Fhenix / Explained

What Is Fhenix? A Practical Guide to FHE & CoFHE

Fhenix is focused on confidential computation for EVM-compatible blockchains using Fully Homomorphic Encryption (FHE). The idea is simple: applications can compute over encrypted values instead of exposing the underlying plaintext to every observer.

The current architecture is centred on CoFHE, Fhenix’s FHE coprocessor. CoFHE handles intensive encrypted computation off-chain while keeping the application compatible with standard EVM development patterns.

FHE

Fully Homomorphic Encryption allows computation on encrypted data without first revealing the plaintext. That makes it useful for private financial logic, governance, identity and other sensitive applications.

CoFHE

CoFHE is Fhenix’s coprocessor for encrypted computation on EVM-compatible chains. Fhenix currently lists public testnet deployments on Ethereum Sepolia, Arbitrum Sepolia and Base Sepolia.

Confidential DeFi

The broader goal is to make privacy usable inside composable EVM applications — from private balances and lending to confidential auctions, governance and other on-chain workflows.

How Fhenix fits together

You can think of the ecosystem in layers: Ethereum-compatible execution stays familiar, sensitive values can remain encrypted, and CoFHE handles the heavy FHE computation away from the main execution path.

  1. Ethereum / EVM. Applications continue using familiar smart-contract environments and wallets.
  2. Encrypted values. Sensitive inputs and state can be represented using FHE-aware data types instead of plain values.
  3. CoFHE. The coprocessor performs the expensive encrypted computation and returns encrypted results to the host chain.
  4. Permissions. Decryption is controlled so an application can reveal specific values only to an authorised user or workflow.
  5. Applications. Developers can use the model for private DeFi, confidential governance, identity and other privacy-sensitive use cases.
This page is the educational starting point for the Fhenix ecosystem. For current deployments, SDK instructions and official announcements, verify the latest material on Fhenix’s official site and documentation.