From b0724348a1e556d1d2eebc04e3ebb8524eec2fd9 Mon Sep 17 00:00:00 2001
From: M <m@cakewallet.com>
Date: Fri, 23 Jul 2021 19:10:22 +0300
Subject: [PATCH] Added verification for unspent coins while transaction
 creation.

---
 lib/bitcoin/electrum_wallet.dart | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/bitcoin/electrum_wallet.dart b/lib/bitcoin/electrum_wallet.dart
index 78e3f6969..f86b04aa3 100644
--- a/lib/bitcoin/electrum_wallet.dart
+++ b/lib/bitcoin/electrum_wallet.dart
@@ -158,6 +158,9 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     const minAmount = 546;
     final transactionCredentials = credentials as BitcoinTransactionCredentials;
     final inputs = <BitcoinUnspent>[];
+    final credentialsAmount = transactionCredentials.amount != null
+      ? stringDoubleToBitcoinAmount(transactionCredentials.amount)
+      : 0;
     var allInputsAmount = 0;
 
     if (unspentCoins.isEmpty) {
@@ -171,7 +174,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       }
     }
 
-    if (inputs.isEmpty) {
+    if (inputs.isEmpty ||
+        (credentialsAmount > 0 && allInputsAmount < credentialsAmount)) {
       throw BitcoinTransactionNoInputsException();
     }
 
@@ -179,9 +183,6 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       feeAmountForPriority(transactionCredentials.priority, inputs.length, 1);
     final allAmount = allInputsAmount - allAmountFee;
 
-    final credentialsAmount = transactionCredentials.amount != null
-        ? stringDoubleToBitcoinAmount(transactionCredentials.amount)
-        : 0;
     final amount = transactionCredentials.amount == null ||
         allAmount - credentialsAmount < minAmount
         ? allAmount