Pre-ZIP: Hardware-wallet App Storage Keys (encrypting a light wallet's data with a key from the signer)

ZIP: Unassigned Title: Hardware-Wallet App Storage Keys Owners: 0xOucan Status: Draft Community Status: Request for comments Category: Standards / Wallet License: MIT Hi all, this is a pre-ZIP, posted here to check the idea before it goes to the ZIP editors. It came out of building the LeekWallet Zcash SDK, but it’s meant for any hardware signer and any wallet app. Full draft (key tree, rationale, test vectors): ZIP draft: Hardware-Wallet App Storage Keys | LeekWallet Zcash docs Source: docs/zcash/zip-draft-app-storage-keys.md in GitHub - 0xOucan/leekwallet-zcash: DIY Zcash hardware wallet on ESP32-S3: PCZT signer for Ironwood/Orchard, USB/BLE/QR/SD, with Android and CLI companions · GitHub (branch zecathon ) Reference implementation: the LeekWallet firmware ( zGetStorageKey ) and the leek-zcash SDK. Both reproduce the draft’s four test vectors. A 60-second explainer video: https://youtu.be/F-YRyLxuLzI Abstract A wallet app that uses a hardware wallet can keep its data (the UFVK and the wallet database) encryp