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I'm open to some feedback on a fun little perk on doubling someone's hash, but unless it's for a 5nd period, it will never get the full benefits.
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If you mine for 10 hours at 4 TH/s you expect to get rewarded 10 hours at 4 TH/s
The 5Nd is only how the reward comes to you to reduce variance ...
which is from when you start until 5Nd after you stop i.e. start + 10hrs + 5Nd