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The Basic Attention Token (BAT) was developed to address this. BAT, an ERC20 token built on top of Ethereum, will be the token of utility in a new, decentralized, open source and efficient blockchain-based digital advertising platform. In the ecosystem, advertisers will give publishers BATs based on the measured attention of users. Users will also receive some BATs for participating. They can donate them back to publishers or use them on the platform. This transparent system keeps user data private while delivering fewer but more relevant ads. Publishers experience less fraud while increasing their percentage of rewards. And advertisers get better reporting and performance.