Guardian Wallet
Smart Vault

With Lost-Key Recovery

. ETH Offline Wallet . Generate Addr . Offline Sign . PushTx . SideShift . Airgap HowTo . PRO App

Guardian Wallet
Airgap Security - Quick HowTo

1. Why Offline Ethereum ?

Computer security is hard. Physical security is much easier to accomplish. Using Offline Ethereum allows you to store your wealth securely in an offline vault. Your own vault that you control physically.

You can transfer needed amounts to online wallets on your phone or computer. Ethereum is just like cash, you should only carry around spending money.

2. What is an Offline Ethereum Transaction ?

An offline Ethereum transaction is created with a computer that is not connected to the internet (or any network). Assuming the installation process was secure the computer can not be reached by hackers.

To create a Ethereum payment the offline machine can create a Ethereum transaction which can then be carried by an USB key or QR code. This information can then be copied to a machine that is online, and the transaction can be broadcast.

Your private key never touches the Internet. Maximum Security.

3. Generate Cold Storage Address

We use an open-source client-side keypair/wallet generators. The code is open and audited by the community. Heavily tested and trusted versions are included in the apps releases for local execution.

The code includes several sources of entropy from the users’s computer, and from mouse movement input, and keyboard input.

4. How to create an offline transaction?

Find the last used nonce on your offline-address. If it is a new address (that has only received incomming transactions) the nonce is 0 (zero). Nonces are incremented by one on each outgoing transaction.

Find the last used nonce on your address by going to, select your last outgoing transaction and click on "more info"

6. Create your transaction on your offline computer or mobile

Use the button Offline Generate. To do this you will need the private key of the address you want to send from, nonce, destination address and the amount you want to send.

Cut and Paste the values into the form and generate a transaction. Cut and the paste the generated transaction RAW HEX from the form field into a text file and place it on your USB key. Or scan the QR code.

7. Submit the transaction to the Ethereum network.

Use the button PushTx. This is the broadcast TX form from

At no point in this process is the private key data exposed through the transaction data. Your private key never touches the internet, for maximum security.

The biggest threat to an offline wallet is an USB-key virus that executes when plugged in. However, such viruses would have to be highly targeted, and can be mostly mitigated by disabling USB-auto- run on the offline computer.

Alternatively, you can transfer this information using the QR Code Generator Option. No networking of any kind needed.

8. Take time to get familiar with the process.

It is normal to be uneasy using new software to store your savings, especially with advanced features. Start on the Sepolia Testnet.

Make a few offline transactions with new addresses/keys and small amounts of ethereum.

After a couple of offline transactions you will be doing them in less than a minute. You will be able to say that you are your own bank!

2-Minute Video Demo

. ETH Offline Wallet . Generate Addr . Offline Sign . PushTx . SideShift . Airgap HowTo . PRO App

Replace Ledger or Trezor hardware wallets.

Full open source code. No forced updates. Use your own hardware devices with a portable offline-capable app.

Deposit privately cross-chain on your new cold storage address using


Guardian Wallet Whitepaper

Account Abstraction

ETH Offline Wallet

Why replace a hardware wallet?

Stake ETH from your Cold Wallet

Contact us