What is the offering of the Basic Attention Token?

Could you elaborate on the key offerings and functionalities of the Basic Attention Token? I'm particularly interested in understanding how it aims to revolutionize the advertising industry and reward users for their attention. What are the main benefits it promises to both publishers and advertisers? Additionally, how does it differ from traditional advertising models and how does it plan to ensure the security and privacy of its users' data? Lastly, what are the key metrics and success indicators that would determine its long-term viability and adoption?