bitcoin-hardware-passport
Foundation Passport: QR-only airgap HW wallet. No USB connectivity for signing. Camera + microSD only. Open-source firmware. USE WHEN: integrating Passport, designing strict airgap flows.
What this skill does
# Foundation Passport Airgapped Bitcoin hardware wallet. Distinguishing feature: **NO USB data port** for signing. All comms via QR codes + microSD. ## Models - **Passport Founder's Edition** (2021): touchscreen, smaller form. - **Passport Batch 2** (2022+): updated firmware. - **Passport Core** (2024+): improved hardware. ## Operation - Wallet generates PSBT on phone/computer. - User displays PSBT as **animated QR** on screen. - Passport reads QR via camera. - Passport displays signed PSBT as animated QR. - Wallet reads it back. For larger PSBTs: SD card transport. ## Backup - 24-word BIP39 seed. - Optional 25th-word passphrase. - microSD encrypted backup. ## Open-source Fully open: firmware, hardware schematics. Audit-friendly. ## Compatible wallets Wallets supporting BCUR / animated QR airgap: - Sparrow (excellent integration). - Specter Desktop. - Nunchuk. - BlueWallet (limited). - Foundation Envoy (mobile companion app). ## Compared | Aspect | Passport | Coldcard Q | SeedSigner | |--------|----------|------------|------------| | Airgap method | QR + microSD only | QR / microSD / NFC | QR only | | USB | None | USB-C | None (DIY) | | Display | Touchscreen | Touchscreen | Small (DIY) | | Build | Polished commercial | Polished | DIY hardware | | Price | High | High | Low (DIY parts) | ## Common issues - **QR scan failures** — large PSBTs slow to transmit; use SD card for big multi-input txs. - **Microsd FAT32 only**. - **Passphrase**: separate from seed; easy to lose. ## See also - [coldcard/SKILL.md](../coldcard/SKILL.md) - [seedsigner/SKILL.md](../seedsigner/SKILL.md) - [jade/SKILL.md](../jade/SKILL.md) - [psbt-flows/SKILL.md](../psbt-flows/SKILL.md)
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