[[Proof Pods in the Data Marketplace|Proof Pods]] serve as dedicated off-chain entities coordinated through off-chain workers that generate [[ZKP/ZKP Base Layer/Core Concepts/Zero-Knowledge Proofs|zero-knowledge proofs]] for marketplace operations such as access [[ZKP/Data Marketplace/Tokenized Datasets/Tiered Access Control|control verification]], [[ZKP/Data Marketplace/Tokenized Datasets/Encryption and ZKP Ownership Verification|dataset attribute validation]], and [[ZKP/Data Marketplace/Decentralized Governance/Decentralized Governance via Data DAOs|governance participation.]] When a user requests access to a dataset, a Proof Pod generates the necessary proof using circuits like AccessVerifier, enabling verification of eligibility without exposing sensitive details. The proof generation process occurs off-chain to minimize blockchain computational demands, with verification performed on-chain using EVM pallet precompiles and native verification pallets for [[ZKP/Data Marketplace/Technical Basis/Cryptographic Foundations/Elliptic Curve Pairings|elliptic curve operations]]. This separation of concerns aligns with the base layer's architecture, where ZKP verification costs 200,000 gas equivalent weight as specified in the technical parameters [82]. For each [[ZKP/Data Marketplace/Intro|marketplace]] operation requiring privacy preservation, the corresponding [[ZKP/ZKP Base Layer/ZKP Blockchain/Technical Build Application Layer/Privacy-Preserving Computations with ZK Wrappers/Circuit Definition for Diverse AI Tasks/Circuit Definitions|ZKP circuit]] defines the computational logic to be verified. For instance, the AccessVerifier circuit validates that a user meets tier requirements without revealing their token balance, while DatasetAttributeVerifier confirms statistical properties without exposing raw data. Proof Pods execute these circuits with the appropriate inputs, generating cryptographic proofs that can be efficiently verified on-chain through the verification infrastructure. ![[Off-Chain Proof Generation vs On-Chain Proof Verification.png]] See also: [[ZKP/Data Marketplace/Generation of ZK Proofs/Specialized Hardware Implementation|Specialized Hardware Implementation]]