Herodotus Data Processor (HDP)

A ZK coprocessor for smart contracts. Run custom Cairo programs over historical and cross-chain on-chain data, and verify results on-chain via STARK proofs.

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HDP

HDP - The ZK Coprocessor for Cross-Chain and Historical Data

Run provable compute over authenticated onchain data.The Herodotus Data Processor (HDP) is a ZK Coprocessor for executing user-defined logic over historical and cross-chain blockchain state. It lets developers compute over data that would be too expensive or unavailable for a smart contract to process directly, then make the result available onchain with cryptographic guarantees.

HDP uses Storage Proofs as authenticated inputs and STARK proofs to verify computation, reducing oracle trust while keeping heavy execution offchain.Use HDP to build verifiable TWAPs, voting strategies, risk checks, compliance predicates, cross-chain analytics, and other data-rich smart contract workflows.Put simply: HDP lets smart contracts consume the result of provable compute over historical or cross-chain state.