Basic Attention Token (BAT) is a token powering a decentralized, transparent, blockchain-based digital ad exchange platform built on the Ethereum Blockchain. BAT tokens are exchanged between users, publishers, and advertisers on this platform, creating a transparent and efficient Blockchain-based digital advertising market. This platform is accessed through the Brave browser, an open-source, privacy-focused browser built on Google’s Chromium that prevents user tracking and blocks ads and malware on the user’s computer. The Brave browser utilises a decentralised ledger that anonymously and privately monitors the amount of “user attention”; the time users spend on different websites and looking at advertisements. Users are rewarded in BAT for their attention, and publishers are rewarded in BAT for the attention they receive. Users can choose which ads they want to see, and advertisers can deliver highly targeted ads to users to maximize engagement and reduce abuse and fraudulent ad reporting.