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Blockchain based systems allow various kinds of financial transactions to beexecuted in a decentralized manner. However, these systems often rely on atrusted third party (oracle) to get correct information about the real-worldevents, which trigger the financial transactions. In this paper, we identifytwo biggest challenges in building decentralized, trustless and transparentoracles. The first challenge is acquiring correct information about thereal-world events without relying on a trusted information provider. We showhow a peer-consistency incentive mechanism can be used to acquire truthfulinformation from an untrusted and self-interested crowd, even when the crowdhas outside incentives to provide wrong information. The second is a systemdesign and implementation challenge. For the first time, we show how toimplement a trustless and transparent oracle in Ethereum. We discuss variousnon-trivial issues that arise in implementing peer-consistency mechanisms inEthereum, suggest several optimizations to reduce gas cost and provideempirical analysis.

Infochain: A Decentralized, Trustless and Transparent Oracle on Blockchain