> For the complete documentation index, see [llms.txt](https://cifer.gitbook.io/cifer-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cifer.gitbook.io/cifer-docs/documentation/cifer-sdk/getting-started.md).

# Getting started

Cifer SDK supports browser and Node.js applications. Start by installing the package, then choose the identity model that matches your product.

## Requirements

* Node.js 18 or later
* TypeScript 5 or later is recommended
* Browser or Node.js runtime
* A wallet provider for Web3, or an Ed25519 signing implementation for Web2

## Installation

```bash
npm install cifer-sdk
```

The package includes ESM, CommonJS, TypeScript definitions, and subpath exports. Cifer does not require a specific wallet library. Runtime cryptographic helpers are provided by `@noble/secp256k1` and `@noble/hashes`.

## Select your path

| Web3                                      | Web2                                            |
| ----------------------------------------- | ----------------------------------------------- |
| Users connect an EIP-1193 wallet          | Users register with email and password          |
| Signed requests use a recent block number | Signed requests use a timestamp freshness value |
| Wallet submits transaction intents        | Managed sessions call Web2 wrappers             |
| Suitable for on-chain ownership           | Suitable when users should not need a wallet    |

Read the installation page first, then follow one quickstart from beginning to end.


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