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Blockchain CBSA Exam - Topic 6 Question 90 Discussion

In Ethereum how is the block difficulty determined in Ethereum?
A) The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.
B) The Block Difficulty is determined by the Ethereum Committee every fortnight to reflect the average amount of transaction and it cannot be influenced by the network itself.
C) The Block Difficulty increases when the time between mined blocks is below 20 seconds, while it decreases when the tie is above 60 seconds.

Blockchain CBSA Exam - Topic 6 Question 90 Discussion

Actual exam question for Blockchain's CBSA exam
Question #: 90
Topic #: 6
[All CBSA Questions]

In Ethereum how is the block difficulty determined in Ethereum?

Show Suggested Answer Hide Answer
Suggested Answer: A

At the time of writing these lines, the Ethereum Blockchain still runs on Proof of Work. When a block is mined, the miner node selects some transactions from a pool of pending transactions. Usually they are sorted by how much gas they would bring in. These transactions are executed and incorporated in the new block. But a block also contains two very important parameters: a difficulty and a timestamp. The difficulty regulates how hard it is to find a block by the miner. The mining time is set to be between 10 and 20 seconds. If it's beyond 20 seconds, the difficulty is too high and will be automatically lowered going forward. If the mining happens below 10 seconds, then the difficulty increases. The timestamp is the time when a miner found the block. It is not automatically derived, rather it is set by the miner itself and can thus be influenced to a certain degree. The timestamp does not depend on the time zone, as it's the standard Unix timestamp.


by Jesusita at Jul 08, 2025, 12:13 PM

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Shawnda
9 months ago
C sounds off, I don't remember 60 seconds being a thing.
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Kayleigh
9 months ago
Definitely A! Makes sense.
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Justine
9 months ago
B is totally wrong, the network influences it!
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Cory
9 months ago
Wait, is it really that simple?
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Judy
10 months ago
I think it's A, right?
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Carey
10 months ago
I’m leaning towards option A, but I’m confused about the exact numbers. I feel like I’ve seen different values in other practice questions.
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Katie
10 months ago
I remember something about the Ethereum network adjusting difficulty, but I thought it was more about the average transaction volume rather than specific time intervals.
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Bea
10 months ago
I practiced a similar question, and I feel like the correct answer has to do with 10 and 20 seconds, but I'm not entirely sure.
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Deeanna
10 months ago
I think the block difficulty is adjusted based on the time between blocks, but I can't remember the exact thresholds.
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Nieves
11 months ago
I'm pretty sure the block difficulty is not determined by an Ethereum committee, so option B is definitely wrong. I think it has to do with the network's ability to mine blocks in a certain timeframe, but I'm not 100% sure of the details. I'll have to make an educated guess on this one.
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Gearldine
11 months ago
Okay, let me see if I can work this out. I believe the block difficulty is automatically adjusted by the network to maintain a target block time, but I'm not sure of the exact numbers. I'll have to review my notes on Ethereum consensus mechanisms.
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Francoise
11 months ago
Hmm, I'm a bit unsure about this one. I know the block difficulty is somehow related to the time between blocks, but I can't remember the exact thresholds. I'll have to think this through carefully.
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Simona
11 months ago
I'm pretty confident I know how the block difficulty is determined in Ethereum. I think it's option A, where the difficulty increases when the time between blocks is below 10 seconds and decreases when it's above 20 seconds.
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Angelica
1 year ago
I'm voting for Option A. Gotta keep those blocks coming at a steady pace, you know?
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Ora
1 year ago
I think the Ethereum Committee determines the block difficulty every fortnight, so option B might be the correct answer.
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Mozell
1 year ago
I disagree, I think option C is more accurate as the block difficulty increases when the time is below 20 seconds.
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Latricia
1 year ago
I believe option A is correct, as the block difficulty increases when the time is below 10 seconds.
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Giovanna
1 year ago
Wait, so the Ethereum Committee is like the Federal Reserve of crypto? That's hilarious!
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Valentine
12 months ago
C) The Block Difficulty increases when the time between mined blocks is below 20 seconds, while it decreases when the tie is above 60 seconds.
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Shizue
12 months ago
C) The Block Difficulty increases when the time between mined blocks is below 20 seconds, while it decreases when the tie is above 60 seconds.
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Fatima
12 months ago
A) The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.
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Delmy
1 year ago
B) The Block Difficulty is determined by the Ethereum Committee every fortnight to reflect the average amount of transaction and it cannot be influenced by the network itself.
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Antione
1 year ago
A) The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.
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Meaghan
1 year ago
I think the block difficulty in Ethereum is determined by the time between mined blocks.
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Dominga
1 year ago
Option C looks good to me. Seems like a reasonable range for block time adjustments.
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Viva
1 year ago
I'm not sure about Option B. Doesn't the network itself determine the difficulty based on the hash rate?
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Keena
1 year ago
A) The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.
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Annelle
1 year ago
C) The Block Difficulty increases when the time between mined blocks is below 20 seconds, while it decreases when the tie is above 60 seconds.
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Rocco
1 year ago
A) The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.
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Van
1 year ago
Option A seems logical, as the network should adjust difficulty to maintain a consistent block time.
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Ahmed
1 year ago
User 3: Yeah, it's important for the network to adjust difficulty accordingly.
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Marleen
1 year ago
User 2: That makes sense, it helps maintain a consistent block time.
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Josephine
1 year ago
User 1: I think the block difficulty increases when the time between mined blocks is below 10 seconds.
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