Stellar makes offline signing feel native.
SEP-7 gives a Stellar transaction a clean QR-shaped request format. Better Wallet Pi uses that to keep signing offline without hiding the handoff from the person approving it.
The strongest part of Stellar support is that the transaction can arrive as a readable, standards-based request instead of a private companion-app message. A web+stellar URI can carry the XDR to the offline device, and the device can return a signed envelope XDR for broadcast elsewhere.
That shape is unusually friendly to an air-gapped wallet. The online computer prepares and later submits. The Pi scans, parses, displays, waits for a physical decision, signs, and shows the result. The boundary stays visible the whole time.
Better Wallet Pi still treats this as a prototype. The goal is not to claim a finished consumer product. The goal is to demonstrate a small, auditable signing loop where Stellar is a first-class path, not a side quest hidden behind an EVM-only architecture.