<p>You are speaking of 51% attack or Majority Attack</p>

<p>You can read more about it <a href="https://en.bitcoin.it/wiki/Majority_attack" rel="nofollow noreferrer">in here</a></p>

<p>If they join, yes they can double spend or so.</p>

<p>But they can't change the price though, as that purely depends on the market demand.</p>

<p>Till now, there has been no Majority Attack on BTC, though it has been demonstrated on small altcoins.</p>

CC BY-SA 3.0
2017-09-18T16:48:06.007Z
They can control in way that they can hoard bitcoin and dont sell which will raise the demand and hence price. Since they would own the most bitcoins they can control demand right ?
Abhishek
CC BY-SA 3.0
2017-09-18T16:57:11.347Z
If this happens, then people will lose trust in BTC. And if trust is lost, then the value will be lost. So, even if they hoard, if no one is there to buy, then artificial demand won't raise the price.
remedcu
CC BY-SA 3.0
2017-09-17T14:57:03.750Z
2017-09-17T14:57:03.750Z
remedcu
<ol>
<li>If they want spent twice, it will cost a lot of power to do so, so the tx must has huge amounts which be worth to do it. But when you create a transaction with huge amounts, you just wait for more confirmations.</li>
<li>But going short the bitcoin market, it would be a tempting reason.</li>
</ol>

CC BY-SA 3.0
2017-09-18T02:08:49.023Z
2017-09-18T02:08:49.023Z
jinsong ai
<p>It just strikes to me that if top 2 bitcoin miners which would own more than 50% mining, merges can they control bitcoin.</p>

<p>In hypothetical scenario if have bad intension can they control the price etx of bitcoin ?</p>

<bitcoin-core>
Is it a threat if top mining player merges?
Abhishek
# Is it a threat if top mining player merges?

(Asked by: username_0 on 2017-09-17)

It just strikes to me that if top 2 bitcoin miners which would own more than 50% mining, merges can they control bitcoin.

In hypothetical scenario if have bad intension can they control the price etx of bitcoin ?

**Tags:** bitcoin-core


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## 2 answers

### Answer by username_1 on 2017-09-17. Score: 1

You are speaking of 51% attack or Majority Attack

You can read more about it [in here](https://en.bitcoin.it/wiki/Majority_attack)

If they join, yes they can double spend or so.

But they can't change the price though, as that purely depends on the market demand.

Till now, there has been no Majority Attack on BTC, though it has been demonstrated on small altcoins.

> **Comments:**
> **username_0**: They can control in way that they can hoard bitcoin and dont sell which will raise the demand and hence price. Since they would own the most bitcoins they can control demand right ?  
> **username_1**: If this happens, then people will lose trust in BTC. And if trust is lost, then the value will be lost. So, even if they hoard, if no one is there to buy, then artificial demand won't raise the price.  

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### Answer by username_2 on 2017-09-18. Score: 0

1. If they want spent twice, it will cost a lot of power to do so, so the tx must has huge amounts which be worth to do it. But when you create a transaction with huge amounts, you just wait for more confirmations.
2. But going short the bitcoin market, it would be a tempting reason.


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