dustCloudBackupFactory
fun dustCloudBackupFactory(factory: (address: String, dustSeed: ByteArray) -> DustCloudBackup): <Error class: unknown class>
Optional cross-device dust backup. The factory is invoked once during build with the derived address + dust seed (so the coordinator can derive its encryption key); the resulting DustCloudBackup is wired into both the dust-sync cold-start (restore) and the wallet (upload). Omit it (the default) and dust backup is simply absent.