OverviewKeep private material on an air-gapped device that never needs to touch the network.
Cold wallet
A cold wallet whose keys never go online
Separate signing from connectivity by keeping keys offline while still making everyday verification and transfers practical.
- Watch wallet for balances
- QR only, no cable or Bluetooth
- Signs for MultiSig too
Offline signing for BTC, ETH, BNB Chain, TRON, Solana, TON and more
Try itSign offline. Broadcast online.
Send0.25 BTC
Unsigned transactionbc1q…7m4xWaiting for the signed QR
Send0.25 BTC
bc1q…7m4xSent to the network
Ready to scan
Send0.25 BTC
Check the details, then signbc1q…7m4xSigned. Show this QR to the online phone.
Key stayed on this phone
Your online phone builds the transaction and shows it as a QR code.
Feature highlightsMirror addresses on an online device to monitor balances and prepare transfers safely.
No extra hardwareTurn a spare phone into an air-gapped cold signer — nothing to buy.
Feature highlights
Cold wallet
Use one device to stay offline and another to prepare transactions, monitor balances, and handle broadcasting.
Offline signer
Keep private material on an air-gapped device that never needs to touch the network.
Watch wallet pairing
Mirror addresses on an online device to monitor balances and prepare transfers safely.
Human-verifiable QR flow
Scan unsigned data in, sign offline, and scan the signature back to broadcast.
How it works
Prepare on a Watch Wallet
Sign on an offline device
Scan back and broadcast
How it works
Transfer only QR-encoded transaction data between devices, so keys stay isolated throughout the signing process.
Mirror addresses on an online device to monitor balances and prepare transfers safely.
Keep private material on an air-gapped device that never needs to touch the network.
Scan unsigned data in, sign offline, and scan the signature back to broadcast.
Security design
Why the Ownbit cold wallet is safe to trust
Five properties you can check, not promises.
Your own phrase, or one from the OS
Import any BIP39 phrase, passphrase included. A new one is standard BIP39, 12 or 24 words, with entropy straight from the OS — and no Math.random fallback, so a missing secure source fails the generation rather than weakening it.
Offline from first second to last
The signing phone never joins Wi-Fi, mobile data or Bluetooth. Nothing can leak over a network it never touches — everything crosses as a QR code.
Your own phone, not someone’s hardware
An ordinary Android phone or iPhone you already own. No vendor secure element, no custom firmware, no extra chip that could copy a phrase out.
Every QR code is readable
Ownbit’s own encoding and the published standards other wallets speak — both plaintext and documented, so any code can be decoded and checked before you approve it.
Since 2017, zero security incidents
In production since 2017, never a security incident. The design never relied on secrecy: keys offline, codes readable, standard cryptography.
In the app
Sign offline. Broadcast online.
Transactions cross the gap as a QR code. No cable, no Wi-Fi, no Bluetooth.
Download Ownbit
Download
Download Ownbit for the setup you need
Install the app, explore secure mode, set up MultiSig, or build a Cold Wallet flow for higher-value storage.