Blockchain

What is a blockchain?

• A digital document timestamp

• A fingerprint identification system

• A type of cryptocurrency

• A chain of blocks that contains information

What was the original purpose of blockchain technology?

• To collect taxes

• To store medical records

• To create a digital currency

• To timestamp digital documents

What is the purpose of a hash in a block?

• To encrypt the data

• To compress the information

• To identify the block and its contents

• To create a digital signature

What is the genesis block in a blockchain?

• The block with the most transactions

• The first block in the chain

• The block with the highest value

• The most secure block

What is proof-of-work in blockchain technology?

• A process to store information

• A mechanism to slow down block creation

• A way to verify transactions

• A method to encrypt data

How does a blockchain ensure security against tampering?

• By deleting invalid blocks

• By encrypting all data

• By using hashing and proof-of-work

• By restricting access to the network

What is the role of nodes in a blockchain network?

• To verify blocks and create consensus

• To mine for new coins

• To store personal data

• To control the network

What are smart contracts in blockchain technology?

• Complex encryption algorithms

• Digital wallets for cryptocurrencies

• Decentralized voting systems

• Simple programs stored on the blockchain

What is the purpose of a peer-to-peer network in blockchain?

• To distribute the blockchain to all participants

• To centralize control of the chain

• To speed up block creation

• To hide transaction details

How difficult is it to tamper with a blockchain?

• Relatively easy

• Moderately challenging

• Extremely difficult

• Almost impossible