diff --git a/src/neo/SmartContract/ApplicationEngine.Binary.cs b/src/neo/SmartContract/ApplicationEngine.Binary.cs
index 17a41f1072..1dd240efdb 100644
--- a/src/neo/SmartContract/ApplicationEngine.Binary.cs
+++ b/src/neo/SmartContract/ApplicationEngine.Binary.cs
@@ -1,4 +1,5 @@
 using Neo.VM.Types;
+using static System.Convert;
 
 namespace Neo.SmartContract
 {
@@ -6,6 +7,8 @@ partial class ApplicationEngine
     {
         public static readonly InteropDescriptor System_Binary_Serialize = Register("System.Binary.Serialize", nameof(BinarySerialize), 0_00100000, TriggerType.All, CallFlags.None, true);
         public static readonly InteropDescriptor System_Binary_Deserialize = Register("System.Binary.Deserialize", nameof(BinaryDeserialize), 0_00500000, TriggerType.All, CallFlags.None, true);
+        public static readonly InteropDescriptor System_Binary_Base64Encode = Register("System.Binary.Base64Encode", nameof(Base64Encode), 0_00100000, TriggerType.All, CallFlags.None, true);
+        public static readonly InteropDescriptor System_Binary_Base64Decode = Register("System.Binary.Base64Decode", nameof(Base64Decode), 0_00100000, TriggerType.All, CallFlags.None, true);
 
         internal byte[] BinarySerialize(StackItem item)
         {
@@ -16,5 +19,15 @@ internal StackItem BinaryDeserialize(byte[] data)
         {
             return BinarySerializer.Deserialize(data, MaxStackSize, MaxItemSize, ReferenceCounter);
         }
+
+        internal string Base64Encode(byte[] data)
+        {
+            return ToBase64String(data);
+        }
+
+        internal byte[] Base64Decode(string s)
+        {
+            return FromBase64String(s);
+        }
     }
 }