Kimoto’s Gravity Well is a common method for difficulty readjustment in cryptocurrency mining. It was first implemented by Megacoin and named after that coin’s lead developer. It was designed to solve problems caused by multipool mining.

Multipools are mining collectives which automatically switch to mining whichever cryptocurrency is the most profitable. The problem with this is that when a multipool targets a coin the increase in hashing power makes the difficulty soar, which in turn makes profitability of mining crash. The multipool then moves on to the next target and the network is left struggling to find miners to keep maintaining the network with the new high rate of difficult. Kimoto’s Gravity Well algorithm allows difficulty to be readjusted every block, meaning that it can respond to both increases and decreases in hashing power immediately and keep the difficulty level at an appropriate level.

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