Use these specifications to prepare ads that upload smoothly into HUB and deliver correctly across the Blockchain-Ads network. Assets that do not meet these requirements may be rejected or under-deliver.
1. Display Ads
A. Static & Animated Banners
- Accepted formats: JPG, PNG, GIF
- Max file size: 2 MB
- GIF duration: 6–15 seconds; looping allowed (no aggressive flashing)
Standard display sizes:
- 300×250
- 300×600
- 728×90
- 160×600
- 320×50
- 320×100
- 970×90
- 970×250
Non-standard / high-impact formats:
- Offerwall: 300×250, 300×300, 600×300 (max 500 KB)
- Push-down / push-up: 728×90 expanding to 728×300 (max 1.5 MB)
- Pop-up / pop-under: 500×500 to 800×600 (max 1 MB)
Tip: For best performance, keep designs clear, mobile-friendly, and focused on a single message and call-to-action.
2. Video Ads
- Format: MP4 (H.264 codec)
- Length: 6–30 seconds
- Supported aspect ratios: 16:9, 1:1, 4:5, 9:16
- Max file size: 30 MB
Best practice: Front-load the hook and brand in the first 3 seconds and always include a clear call-to-action.
3. Native Ads
Each native ad is composed of text plus an image that adapts to the publisher’s layout.
- Title: up to 60 characters
- Description: up to 120 characters
- Image:
- Minimum: 600×600
- Recommended: 1200×800
- Formats: JPG or PNG
- Max file size: 1 MB
Use concise, benefit-led copy and imagery that matches the landing page and publisher context.
4. HTML5 Ads
- Package: ZIP file containing HTML/CSS/JS
- Max file size: 2 MB
- Allowed: Inline or bundled JS only (no external JS libraries)
- All assets must load over HTTPS
- Supported sizes: 300×250, 300×600, 728×90, 160×600, 320×50, 320×100
Ensure creatives render correctly without user interaction and avoid heavy animations that hurt load time.
5. General Creative Policies
To protect users and support compliance (especially for finance, blockchain, and other regulated industries), all creatives must follow these rules:
- No misleading, exaggerated, or unverifiable claims
- No excessive flashing or strobing (max ~3 flashes per second)
- Landing page must load in under 3 seconds on a standard connection
- Ads and landing pages must respect GEO-specific regulations and disclosures
- Content must be appropriate for brand-safe inventory and aligned with the advertised product
Advertisers running campaigns in regulated verticals should also ensure legal disclaimers and required risk warnings are clearly visible on the landing page (and, where relevant, within the ad).
