Ensuring Real-Time Bidding compliance with GDPR and the ePrivacy Directive remains challenging. Existing solutions, like the IAB’s Transparency and Consent Framework and OpenRTB, lack transparency and fail to secure legally valid user consent. We propose a blockchain-based framework that decentralizes consent management, giving users direct control. The system automates consent handling, provides immutable compliance proof, and includes a smartphone app for users to manage consent per website. Additionally, we introduce a specificity value for IAB Audience Taxonomy elements, helping users assess the privacy impact of sharing data. By enhancing autonomy, transparency, and accountability, our approach strengthens trust in programmatic advertising while maintaining GDPR compliance without disrupting the industry.