Are the publishers I'm buying from verified, transparent and brand safe?
You can always check any publishers traffic quality according to the ads.txt downloading a Report from the platform. By selecting the drill-down ads.txt Publisher, these are the different options that the variable will return regarding the traffic quality:
Unknown: Can't read the ads.txt (or app-ads.txt).
Mismatch: We have access to the publishers ads.txt but the publisher ID is not found.
All: Indirect relationship between the publisher and the SSP (it works as an intermediary/reseller).
Direct: Direct relationship between the Publisher and the SSP (NOT verified by their sellers.json).
Verified: Direct relationship between the Publisher and the SSP (verified by their sellers.json).