## chainlink 

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### tl; dr

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* a decentralized oracle network consisting of three key smart contracts:
  * a reputation contract: keep track of data providers' performance.
  * an order-matching contract: selects bids from oracles using the reputation contract.
  * an aggregation contract—and an off-chain registry of data providers.
* one of the main challenges with such a decentralized approach is the formulation of the aggregation function. 
* chainlink proposes calculating a weighted response, allowing a validity score to be reported for each oracle response. 

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### resources

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* [fair sequencing services](https://blog.chain.link/chainlink-fair-sequencing-services-enabling-a-provably-fair-defi-ecosystem/)