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Encrypt descriptor backups to their public recipient keys with a seed-derived approval mark. Recover binary or base64 backups using origin hints and common paths, with bounded work and a cache scoped to the recovery session.
Store binary backups on flash and base64 backups on SD. Restore only approved backups that pass keyed validation, deduplicate entries, and protect existing files in both persistence APIs. Bound storage reads and scanning work, run recovery at idle priority without changing watchdog subscriptions, and remove the selected persisted entry. Automatic scans reuse mounted SD storage without probing empty slots; brief scans do not flash a progress dialog.
The Descriptor Loaded page now asks whether to keep the descriptor for this session or register it on flash or SD card under a chosen name. Registering promotes the session entry in place.
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This PR is part of a parallel work with #167 (Rust based implementation of BIP138 and Miniscript QR code protocol)
BIP138 is a WIP proposal to standardize encrypted descriptors' registration, where data can be decrypted and loaded using any of the public keys which are part of the wallet descriptor.
A pure C implementation of BIP138 was created, focusing resources reuse in embedded devices, especially the ESP32, paired with PSA crypto.
The goal now is to keep both Rust and C development fronts being compared and cross-tested as a support for BIP138 itself and the advanced Miniscript code QR protocol, part of BWK development