The two-scan dance (node shows unsigned PSBT as animated QR, signer signs,
node scans the signed PSBT back, finalize + broadcast) is ~80% plumbed and 0%
usable. Verified gaps:
- No UI: lnd.create-psbt / lnd.finalize-psbt and their rpc-client.ts:417
wrappers are called by nothing but unit tests.
- No animated-QR encoder: qrcode/qrloop are deps and the inbound path
(useAnimatedQRDecoder + WalletScanModal) works, but nothing encodes a PSBT.
- Wrong format for real signers: qrloop is Ledger's; Passport/SeedSigner speak
BC-UR (ur:crypto-psbt), Coldcard Q speaks BBQr. BC-UR is the priority given
the existing Passport-Prime-compatible SeedQR work.
Gated on 10-05: create-psbt funds from LND's own wallet, so until LND is
watch-only against the external signer the offline device signs inputs whose
keys the node already holds.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
