bitcoindevkit · nymius · Jul 29, 2025 · Jul 19, 2025
diff --git a/silentpayments/src/lib.rs b/silentpayments/src/lib.rs
@@ -19,10 +19,14 @@ pub const NUMS_H: [u8; 32] = [
 
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum SpInputs {
-    P2TR,
-    P2WPKH,
-    WrappedSegwit,
-    P2PKH,
+    /// The input spends a P2TR output.
+    Tr,
+    /// The input spends a P2WPKH output.
+    Wpkh,
+    /// The input spends a P2WPKH output nested in a P2SH.
+    ShWpkh,
+    /// The inputs spends a P2PKH output.
+    Pkh,
 }
 
 pub fn tag_txin(txin: &TxIn, script_pubkey: &ScriptBuf) -> Option<SpInputs> {
@@ -35,12 +39,12 @@ pub fn tag_txin(txin: &TxIn, script_pubkey: &ScriptBuf) -> Option<SpInputs> {
             .redeem_script()
             .filter(|script_pubkey| script_pubkey.is_p2wpkh())
             // if not P2SH-P2WPKH return None
-            .map(|_| WrappedSegwit),
+            .map(|_| ShWpkh),
         // Native segwit
         (false, true) => {
             // P2WPKH
             if script_pubkey.is_p2wpkh() {
-                Some(P2WPKH)
+                Some(Wpkh)
             } else {
                 // P2TR
                 script_pubkey
@@ -50,13 +54,13 @@ pub fn tag_txin(txin: &TxIn, script_pubkey: &ScriptBuf) -> Option<SpInputs> {
                             .taproot_control_block()
                             .filter(|control_block| control_block[1..33] == NUMS_H)
                             // if P2TR has no internal key return None
-                            .map_or(Some(P2TR), |_| None)
+                            .map_or(Some(Tr), |_| None)
                     })
                     .flatten()
             }
         }
         // No witness, legacy P2PKH
-        (true, false) if script_pubkey.is_p2pkh() => Some(P2PKH),
+        (true, false) if script_pubkey.is_p2pkh() => Some(Pkh),
         // All other cases
         _ => None,
     }
@@ -167,7 +171,7 @@ mod tests {
 
             let tagged_input = tag_txin(&txin, &script_pubkey);
 
-            assert_eq!(Some(SpInputs::WrappedSegwit), tagged_input);
+            assert_eq!(Some(SpInputs::ShWpkh), tagged_input);
         }
 
         #[test]
@@ -219,7 +223,7 @@ mod tests {
 
             let tagged_input = tag_txin(&txin, &script_pubkey);
 
-            assert_eq!(Some(SpInputs::P2TR), tagged_input);
+            assert_eq!(Some(SpInputs::Tr), tagged_input);
         }
 
         #[test]
@@ -275,7 +279,7 @@ mod tests {
 
             let tagged_input = tag_txin(&txin, &script_pubkey);
 
-            assert_eq!(Some(SpInputs::P2WPKH), tagged_input);
+            assert_eq!(Some(SpInputs::Wpkh), tagged_input);
         }
 
         #[test]
@@ -324,7 +328,7 @@ mod tests {
 
             let tagged_input = tag_txin(&txin, &script_pubkey);
 
-            assert_eq!(Some(SpInputs::P2PKH), tagged_input);
+            assert_eq!(Some(SpInputs::Pkh), tagged_input);
         }
 
         #[test]

diff --git a/silentpayments/src/receive/mod.rs b/silentpayments/src/receive/mod.rs
@@ -52,17 +52,17 @@ pub fn extract_pubkey(txin: TxIn, script_pubkey: &ScriptBuf) -> Option<(SpInputs
     use SpInputs::*;
 
     tag_txin(&txin, script_pubkey).and_then(|tag| match tag {
-        WrappedSegwit | P2WPKH => {
+        ShWpkh | Wpkh => {
             let maybe_pk = txin.witness.last().expect("already checked is not empty");
             bitcoin::PublicKey::from_slice(maybe_pk)
                 .ok()
                 .filter(|pubkey| pubkey.compressed)
                 .map(|pk| (tag, pk.inner))
         }
-        P2TR => XOnlyPublicKey::from_slice(&script_pubkey.as_bytes()[2..34])
+        Tr => XOnlyPublicKey::from_slice(&script_pubkey.as_bytes()[2..34])
             .ok()
             .map(|xonly_pk| (tag, xonly_pk.public_key(Parity::Even))),
-        P2PKH => txin
+        Pkh => txin
             .script_sig
             .into_bytes()
             .windows(33)
@@ -300,7 +300,7 @@ mod tests {
 
             let (input_type, parsed_pubkey) = maybe_pubkey.expect("is some");
 
-            assert_eq!(SpInputs::WrappedSegwit, input_type);
+            assert_eq!(SpInputs::ShWpkh, input_type);
 
             assert_eq!(expected_pubkey, parsed_pubkey);
         }
@@ -335,7 +335,7 @@ mod tests {
 
             let (input_type, parsed_pubkey) = maybe_pubkey.expect("is some");
 
-            assert_eq!(SpInputs::P2WPKH, input_type);
+            assert_eq!(SpInputs::Wpkh, input_type);
 
             assert_eq!(expected_pubkey, parsed_pubkey);
         }
@@ -372,7 +372,7 @@ mod tests {
 
             let (input_type, parsed_pubkey) = maybe_pubkey.expect("is some");
 
-            assert_eq!(SpInputs::P2TR, input_type);
+            assert_eq!(SpInputs::Tr, input_type);
 
             assert_eq!(expected_pubkey, parsed_pubkey);
         }
@@ -405,7 +405,7 @@ mod tests {
 
             let (input_type, parsed_pubkey) = maybe_pubkey.expect("is some");
 
-            assert_eq!(SpInputs::P2PKH, input_type);
+            assert_eq!(SpInputs::Pkh, input_type);
 
             assert_eq!(expected_pubkey, parsed_pubkey);
         }
@@ -417,16 +417,16 @@ mod tests {
                     .expect("should succeed");
             // only input from mainnet tx 4316fe7be359937317f42ffaf05ab02554297fb83096a0beb985a25f9e338215
             let txin = TxIn {
-            previous_output: OutPoint {
-                txid: "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16"
-                    .parse()
-                    .unwrap(),
-                vout: 1,
-            },
-            script_sig: ScriptBuf::from_hex("0075473045022100a8c61b2d470e393279d1ba54f254b7c237de299580b7fa01ffcc940442ecec4502201afba952f4e4661c40acde7acc0341589031ba103a307b886eb867b23b850b972103782eeb913431ca6e9b8c2fd80a5f72ed2024ef72a3c6fb10263c379937323338").expect("should succeed"),
-            sequence: Sequence::MAX,
-            witness: Witness::new(),
-        };
+                previous_output: OutPoint {
+                    txid: "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16"
+                        .parse()
+                        .unwrap(),
+                    vout: 1,
+                },
+                script_sig: ScriptBuf::from_hex("0075473045022100a8c61b2d470e393279d1ba54f254b7c237de299580b7fa01ffcc940442ecec4502201afba952f4e4661c40acde7acc0341589031ba103a307b886eb867b23b850b972103782eeb913431ca6e9b8c2fd80a5f72ed2024ef72a3c6fb10263c379937323338").expect("should succeed"),
+                sequence: Sequence::MAX,
+                witness: Witness::new(),
+            };
 
             let expected_pubkey = PublicKey::from_str(
                 "03782eeb913431ca6e9b8c2fd80a5f72ed2024ef72a3c6fb10263c379937323338",
@@ -439,7 +439,7 @@ mod tests {
 
             let (input_type, parsed_pubkey) = maybe_pubkey.expect("is some");
 
-            assert_eq!(SpInputs::P2PKH, input_type);
+            assert_eq!(SpInputs::Pkh, input_type);
 
             assert_eq!(expected_pubkey, parsed_pubkey);
         }

diff --git a/silentpayments/src/send/psbt/mod.rs b/silentpayments/src/send/psbt/mod.rs
@@ -235,7 +235,7 @@ where
 
         let maybe_secret_key = extract_pubkey(full_txin.clone(), &prevout)
             .map(|pubkey_data| match pubkey_data {
-                (SpInputs::P2TR, even_tr_output_key) => {
+                (SpInputs::Tr, even_tr_output_key) => {
                     match get_taproot_secret(psbt_input, k, secp) {
                         Ok(Some(secret)) => {
                             let (xonly, _) = secret.x_only_public_key(secp);