Circle announced new privacy features for the Arc blockchain, introducing a confidential smart contract engine designed to keep sensitive financial data hidden while maintaining access to compliance and audit capabilities.
Circle said in a June 10 announcement that the new system, called Arc Privacy, addresses one of the biggest obstacles facing institutional blockchain adoption: the public visibility of transaction data and smart contract activity on most networks.
The company says this feature allows developers and businesses to selectively hide transaction details and contract status, rather than exposing all information by default.
For financial institutions, the company argued that public blockchains create challenges because payroll activities, treasury remittances, trading strategies, and customer transactions can become visible to anyone monitoring the network. Arc Privacy is designed to process transactions without exposing sensitive information on the public chain, while allowing authorized parties to review the data if necessary.
The announcement builds on Arc’s institutional blockchain strategy, introduced in May, when Circle raised $222 million through a pre-sale of ARC tokens, assigning the network a fully diluted valuation of $3 billion. Backers of this funding round include 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 required. According to Circle, companies can decide which parts of their workflows require confidentiality while keeping other features visible and interoperable with existing blockchain applications.
In the proposed architecture, sensitive transaction data remains protected during execution and authorized access can be granted for audits, compliance reviews, governance processes, and internal controls. Circle said this design eliminates the need to rely on a single party with complete visibility of personal information.
Unlike privacy systems that isolate applications from the rest of the blockchain ecosystem, Arc Privacy is developed to support composability. The company says it will enable developers 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. Blockchain uses $USDC Used as a native gas token, it introduced features such as sub-second finality, EVM compatibility, opt-in privacy, and quantum-resistant architecture.
Payroll, trading, and financing in targeted use cases
Several enterprise applications were highlighted as potential beneficiaries of the Privacy Engine.
According to Circle, organizations may be able to execute payroll payments across multiple jurisdictions without exposing compensation details, payee information, or public treasury leaks. Financial management operations can also be performed without exposing counterparties, account balances, and operating strategies to the market.
Issuers of tokenized assets can protect allocation data and holder activities, while derivatives traders can keep their positions and trading activity confidential to reduce the risk of transparency-oriented targeting. The Circle also identified lending markets as another area in which borrowers and lenders can participate without publicly disclosing collateral positions or credit activity.
Consumer payments also form another part of the proposal. Under the framework outlined by the company, users were able to conduct the following transactions: $USDC Wallet balances and payment history do not need to be publicly traceable, but records can be accessed by authorized auditors and compliance teams if needed.
According to Circle, more than 100 organizations have participated in Ark’s testnet program to date, including State Street, Deutsche Bank, BlackRock, Goldman Sachs, and Visa. The company positions privacy as a key requirement for bringing more financial activities on-chain as it prepares its network for broader institutional use.
