CDY average block time is 2 minute. Until now CDY was targeted of hash pumpping. I will show the effect of hash pumpping.
X-axis is block time. Y-axis is acumulated probality. Y-axis start from 0, end to 1. Data set is 200 block for each day.
I cut x-axis to 4minute.
At 13 Feb - no hash attack.
At 23 Apr - hash attack.
At 20 May DAA upgraded, but whale miner adapted to this program. This is acceptable
0213 and 0520 looks similar. I will compare it later. Comparing with BTC pattern 0213 and 0520, two pattern is acceptable.
extreme hash pumpping case
This is btg 22May. X-axis is divided by 5 to compare with CDY. BTG looks like hash pumpping. But BTG don't regart it hash pumpping. Now BTG block time is more unstable than CDY.
BTC block time divided by 5 to compare CDY. This pattern would be standard pattern.