Fundamentals and Cryptography Flashcards
7 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 7 Fundamentals and Cryptography flashcards as text
What is a nonce in the context of proof-of-work mining?
Answer: A value miners vary to find a valid block hash
Miners repeatedly change the nonce until the block hash meets the difficulty target.
What does 'immutability' mean for a blockchain ledger?
Answer: Recorded data cannot be feasibly altered after confirmation
Immutability means confirmed records cannot be changed without redoing all subsequent work.
How is a blockchain address typically derived from a public key?
Answer: By hashing the public key
Addresses are usually generated by applying hash functions to the public key.
What problem does the Byzantine Generals Problem describe in distributed systems?
Answer: Achieving agreement despite faulty or malicious participants
It describes reaching consensus when some participants may be unreliable or deceptive.
What is the role of the previous block hash field in each block?
Answer: It links blocks into a tamper-evident chain
Each block references the prior block's hash, chaining them so any change breaks the chain.
Which statement about symmetric encryption is correct?
Answer: It uses the same key for encryption and decryption
Symmetric encryption uses a single shared secret key for both operations.
What does ECDSA stand for in blockchain signing?
Answer: Elliptic Curve Digital Signature Algorithm
ECDSA is the Elliptic Curve Digital Signature Algorithm used to sign transactions.