Digital billboards show who designed the ad.

We run a site where people design ads for LED boards and digital signs. We added a small code on each billboard, like a serial number. If you see an ad and want to know who built it, the code is there.

It's a small detail but it matters. Technicians and designers can see the code and know who did the work. It's honest. No hiding behind a generic billboard. You built this, and the code says so.