From 1a9f3ba9a4f095461cafe6c32742cc69ffadfa88 Mon Sep 17 00:00:00 2001
From: roman <roman@osmosis.team>
Date: Fri, 10 Apr 2026 10:54:19 -0600
Subject: [PATCH] pczt: Add public getters for spend_auth_sig and
 shielded_sighash

These getters enable downstream consumers to read the Orchard spend
authorization signature from a PCZT after signing, and to access the
cached shielded sighash from the Signer role for external verification.

Made-with: Cursor
---
 pczt/CHANGELOG.md            | 4 ++++
 pczt/src/orchard.rs          | 1 +
 pczt/src/roles/signer/mod.rs | 5 +++++
 3 files changed, 10 insertions(+)

diff --git a/pczt/CHANGELOG.md b/pczt/CHANGELOG.md
index c49193adca..e9c5e40c6c 100644
--- a/pczt/CHANGELOG.md
+++ b/pczt/CHANGELOG.md
@@ -10,6 +10,10 @@ workspace.
 
 ## [Unreleased]
 
+### Added
+- `pczt::orchard::Spend::spend_auth_sig` getter (via `getset`).
+- `pczt::roles::signer::Signer::shielded_sighash` getter.
+
 ## [0.4.1, 0.5.1] - 2026-02-26
 
 ### Fixed
diff --git a/pczt/src/orchard.rs b/pczt/src/orchard.rs
index ebe4cd7c73..0a9cc8fa5b 100644
--- a/pczt/src/orchard.rs
+++ b/pczt/src/orchard.rs
@@ -111,6 +111,7 @@ pub struct Spend {
     ///
     /// This is set by the Signer.
     #[serde_as(as = "Option<[_; 64]>")]
+    #[getset(get = "pub")]
     pub(crate) spend_auth_sig: Option<[u8; 64]>,
 
     /// The [raw encoding] of the Orchard payment address that received the note being spent.
diff --git a/pczt/src/roles/signer/mod.rs b/pczt/src/roles/signer/mod.rs
index 7fcd603ec3..98188f132c 100644
--- a/pczt/src/roles/signer/mod.rs
+++ b/pczt/src/roles/signer/mod.rs
@@ -95,6 +95,11 @@ impl Signer {
         })
     }
 
+    /// Returns the cached shielded (Orchard + Sapling) sighash.
+    pub fn shielded_sighash(&self) -> [u8; 32] {
+        self.shielded_sighash
+    }
+
     /// Signs the transparent spend at the given index with the given spending key.
     ///
     /// It is the caller's responsibility to perform any semantic validity checks on the