Safe Transaction Verifier

A public good tool to help users verify Safe (Gnosis Safe) transactions before signing or execution.

Overview

Safe Transaction Verifier is a public good tool developed by Mimir that helps users verify transaction details from any Safe-compatible frontend. It provides an additional security layer by allowing users to independently verify transaction details by pasting the Safe transaction URL.

Features

• Compatible with all Safe-compatible frontends (not limited to safe.global)
• Parse and decode Safe transaction calldata
• Verify transaction signatures
• Display human-readable transaction details
• Support multiple networks (Ethereum, Polygon, etc.)
• User-friendly interface
• No connection to wallet required

Usage

1. Visit safe-tx-verifier.mimir.global
2. Copy your Safe transaction URL (from any Safe-compatible frontend)
3. Paste the URL into the verifier
4. Review the decoded transaction details
5. Verify signatures and parameters before signing or execution

Integration for Safe-compatible Multisig Products

Multisig platforms can integrate Safe Transaction Verifier by generating properly formatted URLs with encoded Safe transaction links.

Direct Integration URL

Use this pattern to create verification links: https://safe-tx-verifier.mimir.global/?url={encoded-safe-tx-link}

Parameter Requirements:

1. encoded-safe-tx-link
   • Must be URL-encoded per RFC 3986 standard
   • Should point to any Safe-compatible transaction page (self-hosted or official)

Example Integration

Sample URL structure:

https://safe-tx-verifier.mimir.global/?url=https%3A%2F%2Fapp.safe.global%2Ftransactions%2Ftx%3Fsafe%3Deth%3A0x9B2...833%26id%3Dmultisig_0x9B2...f1d

JavaScript encoding example:

const rawURL = "https://app.safe.global/transactions/tx?safe=eth:0x9B2...833&id=multisig_0x9B2...f1d";
const encodedURL = encodeURIComponent(rawURL);
// Generates: https%3A%2F%2Fapp.safe.global%2Ftransactions%2Ftx%3Fsafe%3Deth%3A0x9B2...833%26id%3Dmultisig_0x9B2...f1d

Deploy Your Own Instance

As a public good, we encourage anyone to deploy their own instance of this verifier:

bash

# Install dependencies
yarn install

# Run development server
yarn dev

# Build for production
yarn build

Security & Decentralization

This tool is:

• Completely open source
• No wallet connection required
• Client-side only
• No data storage

Roadmap

To ensure maximum decentralization and security:

• Deployment on GitHub Pages
• IPFS hosting
• Support for more Safe-compatible frontends
• Enhanced transaction decoding capabilities

Why We Built This

Following the Safe front-end attack incident in July 2023, where developer credentials were compromised leading to significant losses, we recognized the need for an independent verification tool. This allows users to double-check their transactions before signing or execution, adding an extra layer of security.

Support

• Create an issue for bug reports or feature requests
• Follow us on Twitter @Mimir_global
• Visit our self-hosted {Safe} service: safe.mimir.global

Acknowledgments

• Safe Team
• Mimir Team
• All contributors to this project

Made with ❤️ by Mimir

This is a public good. Feel free to deploy, modify, and share.