--- title: "Fhenix Deploys CoFHE Coprocessor on Ethereum and Arbitrum for Encrypted Balances" description: "The rollout introduces fully homomorphic encryption coprocessing, dual-mode tokens, and plans for a confidential stablecoin with Offchain Labs' Tandem." url: https://basisdesk.news/news/fhenix-cofhe-encryption-coprocessor-ethereum-arbitrum published: 2026-10-21T13:08:01.375Z modified: 2026-10-21T13:08:01.375Z section: Tech & Protocols author: Basis Desk Newsroom (AI-generated, source-verified) sentiment: neutral tickers: [ETH, ARB] tags: [fhenix, fhe, ethereum, arbitrum, privacy, smart-contracts] license: Quote with attribution to Basis Desk (basisdesk.news). Not financial advice. --- # Fhenix Deploys CoFHE Coprocessor on Ethereum and Arbitrum for Encrypted Balances The rollout introduces fully homomorphic encryption coprocessing, dual-mode tokens, and plans for a confidential stablecoin with Offchain Labs' Tandem. ## At a glance - **What happened:** Fhenix deployed its CoFHE encryption coprocessor to Ethereum and Arbitrum mainnets on Oct. 21, 2026, bringing homomorphic encryption to production smart contracts. - **Why it matters:** Contracts can execute logic using private balances and hidden strategies without wrapping tokens or exposing user holdings onchain. - **Who is affected:** Ethereum and Arbitrum developers, liquidity providers using AlphaEngine and Fluton, and institutional partners deploying confidential applications. - **Takes effect:** 2026-10-21 - **What's next:** Fhenix plans to roll out three additional apps in Q4 2026 and announce two strategic institutional partnerships. - **Status:** announced - **Primary source:** [Fhenix Goes Live on Ethereum and Arbitrum, Letting Contracts Compute on Hidden Balances](https://unchainedcrypto.com/fhenix-goes-live-on-ethereum-and-arbitrum-letting-contracts-compute-on-hidden-balances/) — unchainedcrypto.com ## Key points - Fhenix launched its CoFHE encryption coprocessor on Ethereum and Arbitrum mainnets on Oct. 21, 2026. - The deployment introduces dual-mode tokens that switch between public and confidential states without wrapping or bridging. - Fhenix is developing a confidential stablecoin alongside Offchain Labs' venture arm Tandem, with three more apps launching in Q4. ## Editorial remark - **Context:** Blockchains like Ethereum expose balances and transactions publicly by default. While FHE has been researched to enable confidential computation, high computational overhead previously confined implementations to testnets. - **Impact:** Ethereum and Arbitrum developers can build decentralized applications handling private orders, hidden balances, and obscured strategies without requiring wrapped tokens or separate execution chains. - **Watch:** Keep track of the deployment of three additional applications on CoFHE in Q4 2026 and the formal announcement of two institutional partnerships. Privacy startup Fhenix deployed its CoFHE encryption coprocessor to the $ETH Ethereum and $ARB Arbitrum mainnets on Oct. 21, 2026, enabling smart contracts to execute computations on obscured balances and trading strategies without exposing the underlying data publicly [1]. Prior to the mainnet rollout, the system had operated strictly in public test environments [1]. CoFHE relies on fully homomorphic encryption (FHE), a cryptographic method allowing mathematical operations on encrypted data without preliminary decryption [1]. Fhenix noted that the coprocessor processes intensive encrypted computations off-chain before relaying verified results back to smart contracts across both base layers [1]. Developers can integrate the capability through a Solidity import using native-style encrypted data types [1]. The production release also implements a dual-mode token structure, allowing asset holders to shift balances between public and confidential modes in a single transaction without bridging or wrapping assets [1]. Fhenix stated that smart contract security firm Consensys Diligence completed an audit of the architecture prior to deployment [1]. ## Launch Apps and Confidential Stablecoin Plans The coprocessor launched with two initial applications: Fluton, a confidentiality system built on encrypted intents, and AlphaEngine, a platform where strategists deploy encrypted execution strategies [1]. For AlphaEngine, operators match and decrypt swap intents inside trusted execution environments [1]. Fhenix expects three additional decentralized applications to deploy on CoFHE during the fourth quarter of 2026 [1]. Looking ahead, Fhenix founder Guy Zyskind stated that the company is partnering with Tandem, the venture arm of Arbitrum creator Offchain Labs, to build a confidential stablecoin [1]. Tandem previously invested in Fhenix in 2025 [1]. Fhenix also plans to disclose two institutional partnerships in the coming weeks [1]. The push for encrypted balances follows wider industry efforts to bring confidentiality to tokens, an area that has faced operational challenges: in late May, a court order required Circle to freeze approximately $12.6 million in a confidential USDC contract administered by cryptography firm Zama [1]. ## FAQ **What is Fhenix's CoFHE coprocessor?** CoFHE is an off-chain coprocessor using fully homomorphic encryption (FHE) to perform computations on private data and return the results to smart contracts on Ethereum and Arbitrum. **What are dual-mode tokens?** Dual-mode tokens allow users to switch between a public balance and a confidential balance within a single transaction without bridging or wrapping the underlying asset. ## Sources 1. [Fhenix Goes Live on Ethereum and Arbitrum, Letting Contracts Compute on Hidden Balances](https://unchainedcrypto.com/fhenix-goes-live-on-ethereum-and-arbitrum-letting-contracts-compute-on-hidden-balances/) — unchainedcrypto.com, 2026-10-21 --- Basis Desk Newsroom · AI-generated, source-verified · https://basisdesk.news/about/how-we-use-ai