<p>They are signaling for Taproot. BIP 341 <a href="https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#Deployment" rel="noreferrer">specifies</a> that signaling occurs on bit 2.</p>

CC BY-SA 4.0
2021-07-06T21:22:14.120Z
2021-07-06T21:22:14.120Z
Ava Chow
<p>I've been researching into Overt (Version rolling) ASICBoost and tracking some of the latest mined blocks on <a href="https://asicboost.dance" rel="noreferrer">https://asicboost.dance</a>.</p>
<p>I've noticed that all recently mined blocks have the version ending in 4 i.e. by setting bit 2. I know that miners are signalling support for Segwit by setting bit 1. So, I'm not sure what they're signalling by setting bit 2?</p>
<p>I have been through many of the BIP documentations, but cannot seem to find any references for bit 2 being set. I've also reviewed a similar question already asked but the answer does not focus on bit 2. <a href="https://bitcoin.stackexchange.com/questions/96561/some-miners-set-the-nversion-field-of-the-block-header-to-0x8000004-what-were-t">Some miners set the nVersion field of the block header to 0x8000004. What were they signalling for? Was this an error?</a></p>

<mining-pools><bip9-version-bits><asicboost>
What are miners signalling for when the block header nversion field ends in 4 i.e. 0x3fffe004?
arikachimoaririki
# What are miners signalling for when the block header nversion field ends in 4 i.e. 0x3fffe004?

(Asked by: username_0 on 2021-07-06)

I've been researching into Overt (Version rolling) ASICBoost and tracking some of the latest mined blocks on <https://asicboost.dance>.

I've noticed that all recently mined blocks have the version ending in 4 i.e. by setting bit 2. I know that miners are signalling support for Segwit by setting bit 1. So, I'm not sure what they're signalling by setting bit 2?

I have been through many of the BIP documentations, but cannot seem to find any references for bit 2 being set. I've also reviewed a similar question already asked but the answer does not focus on bit 2. [Some miners set the nVersion field of the block header to 0x8000004. What were they signalling for? Was this an error?](https://bitcoin.stackexchange.com/questions/96561/some-miners-set-the-nversion-field-of-the-block-header-to-0x8000004-what-were-t)

**Tags:** mining-pools, bip9-version-bits, asicboost


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## 1 answers

### Answer by username_1 on 2021-07-06. Score: 10 | Accepted answer

They are signaling for Taproot. BIP 341 [specifies](https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#Deployment) that signaling occurs on bit 2.


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