DOT: Building a True Air-Gapped Solana Vault on an Ordinary Phone
DOT is an offline-first, client-side cryptographic vault designed for Solana. It derives Ed25519 keys entirely inside your browser’s sandbox using the Web Crypto API, so private keys never leave the device. Backups take the form of a zero-knowledge encrypted file (.dot1) sealed with either a WebAuthn biometric passkey or a high-entropy Argon2id passphrase. Transactions are signed offline and transferred solely through multi-frame animated QR codes in the UR/BC-UR format. There is no Wi-Fi, Bluetooth, NFC, or any other radio path—only physical isolation.
The practical way to use it is with a dedicated spare phone that becomes a permanent cold vault.
Start by factory-resetting any spare Android or iPhone. Skip all cloud account restorations. Disable Bluetooth, NFC, AirDrop or Nearby Share, cellular data, and remove the SIM card entirely. Set a strong device passcode and enable biometrics. Connect to Wi-Fi only long enough to open the DOT web app in Safari or Chrome and install it as a Progressive Web App (Add to Home Screen on iOS, or the equivalent Install/Add option on Android). Once launched from the home screen, the service worker caches the entire application, including its WebAssembly and cryptographic components, so it can run completely offline thereafter.
From that point forward the phone stays in Airplane Mode with Wi-Fi forgotten and disabled. DOT continues to launch instantly from its local cache.
On the air-gapped phone, create a new sovereign vault. Generate a 12- or 24-word recovery phrase, then stamp or engrave it onto steel or paper—never photograph or type it into any connected device. Set a vault password or bind local biometrics, and export the .dot1 envelope to an offline microSD card or cold flash drive as a secondary backup.
🔗 https://dot-eight-gilt.vercel.app
DOTDot Vault
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