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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.

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[–] Cantilever [S] ago 

Unless the attackers motive is to destroy the currency at its peak in order to wipe out a huge amount of wealth and crush the spirit of everyone who believed in it