Yesterday, I noticed an abnormal/unexpected drop in the per epoch block rewards, which I and our xSPO community cannot explain.
I checked the block rewards of multiple pools including my own from epoch 292 until 299 and this is what I found in terms of block rewards:
To get the block rewards, I summed the delegators and operator rewards and divided that by the number of blocks minted in epoch. My source of data was adapools and cardanoscan.
As you can see, and as is expected, the block rewards should gradually decrease over time as a fixed percentage of the reserves is used to payout the rewards and these reserves deplete over time (decreasing rate of inflation). More information about this mechanism is to be found in this post
But as you can see in the image above, there was a 3,8% drop in 1 epoch, which normally would take many epochs.
With the xSPO community, we analyzed possible reasons for the drop and figured out that the drop is caused by a reduction of the reserves of Cardano.
see here: Pots | Cardano Staking
Reserves in 298: 11.68B ₳
Reserves in 299: 11.34B ₳ (3% lower than 298)
So something drastically reduced the Reserves.
There was no unexpected high number of blocks or any temporarily increased rewards. The above adapools link shows an untypical high number of rewards in Epoch 299 with 856.97M ₳ instead of the typical ~550M. But this number seems to be unrealistic in any case as the expected rewards per Epoch are ~30M
So the key question here is: What reduced the Reserves by ~340M ADA?
Is this maybe cause by the dbsync rewards bug which affects the values shown by adapools/cardanoscan?
Is there a way to see transactions that are going out of the Reserve? Not sure if this relates to a publicly visible address?
There were 4 new private pools in this same epoch; all with 64M ada