Air-gapped wallet
A signing setup disconnected from networks that exchanges transaction data through a separate transfer method.
In more detail
An air-gapped signer needs no direct network link to authorize a transaction. Another device prepares the request, and a QR code or removable storage moves the data across. The signed result returns for broadcasting. Those transfer methods still require trustworthy software and checks of the requested transaction.
How you might use it
The offline signer receives your unsigned PSBT through removable storage and returns a signed file for the connected device to broadcast.
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