# Fhenix

> Fhenix: FHE coprocessor.

Part of the Soda Labs Privacy Hub, a neutral directory of the on-chain privacy
landscape: https://www.sodalabs.xyz/privacy-hub

## Key facts

- Entry type: Privacy project
- Category: FHE coprocessor
- Technology: Fully homomorphic encryption (FHE)
- Website: https://www.fhenix.io
- Tags: FHE, coprocessor
- Canonical page: https://www.sodalabs.xyz/privacy-hub/fhenix

## Overview

Fhenix builds CoFHE, a fully homomorphic encryption coprocessor that lets an ordinary EVM contract hand encrypted work to an off-chain compute layer and get a verified result back. A team can add confidential state to the chain it already ships on instead of migrating to a new one. The architecture came out of the team's own benchmarking: an early plan for a dedicated FHE rollup gave way to the coprocessor once the numbers came in, and a Series A followed the redesign. Encrypted operations resolve asynchronously rather than inside the same block, on the timescales FHE itself sets, and a threshold committee holds the decryption keys. A mainnet first sketched for early 2025 was still running as a testnet through mid 2026.

## About Fully homomorphic encryption

Computation is performed directly on ciphertext, so results decrypt correctly without the data ever being decrypted during the computation. Compared side by side with the other approaches at https://www.sodalabs.xyz/taxonomy.

## Sources

- [CoFHE docs](https://cofhe-docs.fhenix.zone/fhe-library/introduction/quick-start)
- [CoFHE contracts](https://github.com/Fhenixprotocol/cofhe-contracts)
- [Series A and the timeline](https://www.theblock.co/post/298443/ethereum-layer-2-fhenix-confidentiality-series-a-funding-testnet)

## Related entries

- [Zama](https://www.sodalabs.xyz/privacy-hub/zama): FHE coprocessor
- [Aleo](https://www.sodalabs.xyz/privacy-hub/aleo): Privacy L1
- [Arcium](https://www.sodalabs.xyz/privacy-hub/arcium): Confidential compute network
- [Aztec](https://www.sodalabs.xyz/privacy-hub/aztec): Privacy L2
- [Bubble](https://www.sodalabs.xyz/privacy-hub/bubble): Enterprise confidential finance
- [COTI](https://www.sodalabs.xyz/privacy-hub/coti): Confidential EVM L2 · in production