From 102139b0611dc3dceffedea26085eaef89ac31f4 Mon Sep 17 00:00:00 2001
From: Rafael <github@rafael.saes.dev>
Date: Thu, 15 Aug 2024 22:34:41 -0300
Subject: [PATCH] feat: more info on privkey error (#1612)

---
 cw_bitcoin/lib/electrum_wallet.dart | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/cw_bitcoin/lib/electrum_wallet.dart b/cw_bitcoin/lib/electrum_wallet.dart
index 501d94e54..9dc8de083 100644
--- a/cw_bitcoin/lib/electrum_wallet.dart
+++ b/cw_bitcoin/lib/electrum_wallet.dart
@@ -993,11 +993,29 @@ abstract class ElectrumWalletBase
       bool hasTaprootInputs = false;
 
       final transaction = txb.buildTransaction((txDigest, utxo, publicKey, sighash) {
-        final key = estimatedTx.inputPrivKeyInfos
-            .firstWhereOrNull((element) => element.privkey.getPublic().toHex() == publicKey);
+        String error = "Cannot find private key.";
+
+        ECPrivateInfo? key;
+
+        if (estimatedTx.inputPrivKeyInfos.isEmpty) {
+          error += "\nNo private keys generated.";
+        } else {
+          error += "\nAddress: ${utxo.ownerDetails.address.toAddress()}";
+
+          key = estimatedTx.inputPrivKeyInfos.firstWhereOrNull((element) {
+            final elemPubkey = element.privkey.getPublic().toHex();
+            if (elemPubkey == publicKey) {
+              return true;
+            } else {
+              error += "\nExpected: $publicKey";
+              error += "\nPubkey: $elemPubkey";
+              return false;
+            }
+          });
+        }
 
         if (key == null) {
-          throw Exception("Cannot find private key");
+          throw Exception(error);
         }
 
         if (utxo.utxo.isP2tr()) {