A central securities depository is evaluating PBFT-based consensus for a private settlement network. The primary requirement is that transactions must be final immediately after consensus, with no possibility of reorganization. Which trade-off is most likely to be accepted in this design?

Lower throughput due to multi-round voting

Increased energy consumption due to mining

Higher latency due to probabilistic finality

Reduced security due to permissionless participation

A cryptocurrency exchange is monitoring the Bitcoin network and notices a block that was previously considered confirmed has been orphaned. What is the most likely cause?

The miners decided to reverse the block

The block was invalid due to a double-spend

A competing block was mined and the network adopted a longer chain

In the context of blockchain consensus, what does the term 'finality' refer to?

The guarantee that a confirmed transaction cannot be altered or reversed

The speed at which a transaction is included in a block

The process of verifying the identity of transaction participants

The total number of nodes that validate a transaction

A staking pool on a PoS blockchain wants to minimize the risk of validators being penalized for actions that could lead to a chain reorg. Which validator behavior should the pool explicitly prohibit?

Signing two different blocks at the same height

A merchant accepts Bitcoin payments and ships goods after receiving 6 confirmations. A deep chain reorganization occurs, and the merchant's transaction is no longer in the main chain. What is the most likely consequence?

The merchant may have shipped goods without receiving final settlement

The merchant's node will reject the new chain

The transaction will be automatically re-included in the next block

The transaction is still considered final because 6 confirmations are absolute

EC-CouncilBlockchain Fintech Certification

Domain 2Objective 4

Finality in Blockchain Consensus BFC Practice Questions (Page 4)

Part of the Consensus Mechanisms for Financial Systems domain, which makes up ~11% of our current practice bank.

45questions here

9free pages

8concepts

Questions 16–20

16application · medium
A central securities depository is evaluating PBFT-based consensus for a private settlement network. The primary requirement is that transactions must be final immediately after consensus, with no possibility of reorganization. Which trade-off is most likely to be accepted in this design?
Select an answer first
17application · medium
A cryptocurrency exchange is monitoring the Bitcoin network and notices a block that was previously considered confirmed has been orphaned. What is the most likely cause?
Select an answer first
18foundation · easy
In the context of blockchain consensus, what does the term 'finality' refer to?
Select an answer first
19application · medium
A staking pool on a PoS blockchain wants to minimize the risk of validators being penalized for actions that could lead to a chain reorg. Which validator behavior should the pool explicitly prohibit?
Select an answer first
20application · medium
A merchant accepts Bitcoin payments and ships goods after receiving 6 confirmations. A deep chain reorganization occurs, and the merchant's transaction is no longer in the main chain. What is the most likely consequence?
Select an answer first

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