<p>I'm trying to parse the blockchain directly from the .dat files. The parser works well up until I run into these blocks, with the version appearing as "d9b4bef9" (already reversed).</p>

<p>What is this version, and what special rules does it have?</p>

CC BY-SA 3.0
2015-11-23T20:28:51.983Z
I don't think that *is* a version. I think that's the protocol magic bytes: https://en.bitcoin.it/wiki/Protocol_documentation#Message_structure
Nick ODell
CC BY-SA 4.0
2018-06-09T15:55:56.083Z
https://www.yours.org/content/the-true-satoshi-nakamoto-0f396f07b417
Richard Anthony Hein
<blockchain><block><bip9-version-bits>
What block version is this: d9b4bef9 (decimal: 3652501241)?
Fernando Tiberti
# What block version is this: d9b4bef9 (decimal: 3652501241)?

(Asked by: username_0 on 2015-11-23)

I'm trying to parse the blockchain directly from the .dat files. The parser works well up until I run into these blocks, with the version appearing as "d9b4bef9" (already reversed).

What is this version, and what special rules does it have?

**Tags:** blockchain, block, bip9-version-bits

> **Comments:**
> **username_1**: I don't think that *is* a version. I think that's the protocol magic bytes: https://en.bitcoin.it/wiki/Protocol_documentation#Message_structure  
> **username_2**: https://www.yours.org/content/the-true-satoshi-nakamoto-0f396f07b417  

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## 0 answers

