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Blockchain CBSA Exam - Topic 7 Question 101 Discussion

What are some likely repercussions that could occur as a result of a 51% attack to the Bitcoin network? (Select three.)
A) Unplanned Fork and B) Double Spending and C) Cancelling Transactions
D) Planned Fork
E) Selfless Mining

Blockchain CBSA Exam - Topic 7 Question 101 Discussion

Actual exam question for Blockchain's CBSA exam
Question #: 101
Topic #: 7
[All CBSA Questions]

What are some likely repercussions that could occur as a result of a 51% attack to the Bitcoin network? (Select three.)

Show Suggested Answer Hide Answer
Suggested Answer: A, B, C

The 4 main attacks that can happen directly as a result of the 51% attack are: Selfish mining. Cancelling transactions. Double Spending. Random forks.


by Lili at Apr 09, 2026, 03:22 AM

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Alysa
7 days ago
I agree with B and C. Trust is everything in crypto!
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Jaleesa
12 days ago
C is crucial. Cancelling transactions would lead to chaos.
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Curtis
17 days ago
I feel like A is a strong choice. Unplanned forks can disrupt everything.
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Carisa
22 days ago
Definitely B! Double spending would be a nightmare for transactions.
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Mitsue
27 days ago
A and C seem likely too. Unplanned forks can confuse users.
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Melodie
1 month ago
I think B is a big risk. Double spending could ruin trust.
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Caprice
1 month ago
A planned fork? That's a stretch, isn't it?
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Celeste
1 month ago
Totally agree, double spending is a major concern!
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Alex
2 months ago
Wait, can they really cancel transactions? Sounds fishy.
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Shenika
2 months ago
I think an unplanned fork could happen too.
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Lauran
2 months ago
Definitely double spending is a big risk!
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Theodora
2 months ago
A planned fork? That's a stretch, isn't it?
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Colette
2 months ago
Totally agree, double spending is a major concern!
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Mona
2 months ago
Wait, can they really cancel transactions? Sounds fishy.
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Joaquin
4 months ago
I think an unplanned fork could happen too.
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Glory
4 months ago
Definitely double spending is a big risk!
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Kenda
5 months ago
I’m leaning towards double spending and maybe a planned fork, but I’m not confident about the third option. I wish we had more practice questions on this topic!
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Angelyn
5 months ago
Cancelling transactions seems plausible too. I feel like we discussed how attackers could manipulate the network to invalidate transactions.
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Merri
5 months ago
I’m not entirely sure about the unplanned fork. I remember it being mentioned, but I can’t recall if it’s a direct result of a 51% attack.
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Ryan
5 months ago
I think double spending is definitely one of the repercussions. It’s like what we practiced in that case study about blockchain vulnerabilities.
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