diff --git a/src/AntShares/AntShares.csproj b/src/AntShares/AntShares.csproj
index a82f2a9612..1aa5c29e8b 100644
--- a/src/AntShares/AntShares.csproj
+++ b/src/AntShares/AntShares.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Copyright>2015-2017 The Antshares team</Copyright>
     <AssemblyTitle>AntShares</AssemblyTitle>
-    <VersionPrefix>1.6.1</VersionPrefix>
+    <Version>1.6.2</Version>
     <Authors>The Antshares team</Authors>
     <TargetFrameworks>netstandard1.6;net461</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
diff --git a/src/AntShares/Core/Blockchain.cs b/src/AntShares/Core/Blockchain.cs
index 5c9a908b4a..f67b639efe 100644
--- a/src/AntShares/Core/Blockchain.cs
+++ b/src/AntShares/Core/Blockchain.cs
@@ -386,6 +386,8 @@ byte[] IScriptTable.GetScript(byte[] script_hash)
             return GetContract(new UInt160(script_hash)).Code.Script;
         }
 
+        public abstract StorageItem GetStorageItem(StorageKey key);
+
         /// <summary>
         /// 根据指定的区块高度，返回对应区块及之前所有区块中包含的系统费用的总量
         /// </summary>
diff --git a/src/AntShares/Core/TransactionType.cs b/src/AntShares/Core/TransactionType.cs
index 49a32bccaa..4c6eea4941 100644
--- a/src/AntShares/Core/TransactionType.cs
+++ b/src/AntShares/Core/TransactionType.cs
@@ -30,10 +30,6 @@ public enum TransactionType : byte
         /// </summary>
         ContractTransaction = 0x80,
         /// <summary>
-        /// 委托交易
-        /// </summary>
-        AgencyTransaction = 0xb0,
-        /// <summary>
         /// Publish scripts to the blockchain for being invoked later.
         /// </summary>
         PublishTransaction = 0xd0,
diff --git a/src/AntShares/IO/Caching/DataCache.cs b/src/AntShares/IO/Caching/DataCache.cs
index 9d5323d2ac..5262157c02 100644
--- a/src/AntShares/IO/Caching/DataCache.cs
+++ b/src/AntShares/IO/Caching/DataCache.cs
@@ -8,7 +8,7 @@ public abstract class DataCache<TKey, TValue>
         where TKey : IEquatable<TKey>, ISerializable
         where TValue : class, ISerializable, new()
     {
-        protected class Trackable
+        protected internal class Trackable
         {
             public TKey Key;
             public TValue Item;
@@ -73,7 +73,7 @@ public void DeleteWhere(Func<TKey, TValue, bool> predicate)
                 trackable.State = TrackState.Deleted;
         }
 
-        protected IEnumerable<Trackable> GetChangeSet()
+        protected internal IEnumerable<Trackable> GetChangeSet()
         {
             return dictionary.Values.Where(p => p.State != TrackState.None);
         }
diff --git a/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs b/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs
index df5a7234c4..6944abac2f 100644
--- a/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs
+++ b/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs
@@ -2,6 +2,7 @@
 using AntShares.Cryptography;
 using AntShares.Cryptography.ECC;
 using AntShares.IO;
+using AntShares.IO.Caching;
 using AntShares.SmartContract;
 using System;
 using System.Collections.Generic;
@@ -274,6 +275,11 @@ public override UInt256 GetNextBlockHash(UInt256 hash)
             }
         }
 
+        public override StorageItem GetStorageItem(StorageKey key)
+        {
+            return db.TryGet<StorageItem>(ReadOptions.Default, DataEntryPrefix.ST_Storage, key);
+        }
+
         public override long GetSysFeeAmount(UInt256 hash)
         {
             Slice value;
@@ -547,8 +553,14 @@ private void Persist(Block block)
             spentcoins.Commit(batch);
             validators.Commit(batch);
             assets.Commit(batch);
+            HashSet<UInt160> contracts_deleted = new HashSet<UInt160>(contracts.GetChangeSet().Where(p => p.State == TrackState.Deleted).Select(p => p.Key));
             contracts.Commit(batch);
+            if (contracts_deleted.Count > 0)
+                storages.DeleteWhere((k, v) => contracts_deleted.Contains(k.ScriptHash));
             storages.Commit(batch);
+            foreach (UInt160 script_hash in contracts_deleted)
+                foreach (Slice key in db.Find(ReadOptions.Default, SliceBuilder.Begin(DataEntryPrefix.ST_Storage).Add(script_hash), (k, v) => k))
+                    batch.Delete(key);
             batch.Put(SliceBuilder.Begin(DataEntryPrefix.SYS_CurrentBlock), SliceBuilder.Begin().Add(block.Hash).Add(block.Index));
             db.Write(WriteOptions.Default, batch);
             current_block_height = block.Index;
diff --git a/src/AntShares/Network/RPC/RpcServer.cs b/src/AntShares/Network/RPC/RpcServer.cs
index a8466e744d..b2578524de 100644
--- a/src/AntShares/Network/RPC/RpcServer.cs
+++ b/src/AntShares/Network/RPC/RpcServer.cs
@@ -1,6 +1,7 @@
 using AntShares.Core;
 using AntShares.IO;
 using AntShares.IO.Json;
+using AntShares.Wallets;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
@@ -140,6 +141,22 @@ protected virtual JObject Process(string method, JArray _params)
                         Block block = _params[0].AsString().HexToBytes().AsSerializable<Block>();
                         return LocalNode.Relay(block);
                     }
+                case "validateaddress":
+                    {
+                        JObject json = new JObject();
+                        UInt160 scriptHash;
+                        try
+                        {
+                            scriptHash = Wallet.ToScriptHash(_params[0].AsString());
+                        }
+                        catch
+                        {
+                            scriptHash = null;
+                        }
+                        json["address"] = _params[0];
+                        json["isvalid"] = scriptHash != null;
+                        return json;
+                    }
                 default:
                     throw new RpcException(-32601, "Method not found");
             }
diff --git a/src/AntShares/SmartContract/StateMachine.cs b/src/AntShares/SmartContract/StateMachine.cs
index 79f899d625..bec2ef7a29 100644
--- a/src/AntShares/SmartContract/StateMachine.cs
+++ b/src/AntShares/SmartContract/StateMachine.cs
@@ -78,6 +78,15 @@ protected override bool Blockchain_GetAccount(ExecutionEngine engine)
             return true;
         }
 
+        protected override bool Blockchain_GetAsset(ExecutionEngine engine)
+        {
+            UInt256 hash = new UInt256(engine.EvaluationStack.Pop().GetByteArray());
+            AssetState asset = assets.TryGet(hash);
+            if (asset == null) return false;
+            engine.EvaluationStack.Push(StackItem.FromInterface(asset));
+            return true;
+        }
+
         private bool Account_SetVotes(ExecutionEngine engine)
         {
             AccountState account = engine.EvaluationStack.Pop().GetInterface<AccountState>();