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European Blockchain Week 2021 22.09.2021 Alessandro Brighente, M. Conti, G. Kumar, R. Saha

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DART A. Brighente, M. Conti, G. Kumar, R. Saha

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| ONTOCHAIN.NGI.EU Introduction and Motivation • Off-chain knowledge management represents a fundamental task for a widely applied blockchain ecosystem • Distributed Oracles Network (DON) provide a solution • However, data shall come with a reliability value • DART provides a modular solution for reliability-aware off-chain knowledge reporting

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| ONTOCHAIN.NGI.EU DART Architecture

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| ONTOCHAIN.NGI.EU Architecture Details

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| ONTOCHAIN.NGI.EU Truth Discovery • Assess the veracity of the collected information • Independent from type of data • Exploit space and time correlation • Multiple truth discovery levels to prevent attacks

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| ONTOCHAIN.NGI.EU DON under attack • Collusion: multiple reporters agree on a false value • Majority Voting: most reported value is the true one • TD provides higher resistance towards attacks

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| ONTOCHAIN.NGI.EU Next Steps • Implementation of a testbed to validate our truth discovery framework • Investigate scalability/reliability tradeoff • Privacy guarantees

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Thank you! [email protected] https://www.math.unipd.it/~abrighen/ Q&As