Playbook: roll out ads.cert authentication on your supply

Playbook: roll out ads.cert authentication on your supply
Watching: signed bid requests are becoming a buyer filter; unsigned supply gets quietly deprioritized.

— Generate your ads.cert key pair and publish the public key path
— Declare it in your ads.txt via the manager record
— Coordinate with each SSP on which fields they'll sign
— Test signature verification on a sample request before going live
— Rotate keys on a schedule and update the published path same-day

Impact: unsigned supply increasingly reads as lower-trust to sophisticated buyers. rumor