Cryptocurrency Knowledge Test — Questions and Answers

Question 1: What is the primary purpose of a cryptocurrency 'whitepaper'?

A technical and conceptual overview of a cryptocurrency project (Correct answer)
An audit report by a third-party security firm
A list of all token holders at launch
A legal document filed with the SEC

Correct answer: A technical and conceptual overview of a cryptocurrency project

A whitepaper is a document that outlines the technical details, use case, tokenomics, and vision of a cryptocurrency project, most famously exemplified by Bitcoin's whitepaper by Satoshi Nakamoto.

Question 2: What is the significance of the SEC v. Ripple Labs case for US crypto regulation?

It required all crypto exchanges to register as broker-dealers
It challenged whether XRP was an unregistered security (Correct answer)
It established that all cryptocurrencies are securities
It banned cross-border crypto transactions

Correct answer: It challenged whether XRP was an unregistered security

The SEC sued Ripple claiming XRP was sold as an unregistered security, making this a landmark case for how tokens are classified under securities law.

Question 3: What is 'provenance' in the context of NFTs?

The geographic location where an NFT was created
The estimated future value of an NFT based on market trends
The legal copyright registration of an NFT's underlying artwork
The verifiable ownership and transaction history of an NFT recorded on the blockchain (Correct answer)

Correct answer: The verifiable ownership and transaction history of an NFT recorded on the blockchain

Blockchain provenance provides an immutable record of every wallet that has owned an NFT, enabling buyers to verify authenticity and trace the asset back to its original minting.

Question 4: Which of the following is a well-known decentralized exchange (DEX) built on Ethereum?

Kraken
Uniswap (Correct answer)
Coinbase
Binance

Correct answer: Uniswap

Uniswap is a leading DEX on Ethereum that uses an AMM model to enable trustless token swaps.

Question 5: What does a high 'bid-ask spread' on a crypto exchange typically indicate?

High trading volume and strong market interest
Low liquidity and potentially higher transaction costs for traders (Correct answer)
Heavy institutional accumulation of the asset
A bullish trend confirmed by technical indicators

Correct answer: Low liquidity and potentially higher transaction costs for traders

A wide bid-ask spread signals low liquidity, meaning it's harder to trade without incurring significant costs or moving the price.

Question 6: In HD (Hierarchical Deterministic) wallets, what role does HMAC-SHA512 play?

It generates the random seed for the wallet
It derives child key pairs from a parent key and a chain code (Correct answer)
It encrypts the wallet's seed phrase for storage
It hashes transaction data before signing

Correct answer: It derives child key pairs from a parent key and a chain code

HD wallets use HMAC-SHA512 with a parent key and chain code as inputs to deterministically derive child private and public keys.

Question 7: Which order type guarantees execution but not price in crypto markets?

Limit order
Market order (Correct answer)
Take-profit order
Stop-limit order

Correct answer: Market order

A market order executes immediately at the best available price, guaranteeing fill but not the exact price.

Question 8: What is the common name for the process of producing new bitcoins?

Finding
Sourcing
Mining (Correct answer)
Panning

Correct answer: Mining

Explanation <br> Mining is the process by which new Bitcoins are created. In particular, each time A miner adds a block of transactions to the Bitcoin blockchain in the correct order.

Question 9: Which attack requires an entity to control more than 50% of a network's hash rate?

Replay attack
Eclipse attack
Sybil attack
51% attack (Correct answer)

Correct answer: 51% attack

A 51% attack requires majority hash rate control, enabling the attacker to reorganize recent blocks and potentially double-spend transactions.

Question 10: What distinguishes an 'EOA' from a 'contract account' on Ethereum?

EOAs are controlled by private keys and cannot hold code; contract accounts hold EVM bytecode (Correct answer)
EOAs pay no gas fees; contract accounts pay double fees
EOAs require multi-sig approval; contract accounts are single-key
EOAs are used only on testnets; contract accounts are mainnet-only

Correct answer: EOAs are controlled by private keys and cannot hold code; contract accounts hold EVM bytecode

Externally Owned Accounts (EOAs) are controlled by a private key and contain no code, while contract accounts are governed entirely by their deployed EVM bytecode.

Question 11: What does the term 'slippage' refer to in DEX trading?

The time delay between placing and confirming an order
The fee charged by a DEX on each transaction
The difference between the expected and actual execution price of a trade (Correct answer)
The reduction in token supply after a burn event

Correct answer: The difference between the expected and actual execution price of a trade

Slippage is the difference between the expected trade price and the actual price at execution, common in low-liquidity pools or large trades.

Question 12: What does 'key stretching' accomplish when used in wallet encryption?

It extends the length of the blockchain
It duplicates private keys for backup redundancy
It converts public keys to longer formats
It makes brute-force attacks more computationally expensive by deriving a stronger key from a password (Correct answer)

Correct answer: It makes brute-force attacks more computationally expensive by deriving a stronger key from a password

Key stretching algorithms like PBKDF2 or bcrypt apply many hash iterations to a password, dramatically increasing the cost of brute-force attempts.

Question 13: What is the purpose of a 'nonce' in Bitcoin's Proof of Work mining?

It is a unique identifier assigned to each miner by the network
It is a cryptographic signature verifying the miner's identity
It is the transaction count included in each block
It is a number miners iterate through to find a block hash below the current difficulty target (Correct answer)

Correct answer: It is a number miners iterate through to find a block hash below the current difficulty target

Miners repeatedly change the nonce (a 32-bit number) and rehash the block header until they find a hash that meets the difficulty target.

Question 14: Which of the following best describes the function of a node's 'mempool' in a blockchain network?

A temporary storage area for unconfirmed, but valid, transactions waiting to be included in a block. (Correct answer)
The cryptographic pool of random nonces used by miners during the hashing process.
A database of all previously confirmed transactions in the blockchain.
A list of all active mining nodes currently competing to solve the next block.

Correct answer: A temporary storage area for unconfirmed, but valid, transactions waiting to be included in a block.

The mempool, or memory pool, is a holding area within each blockchain node that stores valid, unconfirmed transactions. Miners select transactions from their mempool, typically prioritizing those with higher fees, to include in the next block they are attempting to mine.

Question 15: What is an Automated Market Maker (AMM) in DeFi?

A smart contract that mines tokens automatically
A protocol that uses liquidity pools and algorithms to price assets (Correct answer)
A trading bot that executes orders automatically
A centralized exchange with automated order matching

Correct answer: A protocol that uses liquidity pools and algorithms to price assets

An AMM uses liquidity pools and mathematical formulas to automatically price and swap assets without needing a traditional order book.

Question 16: What is the 'Lightning Network' designed to solve?

Bitcoin's slow transaction speed and scalability issues (Correct answer)
Regulatory compliance for crypto exchanges
Ethereum's high gas fees
The double-spend problem on altcoin networks

Correct answer: Bitcoin's slow transaction speed and scalability issues

The Lightning Network is a Layer 2 payment protocol built on Bitcoin that enables fast, low-cost transactions by creating off-chain payment channels.

Question 17: Which property of cryptographic hash functions ensures that even a tiny change in input drastically changes the output?

Determinism
Pre-image resistance
Second pre-image resistance
Avalanche effect (Correct answer)

Correct answer: Avalanche effect

The avalanche effect means a single-bit change in input causes approximately 50% of the output bits to flip, making outputs appear uncorrelated.

Question 18: What is 'yield farming' in DeFi?

Lending or staking crypto assets to earn rewards or interest (Correct answer)
Mining new tokens using specialized hardware
Using bots to arbitrage price differences across exchanges
Purchasing land in a blockchain-based virtual world

Correct answer: Lending or staking crypto assets to earn rewards or interest

Yield farming involves depositing or lending cryptocurrency assets into DeFi protocols to generate returns in the form of interest, fees, or governance tokens.

Question 19: What does 'SHA' stand for in the context of Bitcoin's SHA-256 algorithm?

Secure Hash Algorithm (Correct answer)
Sequential Hash Application
Symmetric Hashing Array
Standard Hashing Architecture

Correct answer: Secure Hash Algorithm

SHA stands for Secure Hash Algorithm, a family of cryptographic hash functions published by NIST.

Question 20: What is the 'Merkle tree' used for in a blockchain?

Storing user wallet addresses in an encrypted database
Generating new private keys for wallet creation
Efficiently summarizing and verifying the integrity of all transactions in a block (Correct answer)
Routing messages between nodes in a peer-to-peer network

Correct answer: Efficiently summarizing and verifying the integrity of all transactions in a block

A Merkle tree is a hash-based data structure that allows efficient and secure verification of large sets of transaction data, with the Merkle root stored in each block header.

Question 21: Under the Travel Rule, what information must U.S. crypto businesses transmit when transferring funds over $3,000?

Only the sender's name
Sender and receiver identifying information (Correct answer)
The wallet's IP address
The transaction hash only

Correct answer: Sender and receiver identifying information

The Travel Rule requires Virtual Asset Service Providers to collect and transmit both originator and beneficiary information for transfers above the threshold.

Question 22: What is a zero-knowledge proof (ZKP) used for in cryptocurrency?

Validating wallet addresses without connecting to the network
Encrypting blockchain data so miners cannot read it
Proving a transaction is valid without revealing any underlying private data (Correct answer)
Generating cryptographic keys with zero entropy

Correct answer: Proving a transaction is valid without revealing any underlying private data

ZKPs allow one party to prove knowledge of a secret (e.g., a valid transaction) to another party without revealing the secret itself.

Question 23: What does 'social recovery' mean in the context of smart contract wallets?

A mechanism allowing pre-designated 'guardians' to collectively restore wallet access if the owner loses their key (Correct answer)
Sharing a wallet with members of a social network
Recovering a wallet by logging in with a social media account
Using social engineering to obtain someone else's seed phrase

Correct answer: A mechanism allowing pre-designated 'guardians' to collectively restore wallet access if the owner loses their key

Social recovery lets a user designate trusted guardians who can vote to replace the signing key, enabling recovery without a traditional seed phrase backup.

Question 24: What distinguishes Delegated Proof of Stake (DPoS) from standard Proof of Stake?

Only the largest stakers can delegate their rewards to smaller holders
Validators must delegate their stake to mining pools to participate
Token holders vote for a limited set of delegates who validate transactions on their behalf (Correct answer)
DPoS requires validators to also perform Proof of Work

Correct answer: Token holders vote for a limited set of delegates who validate transactions on their behalf

In DPoS, token holders vote for a small group of elected delegates (e.g., 21 in EOS) who produce blocks, making consensus more efficient.

Question 25: Which of the following best describes a Sybil attack on a blockchain network?

An attacker creates many fake identities to gain disproportionate influence in a peer-to-peer network (Correct answer)
Exploiting a smart contract reentrancy vulnerability
Flooding a network with transaction spam to cause congestion
Stealing validator keys to sign fraudulent blocks

Correct answer: An attacker creates many fake identities to gain disproportionate influence in a peer-to-peer network

In a Sybil attack, an adversary creates numerous fake node identities to subvert the reputation system or consensus mechanism of a decentralized network.

Question 26: A development team is launching a new cryptocurrency and wants to promote decentralization by ensuring that miners using consumer-grade hardware (like CPUs and GPUs) can participate effectively. They decide to implement a mining algorithm that is intentionally inefficient for specialized hardware. What is this property called?

Proof of Stake
ASIC Resistance (Correct answer)
Mining Centralization
Sharding

Correct answer: ASIC Resistance

ASIC resistance refers to the design of a cryptocurrency's mining algorithm to prevent or discourage the use of Application-Specific Integrated Circuits (ASICs). By making the algorithm better suited for general-purpose hardware like CPUs or GPUs, the goal is to lower the barrier to entry for mining, encourage wider participation, and thus enhance the decentralization of the network.

Question 27: What is the purpose of a blockchain 'mempool'?

The memory used to store smart contract state
A holding area for unconfirmed transactions waiting to be included in a block (Correct answer)
Long-term archival storage for old blocks
A cache for recently accessed wallet balances

Correct answer: A holding area for unconfirmed transactions waiting to be included in a block

The memory pool (mempool) is where broadcast transactions queue before miners/validators select them for block inclusion, typically prioritizing higher-fee transactions.

Question 28: What does NFT stand for?

Null-Function Transfer
Non-Fungible Token (Correct answer)
Network Finality Token
New Financial Technology

Correct answer: Non-Fungible Token

NFT stands for Non-Fungible Token, meaning each token is unique and cannot be exchanged on a one-to-one basis with another token of the same type.

Question 29: In the context of dApps, what is 'wallet connect'?

A Solidity library for managing multi-sig wallets
A hardware wallet firmware protocol
An open protocol that links mobile wallets to desktop dApps via QR code (Correct answer)
A Coinbase product for custodial wallet integration

Correct answer: An open protocol that links mobile wallets to desktop dApps via QR code

WalletConnect is a protocol that creates an encrypted connection between a dApp and a user's mobile wallet by scanning a QR code, enabling transaction signing without exposing private keys.

Question 30: In a UTXO-based blockchain like Bitcoin, what must a sender prove to spend funds?

A majority of nodes approve the transaction
Their account balance exceeds the transaction amount
They know the private key corresponding to the UTXO's locking script (Correct answer)
The recipient's wallet is active on the network

Correct answer: They know the private key corresponding to the UTXO's locking script

To spend a UTXO, the sender must provide a valid digital signature proving ownership of the private key that matches the UTXO's public key hash.

Question 31: Which field in a block header links it cryptographically to the previous block?

Merkle root
Timestamp
Previous block hash (Correct answer)
Nonce

Correct answer: Previous block hash

The previous block hash field contains the hash of the preceding block, creating the cryptographic chain that makes altering past blocks computationally infeasible.

Question 32: What are sidechains, exactly?

Another term for a hash function
Smart Contracts that have forked off the main Blockchain
Any mechanism that allows tokens from one blockchain to be securely used within a completely separate Blockchain (Correct answer)
A parallel network running adjacent to the main blockchain network for additional security

Correct answer: Any mechanism that allows tokens from one blockchain to be securely used within a completely separate Blockchain

Explanation <br> The correct answer <br> Any mechanism that allows tokens from one blockchain to be securely used within a completely separate Blockchain

Question 33: What does 'zero-knowledge proof' allow a prover to demonstrate?

Knowledge of a secret without revealing the secret itself (Correct answer)
That a transaction has zero fees
Complete transaction transparency on-chain
The mathematical zero value of a hash

Correct answer: Knowledge of a secret without revealing the secret itself

A zero-knowledge proof lets one party prove they know a value without disclosing any information about the value itself.

Question 34: In the context of cryptocurrency wallets, what is 'coin control'?

A feature that limits how much crypto can be spent per day
A government control mechanism on digital assets
Automatic conversion between different cryptocurrencies
The ability to manually select which UTXOs are used as inputs in a transaction (Correct answer)

Correct answer: The ability to manually select which UTXOs are used as inputs in a transaction

Coin control lets users choose specific unspent transaction outputs (UTXOs) to use in a transaction, improving privacy and fee management.

Question 35: What is 'merge mining'?

Merging multiple mining pools into a single entity
Mining two different cryptocurrencies simultaneously using the same proof-of-work (Correct answer)
Using multiple algorithms to mine a single coin
Combining two separate mining rigs into one system

Correct answer: Mining two different cryptocurrencies simultaneously using the same proof-of-work

Merge mining (AuxPoW) allows miners to mine a parent chain and a child chain simultaneously without extra computational work.

Question 36: What is the purpose of 'key stretching' techniques like PBKDF2 or bcrypt in cryptocurrency wallets?

To slow down brute-force attacks on passwords used to encrypt wallets (Correct answer)
To convert symmetric keys to asymmetric keys
To increase the length of the public key
To compress private keys for storage

Correct answer: To slow down brute-force attacks on passwords used to encrypt wallets

Key stretching adds computational cost to password hashing, making brute-force attacks on wallet passwords impractically slow.

Question 37: What is the purpose of a passphrase (sometimes called the '25th word') added to a BIP39 seed?

It speeds up wallet synchronization
It is required to broadcast transactions on-chain
It replaces the seed phrase entirely
It creates an additional layer of encryption for an extra hidden wallet (Correct answer)

Correct answer: It creates an additional layer of encryption for an extra hidden wallet

A BIP39 passphrase generates a completely different wallet derivation path, acting as a second factor so a stolen seed phrase alone is insufficient.

Question 38: What is a 'dynamic NFT' (dNFT)?

An NFT that automatically increases in price over time
An NFT issued by a DAO through a governance vote
An NFT whose metadata and appearance can change based on external data or on-chain conditions (Correct answer)
An NFT that can be split into multiple unique tokens

Correct answer: An NFT whose metadata and appearance can change based on external data or on-chain conditions

Dynamic NFTs use oracles or on-chain logic to update their metadata — for example, a sports card NFT that reflects a player's real-time stats — making them responsive to real-world events.

Question 39: What is the purpose of a 'crypto mixer' or 'tumbler,' and why is it legally problematic?

A service that pools and shuffles transactions to obscure their origin, raising money laundering concerns (Correct answer)
A tool that combines multiple cryptocurrencies into a portfolio—legal but complex
Software that mixes proof-of-work and proof-of-stake consensus mechanisms
A protocol for aggregating DEX liquidity across multiple blockchains

Correct answer: A service that pools and shuffles transactions to obscure their origin, raising money laundering concerns

Mixers obscure the blockchain trail between sender and recipient; OFAC sanctioned Tornado Cash in 2022 for facilitating over $7 billion in money laundering.

Question 40: What is the 'avalanche effect' in the context of cryptographic hashing?

The process of multiple hashes cascading to form a blockchain.
A small change in the input data results in a completely different hash output. (Correct answer)
The property that two different inputs will eventually produce the same hash.
A network failure caused by too many simultaneous hash calculations.

Correct answer: A small change in the input data results in a completely different hash output.

The avalanche effect is a desirable property of cryptographic hash functions where a minor change to the input (like flipping a single bit) will cause a significant and unpredictable change in the output hash. [2, 21] This ensures that similar inputs do not result in similar-looking outputs, which is crucial for security.

Question 41: What was the name of the well-known Japanese Bitcoin exchange that went bankrupt in 2014?

Tradehill
Bitstamp
Blockchain.info
Mt. Gox (Correct answer)

Correct answer: Mt. Gox

Mt. Gox was once the largest Bitcoin exchange in the world, handling over 70% of all Bitcoin transactions at its peak. In 2014, the Tokyo-based exchange collapsed after revealing that it had lost hundreds of thousands of bitcoins due to alleged hacking and mismanagement. Its bankruptcy was a major event that significantly impacted the early cryptocurrency market and highlighted security risks.

Question 42: Which hashing algorithm does Bitcoin's proof-of-work system use?

Scrypt
X11
Ethash
SHA-256 (Correct answer)

Correct answer: SHA-256

Bitcoin uses SHA-256 (Secure Hash Algorithm 256-bit) for its proof-of-work mining process.

Question 43: What is the purpose of the 'coin control' feature in advanced Bitcoin wallet software?

Manually selecting which UTXOs to spend to improve privacy and fee management (Correct answer)
Controlling which coins are eligible for staking rewards
Locking specific addresses from receiving future deposits
Setting a maximum price at which the wallet will process transactions

Correct answer: Manually selecting which UTXOs to spend to improve privacy and fee management

Coin control lets users choose exactly which UTXOs are included in a transaction, preventing dust coins from linking addresses and enabling fee optimization.

Question 44: Which security feature does multisig (multi-signature) provide for a cryptocurrency wallet?

It requires multiple private key signatures before a transaction can be executed (Correct answer)
It encrypts the wallet with multiple passwords simultaneously
It verifies a transaction across multiple blockchains at once
It generates new addresses for every transaction automatically

Correct answer: It requires multiple private key signatures before a transaction can be executed

Multisig wallets require M-of-N key holders to sign a transaction before it is broadcast, reducing single point of failure risk.

Question 45: In a Delegated Proof-of-Stake (DPoS) system, how are the entities that create and validate new blocks, often called 'witnesses' or 'delegates', chosen?

They are the token holders with the largest amount of staked cryptocurrency.
They are elected by the token-holding community through a continuous voting process. (Correct answer)
They are selected randomly by the protocol from the entire pool of token holders.
They are appointed by the original developers of the cryptocurrency.

Correct answer: They are elected by the token-holding community through a continuous voting process.

In a Delegated Proof-of-Stake (DPoS) system, token holders use their stake to vote for a limited number of delegates (also known as witnesses or block producers) who are responsible for validating transactions and creating new blocks. This voting system is a key feature that distinguishes DPoS from traditional Proof of Stake (PoS).

Question 46: What is 'rug pull' fraud in the context of DeFi?

When developers abandon a project and abscond with investor funds after removing liquidity (Correct answer)
When validators pull out of a staking pool suddenly
A regulatory seizure of DeFi protocol assets
When liquidity providers remove funds during a market crash

Correct answer: When developers abandon a project and abscond with investor funds after removing liquidity

A rug pull occurs when project developers suddenly withdraw all liquidity from a DeFi pool, leaving investors with worthless tokens and no recourse.

Question 47: What was the name of the first academic study that described bitcoin as it is now known?

The origins of money
The Bitcoin Whitepaper (Correct answer)
The great unrevealing

Correct answer: The Bitcoin Whitepaper

Explanation <br> Abstract of the Bitcoin Whitepaper Without passing via a banking institution, a peer-to-peer version of electronic cash would allow internet payments to be transmitted directly from one party to another.

Question 48: In the context of Bitcoin's Proof-of-Work, miners repeatedly hash the block header with a changing nonce. What is the primary goal of this process?

To find a hash value that is larger than the target difficulty.
To encrypt the transactions within the block for security.
To find a hash value that is below a certain target value. (Correct answer)
To create a digital signature for the block.

Correct answer: To find a hash value that is below a certain target value.

Bitcoin's Proof-of-Work (PoW) consensus mechanism requires miners to find a hash for the block header that is below a specific target value set by the network's difficulty. [12, 22] They do this by iterating through a number called a 'nonce' until the resulting hash meets the condition. This process requires significant computational effort, which secures the network.

Question 49: In crypto trading, what is the key difference between a centralized exchange (CEX) and a decentralized exchange (DEX)?

CEXs are regulated by the SEC; DEXs are regulated by the CFTC
CEXs use proof-of-work; DEXs use proof-of-stake for transaction validation
CEXs hold user funds in custody; DEXs allow users to trade directly from their own wallets (Correct answer)
CEXs only trade Bitcoin; DEXs support all ERC-20 tokens

Correct answer: CEXs hold user funds in custody; DEXs allow users to trade directly from their own wallets

On a CEX you deposit funds into the exchange's custody, while a DEX uses smart contracts so users always retain control of their private keys and assets.

Question 50: What does 'hashrate' measure in cryptocurrency mining?

The percentage of the total supply already mined
The size of the blockchain in gigabytes
The speed at which a miner performs hash computations per second (Correct answer)
The number of transactions validated per second

Correct answer: The speed at which a miner performs hash computations per second

Hashrate measures how many hash calculations a mining device or network performs per second, indicating mining power and network security.

Cryptocurrency Knowledge Test

The Cryptocurrency Knowledge Test exam validates essential knowledge and skills required for certification or licensure in this field.

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60 min

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