<p>EOS has blocks that are published every ~500ms, so around two blocks per second. That's a contender for the top spot for sure</p>

CC BY-SA 4.0
2020-06-22T12:10:23.573Z
2020-06-22T12:10:23.573Z
rezadru
<p>There was a coin called <a href="https://bitcointalk.org/index.php?topic=222450.0" rel="nofollow">Flashcoin</a> that tried to do 6-second block times. I don't think that's being actively mined anymore as another <a href="https://bitcointalk.org/index.php?topic=635403" rel="nofollow">Flashcoin</a> appeared a year later (60-second block times).</p>

<p><a href="http://en.wikipedia.org/wiki/Ethereum" rel="nofollow">Ethereum</a> is planning a 12-second block time. Vitalik makes an argument for why that's probably the minimum for now <a href="https://blog.ethereum.org/2014/07/11/toward-a-12-second-block-time/" rel="nofollow">here</a>. Of course, ethereum hasn't been released yet, but <a href="https://bitcointalk.org/index.php?topic=218852.0" rel="nofollow">Fastcoin</a> with its 12-second block time is probably considered the lowest block generation time currently.</p>

CC BY-SA 3.0
2015-02-06T19:20:46.727Z
2015-02-06T19:20:46.727Z
Jimmy Song
<p>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.</p>

<p>What is the shortest reasonable block interval?</p>

CC BY-SA 3.0
2015-02-07T14:32:25.173Z
Lower block time is not a feature, it's an outright bug and security risk. There are very good reasons for the 10 minutes and any alt coin that tries to sell anything less as a feature is scamming people. Shorter blocktimes waste hashing power and favor centralization.
Jannes
CC BY-SA 3.0
2015-02-13T16:24:53.070Z
Unless centralization is what you want/need
MagikCow
CC BY-SA 3.0
2015-02-13T17:51:11.653Z
if that's their evil secret plan, then yes. Honest centralization can do away with the entire blockchain and be more efficient altogether.
Jannes
<block><alternatives><altcoin-development><block-interval>
Which cryptocurrency has the smallest block time?
MagikCow
# Which cryptocurrency has the smallest block time?

(Asked by: username_0 on 2015-02-06)

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?

**Tags:** block, alternatives, altcoin-development, block-interval

> **Comments:**
> **username_1**: Lower block time is not a feature, it's an outright bug and security risk. There are very good reasons for the 10 minutes and any alt coin that tries to sell anything less as a feature is scamming people. Shorter blocktimes waste hashing power and favor centralization.  
> **username_0**: Unless centralization is what you want/need  
> **username_1**: if that's their evil secret plan, then yes. Honest centralization can do away with the entire blockchain and be more efficient altogether.  

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## 2 answers

### Answer by username_3 on 2015-02-06. Score: 3 | Accepted answer

There was a coin called [Flashcoin](https://bitcointalk.org/index.php?topic=222450.0) that tried to do 6-second block times. I don't think that's being actively mined anymore as another [Flashcoin](https://bitcointalk.org/index.php?topic=635403) appeared a year later (60-second block times).

[Ethereum](http://en.wikipedia.org/wiki/Ethereum) is planning a 12-second block time. Vitalik makes an argument for why that's probably the minimum for now [here](https://blog.ethereum.org/2014/07/11/toward-a-12-second-block-time/). Of course, ethereum hasn't been released yet, but [Fastcoin](https://bitcointalk.org/index.php?topic=218852.0) with its 12-second block time is probably considered the lowest block generation time currently.


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### Answer by username_2 on 2020-06-22. Score: 3

EOS has blocks that are published every ~500ms, so around two blocks per second. That's a contender for the top spot for sure


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