Is Safe Multisig Suitable for Individuals Holding Large Assets?
For personal large assets, Safe multisig is suitable—but it is not an out-of-the-box tool. The risk lies not in the contract code, but in "how you use it." If you simply gather multiple private keys and operate them all on the same computer, multisig becomes an expensive single point of failure.
The world's largest cryptocurrency exchange by trading volume,leading in security and liquidity.
New user benefit: Enjoy 20% off trading fees upon registration!
The $1.5 billion Bybit theft already proved this point: hackers did not compromise the Safe contract itself, but instead compromised the frontend, causing signers to unknowingly approve a malicious transaction. This is not a vulnerability in Safe; it is a breakdown of the trust chain caused by "all signers relying on the same interface."
Prerequisites
You have decided to use Safe to manage large assets (typically more than $100,000).
You understand the basic concept of multisig—transfers require approval from N out of M signers.
You are willing to invest time in setting up a secure process, rather than "create it and leave it alone."
Step 1: Evaluate the "Independence of Your Signers"
This is the core question that determines whether Safe is right for you.
Scenario A: Multiple private keys are spread across different devices / people / locations
Example: your main Ledger holds one key, your business partner's phone holds one, and an office cold wallet holds another. Each key is in a different physical location, and operations require face-to-face or phone confirmation.
This is the target scenario Safe was designed for, and it is appropriate.
Scenario B: All private keys are in your own hands and stored on the same phone or the same computer
Example: you set up a 3/3 in Safe, but all three signing wallets are different apps on your phone.
This is not multisig. An attacker who compromises that single device can obtain all the private keys at once. On the surface there are three keys, but in reality it is one key copied three times.
Not recommended. Consider switching to an MPC wallet, or at least distributing keys between a hardware wallet and a mobile device.
Completion criterion: You can clearly answer whether your signing keys are truly independent.
Step 2: Equip Each Signer with a Hardware Wallet
The advice from Slow Mist founder Yu Xian is straightforward: it is best to pair multisig with hardware wallets—especially ones that can properly parse complex signatures and flag abnormal risks.
Why a hardware wallet is necessary:
Software wallets (mobile / browser extensions) store private keys in an online environment, which carries higher risk.
Hardware wallets store private keys offline and can display transaction details for you to verify, avoiding "blind signing."
Completion criterion: At least two signers use hardware wallets (such as Ledger, Trezor, or OneKey).
Step 3: Establish an "Independent Verification" Process – the Most Critical Step
The lesson from the Bybit incident: do not rely solely on the transaction details shown on the official Safe page. You need an independent channel to verify "what exactly you are signing."
Method 1: Use multiple Safe frontend pages for verification
Safe has deployed two independent frontend pages for cross-verification:
https://eternalsafe.vercel.app/welcome/
https://eternalsafe.eth.limo/welcome/
Before signing, paste the transaction share link into the other frontend and check whether the parsed transaction content matches.
Method 2: Use an independent transaction parsing tool
The community has developed independent Safe transaction parsing tools. Paste the transaction link in, read the Safe backend data, and verify that the original transaction hash and signature are correct.
Pay special attention to: whether the contract address is correct, and whether the operation type is Call or Delegatecall—a Delegatecall + transfer combination is a high-risk signal.
Completion criterion: Before each signing, confirm that the transaction content is identical across at least two independent channels.
Step 4: Set an Appropriate Threshold and Recovery Plan
| Configuration | Use case | Risk |
|---|---|---|
| 2/3 | Personal large assets | Still recoverable if one key is lost |
| 3/5 | Team / family vault | Higher barrier, but more complex process |
Additional suggestions:
Enable the Safe{RecoveryHub} feature and set up social recovery to prevent assets from being locked forever after key loss.
If using institutional-grade solutions like Cobo, you can configure a "restricted operator" role—only allowing transfers of specific tokens to whitelisted addresses. Even if one signer is compromised, the attacker cannot modify wallet settings or transfer funds to other addresses.
Common Failure Cause
The "multisig = security" illusion
The security of multisig lies in "signer independence" and "verification process reliability," not in the size of the threshold number. If all signers depend on the same frontend page, the same set of RPC nodes, the same type of hardware wallet, a hacker can deceive everyone by compromising a single point.
Risk Reminders
Frontend attack risk: The Safe contract itself is secure, but it depends on the entire trust chain including the Safe UI, RPC nodes, and browser extensions. A compromise in any link could lead to signature tampering.
Gas cost: Each multisig transaction requires multiple on-chain signatures, so gas fees are higher than a normal transfer.
Creation fee: Creating a Safe multisig wallet on Ethereum mainnet requires about $0.25 in gas fees.
The world's largest cryptocurrency exchange by trading volume,leading in security and liquidity.
New user benefit: Enjoy 20% off trading fees upon registration!
How to Confirm the Setup is Correct
After completing the steps above, verify as follows:
Initiate a small test transfer (e.g., 10 USDT), go through the full signing process, and confirm that all signers receive identical transaction details.
Verify on at least two independent Safe frontends that the transaction content is the same.
After confirming the transaction executes successfully on-chain, check the Safe contract address and verify that all signer addresses and the threshold are correct.
If the test passes, your Safe multisig configuration has reached a basic security level. Afterwards, periodically (e.g., quarterly) reassess the independence of signing devices and the effectiveness of the verification process.
