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

Limited Time Offer

25%

Off

Get Premium CBSA Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Kenda

5 days 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!

upvoted 0 times

...

Angelyn

10 days ago

Cancelling transactions seems plausible too. I feel like we discussed how attackers could manipulate the network to invalidate transactions.

upvoted 0 times

...

Merri

15 days 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.

upvoted 0 times

...

Ryan

20 days ago

I think double spending is definitely one of the repercussions. It’s like what we practiced in that case study about blockchain vulnerabilities.

upvoted 0 times

...