diff --git a/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt b/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt
index 458f4bfa..232e8ee7 100644
--- a/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt
+++ b/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt
@@ -1244,10 +1244,12 @@ class MainViewModel @Inject constructor(
                 onSuccess = { result ->
                     android.util.Log.d("MainViewModel", "[SIGN] Signature received: ${result.signature.take(20)}...")
                     _signature.value = result.signature
+                    // IMPORTANT: Reset isLoading so broadcast button is enabled
+                    _uiState.update { it.copy(isLoading = false) }
                 },
                 onFailure = { e ->
                     android.util.Log.e("MainViewModel", "[SIGN] waitForSignature FAILED: ${e.message}")
-                    _uiState.update { it.copy(error = e.message) }
+                    _uiState.update { it.copy(isLoading = false, error = e.message) }
                 }
             )
         }
@@ -1257,26 +1259,37 @@ class MainViewModel @Inject constructor(
      * Broadcast the signed transaction
      */
     fun broadcastTransaction() {
+        android.util.Log.d("MainViewModel", "[BROADCAST] broadcastTransaction() called")
         viewModelScope.launch {
+            android.util.Log.d("MainViewModel", "[BROADCAST] Starting broadcast...")
             _uiState.update { it.copy(isLoading = true, error = null) }
 
             val tx = _preparedTx.value
             val sig = _signature.value
 
+            android.util.Log.d("MainViewModel", "[BROADCAST] preparedTx: ${tx?.let { "present" } ?: "null"}")
+            android.util.Log.d("MainViewModel", "[BROADCAST] signature: ${sig?.let { "${it.take(20)}..." } ?: "null"}")
+
             if (tx == null || sig == null) {
+                android.util.Log.e("MainViewModel", "[BROADCAST] Missing tx or signature! tx=$tx, sig=$sig")
                 _uiState.update { it.copy(isLoading = false, error = "交易或签名缺失") }
                 return@launch
             }
 
             val rpcUrl = _settings.value.kavaRpcUrl
+            android.util.Log.d("MainViewModel", "[BROADCAST] Using RPC URL: $rpcUrl")
             val result = repository.broadcastTransaction(tx, sig, rpcUrl)
 
+            android.util.Log.d("MainViewModel", "[BROADCAST] repository.broadcastTransaction returned: isSuccess=${result.isSuccess}")
+
             result.fold(
                 onSuccess = { hash ->
+                    android.util.Log.d("MainViewModel", "[BROADCAST] SUCCESS! txHash=$hash")
                     _txHash.value = hash
                     _uiState.update { it.copy(isLoading = false, successMessage = "交易已广播!") }
                 },
                 onFailure = { e ->
+                    android.util.Log.e("MainViewModel", "[BROADCAST] FAILED: ${e.message}", e)
                     _uiState.update { it.copy(isLoading = false, error = e.message) }
                 }
             )