Questions tagged [block-interval]

Questions concerned with the expected or actual time between the discovery of two blocks.

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52
votes
4answers
30k views

What keeps the average block time at 10 minutes?

I've been told "the network" sets the difficulty level such that there will be one new block mined every ten minutes. I imagine the rich would instead prefer to keep difficulty as high as possible to ...
18
votes
1answer
7k views

What is the expected time until the next block is found?

https://bitcoin.stackexchange.com/a/3908/659 says: Luckily, you'll only have to wait five minutes on average for a block to be found (blocks are one every ten minutes, so the expected delay until ...
44
votes
4answers
16k views

Why was the target block time chosen to be 10 minutes?

According to the wiki, 10 minutes was chosen as a 'tradeoff'. Why ten minutes specifically? It is a tradeoff chosen by Satoshi between propagation time of new blocks in large networks and the ...
15
votes
1answer
974 views

Would a reduced block generation time make the Finney attack more difficult?

Related Question: What can be done to mitigate the risk of a Finney attack? The Finney attack is a form of double-spending attack where the attacker pre-mines a block containing a conflicting ...
4
votes
1answer
433 views

Why is a short blocktime considered to be unsafe?

I've heard a couple of times "a shorter blocktime is unsafe," (first about Litecoin and now Ethereum) but never understood why. Is it the higher probability of a fork? Why do some people consider a ...
3
votes
1answer
2k views

Which cryptocurrency has the smallest block time?

What is the lowest block time of any cryptocurrency? I don't mean the time of an individual block, but the target time per block. What is the shortest reasonable block interval?
2
votes
1answer
727 views

Why not decrease the difficulty to increase capacity?

There is a persistent debate in Bitcoin about increasing the capacity. The popular idea seems to be to increase the blocksize from its current 1MB to push through more transactions per block. But ...
2
votes
1answer
1k views

What would happen if 90% of the Bitcoin miners suddenly stopped mining?

What would happen if 90% of the Bitcoin miners were to suddenly stop mining Bitcoin, i.e. the Bitcoin network's hashing power would drop to 10% of the previous amount. Would it become more difficult ...
6
votes
2answers
2k views

What stops miners/nodes lying about what time a block was mined?

From what I understand, the difficulty required by the proof-of-work in bitcoin is a function of block history, specifically the average time between last ~2000 blocks, with the intention that its ...
8
votes
3answers
748 views

Why is Poisson instead of Negative Binomial used for computing attacker's potential progress?

In chapter 11 of the Satoshi's paper it is claimed that: The recipient waits until the transaction has been added to a block and z blocks have been linked after it. He doesn't know the exact ...
6
votes
3answers
2k views

Shortest and Longest block interval time ever recorded in Bitcoin

Bitcoin block interval time is on average 10 minutes, that is the difficulty is adjusted in such a way that every 10 minutes a miner will manage to find the right hash. This is just an average time ...
0
votes
1answer
378 views

The probability of block generation by two miners in a special case?

If network would include 2 mining pools (pool_1 and pool_2) with the hashpower of 49% and 51%,respectively, then wo want to calculate the probability that in 10 minutes, exactly 2 blocks would be ...
9
votes
2answers
3k views

What is the longest time gap between blocks in 2010 - 2011?

I notice on blockexplorer that block 159531 was mined at 2011-12-28 10:53:53 and the next block was mined at 2011-12-28 11:24:58 - a gap of more than half an hour. I know the 10-minutes-per-block rule ...
8
votes
1answer
1k views

What is the standard deviation of block generation times?

A block is generated every 10 minutes, on average. What is the standard deviation of this distribution? It seems to be a measurable property, not a calculable one. Is there a chart of the standard ...
5
votes
1answer
484 views

How does mining process takes Approximately 10 minutes?

I don't think that I fully understood the "difficulty" topic in blockchain, and therefore I don't understand how mining process takes close to 10 minutes. If I have "Target" value (some hash value, ...
4
votes
2answers
210 views

Why is average time for block 8 minutes, when the target is recomputed to keep it 10 minutes?

I found out that the average time per block (based on the last 10 000 blocks) is 464 seconds - something under 8 minutes. http://blockexplorer.com/q/interval/10000 However, I thought that the target ...
3
votes
3answers
435 views

Would it be possible to make a functional Bitcoin fork that confirmed a block of transactions every millisecond?

How fast could you possibly run a blockchain like bitcoins'? Could blocks be added as fast as a microsecond while still having a functional currency?
3
votes
2answers
146 views

Why we need mining?

I know is related to these: What is the rationale behind Bitcoin mining? Why do we need Proof of Work in bitcoin? But I don't fully understand those answers, and I think usually is much easier to ...
2
votes
2answers
199 views

Why was the time between these two blocks not approximately 10 minutes?

A new block will be created in approximately 10 minutes, but I saw on blockchain.info that these two blocks were found only two minutes apart! How come that the time between the first two listed ...
2
votes
1answer
212 views

“Instantaneous” transaction verification?

Jan Moritz Lindemann graciously educated me that difficulty is used not only to regulate the creation rate of a cryptocurrency but also to allow for block propagation thus prevent orphaned blocks. ...
2
votes
1answer
222 views

Why not multiply “six confirmations” and divide Time-Between-Blocks and Reward by the same factor?

It seems that choosing a good factor to use to expand Bitcoin's capacity is a good idea. The software would divide some of its calculated values by this factor, such as the target time between blocks ...