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DATA is a blockchain based advertising protocol and technology stack to resolve data fraud, the most overwhelming challenge in digital advertising economy. DATA system is composed of four layers: P2P mobile metadata management layer (M3), which is a off-chain storage that was inspired by IPFS but designed specially for mobile devices based on Distributed Hash Table (DHT) and Erasure Code; Blockchain layer, which is a standalone public chain built from a fork of Ethereum on Tendermint, the Ethermint project; SDK management layer, in which AI technologies are used to generate AI models for device level reputation modeling and transfer the reputation and activity logs into M3 for peer verification; Application process layer, which consists of protocols and smart contracts to perform fraud detection. In DATA, App developers are rewarded for integrating into the system; users are rewarded for their attention contribution under proof of attention (PoA) mining rules. DATA is partnered with Yomob International Inc., a unified mobile ad global monetization platform with 120M monthly user reach and 2000+ mobile developers.