fix issue during mining #7
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The bug was caused when `timeTaken > timeExpected * 2` at first round. Originally, It would be -1, which is absolutely wrong. So in order to avoid this bug, test if `prevAdjustmentBlock.difficulty > 0`. if yes, then return prevAdjustmentBlock.difficulty - 1; if not , then return prevAdjustmentBlock.difficulty;
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The bug was caused when
timeTaken > timeExpected * 2at first round.Originally, It would be -1, which is absolutely wrong.
So in order to avoid this bug, test if
prevAdjustmentBlock.difficulty > 0.if yes, then return prevAdjustmentBlock.difficulty - 1;
if not , then return prevAdjustmentBlock.difficulty;