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Author Topic: Bitcoin Block time  (Read 399 times)
konfuzius5278
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August 13, 2018, 02:53:32 PM
 #21

It is a measure of how long it will take the hashing power of the network to find a solution to the block hash. The difficulty is calculated proportionally to the hashing power so that, on average, the block time is 10 minutes for Bitcoin. In reality, block times can vary. It is different for each Cryptocurrency.

Mmmmh thats nothing new. My problem is when the core client suggest a fee I use it. And when I use the fee for 20 min and it takes 3 hours with twice double the fee, it is lets say difficult for payment

By the way one of my post was deleted. So as I said crypto community should not see BTC as the holy cow.
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August 14, 2018, 06:18:21 AM
 #22

It is a measure of how long it will take the hashing power of the network to find a solution to the block hash. The difficulty is calculated proportionally to the hashing power so that, on average, the block time is 10 minutes for Bitcoin. In reality, block times can vary. It is different for each Cryptocurrency.

Mmmmh thats nothing new. My problem is when the core client suggest a fee I use it. And when I use the fee for 20 min and it takes 3 hours with twice double the fee, it is lets say difficult for payment

This is completely unrelated to the post you were quoting.
A transaction with a calculated fee (the fee is just an estimation of getting a confirmation after X minutes) does not have to confirm within this timeframe. This is depending on multiple factors.
The amount of transactions inside the mempool could increase, making your fee which currently was totally fine to get a confirmation the next block now isn't enough to get it confirmed within 10 blocks.
Or no blocks are being found at the moment. The difficulty still stays the same. And so does the average block time of 10 minutes. But 2 hours without a block isn't that unusual. But 3 Blocks within 10 minutes aren't that unusual either.

All these calculations of a fee are just a estimation. If you want to better estimate the fee, take a look at https://jochen-hoenicke.de/queue/#1,8h. You will be able to guess the fee to use pretty clearly.

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August 14, 2018, 06:02:29 PM
 #23


This is completely unrelated to the post you were quoting.
A transaction with a calculated fee (the fee is just an estimation of getting a confirmation after X minutes) does not have to confirm within this timeframe. This is depending on multiple factors.
The amount of transactions inside the mempool could increase, making your fee which currently was totally fine to get a confirmation the next block now isn't enough to get it confirmed within 10 blocks.
Or no blocks are being found at the moment. The difficulty still stays the same. And so does the average block time of 10 minutes. But 2 hours without a block isn't that unusual. But 3 Blocks within 10 minutes aren't that unusual either.

All these calculations of a fee are just a estimation. If you want to better estimate the fee, take a look at https://jochen-hoenicke.de/queue/#1,8h. You will be able to guess the fee to use pretty clearly.


But still,  OP  is paying more fees for a speedier transaction (might user want to payment to be processed (a single confirmation) within an hour.
User put high fees in transaction , so that it will be confirmed in the next block.
If next block is not getting mined in next 3 hours then doing payment in next 1 hour is impossible for user whatever the fees user is paying.
Actually OP is saying he want to do speedier transaction by putting more fees but block mining speed becomes a limiting factor.

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August 17, 2018, 11:15:25 AM
 #24

n a more simple words, Block time is the time which the networks takes to generate one extra block or the time taken from one Block to another.No one can say exactly how much Block Time will it take to mine another. The 10 minute window is just an average. There is a generation calculator that will tell you how long it might take to mine a block.
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August 17, 2018, 03:17:55 PM
 #25

n a more simple words, Block time is the time which the networks takes to generate one extra block or the time taken from one Block to another.No one can say exactly how much Block Time will it take to mine another. The 10 minute window is just an average. There is a generation calculator that will tell you how long it might take to mine a block.

Someone with good statics knowlege could calculate how average the block time is really. So normally it should be a Gauss normal distribution with the maximum at 10 mins. But it is not, cause e.g. miners are activated or deactivated and difficulty can not react. Look how many blocks are found exactly 10 mins after the last one or even 11 or 9 min.


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August 21, 2018, 06:05:48 PM
 #26

I am really wondering about BTC Block Time.

This morning only 6 Block found in 2 hours. Of course it depends on luck. But it depends also an HASH Rate. This is so enormous high and only adaped every 2 weeks.

Why does the biggest coin does not solve this difficulty problem? And why still more and more miners start so that the difficulty rises without watching the price.

In theory bitcoin have blocks each 10 minutes, that mean 6 blocks each hour, and i say in theory because as you say before, some time we see a low number of blocks in lot of time. but at the same time i have seen before 3 blocks back to back.

As you say, bitcoin haven't fix this issue yet, and this was one of the fork reasons, bitcoin cash brings a solution where the difficulty changes each block. So if you don't like bitcoin for this reason i recommend you to give a try to bch. And lets wait to see if bitcoin take the solutions that bch brings for this issue.  

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bob123
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August 22, 2018, 10:51:26 AM
 #27

As you say, bitcoin haven't fix this issue yet, 

Who said it is an issue ?
This isn't an issue at all. It is necessary.

The adjustment each 2016 blocks is to keep a 10 minute average.



and this was one of the fork reasons, bitcoin cash brings a solution where the difficulty changes each block. 

Changing difficulty each block is a horrible approach.
Mining a block is based on luck. And in a period with 2 or 3 blocks being mined successively the algorithm would adjust the difficulty to a level which practically wouldn't be mineable anymore.
Not to mention what kind of potential for abuse this offers.

That is the reason the interval of 2 weeks (2016 blocks with a 10-minute block time) has been chosen.
To adjust fast enough to not create a death spiral and to adjust slow enough to not get affected too much from short streaks with multiple blocks caused by 'luck' or an heavily increasing hashrate.



So if you don't like bitcoin for this reason i recommend you to give a try to bch.

 Roll Eyes



And lets wait to see if bitcoin take the solutions that bch brings for this issue.   

An algorithm for difficulty adjustment should be a working feature (e.g. BTC). Not an issue or something 'necessary' which needs adjustments and optimization to somehow work stable (e.g. BCH).


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August 22, 2018, 12:02:16 PM
 #28

As I mentioned before it is never a 10 min average. It is NOT a Gauss normal function.

The reason I do this discussion is that people dont want to hear about other crypto for payment. I dont understand
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August 22, 2018, 09:34:03 PM
 #29

Someone with good statics knowlege could calculate how average the block time is really. So normally it should be a Gauss normal distribution with the maximum at 10 mins. But it is not, cause e.g. miners are activated or deactivated and difficulty can not react. Look how many blocks are found exactly 10 mins after the last one or even 11 or 9 min.
There is no maximum on the time between blocks, so there is no maximum at 10 minutes. The distribution time between blocks is not a normal distribution. Rather it is poisson with the true mean at ~9.7 minutes. The difficulty adjusts to make it 10 minutes, but new hardware coming online pulls the time down. Since it is poisson, the time can vary a lot, from 0 minutes to several hours, there is no maximum at 10 minutes.

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August 22, 2018, 10:15:31 PM
 #30

Someone with good statics knowlege could calculate how average the block time is really. So normally it should be a Gauss normal distribution with the maximum at 10 mins. But it is not, cause e.g. miners are activated or deactivated and difficulty can not react. Look how many blocks are found exactly 10 mins after the last one or even 11 or 9 min.
There is no maximum on the time between blocks, so there is no maximum at 10 minutes. The distribution time between blocks is not a normal distribution. Rather it is poisson with the true mean at ~9.7 minutes. The difficulty adjusts to make it 10 minutes, but new hardware coming online pulls the time down. Since it is poisson, the time can vary a lot, from 0 minutes to several hours, there is no maximum at 10 minutes.
The true mean for bitcoin since genesis block up to now, is ~9.4 minutes last time I calculated this divergence. How did you get 9.7?
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August 23, 2018, 06:23:08 AM
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 #31

The reason I do this discussion is that people dont want to hear about other crypto for payment. I dont understand

Then you, merchant, payment processor or payment gateway should consider use/accept zero-confirmation, it's not too risky if it's for small payment and any explorer/nodes don't detect double-spend attempt (with sufficient fee obviously).
CPFP also help if you want to use your bitcoin immediately.

Someone with good statics knowlege could calculate how average the block time is really. So normally it should be a Gauss normal distribution with the maximum at 10 mins. But it is not, cause e.g. miners are activated or deactivated and difficulty can not react. Look how many blocks are found exactly 10 mins after the last one or even 11 or 9 min.
There is no maximum on the time between blocks, so there is no maximum at 10 minutes. The distribution time between blocks is not a normal distribution. Rather it is poisson with the true mean at ~9.7 minutes. The difficulty adjusts to make it 10 minutes, but new hardware coming online pulls the time down. Since it is poisson, the time can vary a lot, from 0 minutes to several hours, there is no maximum at 10 minutes.
The true mean for bitcoin since genesis block up to now, is ~9.4 minutes last time I calculated this divergence. How did you get 9.7?

AFAIK that was mean in few years ago. My rough calculation also show 9.4 minutes mean time.


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