What is this item, CDD?
I don't know, I just used Blockchair's names.
I Just discovered
cdd_total float The number of destroyed coindays
https://blockchair.com/api/docs#link_001Cdd is a measure of bitcoin transaction volume.
Bitcoin days destroyed for any given transaction is calculated by taking the number of Bitcoins in a transaction and multiplying it by the number of days it has been since those coins were last spent.
https://en.bitcoin.it/wiki/Bitcoin_Days_Destroyed