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

BTG probablity chart

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 probability chart

BTC block time divided by 5 to compare CDY. This pattern would be standard pattern.