Safe OpenSig

Safe OpenSig is a free, open source companion app that brings full transaction simulation and
"What You See Is What You Sign" guarantees to the Ledger Nano X, S Plus you already own.

No new hardware. No per transaction onchain fees.
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1. Hardware Level Integrity
Safe OpenSig provides the missing link for millions of Ledger Nano X and S Plus owners. It verifies and matches the transaction hashes displayed on your mobile device against the Safe Web UI and your Ledger screen, guaranteeing that what you are about to sign is exactly what you think it is.

2. True Transaction Simulation
We go beyond Clear Signing. Safe OpenSig executes a trustless simulation to give you a verifiable, human readable breakdown of the transaction's full consequence before it signs. See every balance change, token movement, and contract call. Instantly flag any malicious changes to your Safe's setup: signer removals, threshold changes, or unexpected module interactions.

3. Trustless Architecture
Safe OpenSig is trustless by design. The core hash matching runs offline. Simulation only relies on an RPC node, with results verified by a light client. No third-party backend is required. 
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‍The foundational security layers of Safe OpenSig are free and open source. But for any tool handling treasury-level assets, a rigorous security vetting process is non-negotiable. We are inviting a limited group of professional teams and DAO treasurers to join us early while we prepare a public release for Safe OpenSig.

This isn't just testing software; it's a call to collaborate on security standards. Your team's contribution will help audit and battle test Safe OpenSig before public release, ensuring its stability for the entire ecosystem.