At some level, the DHF is auditable now (all the data is in the blockchain and accessible via block explorers), but I guess you're suggesting that some of the frontends present the information in a clearer fashion.
Exactly what I was asking. Thank you for confirming. So it is now clear to me that the daily surplus gets added to the DHF and its size increases.
I was thinking about a display (visual) a tool perhaps, that plots an input and output to the DHF. I know the data exists... but that is simple front end will be useful for the average joe (like me) to see and understand.