Video Ad Serving Template (VAST) 4.2 standardizes video delivery across OTT, mobile, and web players, separating tracking verification from media file delivery.
Key Advantages of VAST 4.2 Separation
Earlier VAST versions allowed executable code (VPAID) inside video containers, creating massive security and stability vulnerabilities. VAST 4.2 mandates Universal Ad ID tracking, server-side raw media verification, and Open Measurement (OMID) viewability auditing.