Citrea has acquired Crest, a developer of a self-custodial private Bitcoin wallet, as it prepares to bring zero-knowledge privacy features to its Bitcoin application layer. The companies said Crest’s wallet is expected to launch in the coming weeks with automatic shielding and private BTC transfers, seeking to make private mobile Bitcoin payments available without requiring users to surrender control of their funds.
The deal, announced Sept. 24 by Citrea, brings Crest founder Meliksah Gurtemel into Citrea as product lead. Terms of the acquisition were not disclosed.
Citrea said Crest is being built on its Bitcoin-secured execution environment, an application-layer system designed to support financial applications while remaining tied to Bitcoin’s security model. The acquisition places privacy technology alongside Citrea’s stated aim of expanding access to Bitcoin capital markets for both institutions and individual users.
Bitcoin’s public ledger has long created a practical tension for users who want the asset’s settlement assurances without making their transaction history easily traceable. Addresses are pseudonymous rather than automatically linked to real-world identities, but balances, transfers, and counterparties can often be analyzed through blockchain-tracing tools. Citrea’s plan is to use zero-knowledge privacy pools to obscure transaction details while retaining self-custody.
A wallet designed to shield Bitcoin by default
Crest’s proposed wallet would offer “auto-shielding,” a process intended to move BTC into a privacy pool without requiring users to navigate a separate set of technical steps. Once shielded, users would be able to send private BTC transfers through the wallet, according to Citrea’s announcement.
Zero-knowledge proofs are cryptographic techniques that allow one party to demonstrate that a transaction meets certain conditions without exposing all of the underlying data. In a privacy-pool design, the system can validate that funds are legitimate and available to spend while concealing details such as the sender, recipient, and amount from public blockchain observers.
The approach resembles privacy features associated with Zcash, which uses zero-knowledge cryptography to support shielded transactions. Citrea is seeking to apply comparable functionality to Bitcoin through an execution layer rather than altering Bitcoin’s base protocol.
That architectural choice matters for the product’s intended user experience. Bitcoin’s main chain does not natively offer Zcash-style shielded transfers. A wallet built through Citrea would instead give users access to privacy features through an additional layer secured by Bitcoin, creating a separate environment for private activity.
Citrea’s announcement frames the wallet as a response to the compromises Bitcoin users can face when seeking greater transaction privacy. Those options can include relying on third-party services, moving funds through complicated workflows, or shifting into privacy-focused assets outside the Bitcoin ecosystem. Crest is positioning its planned mobile application as a simpler route that keeps the user in control of their private keys.
Private payments across Bitcoin and evm networks
The planned wallet extends beyond private Bitcoin transfers. Citrea said Crest intends to offer cross-chain onboarding from both Bitcoin and Ethereum, potentially allowing users to bring assets into the application from the two largest blockchain ecosystems.
The companies also described an intended private cross-chain payment feature. Under that model, a user could pay an Ethereum virtual machine, or evm, address using BTC while the recipient receives USDC or ETH. Evm refers to the computing environment used by Ethereum and many compatible networks for smart contracts and wallet addresses.
A product capable of handling that exchange privately would connect Bitcoin liquidity with Ethereum-based payment activity without requiring the sender to publicly expose the full path of the transaction. The announcement did not specify which networks, bridge mechanisms, liquidity providers, or swap infrastructure would support the feature.
Cross-chain functionality is often where wallet products become more complicated, since users may need to manage different network fees, asset conversions, and bridging processes. Citrea and Crest are presenting the mobile interface and automatic shielding as tools to reduce that friction, though the eventual user experience will depend on how the product handles those underlying steps.
Privacy products face a demanding operating environment
The acquisition arrives as privacy tools face increased scrutiny from governments and financial-crime authorities, particularly when products obscure the origin or destination of blockchain funds. Self-custodial software occupies a different category from a custodial financial intermediary, but developers of privacy-focused applications can still encounter legal and commercial constraints involving infrastructure providers, payment partners, app stores, and jurisdictions.
Citrea’s use of zero-knowledge proofs could offer a more flexible foundation than systems designed solely around anonymity. The same technology can be used to prove selected facts without disclosing every transaction detail, potentially creating room for privacy-preserving compliance tools if the product later chooses to support them. Citrea’s announcement did not describe any such functionality or provide details on how Crest would address regulatory requirements.
The immediate test will be whether Crest can deliver privacy without shifting technical complexity onto users. Many Bitcoin holders are accustomed to wallets that display balances and send transactions through a straightforward interface; adding privacy pools, cross-chain swaps, and multiple assets can quickly make that experience harder to understand.
Crest’s waitlist is available through its website, while Citrea said further details on the wallet launch will follow. Citrea lists Founders Fund, Galaxy, Maven 11, Delphi Digital, Erik Voorhees, and Balaji Srinivasan among its backers.
If the wallet launches with the features described, Citrea will be attempting to turn private Bitcoin transfers from a specialist workflow into a standard mobile-wallet option, while linking those transfers to payments and asset activity across Ethereum-compatible networks.
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