Agora: A Privacy-Aware Data Marketplace

We propose Agora, the first blockchain-based data marketplace that enables multiple privacy-concerned parties to get compensated for contributing and exchanging data, without relying on a trusted third party during exchange. Agora achieves data privacy , xmlns:xlink="http://www.w3.org/1999/xlink">output verifiability xmlns:xlink="http://www.w3.org/1999/xlink">atomicity of payments by leveraging cryptographic techniques, is designed as decentralized application via smart contracts. Particularly, generators provide encrypted brokers who use xmlns:xlink="http://www.w3.org/1999/xlink">functional secret key learn nothing but output specific, agreed upon, function over raw data. Data consumers can purchase decrypted outputs from brokers, accompanied corresponding xmlns:xlink="http://www.w3.org/1999/xlink">proofs correctness . implement working prototype Ethereum experimentally evaluate its performance deployment costs. As core building block we new encryption scheme with additional public parameters operate trust anchor verifying results.