So, lets have a gander at Auroracoin Block Explorer to prove a point I made in my post right above this, about how default KGW sucks and is a coin fountain.
Lets look at the two most recent groups, of 100 blocks. With a 5 minute block target, we should average 12 blocks per hour, taking about 8 hours & 20 minutes to generate 100 blocks.
14532 2014-04-29 08:34:53 10 diff 122.244
to
14631 2014-04-29 19:26:02 4 diff 109.553
Just shy of 11 hours to generate the above 100 blocks. Over a 100 block period, I'd really hope that I'd be reasonably close to being on target time wise. 2.5 hours off is significant. But lets look at the last 100.
14632 2014-04-29 19:36:12 7 diff 109.722
to
14731 2014-04-29 23:38:07 7 diff 134.433
100 blocks in 4 hours. That is a huge swing, and what I like to call "clumping". Which what default KGW is prone to, because its looking at a huge window, and not reacting fast enough to whats going on "right now". But look at the block 14731, right before the diff hit 134.433.
14730 2014-04-29 23:29:39 2 diff 118.773
So, 99 blocks to go from a difficulty of 109 to 118, then bam. Finally it decides enough is enough. But wait... I just notice this...
14590 2014-04-29 15:34:26 22 diff 117.466
14591 2014-04-29 15:40:09 5 diff 114.095
14592 2014-04-29 18:18:58 33 diff 114.132
14593 2014-04-29 18:19:41 1 diff 71.654
With difficulty dropping, 14592 was a 2 hour and 40 minute block. 14593, difficulty dropped to 71! Here is where the coin fountain kicked in. In a matter of 5 hours and 20 minutes, 139 blocks were generated. Remarkably close to the 144 block minimum window standard KGW looks at.
14592 2014-04-29 18:18:58 33 diff 114.132
14617 2014-04-29 18:23:37 1 diff 107.076
The first 25 block of this fast period were stripped off in 5 minutes!!! 25 blocks in the period that only 1 was supposed to be generated. Crazy stuff... KGW sucks... Was this an attack, or just bad luck that prompted this crazy swing? I think you can just chock it up to KGW sucking badly in stock form with that 144 block minimum window. Yes, if you add up all the blocks over time since KGW has kicked in, you might be near your block generation target. But no matter how bad of luck you run into, 25 blocks in 5 minutes is unacceptable. Bad luck is bad luck, no one should be rewarded like that for it. Those blocks should just be lost is it was that bad. This scares me more than time warp, because it will happen under just normal operating conditions.
Those running KGW might want to take a look and my commit for BOB's Wormhole, and possibly adapt it to their own coin, if they still plan to keep it KGW. That is if no one finds its flaws are worse than stock.
BOB's Wormh0le - Kimoto Gravity Well Customization