TRUTH media agency created what may be the first successful deployment of an advertising campaign using blockchain smart contract technology. The blockchain technology enables advertisers to know exactly what elements of their campaign ran and when, with 100% transparency across the media supply chain. The campaign was for an undisclosed major brand using a campaign test budget. TRUTH claims to be in discussions with multiple clients across multiple sectors to launch further such campaigns. The Demand Side Platform (DSP) in the campaign was Avocet, the exchange was Sonobi and the publisher was UK based. All companies disclosed fees with the client prior to the campaign running, with TRUTH's blockchain technology validating that each partner had delivered all agreed elements.