> For the complete documentation index, see [llms.txt](https://docs.coti.io/coti-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coti.io/coti-documentation/build-on-coti/tools/contracts-library.md).

# Contracts Library

[**COTI Contracts**](https://github.com/coti-io/coti-contracts) is a library of smart contracts for COTI's GC technology, including MPC contract for secure computations, private ERC20 and ERC721 contracts, and test mocks for validation. These components enable privacy-focused and decentralized DeFi solutions.

## Clone, Build & Test

Full instructions for building and testing the package locally are available in the [coti-contracts GitHub repository](https://github.com/coti-io/coti-contracts)

## Installation

### Hardhat (npm)

```bash
npm install @coti-io/coti-contracts
```

{% hint style="info" %}
SDK versions < 1.0.0 are for use with the Devnet, versions >= 1.0.0 are for use with the Testnet
{% endhint %}

## Usage

See the [**coti-contracts-examples**](https://github.com/coti-io/coti-contracts-examples) repository for code examples.


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