Circle unveils Arc Privacy to bring confidential smart contracts to institutions

Circle has unveiled new privacy capabilities for its Arc blockchain, introducing a confidential smart contract engine designed to keep sensitive financial data hidden while preserving access for compliance and audit functions.

In a June 10 announcement, Circle said the new system, called Arc Privacy, addresses one of the biggest obstacles facing institutional blockchain adoption, namely the public visibility of transaction data and smart contract activity on most networks. 

According to the company, the feature will allow developers and businesses to selectively conceal transaction details and contract states instead of exposing all information by default.

For financial institutions, the company argued, public blockchains create challenges because payroll activity, treasury transfers, trading strategies, and customer transactions can become visible to anyone monitoring the network. Arc Privacy has been designed to process transactions without exposing sensitive information on the public chain while still allowing authorized parties to review data when required.

The announcement builds on Arc’s institutional blockchain strategy introduced in May, when Circle raised $222 million through a presale of the ARC token and assigned the network a fully diluted valuation of $3 billion. Backers of the fundraising round included Andreessen Horowitz, BlackRock, Apollo Funds, ARK Invest, Haun Ventures, Intercontinental Exchange, and Standard Chartered Ventures.

Arc expands privacy tools for institutional finance

Within the Arc ecosystem, privacy remains optional rather than mandatory. According to Circle, businesses can decide which parts of a workflow require confidentiality while leaving other functions visible and interoperable with existing blockchain applications.

Under the proposed architecture, sensitive transaction data remains protected during execution while authorized access can be granted for audits, compliance reviews, governance processes, and internal controls. Circle said the design removes the need to rely on a single party with full visibility over private information.

Unlike privacy systems that isolate applications from the rest of the blockchain ecosystem, Arc Privacy is being developed to support composability. According to the company, developers will be able to combine private smart contracts into larger application flows and reuse existing contract logic across multiple products.

Arc itself was launched as a public blockchain focused on institutional finance. The blockchain uses USDC as its native gas token and was introduced with features including sub-second finality, EVM compatibility, opt-in privacy, and quantum-resistant architecture.

Payroll, trading and lending among target use cases

Several enterprise-focused applications were highlighted as potential beneficiaries of the privacy engine.

According to Circle, organizations could execute payroll payments across multiple jurisdictions without publicly revealing compensation details, recipient information, or treasury outflows. Treasury management operations could also be conducted without exposing counterparties, account balances, or operational strategies to the market.

Tokenized asset issuers would be able to protect allocation data and holder activity, while derivatives traders could keep positions and trading activity confidential to reduce the risk of transparency-driven targeting. Circle also identified lending markets as another area where borrowers and lenders could participate without publicly exposing collateral positions or credit activity.

Consumer payments form another part of the proposal. Under the framework outlined by the company, users could transact with USDC without making wallet balances and payment histories publicly traceable, while approved auditors and compliance teams would still be able to access records when necessary.

More than 100 organizations, including State Street, Deutsche Bank, BlackRock, Goldman Sachs, and Visa, have previously participated in Arc’s testnet program, according to Circle. The company has positioned privacy as a key requirement for bringing more financial activity onchain as it prepares the network for broader institutional use.