KGW, Digishield: does it really prevent instamine?

[dE_logics]

KWG is characterized by smooth difficulty increase on rapid increase in network hashrate, which helps intaminers as compared to sudden difficulty retargets of a simple algo.

Cause the difficulty increase slowly, the intaminer will take advantage by quickly generating blocks and stop mining once the difficulty is high enough.

But when the instaminer is gone, the high difficulty is left for regular miners to take care off, and the block chain speed slows to a crawl. What makes matters worst is that the difficulty goes down slowly over time instead of suddenly going down like we have with regular algorithms. It takes the same amount of time to recover from the high difficulty set by the instaminer.

So as compared to simple algorithms which re-target every block, KGW has a disadvantage -- the regular algo will increase the difficulty suddenly preventing an instamine, KGW does it slowly helping in the instamine.

KGW has only one minor advantage -- it'll prevent the blockchain from halting for a longer period of time, but will not prevent the instamine.

Digishield is worst -- it helps the instaminer further by slowly increasing the difficulty, while the difficulty goes up, the total no. of blocks mined is over the target. But Digishield brings the difficulty down aggressively which again means more blocks mined per unit time as compared to the target block interval. So basically that means in these situations the target block interval will be horribly off target and there will be over inflation.