What is a blockchain?

• A type of computer

• A digital ledger of transactions

• A social media platform

• A programming language

Which of the following is a key feature of blockchain technology?

• Centralized control

• Immutability

• High transaction fees

• Slow processing speed

What does it mean when a blockchain is "decentralized"?

• It is controlled by a single person

• It is managed by multiple independent participants

• It exists only in one location

• It cannot be accessed online

In a blockchain, what is a "block"?

• A single transaction

• A group of transactions bundled together

• A random number generator

• A programming command

Which of the following cryptocurrencies is most widely known?

• Ethereum

• Litecoin

• Bitcoin

• Dogecoin

What is a "smart contract"?

• A legally binding document

• A self-executing contract with the terms directly written into code

• A computer program that cannot be changed

• A social agreement between friends

Which technology is used to verify transactions on most blockchains?

• Artificial Intelligence

• Virtual Reality

• Cryptography

• Cloud Computing

What is a "hash" in the context of blockchain?

• A type of computer virus

• A digital fingerprint of data

• A method of creating websites

• A social media function

Why are blockchains considered secure?

• They are hidden from all users

• They use complex math to make data hard to alter

• They can only be accessed by one person

• They store data in a single location

What is mining in the context of cryptocurrencies?

• Growing plants

• Creating new blocks by solving complex mathematical problems

• Digging for gold

• Job searching