Fundamentals of Blockchain Security Flashcards
6 cards from real Blockchain Technology practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Fundamentals of Blockchain Security flashcards as text
Which of the following is a key security feature of blockchain technology?
Answer: Immutability
Immutability ensures that once data is recorded in the blockchain, it cannot be changed, which is crucial for maintaining integrity.
What role does hashing play in blockchain security?
Answer: Verifies data integrity
Hashing converts data into a fixed-length string, making it nearly impossible to reverse-engineer and ensuring data integrity.
What is a 51% attack in blockchain?
Answer: Gaining majority control to alter the chain
A 51% attack occurs when a single entity gains majority control of the network's hashing power, allowing them to manipulate transactions.
Which consensus algorithm is most commonly used in Bitcoin?
Answer: Proof of Work
Proof of Work is the original consensus mechanism used by Bitcoin, requiring computational effort to validate transactions.
Why is decentralization important in blockchain security?
Answer: Increases security through distributed control
Decentralization removes the single point of failure, making it harder for attackers to compromise the network.
Which of the following helps prevent double spending in blockchain?
Answer: Consensus algorithms
Consensus mechanisms like Proof of Work prevent double spending by requiring network agreement before transactions are finalized.