---
# System prepended metadata

title: Untitled

---


```mermaid
sequenceDiagram
    DSPs->>Auction: sends ad with skadn signature
    Auction->>DSPs:requests ad
    Auction->>SDK: auction_response(with with skadn signature)
    SDK->>Auction: auction_request({ data, skadversions:[...]})
    Note over SDK: On Click(CTA/EndCard)
    SDK->iOS System: opens appsheet with skadn click attribution
    iOS System--)iOS System: registers pingback

    Note over iOS System: On App Install
    iOS System->>DSPs: fires install postback(48 hrs)

    Note over SDK: On Ad View(for 3 secs or more)
    SDK->>iOS System: registers skadn view through attribution
```