What is the primary function of a blockchain?

• To mine cryptocurrencies

• To store data securely in a decentralized way

• To verify internet protocols

• To create smart contracts

What is the first blockchain-based cryptocurrency?

• Ethereum

• Litecoin

• Bitcoin

• Ripple

What is a block in a blockchain?

• A storage of hashed data

• A ledger storing transactions and metadata

• A device used to mine Bitcoin

• A protocol used in consensus algorithms

Who is the pseudonymous creator of Bitcoin?

• Vitalik Buterin

• Satoshi Nakamoto

• Charles Hoskinson

• Gavin Andresen

In blockchain, what is a fork?

• A division in the blockchain network

• A new cryptocurrency

• A type of blockchain consensus

• A cryptographic key

What algorithm does Bitcoin use for mining?

• SHA-512

• SHA-256

• RSA

• AES

What consensus mechanism is most commonly used in Bitcoin?

• Proof of Stake (PoS)

• Delegated Proof of Stake (DPoS)

• Proof of Work (PoW)

• Byzantine Fault Tolerance

What is a smart contract?

• A legally binding agreement

• A self-executing contract with the terms written in code

• A protocol for consensus

• A type of cryptocurrency

What is a node in a blockchain network?

• A cryptocurrency wallet

• A computer that participates in the blockchain network

• A consensus algorithm

• A cryptographic key

Which of the following is a key feature of blockchain?

• Centralization

• Immutability

• Encryption

• Fungibility