Hybrid Oracle Architecture
Stork Design
Design
Hybrid Stork is architected to address the most common problems that arise from using an on-chain oracle for low-latency applications: infrequent price updates, high costs, and limited asset availability. Since putting every price update for every asset on chain is prohibitive is terms of cost and performance, we maintain a decentralized, signed network of publishers off-chain. We make their price updates available to protocols off-chain, enabling them to make the determination of which prices and how often they need to be posted on-chain. Once posted, the protocol can use their own smart contact, or Stork's contract (coming soon) to verify prices.
Components
Stork Hybrid is composed of a few components:
Decentralized Publisher Network: publishers are trusted or staked data providers that provide market data to Stork. This information is signed by the publisher in a manner compatible with the chains supported by stork. Today, oracles provide STARK and EVM compatible chains.
Stork Off-Chain High Frequency Oracle: Stork operates a redundant, geo-distributed infrastructure that powers a low-latency websocket. The websocket enables access to all price feeds provided by the publisher network, including each publisher's signature. Where applicable, Stork calculates a recommended median price that is included alongside each publisher's individual signature.
dApp Off-Chain Component: the off-chain component of the dApp integrates with the Stork websocket; the component is able to make a determination of whether a particular price update should be sent into the dApp's on-chain smart contract, for example if the price would trigger a liquidation.
dApp On Chain Contract: the smart contract uses the Stork On Chain Verifier to verify the signature of the price, ensuring only approved publisher prices are considered.
Stork On Chain Verifier: the Stork on-chain verifier can be used to verify the published prices are valid – as in, they have been signed by the appropriate contracts.
Hybrid Compared with Pure On-Chain Oracle
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