Prividium on ZKsync: Technical Overview Prividium on @zksync introduces a framework for deploying private, permissioned ZKsync chains that retain full transaction and state data off-chain, while committing only cryptographic attestations to Ethereum in the form of state roots and zero knowledge proofs. This architecture is designed to address institutional constraints where confidentiality, verifiability, and regulatory compliance must coexist within a single settlement system. 1. Institutional Requirements High throughput clearing and settlement operations, such as global banking units processing approximately 10 million trades per day, rely on fragmented legacy infrastructure. These systems require extensive reconciliation across intermediaries and expose sensitive transaction data to multiple third-party service providers. The primary limitation is the absence of a unified ledger that is both cryptographically verifiable and operationally private. 2. System Architecture Prividium enables institutions to deploy a permissioned ZKsync execution environment within a private cloud or on-premises infrastructure. Transaction execution, state transitions, and business logic are processed entirely within the private environment. For each block, the system generates a cryptographic state root and a corresponding zero knowledge proof. These artifacts are published to Ethereum, while all underlying transaction data, including addresses, balances, calldata, and internal execution logic, remains confidential. Selective disclosure mechanisms allow authorized entities such as regulators or auditors to access a constrained subset of transaction fields, including counterparties, amounts, and timestamps, without exposing unrelated state or proprietary logic. 3. Compliance, Access Control, and Interoperability Compliance controls such as AML and KYC enforcement are implemented at the protocol layer through role based access permissions, rather than relying on application level enforcement. Prividium maintains native interoperability with public ZKsync networks through integrated bridging mechanisms. This design enables access to external liquidity and public settlement without introducing custodial bridges or third party trust assumptions. Asset issuance, including tokenized financial instruments such as corporate bonds, occurs within the private chain. However, issuance and state transitions remain cryptographically verifiable on Ethereum through posted proofs, aligning internal risk management requirements with external audit and reporting standards. 4. System Outcomes Empirical deployment results demonstrate a reduction in settlement latency of approximately 40 percent relative to legacy messaging based systems. The architecture provides full auditability through cryptographic verification while preserving confidentiality of proprietary transaction data. Institutions are able to participate directly in the broader ZKsync and Ethereum ecosystems while maintaining strict control over ledger visibility and internal policy enforcement. 5. Architectural Implications Prividium reframes blockchain from an externally operated transaction platform into an internally managed financial infrastructure, combining private execution with public verifiability at the protocol level.