DeFi has always promoted itself as being publicly verifiable, yet traders may not be willing to reveal every detail of their balances, positions, and strategies to everyone. On October 23rd, Fhenix announced that its homomorphic encryption computing coprocessor, CoFHE, had been launched on the Arbitrum mainnet, with Obolos and Alpha Engine among the first batch of design partners. The announcement did not mention creating a new chain that would require users to migrate their assets; instead, it focused on enabling applications on existing chains to process encrypted data within smart contracts. This direction provides new privacy tools for blockchain finance. However, just because it's "launched on the mainnet" does not mean that all developers can deploy it at will now.
Fhenix clearly states at the end of the article that we are currently in the partner mainnet phase, and new applications must go through team review and whitelist processes before they are fully available. They plan to launch three more applications in the fourth quarter and also announce two institutional collaborations; these are future arrangements and not a list of products that have already been implemented. If the news headline only mentions 'full launch,' it could lead to confusion between the current network status and future plans. For users, whether they can access specific applications, whether assets support encryption mode, and who is responsible for decryption and compliance are issues that are more direct than just the term 'mainnet.'
The issue that dual-mode assets need to address is not inter-chain transfers.
The so-called dual-mode design mentioned by Fhenix allows holders to switch the balance of the same asset from public mode to confidential mode, and vice versa. Officials emphasize that this step does not require bridging the tokens to another chain; the assets remain within the original ecosystem. Traditional privacy solutions often move liquidity from the public market to separate pools, which leads to issues with composability and trading depth. The dual-mode approach aims to avoid such separation: applications can handle both public and confidential states within the same environment. However, whether it can work seamlessly with specific wallets, exchanges, and the DeFi protocol still depends on the implementation and actual testing of each application.
The core of homomorphic encryption is to allow systems to perform computations on data without directly viewing the plaintext. For on-chain transactions, this means that strategy parameters, certain balances, or quotes do not have to be made public to all observers, while still maintaining a degree of verifiability. However, this does not mean that “everything on the blockchain becomes invisible.” Transaction metadata, contract calls, counterparty behavior, the paths of funds entering and leaving, and compliance disclosures can still expose information. A rigorous privacy product needs to clarify which layers of data are protected, under what conditions decryption is possible, and how audits can be conducted in case of disputes, rather than simply displaying the names of the encryption algorithms.
The positioning of the partners on the first day also varies. Obolos targets on-chain equity, options, and financing infrastructure with KYC, investor qualifications, and transfer restrictions; Alpha Engine focuses on traders and AI agents submitting and evaluating non-public strategies. Fhenix states that both parties completed technical and security audits before going live. It should be noted that 'completing the audits' does not mean there will be no vulnerabilities in the future, nor does it mean that these applications have already covered a wide range of users. It merely indicates that the teams established inspection processes before launching the first batch of integrations.
The announcement also cites the audit opinion of Consensys Diligence on the system. Unlike ordinary public contracts, contracts in cryptographic computing may not be able to directly read the data they are processing. Therefore, security checks not only assess whether the code is executing as expected but also consider which participants can submit ciphertext, trigger decryption, and use the output to infer private information. Fhenix uses such audits as a basis for going live, but external users should still review the scope, version, and uncovered items of the public reports. Any audit is only targeted at the implementation at a given time and within a specific range and does not replace continuous monitoring.
What exactly needs to be verified during the partner mainnet phase?
For the development team, the most realistic first step is not to immediately migrate large amounts of assets to the new system, but to use the same FHE.sol library and CoFHE SDK on the open test network to verify product requirements. Fhenix states that the test environments for Ethereum Sepolia, Arbitrum Sepolia, and Base Sepolia are available; new applications on the partner mainnet, however, require a whitelist. Developers need to test each item individually, including the costs of encryption and decryption, latency, failure recovery, permission management, as well as interactions with existing contracts. Even if private transactions can be completed, it would still be difficult for the product to handle real-money transactions in cases of congestion or abnormal conditions.
For institutions, privacy and compliance are not mutually exclusive options. When dealing with on-chain funds or restricted assets, participants may need to prove their identity and transaction records to auditors and designated personnel required by regulators, yet they do not wish to make this information public to every observer on the chain. Cryptographic computing provides a technical approach, but in practice, it is still necessary to define who can view what, when they can view it, and how to recover in case of key loss or when the institution withdraws from the system. The first batch of cooperation cases involving Fhenix help to explore these rules, but they are not yet sufficient to prove that all types of institutional financial activities have been transferred to the blockchain.
The announcement mentions the research on confidential stablecoins with Tandem, as well as future quarterly applications and collaborations, all of which should be considered matters to be observed. Indicators worth continuous tracking include the actual processing capacity of the mainnet, the number of independent developers, the progress of public audits, costs, and user experience, rather than just looking at the list of partners. If it is later opened to all developers, it is also necessary to verify whether the entry requirements and security boundaries have changed. At this stage, what users need to know most is that the product is already running on the real Arbitrum mainnet, but the service access is still subject to screening.
The significance of the launch of CoFHE is that privacy is no longer solely achievable by "leaving the public ecosystem"; however, its limitations are also evident: performance, auditing, permissions, and application availability all require verification through actual traffic. Only by considering these two aspects together can we make the most accurate judgment about this news.
Source: Fhenix Official Announcement on October 23, 2026 https :// www.fhenix.io / blog / fhenix-mainnet-goes-live-bringing-confidentiality-to-arbitrum
