Any way you could add a way to audit the Dev fee being extracted when running your Awesome Miner (Vnish) antminer firmware? Also do you make any changes to the vnish firmware other than to integrate it into the software?
TYVM
You should be able to see the difficulty and number of accepted share for all pools, including the dev fee pools. Please note that the dev fee pools have a very low difficulty so the number of shares may be quite high while the actual work spend on these pools are low compared to the work spend on your defined mining pools.
You can at any point in time look at the pools and their number of accepted shares and difficulty to confirm where the hashrate is spend. As you can do this at any point in time you should be able to confirm and trust that the firmware takes the stated fee and nothing more. In case you need to verify this over time one possibility would be to do it via the API of the Antminer - where you can get the raw data, do the calculations and confirm the result.