<p>This warning is currently benign and has been fixed for Bitcoin Core 0.18. You see it because miners are using the block version number for a mining optimization called ASICBOOST. However soft forks in the past have used the version number for readiness signalling. Bitcoin Core is seeing version numbers it is not expecting (due to ASICBOOST) and thus triggering the warning.</p>

CC BY-SA 4.0
2019-04-03T04:32:35.260Z
Thank you very much for answering. You clarify the situation very well and give me peace of mind to continue contributing to the bitcoin network.
Oriebla
CC BY-SA 4.0
2019-04-03T04:08:11.487Z
2019-04-03T04:08:11.487Z
Ava Chow
<p>Best regards.
What's going on internally when I get this warning.</p>

<p>Warning: Unknown block versions are being mined! Unknown rules may be active</p>

<p>Bitcoin Core version v0.17.1 (64-bit)</p>

<p>Thank you</p>

CC BY-SA 4.0
2020-06-19T06:39:45.573Z
Does this answer your question? [Unusual Version Number in Blocks](https://bitcoin.stackexchange.com/questions/79273/unusual-version-number-in-blocks)
MCCCS
<bitcoin-core><asicboost>
Warning: Unknown block versions are being mined! Unknown rules may be active
Oriebla
# Warning: Unknown block versions are being mined! Unknown rules may be active

(Asked by: username_0 on 2019-04-03)

Best regards.
What's going on internally when I get this warning.

Warning: Unknown block versions are being mined! Unknown rules may be active

Bitcoin Core version v0.17.1 (64-bit)

Thank you

**Tags:** bitcoin-core, asicboost

> **Comments:**
> **username_1**: Does this answer your question? [Unusual Version Number in Blocks](https://bitcoin.stackexchange.com/questions/79273/unusual-version-number-in-blocks)  

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## 1 answers

### Answer by username_2 on 2019-04-03. Score: 11 | Accepted answer

This warning is currently benign and has been fixed for Bitcoin Core 0.18. You see it because miners are using the block version number for a mining optimization called ASICBOOST. However soft forks in the past have used the version number for readiness signalling. Bitcoin Core is seeing version numbers it is not expecting (due to ASICBOOST) and thus triggering the warning.

> **Comments:**
> **username_0**: Thank you very much for answering. You clarify the situation very well and give me peace of mind to continue contributing to the bitcoin network.  

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