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[–] go1dfish 0 points 1 point (+1|-0) ago 

Yes, but the cost of attack also scales with the cost of mining.

You have to control over 50% of hashing power, and that cost gets higher as more miners enter the system.

The cost of mining is not directly related to the value of the coin.

The cost of mining is related to how much hash power is mining, as price increases more hash power tends to be added though as people have more incentive to mine.

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[–] Cantilever [S] 0 points 1 point (+1|-0) ago 

I see. Thanks for explaining.

So how do you know that over 50% of hashing power isn't controlled?

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[–] go1dfish 0 points 1 point (+1|-0) ago 

You can’t know for sure, the extreme cost of doing so is a good indication that it isn’t, but not absolute proof.

but even if they did that isn’t the end of the world either, that sort of power doesn’t allow arbitrary spending of coins, it wouldn’t allow an attacker to generally take your money.

What it does allow is reorganization attacks that would allow them to say buy something from you, then revert the transaction, but this would be detectable and if it happened often it would kill the value of the network making the attacker’s investment worthless.