CoinDesk
Miden is rolling out USDCx, a privacy-focused stablecoin backed 1:1 by USDC through Circle's xReserve infrastructure, alongside its zero-knowledge mainnet at the end of this month. The token lets users hold and transfer value without exposing balances, counterparties or transaction histories onchain, while a selective-disclosure layer lets holders prove any of those facts to auditors, regulators or counterparties when needed. Miden, a ZK blockchain built around client-side proving where transactions execute and prove on the user's device, spun out of Polygon in April 2025 and is backed by a16z crypto, 1kx and Hack VC.
Why it matters
Privacy has emerged as one of the key barriers to moving more financial activity onchain. Public blockchains expose transaction histories, balances and counterparties by default, a level of transparency that is difficult to reconcile with how businesses and financial institutions actually operate. Trading firms don't want to reveal positions, companies can't publish payroll and treasury activity on a block explorer, and individuals may not want their financial lives visible at all. USDCx's design tries to thread that needle: confidential by default, provable on demand, preserving crypto's programmability without sacrificing the confidentiality of traditional finance.
Market impact
USDCx debuts into a stablecoin sector already dominated by Circle's USDC, which means the launch is less about competing on supply and more about extending USDC into use cases the public version can't serve. Miden is positioning USDCx as the foundation of a broader category it calls "PriFi," spanning private institutional trading, B2B payments, payroll, cross-border payments and corporate treasury management. The question now is whether the selective-disclosure design clears regulatory muster: if it does, USDCx has a credible institutional path; if not, it stays a privacy-coin niche.
Frequently asked questions
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What is USDCx and how does it differ from USDC?
USDCx is Miden's privacy-focused stablecoin backed 1:1 by Circle's USDC through the xReserve infrastructure. While USDC transactions are publicly visible onchain, USDCx hides balances, counterparties and transaction histories by default while letting users selectively prove them to auditors.
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When does USDCx launch?
USDCx is expected to go live at the end of this month, alongside the debut of the Miden zero-knowledge mainnet.
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How does Miden deliver privacy while staying compliant?
Miden is a zero-knowledge blockchain built on client-side proving, where transactions execute and prove on the user's device rather than the network. A selective-disclosure layer lets users prove balances, provenance or other details to auditors, regulators or counterparties when needed.
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Who is backing Miden?
Miden spun out of Polygon in April 2025 and is backed by a16z crypto, 1kx, Hack VC and others.
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What use cases is USDCx targeting?
Miden is positioning USDCx for payments, trading, payroll, cross-border payments and corporate treasury, framing the broader category as 'PriFi' for private institutional finance.
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