We made Safe transactions verifiable offline.

SafeLens is an offline transaction verification tool for Gnosis Safe multisig wallets, built for the Ethereum Foundation. It solves a critical trust problem for multisig signers: instead of blindly approving transactions shown in a web UI, users can generate a self-contained evidence package and verify it completely offline with zero network access.

The tool translates raw calldata into human-readable format using the ERC-7730 clear signing standard, so signers always know exactly what they're approving.

Facts about SafeLens

• Client: The Ethereum Foundation
• Purpose: Offline verification of Gnosis Safe transactions
• Interfaces: Web generator, desktop app (Tauri), and CLI
• Challenges:
  • Implementing fully offline cryptographic verification with zero network calls
  • Translating raw calldata into human-readable format via ERC-7730 interpreters
  • Shipping across three interfaces (web, desktop, CLI) with a shared TypeScript core

Key Features

• Offline Verification: The desktop app ships with strict CSP rules preventing any network access during verification
• Clear Signing: Decodes raw calldata into human-readable transaction details using built-in and ERC-7730 interpreters
• Evidence Packages: Generate self-contained JSON evidence from any Safe transaction URL, verifiable anywhere

Relevant Links

• SafeLens Website
• Github