<p>Actually they are all wrong:</p>
<p>A. Some sellers may accept one block (one confirmation) for small-value transactions that are time sensitive like buying a coffee.</p>
<p>B. Some sellers will want six confirmations for high value transactions where a one hour delay is acceptable. Like buying a house.</p>
<p>C. D. It isn't the number of leading zeroes that is tested. Only that the hash is numerically <em>less than</em> the current target number.</p>
<p>D. The reward cannot be spent until 100 blocks have been mined on top of the block. So the reward is not really realized at the time of finding the block with the required hash. Also, because of naturally occurring blockchain forks, some miners will occasionally have a block made extinct and any associated reward will be void. Because of the reward halving process, eventually in some future decade, miners will receive no reward for mining (only transaction fees).</p>
<p>E. It isn't the longest chain but the chain with the highest cumulative amount of work that gets chosen.</p>
<p>So, all wrong but also all pretty close to the truth.</p>

CC BY-SA 4.0
2020-12-10T13:14:46.523Z
Not all answers are wrong
R0bert
CC BY-SA 4.0
2020-12-10T13:17:46.563Z
@R0bert. Your homework evaluator may have some answers they are looking for but the truth is all the statements are wrong in the way I described. Any expert will confirm this to you.
RedGrittyBrick
CC BY-SA 4.0
2020-12-10T12:55:57.763Z
2020-12-10T14:14:40.730Z
2020-12-10T14:14:40.730Z
RedGrittyBrick
<p>Which of the following statements about blockchain are correct?</p>
<p>A) A transaction is accepted once it is included in some block.</p>
<p>B) A transaction is accepted once it is included in a block that is at least 6 blocks deep.</p>
<p>C) The number of leading zeros required for the hash value of a block is dynamically
changing over time.</p>
<p>D) A miner gets a reward whenever it finds a block that hashes to a value with required
number of leading zeros.</p>
<p>E) Consensus is achieved by proof of work and the longest chain rule.</p>
<p><strong>My Attempt:</strong></p>
<p>B,D,E</p>
<p>B - I came to know from <a href="https://en.bitcoin.it/wiki/Confirmation" rel="nofollow noreferrer">Wikipedia</a></p>
<p>I know the D,E are correct but I'm not sure about the B. Can you please tell me if my above options are correct or not.</p>

CC BY-SA 4.0
2020-12-10T07:01:01.247Z
Is this some HW question :) ?
sanket1729
<client><cryptography>
Finding the current statements about bitcoin
R0bert
# Finding the current statements about bitcoin

(Asked by: username_0 on 2020-12-09)

Which of the following statements about blockchain are correct?

A) A transaction is accepted once it is included in some block.

B) A transaction is accepted once it is included in a block that is at least 6 blocks deep.

C) The number of leading zeros required for the hash value of a block is dynamically
changing over time.

D) A miner gets a reward whenever it finds a block that hashes to a value with required
number of leading zeros.

E) Consensus is achieved by proof of work and the longest chain rule.

**My Attempt:**

B,D,E

B - I came to know from [Wikipedia](https://en.bitcoin.it/wiki/Confirmation)

I know the D,E are correct but I'm not sure about the B. Can you please tell me if my above options are correct or not.

**Tags:** client, cryptography

> **Comments:**
> **username_1**: Is this some HW question :) ?  

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## 1 answers

### Answer by username_2 on 2020-12-10. Score: 1

Actually they are all wrong:

A. Some sellers may accept one block (one confirmation) for small-value transactions that are time sensitive like buying a coffee.

B. Some sellers will want six confirmations for high value transactions where a one hour delay is acceptable. Like buying a house.

C. D. It isn't the number of leading zeroes that is tested. Only that the hash is numerically *less than* the current target number.

D. The reward cannot be spent until 100 blocks have been mined on top of the block. So the reward is not really realized at the time of finding the block with the required hash. Also, because of naturally occurring blockchain forks, some miners will occasionally have a block made extinct and any associated reward will be void. Because of the reward halving process, eventually in some future decade, miners will receive no reward for mining (only transaction fees).

E. It isn't the longest chain but the chain with the highest cumulative amount of work that gets chosen.

So, all wrong but also all pretty close to the truth.

> **Comments:**
> **username_0**: Not all answers are wrong  
> **username_2**: @username_0. Your homework evaluator may have some answers they are looking for but the truth is all the statements are wrong in the way I described. Any expert will confirm this to you.  

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