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Blockchain CBDE Exam - Topic 5 Question 129 Discussion

What are Private Keys used for?
B) To Sign Transactions And To Derive an Address From.
A) To Protect the Public Keys by being cryptographically significant.
C) To Generate An Address which can sign transactions.

Blockchain CBDE Exam - Topic 5 Question 129 Discussion

Actual exam question for Blockchain's CBDE exam
Question #: 129
Topic #: 5
[All CBDE Questions]

What are Private Keys used for?

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Suggested Answer: B

by Skye at Jun 16, 2026, 09:50 PM

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Domingo
17 days ago
I feel like they also help derive addresses. So, B is solid!
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Marion
22 days ago
Definitely! Option B makes the most sense to me.
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Tiera
27 days ago
I think private keys are crucial for signing transactions.
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Danica
1 month ago
They also sign transactions, that's a key function!
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Destiny
1 month ago
I thought public keys were enough, why do we need private ones?
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Hyman
1 month ago
Wait, can they really derive an address? Sounds sketchy.
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Dorcas
2 months ago
Totally agree, they keep your assets safe.
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Martha
2 months ago
Private keys are super important for security!
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Sunny
2 months ago
I’m confused about option C; I thought addresses were derived from public keys, not private ones.
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Tiara
2 months ago
I feel like option B is the right answer since it mentions signing transactions, which is definitely a key function of private keys.
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Andra
2 months ago
I remember practicing a question about how private keys protect public keys, but I can't recall the exact details.
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Sunshine
2 months ago
I think private keys are mainly used to sign transactions, but I'm not entirely sure if they also derive addresses.
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