<p>It is the 2-logarithm of the expected number of block header hash attempts were necessary the build the chain up to that point.</p>
<p>For example, for block <em>768557</em>, the <code>log2_work</code> is 93.909086. This means that roughly <em>2<sup>93.909086</sup> = 1.85973 ⨉ 10<sup>28</sup></em> block hash attempts (each roughly a double-SHA256 operation) have been attempted.</p>

CC BY-SA 4.0
2022-12-22T23:44:15.360Z
2022-12-22T23:44:15.360Z
Pieter Wuille
<p>I have a question.
Does the &quot;log2_work&quot; finally is a &quot;proof de work&quot; ? :)</p>
<p>Do you know what does it mean ?</p>

<proof-of-work>
What does `log2_work` in Bitcoin Core's output mean?
Romain
# What does `log2_work` in Bitcoin Core's output mean?

(Asked by: username_0 on 2022-12-22)

I have a question.
Does the "log2\_work" finally is a "proof de work" ? :)

Do you know what does it mean ?

**Tags:** proof-of-work


---

## 1 answers

### Answer by username_1 on 2022-12-22. Score: 2

It is the 2-logarithm of the expected number of block header hash attempts were necessary the build the chain up to that point.

For example, for block *768557*, the `log2_work` is 93.909086. This means that roughly *293.909086 = 1.85973 ⨉ 1028* block hash attempts (each roughly a double-SHA256 operation) have been attempted.


---

