What is the primary purpose of a Merkle tree in a Bitcoin block?

To order transactions by their timestamp within the block

To compress the block size by removing duplicate transactions

To efficiently verify that a transaction is included in a block without downloading all transactions

To encrypt the transaction data so only miners can read it

A developer is designing a system that allows users to prove they own a specific transaction in a block without revealing the entire block. The system must minimize the amount of data sent to the user. Which approach is most efficient?

Provide the Merkle root and the transaction's position in the block

Provide the block header and the transaction's raw data

Provide the transaction hash and a Merkle proof containing the sibling hashes along the path to the root

Provide the entire block to the user

A blockchain startup is designing a new cryptocurrency and wants to use a proof-of-work consensus mechanism similar to Bitcoin. The team is debating how to set the block time and difficulty adjustment. Which design choice best mirrors Bitcoin's approach and why?

Keep the difficulty fixed and rely on the network hashrate to naturally produce blocks at the desired rate.

Adjust the difficulty after every block based on the time of the previous block.

Set a target average block time and adjust the difficulty every fixed number of blocks based on the actual time taken.

Set the difficulty based on the number of transactions in the mempool.

What is the block reward in Bitcoin?

The transaction fees collected from all transactions in the block

The total value of all UTXOs in the block

The amount of bitcoin paid by users to have their transactions included

The newly created bitcoins awarded to the miner who successfully mines a block

EC-CouncilBlockchain Developer Certification

Domain 3Objective 1

Bitcoin and Bitcoin Blockchain Architecture BDC Practice Questions (Page 5)

Part of the Bitcoin and Consensus Mechanisms domain, which makes up ~12% of our current practice bank.

49questions here

10free pages

9concepts

Questions 21–25

21foundation · easy
What is the primary purpose of a Merkle tree in a Bitcoin block?
Select an answer first
22expert · hard
A developer is designing a system that allows users to prove they own a specific transaction in a block without revealing the entire block. The system must minimize the amount of data sent to the user. Which approach is most efficient?
Select an answer first
23expert · hard
A blockchain startup is designing a new cryptocurrency and wants to use a proof-of-work consensus mechanism similar to Bitcoin. The team is debating how to set the block time and difficulty adjustment. Which design choice best mirrors Bitcoin's approach and why?
Select an answer first
24foundation · easy
What is the block reward in Bitcoin?
Select an answer first
25application · easy
A developer is implementing a Merkle tree for a block with 5 transactions. How many leaf nodes will the tree have if it is built as a standard binary Merkle tree?
Select an answer first

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