{"page":"/blog/openrtb-versions-compared","modified":"2026-11-10","license":"https://creativecommons.org/licenses/by/4.0/","columns":["System","Version it speaks","Where consent and supply chain go","Source"],"rows":[["Google Authorized Buyers","OpenRTB 2.x in JSON or Protobuf; guide links the 2.6 spec","source.schain, regs.gpp, regs.gpp_sid, user.consent, plus user.ext.consent and a boolean regs.ext.gdpr; ad categories in Content Taxonomy 1.0","Google OpenRTB guide, updated 15 October 2026"],["Prebid Server (Go)","OpenRTB 2.6 internally; adapters opt in to 2.6","58 of 281 adapters declare 2.6; one declares 2.5; 222 declare nothing and receive 2.5 ext locations","bidder-info at commit 361cd6c, 30 October 2026; Prebid docs"],["Prebid.js","ORTB 2.x first-party data","TCF signals written to regs.ext.gdpr and user.ext.consent; GPP to regs.gpp and regs.gpp_sid","consentManagementTcf.ts; consentManagementGpp.ts"],["Industry survey","Mostly 2.5 or 2.6","n/d","PPC Land on IAB Spain's SSP guide, April 2026"]],"sourceUrls":[["https://developers.google.com/authorized-buyers/rtb/openrtb-guide"],["https://github.com/prebid/prebid-server/tree/361cd6c93d7e1212aa41c9584016659c50f0c13d/static/bidder-info","https://docs.prebid.org/prebid-server/developers/add-new-bidder-go.html"],["https://github.com/prebid/Prebid.js/blob/master/modules/consentManagementTcf.ts","https://github.com/prebid/Prebid.js/blob/master/modules/consentManagementGpp.ts"],["https://ppc.land/iab-spains-first-ssp-guide-exposes-the-41-working-media-problem/"]]}