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Openzeppelin Confidential Contracts

OpenZeppelin Confidential Contracts is an experimental Solidity library of contracts and utilities that use Zama’s fhEVM coprocessor and its fully homomorphic encryption capabilities to support confidential transactions.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Openzeppelin Confidential Contracts — OpenViST project profile in Smart Contracts.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when developing Solidity contracts that need to perform confidential transactions through Zama’s fhEVM coprocessor.

Who it is for

  • Solidity developers building contracts for Zama fhEVM.
  • Teams creating confidential token contracts based on ERC7984.

Documented uses

  • Install the library in a Hardhat project with npm.
  • Import ERC7984 as a base for a token contract.
  • Configure a confidentiality-enabled contract to use the fhEVM coprocessor.
Before you choose

Requirements & limits

The repository is public and licensed under MIT by default where a contract file does not specify another license.

  • The library is explicitly described as experimental.
  • Confidentiality-enabled contracts require coprocessor configuration, with ZamaEthereumConfig given as an example.
  • The README warns that some functions may not revert on failure in the way conventional contracts do.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install the library and import ERC7984 in a Hardhat project

Add the confidential-contracts package and reference its ERC7984 contract in Solidity.

Before you start

  • A Hardhat project using npm.
  • Solidity ^0.8.27, as shown in the README example.

Steps

  1. Install the package with the command below.

    Documented command
    npm install @openzeppelin/confidential-contracts

  2. Import ERC7984 from @openzeppelin/confidential-contracts/token/ERC7984/ERC7984.sol in a Solidity file.

Expected outcome

The package is installed and the ERC7984 contract is available to reference in the project.

Guide limitations

  • This covers package installation and importing only, not deployment or transaction execution.
  • Confidentiality-enabled contracts must also set coprocessor configuration, for example by inheriting ZamaEthereumConfig.
  • The library is described as experimental; its README warns that some functions may not revert on failure as conventional contracts do.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
9 October 2026
Original website title
OpenZeppelin/openzeppelin-confidential-contracts · Official homepage title · retained in its source language
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