DeepThought: A Reputation and Voting-Based Blockchain Oracle

Thanks to built-in immutability and persistence, the blockchain is often seen as a promising technology to certify information. However, when the information does not originate from the blockchain itself, its correctness cannot be taken for granted. To address this limitation, blockchain oracles services that validate external information before storing it in a blockchain were introduced. In particular, when the validation cannot be automated, oracles rely on humans that collaboratively cross-check external information. In this paper, we present Deep Thought, a distributed human-based oracle that combines voting and reputation schemes. An empirical evaluation compares Deep Thought with a state-of-the-art solution and shows that our approach achieves greater resistance to voters corruptions in different configurations.