A Bitcoin improvement proposal suggests increasing the block size limit from 1 MB to 2 MB. The proposal is implemented as a hard fork. What is the most likely consequence for nodes that do not upgrade?

They will automatically upgrade to the new rules to stay on the main chain.

They will continue to mine on the new chain but without validating the larger blocks.

They will reject the new 2 MB blocks and remain on the old chain, potentially causing a permanent split.

They will accept the new blocks because the block size limit is not enforced by consensus rules.

What is the purpose of the difficulty adjustment in Bitcoin mining?

To keep the average block time around 10 minutes as network hash rate changes

To ensure that only large mining pools can create blocks

To increase the block reward over time to attract more miners

To reduce the size of the block header to speed up propagation

What is a hard fork in Bitcoin?

A rule change that is not backward-compatible, causing nodes that do not upgrade to reject new blocks

A temporary network partition caused by slow block propagation

A change that only affects the mining difficulty

A change that is automatically adopted by all nodes without any action

A developer is designing a Bitcoin payment verification system for a high-frequency trading platform. The system must confirm payments within seconds, but it cannot afford to download the full blockchain. Which approach best balances speed and security?

Use a lightweight client that downloads block headers and requests Merkle proofs from a trusted full node

Run a full node and validate every transaction locally

Download the entire UTXO set periodically and verify transactions against it

Use a third-party API that returns transaction confirmations without any local verification

A developer is designing a mobile Bitcoin wallet that must verify payments quickly with minimal bandwidth. The wallet does not need to validate every transaction or enforce consensus rules. Which type of client should the developer use?

A lightweight client that downloads block headers and requests Merkle proofs

A standalone server that stores the entire UTXO set

A mining node that participates in Proof of Work

A full node that validates all transactions and blocks

EC-CouncilBlockchain Developer Certification

Domain 3Objective 1

Bitcoin and Bitcoin Blockchain Architecture BDC Practice Questions (Page 4)

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

49questions here

10free pages

9concepts

Questions 16–20

16expert · hard
A Bitcoin improvement proposal suggests increasing the block size limit from 1 MB to 2 MB. The proposal is implemented as a hard fork. What is the most likely consequence for nodes that do not upgrade?
Select an answer first
17foundation · easy
What is the purpose of the difficulty adjustment in Bitcoin mining?
Select an answer first
18foundation · easy
What is a hard fork in Bitcoin?
Select an answer first
19expert · hard
A developer is designing a Bitcoin payment verification system for a high-frequency trading platform. The system must confirm payments within seconds, but it cannot afford to download the full blockchain. Which approach best balances speed and security?
Select an answer first
20application · medium
A developer is designing a mobile Bitcoin wallet that must verify payments quickly with minimal bandwidth. The wallet does not need to validate every transaction or enforce consensus rules. Which type of client should the developer use?
Select an answer first

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