Use the zip32::Scope type

CHANGELOG.md

@@ -26,7 +26,7 @@ and this project adheres to Rust's notion of
 ### Changed
 - Migrated to the `zip32` crate. The following types have been replaced by the
   equivalent ones in that crate are now re-exported from there:
-  - `orchard::keys::DiversifierIndex`
+  - `orchard::keys::{DiversifierIndex, Scope}`
   - `orchard::zip32::ChildIndex`
 - `orchard::builder`:
   - `Builder::new` now takes the bundle type to be used in bundle construction,

src/keys.rs

@@ -27,7 +27,7 @@ use crate::{
     zip32::{self, ExtendedSpendingKey},
 };
 
-pub use ::zip32::DiversifierIndex;
+pub use ::zip32::{DiversifierIndex, Scope};
 
 const KDF_ORCHARD_PERSONALIZATION: &[u8; 16] = b"Zcash_OrchardKDF";
 const ZIP32_PURPOSE: u32 = 32;
@@ -288,24 +288,6 @@ impl CommitIvkRandomness {
     }
 }
 
-/// The scope of a viewing key or address.
-///
-/// A "scope" narrows the visibility or usage to a level below "full".
-///
-/// Consistent usage of `Scope` enables the user to provide consistent views over a wallet
-/// to other people. For example, a user can give an external [`IncomingViewingKey`] to a
-/// merchant terminal, enabling it to only detect "real" transactions from customers and
-/// not internal transactions from the wallet.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub enum Scope {
-    /// A scope used for wallet-external operations, namely deriving addresses to give to
-    /// other users in order to receive funds.
-    External,
-    /// A scope used for wallet-internal operations, such as creating change notes,
-    /// auto-shielding, and note management.
-    Internal,
-}
-
 /// A key that provides the capability to view incoming and outgoing transactions.
 ///
 /// This key is useful anywhere you need to maintain accurate balance, but do not want the