call electrumx mn collat call

lib/electrumx_rpc/electrumx_client.dart

@@ -1142,6 +1142,38 @@ class ElectrumXClient {
   }
   // ===========================================================================
 
+  Future<bool> isMasterNodeCollateral({
+    String? requestID,
+    required String txid,
+    required int index,
+  }) async {
+    try {
+      final start = DateTime.now();
+      final response = await request(
+        requestID: requestID,
+        command: "blockchain.checkifmncollateral",
+        args: [
+          txid,
+          index.toString(),
+        ],
+      );
+
+      Logging.instance.log(
+        "Finished ElectrumXClient.isMasterNodeCollateral, "
+        "response: $response, "
+        "Duration=${DateTime.now().difference(start)}",
+        level: LogLevel.Info,
+      );
+
+      return response as bool? ?? false;
+    } catch (e) {
+      Logging.instance.log(e, level: LogLevel.Error);
+      rethrow;
+    }
+  }
+
+  // ===========================================================================
+
   /// Get the current fee rate.
   ///
   /// Returns a map with the kay "rate" that corresponds to the free rate in satoshis

lib/wallets/wallet/impl/firo_wallet.dart

@@ -631,9 +631,16 @@ class FiroWallet<T extends ElectrumXCurrencyInterface> extends Bip39HDWallet<T>
           BigInt.from(jsonUTXO["value"] as int);
 
       if (blocked) {
-        blockedReason = "Possible masternode output. "
+        blocked = await electrumXClient.isMasterNodeCollateral(
+          txid: jsonTX!["txid"] as String,
+          index: jsonUTXO["tx_pos"] as int,
+        );
+      }
+
+      if (blocked) {
+        blockedReason = "Masternode collateral. "
             "Unlock and spend at your own risk.";
-        label = "Possible masternode";
+        label = "Masternode collateral";
       }
     }