```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
```