When you first initiate the Theta wallet, you’ll be asked to set up a mnemonic phrase to secure your wallet. This will also serve as the key to restore your Theta wallet in case you lose your device, or need to move your Theta wallet to a new device. This feature allows you to effectively keep your Theta Tokens in cold storage. After storing your tokens in the Theta wallet, and making 100% sure you have safely recorded your mnemonic phrase, you are not required to keep the Theta wallet installed. As long as you maintain access to that mnemonic phrase, you can at any time re-install the wallet on any supported device and your tokens will be safely held at the same Theta address you previously stored them at. Of course, that’s not always convenient to install the wallet each time you want to move tokens. But if security is paramount, it is a secure way to store your tokens offline until we are able to integrate Ledger/Trezor hardware wallet support for the Theta blockchain.