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What is a blockchain?

A distributed ledger technology

A type of database

A programming language

A type of encryption

Which cryptocurrency was the first to use blockchain technology?

Bitcoin

Ethereum

Ripple

Litecoin

What does “decentralization” mean in blockchain?

The distribution of power and control across a network

The centralization of control in a single entity

The use of a central database

The use of a single server

What is the purpose of a “smart contract”?

To automate and enforce the terms of a contract using code

To store data

To create new blockchain blocks

To encrypt data

Which algorithm is commonly used for consensus in blockchain?

Proof of Work

Proof of Stake

Proof of Authority

All of the above

What is a “public key” in blockchain?

A cryptographic key that is shared publicly

A cryptographic key that is kept private

A key used to encrypt data

A key used to decrypt data

What is “mining” in blockchain?

The process of validating and adding transactions to the blockchain

The process of extracting data

The process of creating a new cryptocurrency

The process of hacking a blockchain

What is a “node” in blockchain?

A computer that participates in the blockchain network

A data storage unit

A type of cryptocurrency

A method of encryption

Which of the following is a benefit of blockchain?

Transparency

Security

Immutability

All of the above

What does “immutability” refer to in blockchain?

The inability to alter or change data once it is recorded

The ability to change data

The ability to delete data

The process of backing up data

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