<p>This research done at Cornell seems to suggest it is easier than expected but doesn't speak to the fact that it has or hasn't been done.</p>

<p><a href="http://arxiv.org/abs/1311.0243" rel="nofollow">http://arxiv.org/abs/1311.0243</a></p>

CC BY-SA 3.0
2013-12-23T22:31:56.370Z
2013-12-23T22:31:56.370Z
user11297
<p>I've heard discussion that if you have 51% of the network's hash power, you can effectively accept or reject any changes to the blockchain (and therefore create undeserved gain for yourself).</p>

<p>Has anyone ever accomplished this? It's theoretically possible, but has it been done?</p>

<majority-attack>
Has anyone ever gained control of the blockchain?
moench
# Has anyone ever gained control of the blockchain?

(Asked by: username_0 on 2013-12-23)

I've heard discussion that if you have 51% of the network's hash power, you can effectively accept or reject any changes to the blockchain (and therefore create undeserved gain for yourself).

Has anyone ever accomplished this? It's theoretically possible, but has it been done?

**Tags:** majority-attack


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## 1 answers

### Answer by username_1 on 2013-12-23. Score: 2

This research done at Cornell seems to suggest it is easier than expected but doesn't speak to the fact that it has or hasn't been done.

<http://arxiv.org/abs/1311.0243>


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