# Fhenix Brings Confidential Finance to Ethereum and Arbitrum Mainnet

> CoFHE lets applications compute on encrypted financial data, bringing privacy controls to tokenized assets, payments and trading strategies.

By Lidia Yadlos · October 22, 2026

Canonical: https://blockster.com/fhenix-cofhe-ethereum-arbitrum-mainnet

Putting a fund, payment or trading strategy on a public blockchain creates a difficult question: how much of its financial activity should everyone else be able to see?

[Fhenix](https://www.fhenix.io/) is bringing its answer into production. The company launched **CoFHE on Ethereum and Arbitrum mainnet on October 21**, giving developers infrastructure for applications that work with encrypted balances, positions and other sensitive values.

The company frames the launch around a **$1.5 trillion tokenization opportunity** it says is held back by privacy constraints. That is Fhenix’s description of the potential market, rather than the value of assets already deployed through CoFHE.

The practical milestone is that builders can now deploy confidential applications on both networks. Fhenix’s mainnet initially requires contracts to be approved for an allowlist; its testnets remain open to developers.

[Post from @fhenix on X](https://twitter.com/fhenix/status/2112888973177807138)

## Computing Without Exposing the Numbers

CoFHE uses **fully homomorphic encryption, or FHE**, which allows calculations to run on encrypted information. An application can update a confidential balance or process a private bid without making the underlying number public during computation.

The heavy processing takes place offchain. Contracts on Ethereum and Arbitrum reference encrypted values and request operations, while the coprocessor performs the calculations. Access controls determine who can decrypt particular results.

Fhenix says its dynamic throughput scales with demand. Developers work with a Solidity library and encrypted data types, bringing confidentiality into the tools they already use to build Ethereum applications.

## One Asset With Public and Confidential Balances

The launch also brings Fhenix’s dual-mode token approach into production. A token built with the design can hold public and confidential balances behind the same token address. Holders move value between those states without creating a separate wrapped asset or bridging to another chain.

That could let a business keep part of a stablecoin balance available for ordinary DeFi activity while shielding another portion for confidential transfers.

Fhenix’s [technical explanation](https://www.fhenix.io/blog/why-dual-mode-tokens-are-inevitable) makes the boundaries clear: the public balance retains compatibility with existing wallets, exchanges and DeFi protocols. The confidential balance has more limited compatibility today. Amounts and balances can be encrypted while sender and recipient addresses and transaction timing remain visible.

The benefit is giving holders a choice within one asset, with the ability to return funds to public mode when they need existing liquidity and applications.

## Obolos and Alpha Engine Join the Launch

Fhenix’s public mainnet announcement identifies **Obolos and Alpha Engine** as its two launch design partners.

Obolos focuses on compliance infrastructure and confidential ownership records for tokenized equity. Alpha Engine is building a network where traders and agents can submit private strategies, have them evaluated confidentially and compete for capital without revealing their approach.

These applications show two different reasons financial data may need protection: an issuer’s investor records and a strategist’s trading edge. Both connect confidentiality to an identifiable business need.

[Post from @fhenix on X](https://twitter.com/fhenix/status/2112889916745265154)

## Security Review and the Next Applications

Fhenix says Consensys Diligence audited the system ahead of launch. Its published [account of that engagement](https://www.fhenix.io/blog/fhenix-x-consensys-diligence-rethinking-smart-contract-security-for-encrypted-computation) covers confidential tokens, a vault, an over-the-counter trading desk and a sealed-bid auction.

The work highlights how encrypted contracts require different handling of permissions, payments and failure conditions. Keeping a value encrypted does not, by itself, establish who is authorized to use it.

The mainnet release follows earlier work covered by Blockster, including Fhenix’s [confidential trading research with Monaco Research](https://blockster.com/fhenix-and-monaco-research-explore-bringing-confidential-trading-to-defi) and its [acquisition of Sunscreen](https://blockster.com/fhenix-acquires-sunscreen-to-accelerate-quantum-safe-privacy-for-ethereum) to strengthen its encrypted-computation research.

Founder Guy Zyskind said the launch puts that work into developers’ hands:

> “CoFHE is now live on Ethereum and Arbitrum mainnet, with competitive performance and a UX that's simple for any builder who wants privacy in their dApp.”
>
> — Guy Zyskind, Founder, Fhenix

Fhenix plans three more applications in Q4 and two institutional partnership announcements in the coming weeks. Zyskind also said the team is working on a confidential stablecoin with Tandem.

**Blockster’s take:** confidentiality becomes useful when it solves a concrete problem: protecting an investor’s holdings, a company’s payment amounts or a trader’s strategy. Bringing that capability to Ethereum and Arbitrum gives builders a route to serve those needs where financial applications already operate. The next test is how effectively the first applications turn encrypted computation into everyday financial tools.