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The Final Word for
Multisig Signing.

Stop crossing your fingers before every $1M signature.
Safe OpenSig eliminates blind signing for signers who can't afford a mistake.
Apply for Genesis Program
View on Github
Trusted by professional treasury managers and foundations
FOUNDATION
OpenSig makes hardware wallet signing with Safe actually usable. We need more shots on target for the blind signing problem, and this one lands.
Jan
Safe Foundation
See What You're Actually Signing

REVEAL THE TRUTH

Raw transaction data is just bytes and hex. You trust your wallet to decode it, but that trust can be exploited.
‍
Safe OpenSig runs a local EVM simulation:
• What tokens will transfer
• What approvals will be granted  
• Whether the transaction is malicious

Know before you commit.
How it works
See Exactly What Your Ledger Will Show

Zero discrepancy.

Safe OpenSig shows a pixel perfect mirror of your Ledger Nano S, S+, or X before you sign.

Works with the Ledger you already own.
Cryptographic Integrity

Trust math, not providers

Most wallets trust a single RPC provider. If it's compromised, you're signing based on lies.
‍
Safe OpenSig verifies against multiple independent nodes using cryptographic proofs. All nodes must agree, or the simulation is rejected.
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Mathematical certainty. Not hope.

Independent. Isolated. Secure

Browser extensions get compromised. Wallet UIs get injected. Malicious scripts swap addresses while you're not looking.

Safe OpenSig runs offline first, completely isolated from your browser.
Even if your browser is compromised, your verification isn't.

Step 1: Construct

Build your transaction within the Safe Web UI as usual.

Step 2: Simulate

View a human readable summary of the transaction intent.

Step 3: Verify

Validate simulation results against independent nodes.

Step 4: Preview

View a 1:1 digital mirror of your Ledger screen before you commit.

Verify, Don't Trust

Others charge 0.05% per signature. On $5M, that's $2,500 every time.

OpenSig have no fees per transaction. No markup on gas.
No variable fee on transfers. No third-parties, period.

Community

Ideal for Self-Managed Signers
0/mo
FREE FOREVER
Safe tx Hash Decoding
Reconstruct the Safe transaction hash locally to ensure the data on your screen matches exactly what you see on Safe UI
Ledger Mirror
Perform physical to digital hash matching in an isolated environment to prevent blind signing errors
Bring Your Own Node
Bring your own node for total sovereignty
Simulation (via BYO Node)
Use your own Nodes to run a pre-flight of transactions and preview state changes
MPT Proofs (via BYO Nodes)
Use your own node connection to run Merkle Patricia Trie proofs for cryptographic state validation.
Offline Mode
Verify a transaction without an internet connection
Public Download Links Coming Soon

Pro

High-Value Signers & Teams
$49/ mo / seat
Everything in COMMUNITY, plus
Simulation (zero-config)
Automatically decodes complex hexadecimal data into a clear summary of asset inflows, outflows, and contract interactions
MPT Proofs (zero-config)
Uses independent nodes to fetch eth_getProof data, cryptographically proving the blockchain state is real and unmanipulated
Zero Config Infrastructure
Access managed security that automate the entire verification process without the need to manage your nodes or technical setup
Apply to Genesis
$0 FOR 3 MONTHS (50 SLOTS AVAILABLE)

Institution

Large Funds & Security Councils
$10,000/  year / team
Everything in PRO, plus
Signed Local Audit Logs
Automatically generates a cryptographically signed "Proof of Diligence" for every transaction, ready for board level audits
Multi-Signer Oversight
Standardize a high integrity signing workflow across your entire team with shared security policies
Phone Call Support
Get a direct line to our security engineering team for custom contract decoders and priority infrastructure assistance
Request Demo
1 MONTH TRIAL OFFERED

The Genesis Program

50 SPOTS AVAILABLE

$0 THREE MONTHS PRO

We are seeking 50 Genesis Partners to help define the future of treasury integrity. Selected signers will receive three months of the Pro Tier at no cost. Help us eliminate blind signing by the auditing standard for the Safe ecosystem.
Custom API request number and rate
Direct access to the core dev team for custom protocol decoders.
Custom API request number and rate
A permanent "Partner" status in our ecosystem.
Apply for Genesis

Verification for Every Safe Transaction

When you're moving $100k+, blind signing isn't an option

Current Treasury Workflow

With Safe OpenSig

Blind signing with hardware wallet or mobile app — you confirm transaction hashes, not consequences

Verification Method

Hardware-verified simulation shows exact asset movements, recipient addresses, and contract interactions before signing

Verification Method

Small hardware wallet screen or mobile interface with truncated addresses and technical data

Screen Preview

Full desktop display with complete transaction breakdown, token movements, and contract call details

Screen Preview

Vulnerable to compromised Safe interfaces (see: Bybit $1.4B loss from compromised Safe backend showing fake transaction data)

Attack Protection

Trustless verification — OpenSig runs simulation on your hardware, impossible to show fake transaction consequences

Attack Protection

No record of what you actually verified before signing — just transaction hashes on-chain

Audit Trail

Cryptographic proof of exactly what was shown to signers before each approval — complete compliance audit trail

Audit Trail

Ledger Enterprise: $500/month minimum. One prevented error on $100k transfer pays for years of security infrastructure.

Cost

Free and open source. One prevented error pays for 167 years of OpenSig (if we charged Ledger rates).

Cost

Verification Method

Review transaction hash on Ledger screen. No visibility into actual consequences. Treasury manager must trust the hash matches intended action.

Verification Method

Full transaction simulation displayed on Ledger screen. See exact token amounts, recipients, contract calls. Verify consequences, not just hashes.

See OpenSig in Action
a clarity LAYER. NOT A WALLET

SIGN WITH ABSOLTE CERTAINTY

Safe OpenSig doesn't replace Safe, it perfects it.
Professional grade verification for treasury managers who need confidence without second-guessing.

Sign with absolute certainty.
Apply to Genisis
View on Github
Safe® is a trademark of the Safe Ecosystem Foundation. Ledger®, Nano S®, Nano X®, and Nano Plus® are trademarks of Ledger SAS. Safe OpenSig is an independent verification instrument developed by Candide Labs and is not affiliated with, sponsored by, or endorsed by Safe or Ledger.
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