From a3a252fe87ffeb95cd0ce8c92b40eafd51573ad9 Mon Sep 17 00:00:00 2001
From: Dzmitry Shuysky <errfrom@yandex.ru>
Date: Thu, 26 Sep 2024 17:39:30 +0200
Subject: [PATCH 1/2] Fix transaction witness set 'attach' functions

---
 src/Internal/Transaction.purs | 43 +++++++++++++----------------------
 1 file changed, 16 insertions(+), 27 deletions(-)

diff --git a/src/Internal/Transaction.purs b/src/Internal/Transaction.purs
index e01acd09bc..d9f331aa49 100644
--- a/src/Internal/Transaction.purs
+++ b/src/Internal/Transaction.purs
@@ -90,43 +90,32 @@ setScriptDataHash costModels rs ds tx@(Transaction { body, witnessSet })
 attachDatum :: PlutusData -> Transaction -> Transaction
 attachDatum d = attachDatums [ d ]
 
-attachDatums
-  :: Array PlutusData -> Transaction -> Transaction
+attachDatums :: Array PlutusData -> Transaction -> Transaction
 attachDatums [] tx = tx
 attachDatums datums tx@(Transaction { witnessSet: TransactionWitnessSet ws }) =
-  do
-    updateTxWithWitnesses tx $ TransactionWitnessSet $ ws
-      { plutusData = nub $ ws.plutusData <> datums }
+  updateTxWithWitnesses tx $ TransactionWitnessSet $ ws
+    { plutusData = nub $ ws.plutusData <> datums
+    }
 
 -- | Attach a `PlutusScript` to a transaction by modifying its existing witness
 -- | set
-attachPlutusScript
-  :: PlutusScript -> Transaction -> Transaction
+attachPlutusScript :: PlutusScript -> Transaction -> Transaction
 attachPlutusScript ps = attachPlutusScripts [ ps ]
 
-attachPlutusScripts
-  :: Array PlutusScript
-  -> Transaction
-  -> Transaction
+attachPlutusScripts :: Array PlutusScript -> Transaction -> Transaction
 attachPlutusScripts ps tx@(Transaction { witnessSet: TransactionWitnessSet ws }) =
-  do
-    updateTxWithWitnesses tx
-      $ TransactionWitnessSet
-      $ ws { plutusScripts = nub $ ws.plutusScripts <> ps }
+  updateTxWithWitnesses tx $ TransactionWitnessSet $ ws
+    { plutusScripts = nub $ ws.plutusScripts <> ps
+    }
 
 -- | Attach a `NativeScript` to a transaction by modifying its existing witness
 -- | set
-attachNativeScript
-  :: NativeScript -> Transaction -> Transaction
+attachNativeScript :: NativeScript -> Transaction -> Transaction
 attachNativeScript ns tx@(Transaction { witnessSet: TransactionWitnessSet ws }) =
-  do
-    updateTxWithWitnesses tx
-      $ TransactionWitnessSet
-      $ ws { nativeScripts = nub $ ws.nativeScripts <> [ ns ] }
+  updateTxWithWitnesses tx $ TransactionWitnessSet $ ws
+    { nativeScripts = nub $ ws.nativeScripts <> [ ns ]
+    }
 
-updateTxWithWitnesses
-  :: Transaction
-  -> TransactionWitnessSet
-  -> Transaction
-updateTxWithWitnesses tx@(Transaction t) ws =
-  over Transaction _ { witnessSet = t.witnessSet <> ws } tx
+updateTxWithWitnesses :: Transaction -> TransactionWitnessSet -> Transaction
+updateTxWithWitnesses tx ws =
+  over Transaction _ { witnessSet = ws } tx

From 16c6b8822f58c50bb7692c889cea05c6f1885f5c Mon Sep 17 00:00:00 2001
From: Dzmitry Shuysky <errfrom@yandex.ru>
Date: Thu, 26 Sep 2024 17:51:58 +0200
Subject: [PATCH 2/2] Update CHANGELOG.md

---
 CHANGELOG.md | 42 +++++++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b0c018e17..c10b16eccc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,82 +7,90 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 
-- [[v9.3.1]](#v931)
+- [[Unreleased]](#unreleased)
   - [Fixed](#fixed)
-- [[v9.3.0]](#v930)
+- [[v9.3.1]](#v931)
   - [Fixed](#fixed-1)
+- [[v9.3.0]](#v930)
+  - [Fixed](#fixed-2)
   - [Changed](#changed)
 - [[v9.2.0]](#v920)
   - [Added](#added)
   - [Changed](#changed-1)
   - [Removed](#removed)
-  - [Fixed](#fixed-2)
+  - [Fixed](#fixed-3)
 - [[v9.1.0]](#v910)
   - [Added](#added-1)
-  - [Changed](#changed-2
+  - [Changed](#changed-2)
   - [Removed](#removed-1)
-  - [Fixed](#fixed-3)
+  - [Fixed](#fixed-4)
 - [[v9.0.0]](#v900)
   - [Deprecated](#deprecated)
   - [Added](#added-2)
   - [Removed](#removed-2)
   - [Changed](#changed-3)
-  - [Fixed](#fixed-4)
+  - [Fixed](#fixed-5)
 - [[v8.0.0]](#v800)
   - [Added](#added-3)
   - [Changed](#changed-4)
-  - [Fixed](#fixed-5)
+  - [Fixed](#fixed-6)
   - [Removed](#removed-3)
 - [[v7.0.0]](#v700)
   - [Added](#added-4)
   - [Changed](#changed-5)
-  - [Fixed](#fixed-6)
+  - [Fixed](#fixed-7)
   - [Removed](#removed-4)
 - [[v6.0.0]](#v600)
   - [Added](#added-5)
   - [Changed](#changed-6)
-  - [Fixed](#fixed-7)
+  - [Fixed](#fixed-8)
   - [Removed](#removed-5)
 - [[v5.0.0]](#v500)
   - [Added](#added-6)
   - [Changed](#changed-7)
   - [Removed](#removed-6)
-  - [Fixed](#fixed-8)
+  - [Fixed](#fixed-9)
   - [Runtime Dependencies](#runtime-dependencies)
 - [[v4.0.2] - 2023-01-17](#v402---2023-01-17)
-  - [Fixed](#fixed-9)
+  - [Fixed](#fixed-10)
 - [[v4.0.1] - 2022-12-20](#v401---2022-12-20)
   - [Added](#added-7)
 - [[v4.0.0] - 2022-12-15](#v400---2022-12-15)
   - [Added](#added-8)
   - [Changed](#changed-8)
   - [Removed](#removed-7)
-  - [Fixed](#fixed-10)
+  - [Fixed](#fixed-11)
   - [Runtime Dependencies](#runtime-dependencies-1)
 - [[3.0.0] - 2022-11-21](#300---2022-11-21)
   - [Added](#added-9)
   - [Changed](#changed-9)
   - [Removed](#removed-8)
-  - [Fixed](#fixed-11)
+  - [Fixed](#fixed-12)
   - [Runtime Dependencies](#runtime-dependencies-2)
 - [[2.0.0] - 2022-09-12](#200---2022-09-12)
   - [Added](#added-10)
   - [Changed](#changed-10)
   - [Removed](#removed-9)
-  - [Fixed](#fixed-12)
+  - [Fixed](#fixed-13)
 - [[2.0.0-alpha] - 2022-07-05](#200-alpha---2022-07-05)
   - [Added](#added-11)
   - [Removed](#removed-10)
   - [Changed](#changed-11)
-  - [Fixed](#fixed-13)
-- [[1.1.0] - 2022-06-30](#110---2022-06-30)
   - [Fixed](#fixed-14)
-- [[1.0.1] - 2022-06-17](#101---2022-06-17)
+- [[1.1.0] - 2022-06-30](#110---2022-06-30)
   - [Fixed](#fixed-15)
+- [[1.0.1] - 2022-06-17](#101---2022-06-17)
+  - [Fixed](#fixed-16)
 - [[1.0.0] - 2022-06-10](#100---2022-06-10)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed transaction witness set 'attach' functions. Previously, the updated witness set was incorrectly appended to the existing set, causing performance degradation when processing constraints for complex transactions. ([#1653](https://github.com/Plutonomicon/cardano-transaction-lib/pull/1653))
+
 ## [v9.3.1]
 
 ### Fixed