News for hackers. Stuff that matters.
Re:Bitcoin's mining difficulty has increased by 41.9% over t... by emin-gun-sirer on Tuesday December 22, 2015 @10:09AM (#10778122)
>The only special power of a 50% miner is to consistently resolve double-spend attempts in its favor.

No, this post, and the handy table inside, explains the various attacks possible at different percentages of the hash rate:

http://hackingdistributed.com/2014/06/16/how-a-mining-monopo...

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