SupplyChain validation vs trusting the PMP label: verifying the path you think you bought

SupplyChain validation vs trusting the PMP label: verifying the path you think you bought

A private marketplace deal feels safe by reputation. The SupplyChain object (schain) lets you check whether the path is actually as clean as the label implies — and often it is not.

1. The PMP label is a trust assertion: a named publisher, a deal ID, an implied direct relationship. Buyers treat it as verified. It is not — it is a name on a deal.

2. schain is the receipt: an ordered list of every node the impression passed through, each with a seller ID and a complete flag. A truly direct deal shows one node and complete=1.

3. The mismatch you find by checking: PMP deals routed through multiple intermediaries, schain showing two or three hops, or complete=0 meaning the chain is not even fully disclosed. You are paying premium-deal pricing for resold inventory.

4. The tradeoff in effort: trusting the label is free and sometimes wrong; validating schain per impression needs log-level data and parsing, but it is the only proof.

Why it matters: a deal ID guarantees a price, not a clean path. Parse schain node-count and the complete flag for every PMP impression in your logs. If your premium deals show multi-hop chains or incomplete disclosure, the curation you paid for did not shorten the path — it just put a respectable name in front of the same resold supply.