FREE Certified Blockchain Professional (CBCP) Consensus Mechanisms and Mining Questions and Answers

Question 1

A miner successfully solves the cryptographic puzzle for a new block on a Proof-of-Work blockchain.
However, due to network latency, another miner's valid block is accepted onto the main chain first.
What is the term for the first miner's now-discarded block?

Accepted Answer

Stale Block

Answer

Orphan Block

Answer

Genesis Block

Answer

Uncle Block

Question 2

In a Delegated Proof of Stake (DPoS) consensus mechanism, how are block producers (validators) chosen?

Accepted Answer

They are elected by token holders who cast votes.

Answer

Through a lottery system based on the amount of stake held.

Answer

They are appointed by a centralized foundation.

Answer

By competing to solve a complex computational puzzle.

Question 3

A consortium wants to establish a private blockchain for settling high-value financial transactions. The network requires high throughput, low latency, and the ability to function correctly even if a minority of the known, permissioned nodes act maliciously. Which consensus mechanism is best suited for this scenario?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof of Work (PoW)

Answer

Proof of Stake (PoS)

Answer

Raft

Question 4

Which of the following best describes the primary purpose of the difficulty adjustment in the Bitcoin protocol?

Accepted Answer

To maintain a consistent average block time.

Answer

To increase the total supply of Bitcoin over time.

Answer

To decrease the transaction fees for users.

Answer

To ensure miners are always profitable.

Question 5

A malicious actor gains control over 51% of the network hashrate on a Proof-of-Work blockchain. Which of the following actions can they now successfully execute?

Accepted Answer

Prevent specific future transactions from being confirmed.

Answer

Reverse any transaction from the blockchain's entire history.

Answer

Steal cryptocurrency directly from other users' wallets.

Answer

Change the fundamental consensus rules of the protocol.

Question 6

An individual with a moderately powerful mining rig is looking for the most consistent and predictable stream of income from mining a popular Proof-of-Work cryptocurrency. Which mining approach would be most suitable?

Accepted Answer

Pool Mining

Answer

Solo Mining

Answer

Cloud Mining

Answer

Hybrid Mining

A miner successfully solves the cryptographic puzzle for a new block on a Proof-of-Work blockchain.However, due to network latency, another miner's valid block is accepted onto the main chain first.What is the term for the first miner's now-discarded block?

A miner successfully solves the cryptographic puzzle for a new block on a Proof-of-Work blockchain.
However, due to network latency, another miner's valid block is accepted onto the main chain first.
What is the term for the first miner's now-discarded block?