The SupplyChain Object standard is the pinnacle of the IAB Tech Lab’s suite of Supply Chain Transparency standards. It enables (app-)ads.txt protections and sellers.json seller transparency to be extended to the whole supply chain by exposing all the seller accounts a bid request has passed through on the way to the buyer. SupplyChain Objects (schains) can be used to detect unauthorized domain and app spoofing wherever it occurs in the supply chain, attribute fraud schemes to specific actors, and optimize supply paths.