To prove you control a wallet, you sign a short message with its private key. Your hardware wallet does the signing. The key never leaves the device.Signing a message is not a transaction:
Nothing is sent to the Bitcoin network.
No fees are paid.
No Bitcoin moves.
The private key is not revealed.
Always read what your device asks you to approve. A real ownership message is a sentence of text. If your device shows an amount and a destination address, that’s a transaction. Reject it.
Find your xpub or sign in your wallet app
Step-by-step guides for Sparrow, BlueWallet, Blockstream (Jade), and Nunchuk:
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