A centralized system for buying CAKE
D. The contract that manages the CAKE supply

[PANCAKESWAP]
What is the term for the portion of transaction fees distributed to liquidity providers?
A. Gas Refund
B. Tax Fee
C. Trading Fee Revenue *
D. Staking Reward

[PANCAKESWAP]
What is the purpose of PancakeSwap's 'Prediction' market feature?
A. To forecast the weather
B. To bet on whether the price of BNB (or other tokens) will go up or down *
C. To predict the winner of a governance vote
D. To forecast the next token to be listed

[PANCAKESWAP]
What is a common method for new projects to launch their tokens on PancakeSwap?
A. Initial Farm Offering (IFO) *
B. Initial Coin Offering (ICO)
C. Token Burn Event
D. Centralized Exchange Listing

[PANCAKESWAP]
What does the 'V3' in PancakeSwap V3 refer to?
A. The third chain it operates on
B. The third major iteration of the Automated Market Maker (AMM) contracts *
C. The version of its wallet
D. The governance voting mechanism

[PANCAKESWAP]
What are 'Trading Fees' on PancakeSwap used for?
A. Paying back liquidity providers, burning CAKE, and funding the treasury *
B. Funding the BNB Smart Chain validators
C. Covering the cost of the smart contract audit
D. Paying the developers a fixed salary

[PANCAKESWAP]
What is the role of the 'MasterChef' contract?
A. The governance contract that holds all voting data
B. The primary contract that manages the Farms and distributes CAKE rewards to liquidity providers *
C. The contract that executes token swaps
D. The contract that holds the CAKE token supply

[PANCAKESWAP]
What is PancakeSwap's lottery feature?
A. A way to win free BNB
B. A chance to win a large CAKE prize pool by matching numbers on a ticket *
C. A random CAKE giveaway to all stakers
D. A daily token burn event

[PANCAKESWAP]
What is 'Impermanent Loss'?
A. A permanent loss of the LP tokens
B. The temporary, unrealized loss of funds a user experiences by providing liquidity compared to simply holding the tokens *
C. The loss of funds due to high transaction fees
D. The loss of staking rewards

[PANCAKESWAP]
How is the PancakeSwap team typically referred to?
A. The Core Developers
B. The Chefs
C. The Anonymous Team * 
D. The BNB Chain Council

[PANCAKESWAP]
What is the tool used on PancakeSwap to swap one token for another?
A. The Farm
B. The Pool
C. The Exchange/Swap Interface *
D. The Lottery

[PANCAKESWAP]
What is the main security measure used by PancakeSwap's smart contracts?
A. Centralized Authority
B. Open-source code and independent security audits *
C. Proof-of-Work mining
D. KYC requirements

TRON (TRX)
[TRON]
Who is the founder of TRON?
A. Vitalik Buterin
B. Justin Sun *
C. Gavin Wood
D. Changpeng Zhao (CZ)

[TRON]
What is the native cryptocurrency of the TRON blockchain?
A. TRON Coin (TRC)
B. TRONIX (TRX) *
C. Tether (USDT)
D. BitTorrent Token (BTT)

[TRON]
What type of digital content is the TRON network primarily designed to support?
A. Financial derivatives only
B. Decentralized content sharing and entertainment *
C. Industrial supply chain management
D. Anonymous transactions

[TRON]
What is the consensus mechanism used by TRON?
A. Proof-of-Work (PoW)
B. Proof-of-Stake (PoS)
C. Delegated Proof-of-Stake (DPoS) *
D. Proof-of-Authority (PoA)

[TRON]
What does the 'DPoS' in TRON's Delegated Proof-of-Stake stand for?
A. Distributed Protocol Off-chain Solution
B. Digital Proof of Security
C. Delegated Proof-of-Stake *
D. Decentralized Protocol Operating System

[TRON]
What is a 'Super Representative' on the TRON network?
A. A user who holds the most TRX
B. A publicly elected node that validates transactions and produces blocks *
C. A TRON employee
D. A smart contract developer

[TRON]
What is the name of TRON's first and most popular blockchain explorer?
A. Etherscan
B. Solscan
C. TRONSCAN *
D. TronExplorer

[TRON]
What is the primary benefit of TRON's architecture in terms of transaction fees?
A. Fixed, high transaction fees
B. Fees are paid in the form of US dollars
C. Very low or even zero transaction fees when using Bandwidth/Energy *
D. Fees are paid only in Bitcoin

[TRON]
Which major stablecoin has a large circulating supply on the TRON network?
A. USDC
B. BUSD
C. DAI
D. USDT (Tether) *

[TRON]
What is 'TRON Power (TP)'?
A. A measure of mining hash rate
B. The locked TRX that grants users voting rights for Super Representatives *
C. The energy required to execute a smart contract
D. The total market capitalization of all TRON-based tokens

[TRON]
What is the token standard for fungible tokens on TRON, similar to Ethereum's ERC-20?
A. TRON-20
B. TRC-20 *
C. TRC-721
D. TRON-X

[TRON]
What is 'bandwidth' on the TRON network used for?
A. To cover the cost of regular TRX transfers (non-smart contract transactions) *
B. To power the mining algorithm
C. To pay for data storage
D. To run the TRON Virtual Machine (TVM)

[TRON]
What is the term for a user who locks up their TRX to gain voting rights?
A. Forger
B. Freezer/Staker *
C. Miner
D. Representative

[TRON]
What kind of real-world assets did Justin Sun notably acquire and donate to the APENFT Foundation?
A. Gold and Silver Bullion
B. High-value artwork and NFTs *
C. Real estate properties
D. Shares in major tech companies

[TRON]
What is 'SunSwap'?
A. TRON's official lending platform
B. The original name of the TRON blockchain
C. TRON's Automated Market Maker (AMM) Decentralized Exchange (DEX) *
D. A cross-chain bridge

[TRON]
What is the main purpose of the TRON DAO?
A. To serve as the marketing arm of TRON
B. To manage the centralized exchange
C. To enable community governance and management of the ecosystem *
D. To host all smart contracts

[TRON]
What is the average block time on the TRON network?
A. 10 minutes
B. 13 seconds
C. 3 seconds *
D. Less than 1 second

[TRON]
How does the TRON network aim to achieve high transaction throughput (TPS)?
A. By using a single central validator
B. Through its DPoS consensus and the limited number of Super Representatives *
C. By utilizing Proof-of-Work with specialized ASIC miners
D. By only allowing small, simple transactions

[TRON]
What does the term 'energy' refer to on the TRON network?
A. The computing power of the mining hardware
B. The resource cost required to execute smart contracts *
C. The electrical usage of the Super Representatives
D. The heat generated by the network

[TRON]
What is the name of the programming language used for TRON smart contracts?
A. Solidity (compatible with EVM) *
B. FunC (TON's language)
C. Rust (Solana's language)
D. Python

[TRON]
What did the TRON Foundation restructure into in 2021?
A. A for-profit exchange
B. The TRON DAO (Decentralized Autonomous Organization) *
C. A purely centralized entity
D. The BitTorrent Company

[TRON]
What is 'BitTorrent (BTT)' in relation to the TRON ecosystem?
A. The official TRON wallet
B. A decentralized file-sharing protocol acquired by TRON, which also has a native token (BTT) *
C. A new TRON Layer-2 scaling solution
D. The consensus mechanism's official name

[TRON]
What is the main use case for 'TRC-10' tokens?
A. Non-Fungible Tokens
B. Simple tokens created at a low cost, often used for basic utility *
C. Complex smart contract tokens
D. Privacy-focused tokens

[TRON]
What is "T-R-X" often referred to as in the community?
A. TRON Exchange
B. TRONIX *
C. TRON X-ray
D. TRON Token

[TRON]
What is the name of the cross-chain protocol on TRON?
A. TronLink
B. TRON Bridge *
C. SunSwap Bridge
D. Interchain Communication Protocol (ICP)

[TRON]
What is 'TRON's Odyssey'?
A. The official name of the TRON network after the 2021 update
B. The name of the initial mainnet release phase of the TRON protocol *
C. The TRON block explorer
D. The TRON whitepaper

[TRON]
What is the smallest unit of the TRX token?
A. TronSat
B. Sun *
C. Wei
D. Satoshi

[TRON]
What is the concept behind 'Project Great Voyage'?
A. The plan to transition to Proof-of-Work
B. The initiative to attract more DeFi developers
C. The upgrade that introduced the TRON Virtual Machine (TVM) and smart contract support *
D. The plan to integrate with Solana

[TRON]
How does TRON handle governance and network changes?
A. Through a voting system by TRX holders who elect Super Representatives *
B. By a centralized board of directors
C. By an off-chain social media poll
D. Through an annual conference vote

[TRON]
What is a key feature that allows TRON to support a massive user base?
A. Its use of Proof-of-Work
B. High scalability and low transaction fees *
C. Its exclusive focus on anonymous transactions
D. It only supports one application

TON (The Open Network)
[TON]
Which major messaging application originally developed The Open Network (TON)?
A. WhatsApp
B. Signal
C. Telegram *
D. WeChat

[TON]
What is the native cryptocurrency of The Open Network?
A. GRAM
B. Toncoin (TON) *
C. OpenCoin
D. Telegram Coin

[TON]
What happened to the TON project after its initial development by the founding company?
A. It was sold to a major tech company
B. It was shut down entirely and the code was destroyed
C. It was forced to cease its original development/launch due to a legal injunction (SEC) and was taken over by a community of open-source developers *
D. It was merged with the Ethereum blockchain

[TON]
What is the consensus mechanism used by TON?
A. Proof-of-Work (PoW)
B. Delegated Proof-of-Stake (DPoS)
C. Proof-of-Stake (PoS) *
D. Proof-of-Authority (PoA)

[TON]
What does TON aim to be in terms of its architecture?
A. A single, monolithic blockchain
B. A simple layer-2 protocol
C. A "blockchain of blockchains" with a multi-level structure (Masterchain, Workchains, Shardchains) *
D. A centralized database

[TON]
What unique architecture does TON use to achieve high scalability?
A. Fixed block size
B. Dynamic Sharding *
C. Only off-chain transactions
D. A central authority to process transactions

[TON]
What is the TON DNS service designed for?
A. To assign human-readable names to blockchain accounts, websites, and smart contracts *
B. To manage the consensus mechanism
C. To run the full node software
D. To connect TON to other networks

[TON]
What is the relationship between TON and the messaging app's crypto wallet?
A. They are completely unrelated
B. The messaging app has integrated a self-custodial wallet that supports Toncoin *
C. The messaging app only supports Bitcoin
D. The TON development team works for the messaging app company

[TON]
What is the name of the service that allows users to store public and private data on TON?
A. TON Cloud
B. TON Files
C. TON Storage *
D. TON Backup

[TON]
What is the term for a temporary sub-blockchain within the TON architecture?
A. Workchain
B. Subchain
C. Shardchain *
D. Layer-2

[TON]
What is the primary role of Toncoin on the network?
A. To be used only as a governance token
B. To be exclusively used for buying in-app advertisements
C. To pay for transaction fees, staking, decentralized services (DNS/Storage), and governance *
D. To be a collateral asset for DeFi lending

[TON]
What is the purpose of the 'Dynamic Sharding' feature?
A. To randomly select transaction validators
B. To automatically split and merge shardchains based on transaction load to ensure performance *
C. To change the consensus mechanism dynamically
D. To manually control the block time

[TON]
What is a 'smart contract' on the TON network?
A. A centralized contract stored on a server
B. An account controlled by code that executes logic on the blockchain *
C. A simple data storage ledger
D. A legal document

[TON]
What are 'workchains' in the TON architecture?
A. Sub-chains that process parallel transactions
B. Separate blockchains (like different operating systems) that can interact via the Masterchain *
C. The mining pools on the network
D. The staking contracts

[TON]
How is new Toncoin typically introduced into the system?
A. Through Proof-of-Work mining
B. Through an Initial Coin Offering (ICO)
C. Through validator rewards from Proof-of-Stake consensus *
D. By a centralized token minting authority

[TON]
What is the advantage of TON's architecture for on-chain voting and governance?
A. It is entirely centralized
B. It does not allow for community input
C. The multi-level structure and fast communication enable efficient, high-speed on-chain governance *
D. It uses a fixed, manual voting system

[TON]
What is the significance of the TON project being transitioned to an open-source community?
A. It was abandoned by its original creators
B. It allowed a centralized entity to take over
C. It ensures the project remains decentralized, censorship-resistant, and community-driven *
D. It caused the token price to drop to zero

[TON]
What is 'staking' on the TON network?
A. The process of buying TON on an exchange
B. Locking up Toncoin to become a validator or delegator to secure the PoS network *
C. Using Toncoin to purchase NFTs
D. The process of burning Toncoin

[TON]
What is the name of the mechanism used for cross-chain communication on TON?
A. TON Warp
B. Instant Hypercube Routing *
C. TON Interop
D. Cross-chain Protocol (CCP)

[TON]
What is the transaction speed claim for The Open Network?
A. Similar to Bitcoin (7 TPS)
B. Similar to Ethereum (15-30 TPS)
C. Extremely high and adaptive (claimed to be capable of millions of TPS through sharding) *
D. A fixed 1,000 TPS

[TON]
What is the term for a transaction sent through the messaging app's crypto wallet?
A. Telegram Pay
B. Peer-to-Peer Transaction * 
C. On-chain only transaction
D. Centralized transaction

[TON]
What is the name of the programming language used for smart contracts on TON?
A. Solidity
B. Rust
C. FunC and Tact *
D. C++

[TON]
What does 'Gas' in the TON network represent?
A. The fixed transaction fee
B. The computational cost paid for transaction execution and smart contract storage *
C. The mining reward
D. The total network energy consumption

[TON]
How are governance decisions made on The Open Network?
A. By the original founder
B. Through community voting by Toncoin holders on various proposals *
C. By a committee of central banks
D. Automatically by the protocol code

[TON]
What is the main feature of TON Payments?
A. A centralized banking service
B. A simple wallet
C. A high-speed, off-chain payment network for microtransactions (similar to Lightning) *
D. A fixed-rate lending protocol

[TON]
What unique financial tool, integrated into the messaging app, helps to drive adoption of TON?
A. An NFT marketplace
B. A fixed-interest savings account
C. The integrated wallet that supports Toncoin *
D. A high-leverage trading platform

[TON]
What is the core principle of TON Proxy?
A. To execute smart contracts
B. To provide a decentralized VPN-like service, hiding IP addresses and protecting privacy *
C. To manage staking rewards
D. To run the consensus algorithm

[TON]
What is the smallest possible unit of Toncoin?
A. Satoshi
B. Giga-TON
C. Nano-TON *
D. Picoton

[TON]
What is the purpose of the TON Bridge?
A. To enable cross-chain transfer of assets and data between TON and other blockchains (like Ethereum and BNB Chain) *
B. To connect the Masterchain and Workchains
C. To facilitate Toncoin mining
D. To serve as the primary block explorer

[TON]
What is the name of the community that currently stewards the TON project?
A. Telegram Foundation
B. TON Core Developers
C. TON Foundation *
D. The Open Source Group

USDT (Tether)
[USDT]
What is the category of cryptocurrency that Tether (USDT) belongs to?
A. Exchange Token
B. Privacy Coin
C. Utility Token
D. Stablecoin *

[USDT]
What fiat currency is USDT pegged to?
A. Euro (EUR)
B. Japanese Yen (JPY)
C. United States Dollar (USD) *
D. British Pound (GBP)

[USDT]
What is the intended exchange rate between 1 USDT and the US dollar?
A. 1 USDT = $0.99 USD
B. 1 USDT = $1.01 USD
C. 1 USDT = $10.00 USD
D. 1 USDT = $1.00 USD *

[USDT]
What is the name of the company that issues Tether?
A. Circle
B. Binance
C. Tether Holdings Limited *
D. Paxos

[USDT]
What is the term for the collateral that Tether claims to hold to back the supply of USDT?
A. Decentralized assets only
B. Reserves (cash, commercial paper, treasury bills, etc.) *
C. Only Bitcoin and Ethereum
D. Gold and Silver Bullion only

[USDT]
On which blockchain was USDT originally launched?
A. Ethereum
B. Solana
C. Omni Layer (on Bitcoin's chain) *
D. TRON

[USDT]
What is the main purpose of a stablecoin like USDT for traders?
A. To earn high staking rewards
B. To provide complete transaction anonymity
C. To allow traders to move into a stable asset during volatility without converting to traditional fiat *
D. To be used for Proof-of-Work mining

[USDT]
On which two major blockchains does USDT have the largest circulating supply (as of recent data)?
A. Ethereum and Solana
B. Ethereum and TRON *
C. Bitcoin and Cardano
D. BNB Chain and Polygon

[USDT]
What is the primary risk associated with a centralized stablecoin like USDT?
A. The lack of a development team
B. Regulatory uncertainty and the risk that the collateral reserves may not fully back the issued tokens *
C. Its inability to be transferred across blockchains
D. High volatility compared to other cryptocurrencies

[USDT]
What is the term for the event when USDT's market price temporarily deviates from its peg?
A. Slippage
B. Depeg *
C. Black swan event
D. Halving

[USDT]
What are the two key mechanisms that Tether uses to maintain its peg?
A. Decentralized governance and smart contract fees
B. The ability for users to redeem/mint 1 USDT for $1 USD (Arbitrage) and the backing of its reserves *
C. Proof-of-Work mining and a fixed supply
D. Automated interest rate adjustments and liquidation

[USDT]
What is an 'attestation report' for Tether?
A. A legal document that transfers ownership
B. A third-party accounting report that aims to verify Tether's reserves *
C. A security audit of the smart contract
D. A report detailing its energy consumption

[USDT]
What is 'Commercial Paper' in the context of Tether's reserves?
A. Physical paper money held in a vault
B. A short-term, unsecured promissory note issued by corporations *
C. The original whitepaper
D. A decentralized lending contract

[USDT]
What are the most common token standards that USDT operates on across various blockchains?
A. TRC-10 and ERC-721
B. ERC-20 (Ethereum) and TRC-20 (TRON) *
C. BEP-20 and SPL
D. Omni and Bitcoin Script

[USDT]
What is a key benefit of using USDT for cross-border transactions compared to traditional banking?
A. Total transaction anonymity
B. Faster settlement and lower fees *
C. Guaranteed FDIC insurance
D. Exclusive use on one blockchain

[USDT]
What does the term 'minting' refer to for new USDT?
A. The destruction of existing USDT
B. The creation of new USDT tokens, typically when a user deposits USD to the issuer *
C. The process of staking USDT
D. The sale of USDT on an exchange

[USDT]
What does the process of 'redemption' involve for USDT holders?
A. Buying more USDT with crypto
B. Exchanging USDT back to the issuer for the equivalent amount of fiat currency ($1 USD) *
C. Voting on governance proposals
D. Swapping USDT for another stablecoin

[USDT]
What is a 'Blacklist' feature on USDT's smart contract?
A. A list of all USDT holders
B. A function that allows the issuer to freeze or prevent spending from specific wallet addresses *
C. A list of approved exchanges
D. A system for preventing stablecoin volatility

[USDT]
What regulatory scrutiny has Tether often faced?
A. Concerns over the composition and verification of its collateral reserves *
B. Regulatory bodies demanding it adopt Proof-of-Work
C. Antitrust claims for market dominance
D. Claims of being overly decentralized

[USDT]
What is a primary use case for USDT in the DeFi space?
A. As the gas token for smart contracts
B. Providing liquidity to decentralized exchanges and lending/borrowing protocols *
C. Serving as the governance token
D. Mining new blocks

[USDT]
What is the difference between a 'centralized' stablecoin like USDT and a 'decentralized' stablecoin like DAI?
A. USDT is backed by off-chain reserves (fiat/assets) and is issued by a company, while DAI is backed by on-chain crypto collateral and governed by a DAO *
B. USDT is fixed to $1, while DAI is variable
C. USDT can only be used on Ethereum, while DAI can be used anywhere
D. USDT uses Proof-of-Work, while DAI uses Proof-of-Stake

[USDT]
What does USDt stand for?
A. Universal Security Deposit
B. US Dollar Tether *
C. United Stable Dollar Token
D. Utility Security of Deposits

[USDT]
What is the official token symbol for Tether?
A. TETH
B. USDL
C. USDT *
D. TUSD

[USDT]
What is the significance of USDT's multi-chain deployment?
A. It complicates transactions and increases fees
B. It limits its use to only a few ecosystems
C. It enhances liquidity, reach, and user flexibility across multiple blockchain ecosystems *
D. It requires a new collateral pool for every chain

[USDT]
What is the process of 'burning' USDT?
A. Sending it to a trading bot
B. Destroying tokens to remove them from circulation, typically after a redemption for fiat *
C. Sending it to a decentralized exchange
D. Using it to pay for gas fees

[USDT]
What is the primary concern when considering the fungibility of USDT?
A. Its stability compared to the USD
B. Its high transaction fees
C. The potential for the issuer to 'blacklist' or freeze specific tokens/addresses, which affects their interchangeability *
D. Its difficulty in being moved between chains

[USDT]
What term describes a stablecoin that is backed by reserves held by a company?
A. Algorithmic
B. Fiat-collateralized *
C. Crypto-collateralized
D. Fully decentralized

[USDT]
When a trader uses USDT on a decentralized exchange, what is the role of the token?
A. It is the governance token
B. It is the Layer-2 scaling solution
C. It acts as a stable base pair for trading volatile assets (e.g., BTC/USDT) *
D. It is exclusively used for staking

[USDT]
Which layer-1 blockchain has often been used by USDT for fast, low-cost transactions, sometimes overtaking Ethereum in volume?
A. Solana
B. Cardano
C. TRON *
D. Polkadot

[USDT]
What is one of the most significant reasons for USDT's market dominance?
A. Its legal status as a bank
B. Its use of Proof-of-Work
C. Its first-mover advantage and deep integration into major exchanges and trading pairs *
D. Its absolute anonymity

NEAR (NEAR)
[NEAR]
What is the native token of the NEAR Protocol?
A. NEAT
B. NEAR *
C. NEP
D. NAT

[NEAR]
What is the core feature NEAR uses to achieve scalability, which involves dividing the network's state?
A. Merkle Tree Compression
B. Nightshade Sharding *
C. Proof-of-History
D. Delegated Proof-of-Stake

[NEAR]
What is the consensus mechanism used by NEAR Protocol, which is a variation of Proof-of-Stake?
A. Hyper BFT
B. Doomslug *
C. Tendermint
D. Proof-of-Authority

[NEAR]
What does the 'Nightshade' sharding design do?
A. It hides all transaction data
B. It links NEAR to the Bitcoin blockchain
C. It treats each shard's state as a fraction of a single blockchain state to enhance security and simplify cross-shard communication *
D. It only allows one shard to operate at a time

[NEAR]
What is one of the key usability features NEAR introduced regarding user accounts?
A. Only allowing anonymous accounts
B. Using human-readable account names instead of long alphanumeric strings (e.g., 'alice.near') *
C. Requiring a hardware wallet for every account
D. Requiring a high staking balance for account activation

[NEAR]
What is the Rainbow Bridge?
A. The governance mechanism for NEAR
B. A trustless bridge connecting the NEAR Protocol and Ethereum blockchains *
C. The official NEAR wallet
D. The NEAR block explorer

[NEAR]
How are transaction fees paid on the NEAR Protocol?
A. They are paid in Bitcoin
B. They are always fixed and free
C. They are paid in the NEAR token *
D. They are paid in a dedicated stablecoin

[NEAR]
What is a unique economic feature of NEAR that benefits dApp developers?
A. Developers can manually set the gas price to zero
B. A portion of the transaction fees (30%) is rebated back to the contract owner *
C. All fees are burned
D. The developer pays all the user's transaction fees

[NEAR]
What is the programming model used by NEAR to support multiple languages for smart contract development?
A. EVM only
B. Bitcoin Script only
C. WebAssembly (Wasm) *
D. Solidity only

[NEAR]
What is 'Chain Abstraction'?
A. A complex cryptographic technique
B. NEAR's vision to make the underlying blockchain invisible to the user, simplifying cross-chain transactions *
C. The process of migrating dApps to NEAR
D. A new type of sharding

[NEAR]
What is the term for the process where transaction costs on NEAR dynamically adjust based on network usage?
A. Fixed Pricing
B. Adaptive Pricing *
C. Supply-side pricing
D. Demand-side pricing

[NEAR]
What is the primary role of a 'Validator' on the NEAR network?
A. To write smart contracts
B. To run a node, stake NEAR, process transactions, and secure the network via the Doomslug consensus *
C. To trade on the decentralized exchange
D. To manage the NEAR Foundation

[NEAR]
What is the name of the official non-profit organization supporting the maintenance and development of the NEAR Protocol?
A. NEAR Labs
B. NEAR Foundation *
C. NEAR DAO
D. NEAR Core

[NEAR]
What are 'chunks' in the context of Nightshade Sharding?
A. Blocks on the Execution Layer
B. Data segments produced by each shard, which are aggregated into the main block by the block producer *
C. The smallest unit of the NEAR token
D. The smart contracts

[NEAR]
What is the main benefit of NEAR's block finality being fast (around 1-2 seconds)?
A. It increases mining rewards
B. It improves the user experience for dApps and trading, making interactions feel immediate *
C. It makes the network more centralized
D. It reduces the total supply of NEAR

[NEAR]
What is the official wallet for the NEAR Protocol?
A. MetaMask
B. NEAR Wallet (or my.near.org) *
C. Phantom
D. TronLink

[NEAR]
What is 'Delegation' in NEAR staking?
A. The process of a token holder assigning their NEAR to a Validator to earn rewards without running a node themselves *
B. A fixed loan agreement
C. The transfer of governance rights to the foundation
D. The burning of NEAR tokens

[NEAR]
How does NEAR prevent network congestion from a single popular dApp?
A. By shutting down the dApp
B. By dramatically increasing fees across the entire network
C. By isolating the high-traffic application onto its own shard *
D. By running on a Layer-2 solution

[NEAR]
What is a key design philosophy of NEAR that focuses on ease of use for the general public?
A. Extreme decentralization
B. Progressive Decentralization / Usability *
C. Privacy-by-default
D. Quantum resistance

[NEAR]
What is the token standard used for Non-Fungible Tokens (NFTs) on NEAR?
A. ERC-20
B. TRC-721
C. NEP-171 (similar to ERC-721) *
D. SPL

[NEAR]
What is 'Doomslug' specifically designed to provide?
A. Maximum transaction anonymity
B. Near-instant block finality after one communication round *
C. Decentralized file storage
D. Compatibility with the Bitcoin network

[NEAR]
What is a key difference between NEAR's Nightshade sharding and traditional sharding?
A. Only the chunks (not the full shard state) are posted to the main chain, reducing overhead *
B. It is entirely centralized
C. It only supports one language
D. It uses Proof-of-Work

[NEAR]
What is 'Aurora' in the NEAR ecosystem?
A. The official block explorer
B. An Ethereum Virtual Machine (EVM) running on the NEAR Protocol, allowing Solidity dApps to be deployed *
C. The name of the first shard
D. The governance token

[NEAR]
How does NEAR handle gas fees for new users in a simplified way?
A. The Foundation pays all fees
B. Developers can pay the gas fees on behalf of their users (Meta-transactions) *
C. Gas fees are fixed at zero
D. Users must stake a high amount of NEAR to get a free account

[NEAR]
What is the initial mechanism NEAR used for token distribution?
A. An Initial Coin Offering (ICO)
B. Airdrop to all Bitcoin holders
C. A token auction and private funding rounds *
D. Proof-of-Work mining

[NEAR]
What does NEP stand for in the context of NEAR?
A. NEAR Ecosystem Partner
B. NEAR Enhancement Proposal *
C. Network Engine Protocol
D. Node Execution Plan

[NEAR]
What is the role of 'Fishermen' in the NEAR consensus mechanism?
A. They challenge invalid chunks/blocks and are rewarded for providing evidence of foul play *
B. They are the same as validators
C. They provide liquidity
D. They are the governance voters

[NEAR]
What is the process of 'Slashing' in the NEAR consensus?
A. Rewarding a validator for good behavior
B. The penalty (loss of staked NEAR) for a validator who acts maliciously or becomes unresponsive *
C. A governance vote to change fees
D. The process of unstaking tokens

[NEAR]
What is the long-term vision of NEAR regarding the internet?
A. To replace all existing technology
B. To provide a decentralized, community-driven "cloud" platform for the open web (Web3) *
C. To be the sole Layer-2 for Ethereum
D. To facilitate anonymous transactions only

[NEAR]
What is 'Open Web' in the context of NEAR Protocol?
A. An internet network without any websites
B. A decentralized version of the internet where users control their data and assets *
C. A new type of cryptocurrency wallet
D. A centralized cloud service

Zcash (ZEC)
[ZCASH]
What is the primary goal of Zcash (ZEC)?
A. To be the fastest blockchain
B. To be the most decentralized Layer-2
C. To offer optional, strong transaction privacy and anonymity *
D. To be the leading stablecoin

[ZCASH]
What is the main cryptographic technique Zcash uses to enable shielded (private) transactions?
A. Ring Signatures
B. Stealth Addresses
C. zk-SNARKs (Zero-Knowledge Succinct Non-Interactive Argument of Knowledge) *
D. Homomorphic Encryption

[ZCASH]
Who is the founder and CEO of the Electric Coin Company (ECC), which leads Zcash development?
A. Edward Snowden
B. Matt Green
C. Zooko Wilcox-O'Hearn *
D. Satoshi Nakamoto

[ZCASH]
Zcash transactions can be one of two types: transparent or what other type?
A. Public
B. Private
C. Shielded *
D. Visible

[ZCASH]
What does the 'zero-knowledge' in zk-SNARKs mean?
A. The prover can convince the verifier that a statement is true without revealing any information about the statement itself *
B. The prover knows nothing about the verifier
C. The transaction amount is always zero
D. The fees are always zero

[ZCASH]
Zcash was originally based on the codebase of which other cryptocurrency?
A. Ethereum
B. Monero
C. Bitcoin *
D. Litecoin

[ZCASH]
What is the name of the address type that is public and works similarly to a Bitcoin address?
A. z-addr
B. p-addr
C. t-addr (Transparent Address) *
D. s-addr

[ZCASH]
What is the name of the address type that is private and uses zk-SNARKs?
A. t-addr
B. p-addr
C. z-addr (Shielded Address) *
D. s-addr

[ZCASH]
What is the significance of the 'Trusted Setup' ceremony in Zcash's early history?
A. It was a massive Proof-of-Work mining event
B. A multi-person process to create the initial cryptographic parameters and ensure the destruction of the toxic waste (master key) *
C. The first public release of the Zcash whitepaper
D. The first transaction between z-addresses

[ZCASH]
What is the consensus mechanism used by Zcash?
A. Proof-of-Stake (PoS)
B. Delegated Proof-of-Stake (DPoS)
C. Proof-of-Work (PoW) * 
D. Proof-of-Authority (PoA)

[ZCASH]
What is the 'Founders' Reward'?
A. A pool of money for all early investors
B. A portion of the block reward that was allocated to the Zcash founder, team, and foundation during the first four years *
C. The total initial supply of ZEC
D. A bonus for the first block miner

[ZCASH]
What mechanism on Zcash allows shielded users to selectively reveal their transaction details to a trusted third party (e.g., for compliance)?
A. View Key
B. Spend Key
C. Payment Disclosure *
D. Transparent-Shielding Bridge

[ZCASH]
What is the name of the key Zcash protocol upgrade that significantly improved shielded transaction efficiency and security?
A. Overwinter
B. Sapling
C. Heartwood *
D. Blossom

[ZCASH]
What does the term 'Fungibility' mean, a key feature Zcash aims to achieve?
A. The ability to be divisible into smaller units
B. The ability to be transferred across blockchains
C. The property where every unit of a currency is interchangeable with any other unit, without regard to its history *
D. The ability to be mined with consumer hardware

[ZCASH]
What is the name of the organization formed to support and improve the Zcash protocol and ecosystem?
A. Electric Coin Company (ECC)
B. Zcash Development Group
C. Zcash Foundation *
D. Zcash DAO

[ZCASH]
What is the process of moving ZEC from a t-addr to a z-addr called?
A. Deshielding
B. Shielding *
C. Transparent Transfer
D. Anonymous Send

[ZCASH]
What is the process of moving ZEC from a z-addr to a t-addr called?
A. Shielding
B. Deshielding *
C. Private Receive
D. Zero-Knowledge Transfer

[ZCASH]
What is a criticism often leveled against Zcash's original privacy model compared to Monero's?
A. Its fees are too high
B. Privacy is optional, meaning that if users don't shield funds, transaction history can be analyzed *
C. It only uses Proof-of-Stake
D. It has a high inflation rate

[ZCASH]
What is the name of the Zcash-specific Proof-of-Work mining algorithm that favors CPUs over ASICs?
A. SHA-256
B. Equihash
C. Equihash (Zcash-specific variant) *
D. RandomX

[ZCASH]
What is the Zcash network's approximate average block time?
A. 10 minutes
B. 1 minute
C. 2.5 minutes *
D. 30 seconds

[ZCASH]
What did Edward Snowden famously claim in 2022 regarding Zcash's origin?
A. That he was the founder, Zooko Wilcox
B. That he was one of the six anonymous participants in the Trusted Setup ceremony *
C. That he invented zk-SNARKs
D. That he was the first Zcash miner

[ZCASH]
What is the current developmental trajectory for Zcash's consensus mechanism?
A. Staying on Proof-of-Work
B. Moving to Delegated Proof-of-Stake
C. Transitioning to Proof-of-Stake *
D. Adopting Proof-of-History

[ZCASH]
What is the maximum supply limit of Zcash (ZEC)?
A. 19 million
B. 21 million * 
C. 42 million
D. Unlimited

[ZCASH]
What is a 'Note' in the Zcash shielded pool?
A. A paper wallet
B. A cryptographic commitment to an unspent shielded amount (similar to UTXOs for t-addr) *
C. The governance proposal
D. The Zcash block header

[ZCASH]
What Zcash upgrade introduced the Unified Addresses (UAs)?
A. Sapling
B. Overwinter
C. Halo *
D. Blossom

[ZCASH]
What is the key advantage of zk-SNARKs over Ring Signatures (used by Monero) regarding transaction size and verification time?
A. They are much slower
B. They are more complex to implement
C. They result in smaller proof sizes and faster verification times *
D. They are less secure

[ZCASH]
What is the primary function of the Zcash Foundation?
A. To operate all Zcash miners
B. To steward the Zcash protocol, support the community, and promote its use *
C. To run the Zcash centralized exchange
D. To manage the ZEC token supply

[ZCASH]
What does a Zcash transaction that goes from a t-addr to a z-addr accomplish?
A. It reveals the transaction amount
B. It moves transparent funds into the shielded pool, thus anonymizing them *
C. It burns the ZEC tokens
D. It is instantly finalized

[ZCASH]
What is a 'Sprout' address in Zcash's history?
A. The current, modern z-address
B. The first t-address ever created
C. The original, legacy z-address from Zcash's launch, before the Sapling upgrade *
D. The address for the Founders' Reward

[ZCASH]
What is the primary purpose of the ongoing transition to Proof-of-Stake for Zcash?
A. To increase block time
B. To reduce the total supply
C. To enhance security, allow for trustless bridging to other chains, and enable community governance *
D. To make mining easier for everyone

Monero (XMR)
[MONERO]
What is the primary goal of Monero (XMR)?
A. To be the fastest blockchain
B. To be the most energy-efficient coin
C. To offer mandatory, default privacy and untraceability for all transactions *
D. To be the reserve currency of the internet

[MONERO]
What is the main cryptographic technique Monero uses to hide the sender of a transaction?
A. zk-SNARKs
B. Ring Signatures *
C. Multi-signature wallets
D. Homomorphic encryption

[MONERO]
What technology does Monero use to hide the receiver of a transaction?
A. RingCT
B. Private Keys
C. Stealth Addresses *
D. Transparent Addresses

[MONERO]
What does the Monero acronym RingCT stand for?
A. Ring Confidential Time
B. RandomX Consensus Token
C. Ring Confidential Transactions *
D. Reliable Centralized Transmission

[MONERO]
What does RingCT specifically hide in a Monero transaction?
A. The sender's IP address
B. The identity of the receiver
C. The transaction amount *
D. The transaction date

[MONERO]
Monero is built on which protocol?
A. Bitcoin Protocol
B. Ethereum Protocol
C. CryptoNote Protocol *
D. TRON Protocol

[MONERO]
What does Monero achieve by having privacy features mandatory for all transactions?
A. Lower gas fees
B. Fungibility (every XMR is equally valuable and untainted) *
C. Faster transaction speed
D. Greater network centralization

[MONERO]
How does Monero's default privacy differ from Zcash's optional privacy?
A. Monero makes all transaction details (sender, receiver, amount) private by default, while Zcash offers the choice between transparent and shielded transactions *
B. Monero is less secure than Zcash
C. Monero uses Proof-of-Stake
D. Monero has a hard cap on its supply

[MONERO]
What is the name of Monero's Proof-of-Work mining algorithm that is designed to be ASIC-resistant?
A. SHA-256
B. Equihash
C. Scrypt
D. RandomX *

[MONERO]
What is the consensus mechanism used by Monero?
A. Proof-of-Stake (PoS)
B. Delegated Proof-of-Stake (DPoS)
C. Proof-of-Work (PoW) *
D. Proof-of-Authority (PoA)

[MONERO]
What is 'Tail Emission' in the context of Monero's supply?
A. A mechanism to burn excess supply
B. A fixed limit on the total supply
C. A continuous, small, fixed inflation of new XMR after the main mining phase, designed to incentivize miners long-term and maintain security *
D. The initial token launch

[MONERO]
How does a Stealth Address protect the receiver's privacy?
A. It encrypts the transaction amount
B. It creates a unique, one-time-use public address for every transaction, preventing linking *
C. It hides the sender's IP address
D. It requires a password to open

[MONERO]
What is the approximate average block time for the Monero network?
A. 10 minutes
B. 2.5 minutes
C. 2 minutes *
D. 30 seconds

[MONERO]
What is the Monero equivalent of Bitcoin's 'unspent transaction output' (UTXO)?
A. Note
B. Key Image *
C. Ring Signature
D. Stealth Address

[MONERO]
What is a 'view key' in Monero?
A. A private key that allows a user to view the details of their incoming transactions, but not spend the funds *
B. A public key used to send funds
C. The key used to sign the ring signature
D. The key used to run a full node

[MONERO]
What does Monero use to make its blockchain size manageable, despite the large size of Ring Signatures?
A. Fixed block size
B. A dynamic block size limit that can increase when needed *
C. Off-chain storage
D. Sharding

[MONERO]
How does RandomX help maintain decentralization?
A. It gives more power to big corporations
B. It is optimized for general-purpose CPUs, discouraging the use of specialized, expensive ASIC mining hardware *
C. It favors graphics cards (GPUs)
D. It only allows mining in specific countries

[MONERO]
What is the significance of Monero's lack of transparent transaction history?
A. It makes the network slower
B. It prevents the network from working
C. It ensures that no coin can be "tainted" or blacklisted due to its prior history, reinforcing fungibility *
D. It reduces the need for miners

[MONERO]
Monero's original launch in 2014 was a fork of what original CryptoNote coin?
A. Primecoin
B. Namecoin
C. Bytecoin *
D. Dogecoin

[MONERO]
How is Monero governed?
A. By a centralized CEO
B. By a decentralized, open-source development community, with a volunteer structure and community funding (CCS) *
C. By an annual vote of all users
D. By a single, fixed whitepaper

[MONERO]
What is the 'Community Crowdfunding System (CCS)'?
A. A centralized charity fund
B. A mechanism where the community funds development, research, and outreach proposals *
C. The mining reward distribution system
D. The system for adjusting transaction fees

[MONERO]
What is the total maximum supply of Monero (XMR)?
A. 21 million
B. 42 million
C. 18.4 million (main supply, but is technically uncapped due to Tail Emission)
D. Technically uncapped, with an eventual fixed minimal inflation rate (Tail Emission) *

[MONERO]
What is the Key Image used for in Monero?
A. To hide the sender's address
B. To hide the transaction amount
C. To cryptographically ensure that a transaction is not a double-spend, while remaining unlinkable to the sender *
D. To represent the current block hash

[MONERO]
What is the main reason why some centralized exchanges delist Monero?
A. Its low trading volume
B. Regulatory pressure due to its strong, default privacy features *
C. Its slow block time
D. Its use of Proof-of-Work

[MONERO]
How does a Ring Signature work?
A. It requires all participants to use the same key
B. It mixes the sender's key with other public keys (decoys) on the blockchain, making it impossible to tell which key belongs to the true sender *
C. It permanently destroys the sender's key
D. It uses a fixed, small set of participants

[MONERO]
What is the process of a new block being added to the Monero chain called?
A. Staking
B. Mining *
C. Forging
D. Validating

[MONERO]
What is the term for a Monero wallet that allows a user to manage both their view key and spend key?
A. View-only wallet
B. Full wallet *
C. Hardware wallet
D. Web wallet

[MONERO]
What is the function of the Spend Key in Monero?
A. To receive XMR
B. To view transactions
C. To sign and authorize the spending of XMR *
D. To run a full node

[MONERO]
What is a key security risk associated with using a 'light wallet' for Monero?
A. The light wallet's node/server can see the user's view key, potentially compromising privacy *
B. Light wallets cannot receive XMR
C. Light wallets require high transaction fees
D. Light wallets only support transparent transactions

[MONERO]
What is a key focus of Monero's ongoing development in terms of privacy?
A. Transitioning to optional privacy
B. Removing the Stealth Address feature
C. Improving the anonymity set and making transactions even more private/untraceable (e.g., adding more decoys) *
D. Removing the Tail Emission

Hyperliquid (HYPER)
[HYPERLIQUID]
What is Hyperliquid primarily designed to be in the DeFi space?
A. A lending/borrowing platform
B. An NFT marketplace
C. A high-performance decentralized exchange (DEX) for perpetual contracts and margin trading *
D. A Proof-of-Work mining pool

[HYPERLIQUID]
Hyperliquid is built on what type of architecture to achieve high speeds?
A. Ethereum Layer-2
B. A fixed-function smart contract on Solana
C. Its own dedicated Layer-1 blockchain (Hyperliquid Chain) *
D. A centralized, off-chain ledger

[HYPERLIQUID]
What is the native token of the Hyperliquid Layer-1 blockchain?
A. HLIQ
B. PERP
C. HYPE *
D. USDC

[HYPERLIQUID]
What is the specialized consensus mechanism used by the Hyperliquid Chain?
A. Proof-of-History (PoH)
B. Delegated Proof-of-Stake (DPoS)
C. Hyper BFT (Byzantine Fault Tolerance) *
D. RandomX

[HYPERLIQUID]
What is a key feature Hyperliquid utilizes to offer an experience similar to a centralized exchange (CEX)?
A. An on-chain limit order book (Central Limit Order Book - CLOB) *
B. Mandatory KYC
C. Fixed, high transaction fees
D. Only market orders

[HYPERLIQUID]
What is a 'Perpetual Derivative' (Perp) offered by Hyperliquid?
A. A bond with no expiration date
B. A fixed-term loan
C. A futures contract that never expires (has no settlement date) *
D. A permanent staking mechanism

[HYPERLIQUID]
What is the primary asset used as collateral and for withdrawals on Hyperliquid?
A. ETH
B. BTC
C. USDC *
D. HYPE

[HYPERLIQUID]
What is a unique characteristic of the Hyperliquid Layer-1 chain regarding speed?
A. Block confirmations take less than a second *
B. Block confirmations take 10 minutes
C. It is slower than Ethereum's Layer-1
D. It uses fixed-time block confirmations

[HYPERLIQUID]
What is a common criticism leveled against the Hyperliquid Layer-1 chain?
A. Its low transaction volume
B. Its relatively centralized structure with a small number of validators (e.g., 16) *
C. Its use of Proof-of-Work
D. Its lack of a native token

[HYPERLIQUID]
What does Hyperliquid offer that allows traders to magnify their potential profits and losses?
A. Staking
B. Arbitrage
C. Leverage/Margin Trading *
D. Fixed interest rates

[HYPERLIQUID]
How was the native HYPE token primarily launched?
A. Through an Initial Coin Offering (ICO)
B. Via an airdrop to early users and high-volume traders *
C. Through Proof-of-Work mining
D. By a centralized sale to institutions

[HYPERLIQUID]
What is the primary role of the HYPE token?
A. To be used as the only collateral asset
B. Governance, staking/securing the L1 chain, and fee discounts *
C. To be burned immediately upon receipt
D. To exclusively fund the development team

[HYPERLIQUID]
What is the process of locking up HYPE tokens to earn rewards and secure the Hyperliquid chain?
A. Mining
B. Forging
C. Staking *
D. Yield Farming

[HYPERLIQUID]
What does Byzantine Fault Tolerance (BFT) ensure in the Hyperliquid consensus?
A. Slow, but secure transactions
B. That the network can reach consensus even if some validators are malicious or faulty *
C. Mandatory anonymity
D. A fixed block time of 10 minutes

[HYPERLIQUID]
How does Hyperliquid handle deposits from other major chains (like Ethereum or Solana)?
A. It only accepts deposits from its own chain
B. Through direct deposits from over 30 chains into the Hyperliquid Layer-1 *
C. It requires users to convert all assets to BTC first
D. It uses a centralized brokerage service

[HYPERLIQUID]
What is the meaning of a 'Decentralized Exchange (DEX)' in Hyperliquid's context?
A. The exchange is run by a single central entity
B. Trading occurs directly on-chain without the need for a trusted third-party custodian holding user funds *
C. It only supports anonymous transactions
D. It is limited to a single trading pair

[HYPERLIQUID]
What type of trading does Hyperliquid focus on?
A. Spot trading only
B. Options trading only
C. Perpetual futures and margin trading *
D. Fixed-term lending

[HYPERLIQUID]
What is the key advantage of Hyperliquid's Central Limit Order Book being on-chain?
A. It ensures maximum privacy
B. It provides transparent, auditable matching of orders and deep on-chain liquidity *
C. It makes transactions very slow
D. It only allows large, institutional trades

[HYPERLIQUID]
What kind of transaction finality is achieved by the Hyperliquid Layer-1?
A. Sub-second finality *
B. Finality in 10 minutes
C. Finality in 30 seconds
D. Finality that is never guaranteed

[HYPERLIQUID]
What is the main security measure Hyperliquid relies on?
A. The Bitcoin mining network
B. The Ethereum security layer
C. Its own Layer-1 Hyperliquid Chain's security, enhanced by audits and a bug bounty program *
D. Mandatory government regulation

[HYPERLIQUID]
What is the main utility of staking HYPE tokens?
A. To provide trading liquidity
B. To earn a share of the protocol's fee revenue and participate in governance *
C. To burn the token supply
D. To run a light wallet

[HYPERLIQUID]
What does Hyperliquid mean by 'Self-Custody'?
A. The exchange holds the user's funds
B. Users retain control of their private keys and thus their assets *
C. All funds are automatically loaned out
D. The user is responsible for the exchange's security

[HYPERLIQUID]
What is the name of the official non-profit organization that supports the Hyperliquid ecosystem?
A. Hyperliquid Labs
B. Hyperliquid Foundation *
C. Hyper BFT Group
D. There is no official foundation

[HYPERLIQUID]
What is the main difference between the Hyperliquid DEX and a typical AMM (Automated Market Maker) DEX like PancakeSwap?
A. Hyperliquid only uses tokens, AMMs use stablecoins
B. Hyperliquid uses an Order Book (CLOB), while AMMs use liquidity pools and mathematical formulas *
C. Hyperliquid is a Layer-2, AMMs are Layer-1
D. Hyperliquid is entirely centralized

[HYPERLIQUID]
What is an 'Authorization' in the Hyperliquid trading flow?
A. The process of connecting a centralized bank account
B. An initial off-chain signature that allows the exchange's smart contract to manage a user's funds without requiring a signature for every trade *
C. A governance vote to allow a new feature
D. A mandatory KYC procedure

[HYPERLIQUID]
What is the process of setting up a Hyperliquid account often described as?
A. Requiring a full KYC submission
B. Simple and quick, often requiring just an email and a wallet connection *
C. Very complex, requiring multiple documents
D. Only possible for institutional investors

[HYPERLIQUID]
What is the relationship between Hyperliquid and the HYPE token price?
A. The token price is pegged to the trading volume
B. The token price is purely fixed
C. The token's value is tied to the success and fee generation of the perpetual exchange, as fees often go to HYPE stakers/burns *
D. There is no relationship

[HYPERLIQUID]
What does Hyperliquid mean by 'zero-compromises on control'?
A. Users can change the consensus mechanism
B. Users can vote on all transactions
C. Users maintain full self-custody of their funds while trading with CEX-like speed *
D. The exchange is not subject to any regulation

[HYPERLIQUID]
How does Hyperliquid ensure trades are executed fairly and without front-running?
A. By running a single, central server
B. Through its high-speed Layer-1 architecture and on-chain order book for transparent execution *
C. By manually reviewing every trade
D. By only allowing fixed-price orders

[HYPERLIQUID]
What is a key feature for developers building on the Hyperliquid Chain?
A. The ability to build their own financial applications that leverage the chain's speed and order book *
B. Exclusive use of the Solidity language
C. Fixed gas fees in HYPE
D. Mandatory collaboration with the centralized team