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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.)

AUnplanned Fork

BDouble Spending

CCancelling Transactions

DPlanned Fork

ESelfless Mining

Show Suggested 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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Joaquin

1 month ago

I think an unplanned fork could happen too.

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Glory

1 month ago

Definitely double spending is a big risk!

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Kenda

2 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

2 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

2 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

2 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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