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schain (Supply Chain Object)
OpenRTB object that discloses every intermediary between a publisher and the winning bidder.
The schain (SupplyChain) object is appended to an OpenRTB bid request and lists every seller, reseller, and exchange that touched the impression on its way from publisher to buyer, each identified by a seller ID that must resolve in that party's sellers.json file. It exists to combat inventory arbitrage and domain spoofing by making the full path from content to auction verifiable.