Zksync is the Ethereum-secured network for connected ZK chains

Zksync is a zero-knowledge network that connects public and private Ethereum-based chains with cryptographic proofs, native interoperability, and privacy tools for regulated digital asset activity. It is built around the ZK Stack, Prividium for enterprise use, and fast proof generation through Airbender, so institutions, developers, and asset issuers can launch custom chains while staying linked to Ethereum security and shared liquidity.

The Bank Stack of Ethereum, in plain terms

The phrase "Bank Stack of Ethereum" describes a full infrastructure layer for financial applications rather than a single consumer wallet or exchange. It combines customizable chains, zero-knowledge proof systems, privacy-preserving settlement, and tools for compliance workflows. That matters because banks, fintech companies, fund platforms, payment providers, and real-world asset issuers need more than cheap transfers. They need control over data, user access, policy enforcement, performance, and auditability.

Zksync approaches that requirement by making each chain configurable while keeping it connected to a broader network. A public chain serves open DeFi and consumer applications. A private chain serves use cases that require user-level privacy, restricted access, selective disclosure, or enterprise operations. Both can belong to the same cryptographically secured environment, which is the important distinction: the architecture is designed to link private execution with public liquidity and Ethereum finality.

How ZK proofs secure the network

Zero-knowledge proofs let a system prove that transactions were executed correctly without requiring every outside party to reprocess every private detail. In this model, a chain executes activity, generates a proof of correctness, and posts verifiable evidence to Ethereum. Ethereum then acts as the settlement and security anchor, while the chain itself delivers lower costs, faster execution, and application-specific rules.

That said, Zksync uses this model to reduce reliance on separate validator assumptions. The official positioning is direct: the network is secured by cryptography, not by a new validator set. That does not mean every operational risk disappears. Sequencer design, bridge implementation, wallet behavior, and smart contract code still matter. The core security claim is narrower and stronger: validity proofs enforce correct state transitions, and Ethereum settlement provides the base layer that applications ultimately rely on.

Prividium and private asset settlement

Prividium is the enterprise privacy layer aimed at regulated finance. It supports private chains where institutions issue, transfer, and settle assets without exposing sensitive user information to the public internet. The same design still allows cryptographic proof, policy checks, and controlled disclosure, which is why it fits use cases such as tokenized deposits, treasuries, private credit, fund shares, and institutional stablecoin infrastructure.

A useful way to understand it is to separate transaction correctness from transaction visibility. A bank or asset manager needs proof that an operation followed the rules, but it also needs to protect personally identifiable information, investor records, and business-sensitive order flow. Selective disclosure lets a participant reveal the required fact to the required party without publishing the entire underlying dataset. That is the practical bridge between public-chain auditability and private financial operations.

ZK Stack for launching custom chains

The ZK Stack is the open-source framework for building customizable ZK chains that inherit Ethereum security. Developers use it to define their own execution environment, fee policy, data choices, permissions, and user experience while retaining compatibility with Ethereum-style tooling. Because the chains are EVM-based, teams working with Solidity, smart contract audits, account abstraction patterns, and familiar developer stacks do not start from an unfamiliar runtime.

More broadly, Zksync turns that framework into a network strategy. A company can launch a chain with its own economics, observability, and operating model while remaining connected to other chains in the same ecosystem. That is especially relevant for businesses that want branded infrastructure, predictable performance, and controlled onboarding without isolating their users from broader liquidity.

Where public and private chains meet

The strongest use cases appear where a private workflow needs a public settlement benefit. A tokenized treasury product needs controlled investor onboarding, but its value improves when it connects to collateral, liquidity, reporting, and settlement rails. A payments network needs fast transfers across regions, but it also needs reconciliation, authorization, and clear proof that each movement followed the correct rules.

This is where Zksync's public-private architecture becomes more than a scaling story. Private order flow can execute without broadcasting sensitive information, then publish proof that execution was correct. Collateral can move across systems atomically, reducing the manual breaks that appear when ledgers, custodians, and payment networks each maintain separate states. Public price integrity and private execution can coexist when the chain design separates what must be proven from what must remain confidential.

Fees, finality, and transaction flow

Users interact with a ZK chain through a wallet, a smart contract, or an application interface. A transaction is submitted to the chain, included by the sequencer, executed in the chain environment, and later represented in a validity proof. The proof is posted to Ethereum so the resulting state receives Ethereum-backed finality. The official materials describe fast network hops and minutes-to-Ethereum finality, which fits payments, settlement, and cross-chain application flows that cannot wait for slow back-office reconciliation.

Costs come from execution, data publication, proving, and chain operations. On public chains, the user sees a network fee inside the wallet or application. On enterprise chains, the operator can design a different fee experience, including gasless participation for approved users. That flexibility matters for institutional onboarding because a client buying a tokenized fund share should not need to manage every technical detail of gas before completing an approved transaction.

Getting started as a user or builder

A regular user starts by choosing a wallet that supports the chain or application they want to use, funding it with the required asset, and checking the transaction details before signing. ETH is commonly used for gas on Ethereum-aligned networks, while specific applications also use stablecoins, tokenized assets, or governance tokens. The right first step is driven by the application, not by the brand name alone.

Builders follow a different path. They decide whether they need a smart contract on an existing public chain, a dedicated public chain, or a private chain with permissioning and compliance controls. A team planning payments, tokenized deposits, private credit, or regulated asset issuance should map requirements before deployment:

• Who is allowed to access the application or chain.
• Which transaction details stay private and which details are disclosed.
• What assets settle onchain, such as stablecoins, fund shares, or treasuries.
• How finality, recovery, monitoring, and audit workflows operate.
• Which wallet, custody, or passkey flow users will actually complete.

Day to day, Zksync gives those teams a chain-building route, but the product design still determines whether onboarding feels simple, whether compliance logic is enforceable, and whether users understand the asset they are holding.

Real examples in banking and institutional assets

The ecosystem's case studies show its intended direction. BitGo has been highlighted around tokenized deposit adoption, Cari Network around tokenized deposits in the United States banking system, and ADI Chain around institutional Layer 2 infrastructure for stablecoins and real-world assets in the MENA region. These examples point toward bank-grade settlement, private asset issuance, and programmable money rather than only retail trading.

That institutional focus does not replace open crypto use. It expands the design space. A public DeFi market needs composability and liquidity. A regulated asset platform needs identity, permissions, reporting, and privacy. Zksync's thesis is that both environments belong in one Ethereum-secured network, with proofs acting as the common language between them.

Risks users should understand before signing

Any chain-based system concentrates risk in the details that users touch: bridges, wallets, approvals, application contracts, and asset issuers. Validity proofs protect the correctness of chain state, but they do not turn every token or application into a good product. A stablecoin still depends on its issuer, a tokenized fund still depends on its legal and operational structure, and a wallet signature still authorizes whatever the transaction describes.

The most useful caution is specific: read the transaction request before signing, especially when approving token spending or bridging assets between chains. Enterprise users should also examine custody design, access controls, incident response, monitoring, and proof verification before moving production value. Strong cryptography is one layer of the system; operational discipline decides how well that layer survives real use.

Alternatives in the Ethereum scaling landscape

Importantly, Zksync operates alongside other Ethereum scaling systems, each with a different emphasis. Arbitrum and Optimism are optimistic rollup ecosystems with large DeFi footprints and mature developer activity. Polygon's zkEVM work focuses on zero-knowledge Ethereum compatibility across Polygon infrastructure. Starknet uses STARK proofs and the Cairo language, which gives it a distinct developer model and proof architecture.

The comparison is not only about transaction fees. A team choosing infrastructure looks at privacy needs, proof design, developer language, liquidity, finality expectations, chain customization, and enterprise support. This network stands out when the requirement is a customizable ZK chain that links public and private finance under Ethereum settlement, particularly when Prividium-style privacy and policy controls are part of the product plan.