{"page":"/blog/how-real-time-bidding-works","modified":"2026-11-10","license":"https://creativecommons.org/licenses/by/4.0/","columns":["Signal","Field","What it tells the buyer"],"rows":[["Children's privacy (US)","regs.coppa","1 means the request falls under the US Children's Online Privacy Protection rules"],["GDPR applies","regs.gdpr","1 means GDPR applies, 0 means it does not, missing means unknown; a standard field since OpenRTB 2.6"],["EU consent choices","user.consent","The Transparency and Consent Framework (TCF) string from the site's consent tool"],["US and other privacy laws","regs.gpp, regs.gpp_sid","The Global Privacy Platform (GPP) string and the sections that apply; added in 2.6-202211"],["Legacy US string","regs.us_privacy","The older US Privacy String, being replaced by GPP"],["Identity","user.eids","Extended identifiers such as UID2, sent only where allowed"]],"sourceUrls":[[],[],[],[],[],[]]}