When a multisig member needs to switch devices, there is no need to transfer funds or have all members coordinate. The key insight is that "replacing the signing device" and "replacing the key" are two different things—as long as your seed phrase/private key remains unchanged, you are simply changing the "container." This is accomplished by importing the seed phrase or updating the device configuration.
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1. Distinguishing the Two Scenarios: Switching Devices vs. Swapping Keys
In a multisig wallet, each signer (owner) consists of two components: the seed phrase (mnemonic/private key) and the hardware signing device.
Scenario A: Only switching devices, not keys (seed phrase/private key remains unchanged)
For example, the old device is broken, lost, or being upgraded, but the seed phrase backup is still available. In this case, there is absolutely no need to move funds. You only need to import the private key or seed phrase into the new device, and then update the "signer type" in the multisig configuration.
Scenario B: Swapping keys (seed phrase has been exposed or needs replacement)
If the seed phrase has been compromised or lost, you will need to generate a new key, create a new multisig wallet, and then transfer funds from the old wallet to the new one—this process requires moving funds.
Prerequisites: Your seed phrase backup must still exist and remain uncompromised; you must have at least the number of signing keys required to meet the current multisig threshold (e.g., 2 out of 3 keys in a 2-of-3 setup).
2. Step-by-Step: Switching Devices Without Moving Funds
Step 1: Import the original private key/seed phrase onto the new device
What to do: Use your backed-up seed phrase or private key to import onto the new device (new phone, new hardware wallet).
How to do it: In the wallet app or hardware wallet, select "Import existing wallet" or "Import existing owner key," then enter the seed phrase.
When it is complete: You can see the corresponding wallet address on the new device.
Step 2: Bind the new device to the multisig configuration
What to do: The multisig wallet does not record "this specific phone"; it records "this signer's public key/address." After importing on the new device, the public key has not changed—you only need to update the "Signer Type."
How to do it: In wallet software (such as Keeper), go to "Manage Keys" → select the corresponding signer → enter settings → choose "Change Signer Type," and update the device information as prompted. For Safe-based multisig wallets, simply import the Owner Key and re-bind the management entry via "Add existing Safe."
When it is complete: The device information for that signer in the multisig configuration has been updated to the new device.
Step 3: Confirm activation with signatures meeting the threshold
What to do: Initiate a very small test transaction. Sign once with the old device (if still functional) and once with the new device to verify the new device's signature is valid.
How to do it: Initiate a test transfer in the wallet, use the new device to complete the signing process, broadcast, and check whether it succeeds.
When it is complete: The test transaction is successfully confirmed on-chain, indicating that the new device has fully replaced the old device's signing capability.
3. When You "Must" Transfer Funds
There is only one scenario where you must create a new wallet and move funds: the seed phrase/private key itself has been exposed or lost.
The process is: use the remaining uncompromised signers to first move funds out of the old multisig wallet, then create a new multisig wallet containing the new keys and transfer the funds into it. This situation unavoidably incurs on-chain transaction fees.
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Common Failure Causes
"I still have the old device, but I want to switch to a new phone": If the old device is still functional, switching devices typically only requires importing the seed phrase on the new device, then removing the old device from the multisig configuration and adding the new one.
Risk reminder: Any signer in a multisig wallet has the authority to initiate a proposal to modify the signer list. If you are merely switching devices and your seed phrase remains secure, do not transfer all funds to a new wallet out of an abundance of caution—this would needlessly pay on-chain fees and increase the risk of operational errors.
After completing the steps above, how do you confirm the migration is done?
Initiate a small test transaction, use the new device to independently complete a full signature, then broadcast it on-chain. If the transaction succeeds and the receipt is confirmed, the new device is active. Also, return to the member list of the multisig wallet to confirm the old device is no longer listed and the new device appears correctly.
