---
title: "Address Book"
slug: "address-book"
updated: 2025-09-10T04:28:59Z
published: 2025-09-10T04:28:59Z
canonical: "docs.stackup.fi/address-book"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stackup.fi/llms.txt
> Use this file to discover all available pages before exploring further.

# Address Book

This is a reference to the canonical and verified contracts used by the Stackup platform. All addresses are deterministically deployed using the [permissionless](https://github.com/Arachnid/deterministic-deployment-proxy) `CREATE2` [factory](https://github.com/Arachnid/deterministic-deployment-proxy) and has the same address on every chain.

## Keystore

**Open source code available at** [**github.com/stackup-wallet/keystore**](https://github.com/stackup-wallet/keystore)**.**

| Contract | Address |
| --- | --- |
| Keystore | [0x69C9F626b5Bd934C0F9806346682eD407FB978d3](https://etherscan.io/address/0x69C9F626b5Bd934C0F9806346682eD407FB978d3#code) |
| KeystoreAccountFactory | [0x625cF8EDec3f68d48D3aA385F356524B04760BE8](https://etherscan.io/address/0x625cF8EDec3f68d48D3aA385F356524B04760BE8#code) |
| UserOpECDSAVerifier | [0x52949503fF5c34caEa4FC98F0723ebD0c300f232](https://etherscan.io/address/0x52949503fF5c34caEa4FC98F0723ebD0c300f232#code) |
| UserOpMultiSigVerifier | [0x0A3BC9523755f2B4e95458E1d8ABa8441cB61927](https://etherscan.io/address/0x0A3BC9523755f2B4e95458E1d8ABa8441cB61927#code) |
| UserOpWebAuthnVerifier | [0xE19620169A26aEbC4Fe229A073639da6b009bF1a](https://etherscan.io/address/0xE19620169A26aEbC4Fe229A073639da6b009bF1a#code) |
| UserOpWebAuthnCosignVerifier | [0x939C10DCdA11A73eCCc563340aBE3d257859dC6d](https://etherscan.io/address/0x939C10DCdA11A73eCCc563340aBE3d257859dC6d#code) |

## Forwarding Address

**Open source code available at** [**github.com/stackup-wallet/forwarding-address**](https://github.com/stackup-wallet/forwarding-address)**.**

| Contract | Address |
| --- | --- |
| ForwardingAddressFactory | [0xb15dcf07aE4bA9423c9ee0Aba58773C9fd7ec293](https://etherscan.io/address/0xb15dcf07aE4bA9423c9ee0Aba58773C9fd7ec293#code) |