fixup! Use KeyObfuscator in VssStore.

src/io/vss_store.rs

@@ -47,7 +47,11 @@ pub struct VssStore {
 	storable_builder: StorableBuilder<RandEntropySource>,
 	key_obfuscator: KeyObfuscator,
 }
+
+// Used to derive `data_encryption_key` from `vss_seed`, which is then used by the `StorableBuilder`.
 const DATA_ENCRYPTION_KEY_DERIVATION_INDEX: u32 = 1;
+
+// Used to derive `obfuscation_master_key` from `vss_seed`, which is then used by the `KeyObfuscator`.
 const OBFUSCATION_KEY_DERIVATION_INDEX: u32 = 2;
 
 impl VssStore {
@@ -56,7 +60,11 @@ impl VssStore {
 		header_provider: Arc<dyn VssHeaderProvider>,
 	) -> io::Result<Self> {
 		let runtime = tokio::runtime::Builder::new_multi_thread().enable_all().build()?;
-		let vss_master_xprv = Xpriv::new_master(Network::Bitcoin, &vss_seed).unwrap();
+		// The selected bitcoin network doesn't matter here.
+		let vss_master_xprv = Xpriv::new_master(Network::Bitcoin, &vss_seed).map_err(|e| {
+			let msg = format!("Failed to create Vss master key, error: {}", e);
+			io::Error::new(ErrorKind::Other, msg)
+		})?;
 		let data_encryption_key =
 			derive_hardened_key(&vss_master_xprv, DATA_ENCRYPTION_KEY_DERIVATION_INDEX)?;
 		let obfuscation_master_key =