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Key Takeaways
- Miden will launch USDCx, a stablecoin backed one-to-one by Circle’s USDC via xReserve infrastructure, hiding balances and transaction history by default.
- A selective-disclosure system lets users prove specific facts to auditors or regulators without exposing that data to the wider network.
- USDCx is set to launch alongside Miden’s mainnet debut this month, anchoring the company’s broader “PriFi” push into private institutional finance.
Miden, a zero-knowledge blockchain built around private-by-default transactions, plans to launch a native stablecoin called USDCx backed one-to-one by Circle’s USDC.
The stablecoin is designed to let users transact without exposing balances, counterparties, or transaction histories on a public ledger, while still allowing selective disclosure to regulators or auditors when needed.
How USDCx Combines Privacy and Compliance
Miden said in a press release Wednesday that USDCx will be issued natively on its network using infrastructure from Circle’s xReserve system, with the underlying USDC held in an xReserve smart contract.
Users will be able to hold and transfer USDCx without making the balances, counterparties, or transaction history of those transfers publicly visible, a departure from how most public blockchains operate.
The design does not remove accountability entirely. Miden’s selective-disclosure system lets users prove specific facts, such as an account balance or the provenance of funds, to auditors, regulators, or counterparties on a case-by-case basis, without exposing that information to the network as a whole.
Miden said the approach is meant to give institutions a way to use public blockchain infrastructure without accepting the full transparency that comes with it by default.
Built on Circle’s xReserve Infrastructure
Miden is a California-based blockchain built around what it calls client-side proving, a technical approach in which transactions are executed and cryptographically proved on a user’s own device rather than processed and exposed on the network directly.
That structure is central to how Miden delivers privacy by default while still allowing verification of transaction validity.
Circle’s xReserve infrastructure, which underpins USDCx, is designed to let USDC-backed assets move onto other blockchain networks while maintaining the one-to-one dollar backing associated with the original stablecoin.
Building on that infrastructure lets Miden offer a stablecoin tied directly to Circle’s reserves rather than relying on a separate custodial or wrapped-token structure.
Timed to Coincide With Miden’s Mainnet Launch
USDCx is expected to go live at the end of this month, timed to launch alongside Miden’s mainnet. The stablecoin’s debut coincides with the network’s own launch, rather than arriving as a later addition to an already-running chain.
The stablecoin’s arrival will be an early test of whether Miden’s privacy and selective-disclosure model works as designed once real transaction volume moves through the network, since the system has not yet operated at scale on a live mainnet.
Part of a Broader “PriFi” Push
Miden is positioning USDCx as the foundation of a wider category it calls “PriFi,” short for private finance, aimed at institutional trading, business-to-business payments, payroll, cross-border payments and corporate treasury management.
Miden said each of those use cases involves financial activity that companies and institutions have historically kept confidential, a standard the company says is difficult to reconcile with the default transparency of most existing public blockchains.
Miden spun out of Polygon as an independent project in April 2025 and is backed by investors including a16z crypto, 1kx and Hack VC. Miden has said institutional demand for on-chain finance depends on solving the privacy gap that has kept many businesses from moving sensitive financial activity onto public blockchain networks.
