&gt;The only special power of a 50% miner is to consistently resolve double-spend attempts in its favor.<p>No, this post, and the handy table inside, explains the various attacks possible at different percentages of the hash rate:<p><a href="http:&#x2F;&#x2F;hackingdistributed.com&#x2F;2014&#x2F;06&#x2F;16&#x2F;how-a-mining-monopoly-can-attack-bitcoin&#x2F;" rel="nofollow">http:&#x2F;&#x2F;hackingdistributed.com&#x2F;2014&#x2F;06&#x2F;16&#x2F;how-a-mining-monopo...</a>