Third-party verification in DOOH is a need rather than a preference today
https://digitalsignagepulse.com/news/third-party-verification-in-dooh-is-a-need-rather-than-a-preference-today/
Posterscope global president: 'Digital OOH still has work to do'
Adnews By Josh McDonnell | 1 May 2019
May 1, 2019