Blockchain Fundamentals of Blockchain Security

Question 1

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

Accepted Answer

Immutability

Answer

Centralized storage

Answer

Manual ledger updating

Answer

Dynamic block editing

Question 2

What role does hashing play in blockchain security?

Accepted Answer

Verifies data integrity

Answer

Encrypts the entire blockchain

Answer

Prevents mining

Answer

Ensures transaction anonymity

Question 3

What is a 51% attack in blockchain?

Accepted Answer

Gaining majority control to alter the chain

Answer

A DDoS on miners

Answer

Tampering with a single block

Answer

Unauthorized access to wallets

Question 4

Which consensus algorithm is most commonly used in Bitcoin?

Accepted Answer

Proof of Work

Answer

Proof of Stake

Answer

Proof of Authority

Answer

Proof of Burn

Question 5

Why is decentralization important in blockchain security?

Accepted Answer

Increases security through distributed control

Answer

Allows faster updates

Answer

Minimizes power usage

Answer

Simplifies data storage

Question 6

Which of the following helps prevent double spending in blockchain?

Accepted Answer

Consensus algorithms

Answer

Off-chain storage

Answer

Token burning

Answer

Hash collisions