bid id uniqueness

[james....@blis.com]

The spec (2.5) says "Unique ID of the bid request, provided by the exchange"

It turns out that at least one exchange will send requests with duplicate bid ids.
Unfortunately the imp.id field of the duplicate bid requests are also the same.

Is this conformant to the spirit of the OpenRTB spec?

Thanks
James

[Jim Butler]

Since bids and their IDs are sent by bidders and not exchanges, I’m not exactly sure what you mean.  Can you be specific as to which attribute you’re referring?

Thanks,

:JB

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[james....@blis.com]

I'm talking about the id of the BidRequest being sent by the SSP.

[Jim Butler]

Ah gotcha.  Yes the bid request ID is supposed to identify the auction uniquely.  The scope of uniqueness is not explicit, but the spirit is that it would at least be unique among all auctions executed by the exchange.  That said, it's fairly common practice for exchanges to use GUIDs for this field making them globally unique.

On a related note, there's the "Source.tid" attribute which is supposed to link multiple auctions for the same impression opportunity (e.g., a header bidding scenario).  This should be globally unique since those multiple auctions usually come from separate exchanges, but within the same impression opportunity, you might see the same ID which is the point (i.e., to know that these 3 auctions are really all the same impression opportunity).

Since you mentioned "Imp.id", its scope only needs to be unique within the auction itself and it's common to use ordinal numbers (i.e., 1, 2, 3,...).  This is for the case where multiple impressions are offered within the same auction so that a bid can reference which one is of interest.

:JB

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