diff --git a/src/AntShares/Core/Block.cs b/src/AntShares/Core/Block.cs
index 7485cc057d..8eac9ef940 100644
--- a/src/AntShares/Core/Block.cs
+++ b/src/AntShares/Core/Block.cs
@@ -49,7 +49,7 @@ public Header Header
         /// </summary>
         InventoryType IInventory.InventoryType => InventoryType.Block;
 
-        public override int Size => base.Size + Transactions.Length.GetVarSize() + Transactions.Sum(p => p.Size);
+        public override int Size => base.Size + Transactions.GetVarSize();
 
         public static Fixed8 CalculateNetFee(IEnumerable<Transaction> transactions)
         {
diff --git a/src/AntShares/Core/ClaimTransaction.cs b/src/AntShares/Core/ClaimTransaction.cs
index 74938650e4..74c96b168f 100644
--- a/src/AntShares/Core/ClaimTransaction.cs
+++ b/src/AntShares/Core/ClaimTransaction.cs
@@ -18,7 +18,7 @@ public class ClaimTransaction : Transaction
         /// </summary>
         public CoinReference[] Claims;
 
-        public override int Size => base.Size + Claims.Length.GetVarSize() + Claims.Sum(p => p.Size);
+        public override int Size => base.Size + Claims.GetVarSize();
 
         public ClaimTransaction()
             : base(TransactionType.ClaimTransaction)
diff --git a/src/AntShares/Wallets/ContractParameterType.cs b/src/AntShares/Core/ContractParameterType.cs
similarity index 94%
rename from src/AntShares/Wallets/ContractParameterType.cs
rename to src/AntShares/Core/ContractParameterType.cs
index 8e37b7060a..5b9bd6fb0b 100644
--- a/src/AntShares/Wallets/ContractParameterType.cs
+++ b/src/AntShares/Core/ContractParameterType.cs
@@ -1,4 +1,4 @@
-namespace AntShares.Wallets
+namespace AntShares.Core
 {
     /// <summary>
     /// 表示智能合约的参数类型
diff --git a/src/AntShares/Core/PublishTransaction.cs b/src/AntShares/Core/PublishTransaction.cs
index 5407e876eb..b90767a1e6 100644
--- a/src/AntShares/Core/PublishTransaction.cs
+++ b/src/AntShares/Core/PublishTransaction.cs
@@ -1,6 +1,5 @@
 using AntShares.IO;
 using AntShares.IO.Json;
-using System;
 using System.IO;
 using System.Linq;
 
@@ -8,11 +7,18 @@ namespace AntShares.Core
 {
     public class PublishTransaction : Transaction
     {
-        public byte[][] Contracts;
+        public byte[] Script;
+        public ContractParameterType[] ParameterList;
+        public ContractParameterType ReturnType;
+        public string Name;
+        public byte CodeVersion;
+        public string Author;
+        public string Email;
+        public string Description;
 
-        public override int Size => base.Size + Contracts.Length.GetVarSize() + Contracts.Sum(p => p.Length.GetVarSize() + p.Length);
+        public override int Size => base.Size + Script.GetVarSize() + ParameterList.GetVarSize() + sizeof(ContractParameterType) + Name.GetVarSize() + sizeof(byte) + Author.GetVarSize() + Email.GetVarSize() + Description.GetVarSize();
 
-        public override Fixed8 SystemFee => Fixed8.FromDecimal(500 * Contracts.Length);
+        public override Fixed8 SystemFee => Fixed8.FromDecimal(500);
 
         public PublishTransaction()
             : base(TransactionType.PublishTransaction)
@@ -21,23 +27,40 @@ public PublishTransaction()
 
         protected override void DeserializeExclusiveData(BinaryReader reader)
         {
-            Contracts = new byte[reader.ReadByte()][];
-            if (Contracts.Length == 0) throw new FormatException();
-            for (int i = 0; i < Contracts.Length; i++)
-                Contracts[i] = reader.ReadVarBytes();
+            Script = reader.ReadVarBytes(65536);
+            ParameterList = reader.ReadVarBytes(252).Select(p => (ContractParameterType)p).ToArray();
+            ReturnType = (ContractParameterType)reader.ReadByte();
+            Name = reader.ReadVarString(252);
+            CodeVersion = reader.ReadByte();
+            Author = reader.ReadVarString(252);
+            Email = reader.ReadVarString(252);
+            Description = reader.ReadVarString(65536);
         }
 
         protected override void SerializeExclusiveData(BinaryWriter writer)
         {
-            writer.Write((byte)Contracts.Length);
-            for (int i = 0; i < Contracts.Length; i++)
-                writer.WriteVarBytes(Contracts[i]);
+            writer.WriteVarBytes(Script);
+            writer.WriteVarBytes(ParameterList.Cast<byte>().ToArray());
+            writer.Write((byte)ReturnType);
+            writer.WriteVarString(Name);
+            writer.Write(CodeVersion);
+            writer.WriteVarString(Author);
+            writer.WriteVarString(Email);
+            writer.WriteVarString(Description);
         }
 
         public override JObject ToJson()
         {
             JObject json = base.ToJson();
-            json["contracts"] = new JArray(Contracts.Select(p => new JString(p.ToHexString())));
+            json["contract"] = new JObject();
+            json["contract"]["script"] = Script.ToHexString();
+            json["contract"]["parameters"] = new JArray(ParameterList.Select(p => (JObject)p));
+            json["contract"]["returntype"] = ReturnType;
+            json["contract"]["name"] = Name;
+            json["contract"]["version"] = CodeVersion;
+            json["contract"]["author"] = Author;
+            json["contract"]["email"] = Email;
+            json["contract"]["description"] = Description;
             return json;
         }
     }
diff --git a/src/AntShares/Core/RegisterTransaction.cs b/src/AntShares/Core/RegisterTransaction.cs
index 6ddb6e8a49..c271d07ec0 100644
--- a/src/AntShares/Core/RegisterTransaction.cs
+++ b/src/AntShares/Core/RegisterTransaction.cs
@@ -7,7 +7,6 @@
 using System.Globalization;
 using System.IO;
 using System.Linq;
-using System.Text;
 
 namespace AntShares.Core
 {
@@ -39,21 +38,8 @@ public class RegisterTransaction : Transaction
         /// 资产管理员的合约散列值
         /// </summary>
         public UInt160 Admin;
-        public string CertUrl;
 
-        public override int Size
-        {
-            get
-            {
-                int size = base.Size;
-                size += sizeof(AssetType) + Encoding.UTF8.GetByteCount(Name).GetVarSize() + Encoding.UTF8.GetByteCount(Name) + Amount.Size + sizeof(byte) + Issuer.Size + Admin.Size;
-                if (Version > 0)
-                {
-                    size += sizeof(byte) + Encoding.UTF8.GetByteCount(CertUrl);
-                }
-                return size;
-            }
-        }
+        public override int Size => base.Size + sizeof(AssetType) + Name.GetVarSize() + Amount.Size + sizeof(byte) + Issuer.Size + Admin.Size;
 
         /// <summary>
         /// 系统费用
@@ -89,10 +75,6 @@ protected override void DeserializeExclusiveData(BinaryReader reader)
             Precision = reader.ReadByte();
             Issuer = ECPoint.DeserializeFrom(reader, ECCurve.Secp256r1);
             Admin = reader.ReadSerializable<UInt160>();
-            if (Version > 0)
-            {
-                CertUrl = reader.ReadVarString(252);
-            }
         }
 
         private Dictionary<CultureInfo, string> _names;
@@ -165,10 +147,6 @@ protected override void SerializeExclusiveData(BinaryWriter writer)
             writer.Write(Precision);
             writer.Write(Issuer);
             writer.Write(Admin);
-            if (Version > 0)
-            {
-                writer.WriteVarString(CertUrl);
-            }
         }
 
         /// <summary>
@@ -194,10 +172,6 @@ public override JObject ToJson()
             json["asset"]["low"] = Amount.GetData() & 0xffffffff;
             json["asset"]["issuer"] = Issuer.ToString();
             json["asset"]["admin"] = Wallet.ToAddress(Admin);
-            if (Version > 0)
-            {
-                json["asset"]["cert"] = CertUrl;
-            }
             return json;
         }
 
diff --git a/src/AntShares/Core/Transaction.cs b/src/AntShares/Core/Transaction.cs
index 7457f01340..2c115ce1ed 100644
--- a/src/AntShares/Core/Transaction.cs
+++ b/src/AntShares/Core/Transaction.cs
@@ -91,7 +91,7 @@ public IReadOnlyDictionary<CoinReference, TransactionOutput> References
             }
         }
 
-        public virtual int Size => sizeof(TransactionType) + sizeof(byte) + Attributes.Length.GetVarSize() + Attributes.Sum(p => p.Size) + Inputs.Length.GetVarSize() + Inputs.Sum(p => p.Size) + Outputs.Length.GetVarSize() + Outputs.Sum(p => p.Size) + Scripts.Length.GetVarSize() + Scripts.Sum(p => p.Size);
+        public virtual int Size => sizeof(TransactionType) + sizeof(byte) + Attributes.GetVarSize() + Inputs.GetVarSize() + Outputs.GetVarSize() + Scripts.GetVarSize();
 
         /// <summary>
         /// 系统费用
diff --git a/src/AntShares/Core/TransactionAttribute.cs b/src/AntShares/Core/TransactionAttribute.cs
index 2193865583..53267f66ec 100644
--- a/src/AntShares/Core/TransactionAttribute.cs
+++ b/src/AntShares/Core/TransactionAttribute.cs
@@ -32,7 +32,7 @@ public int Size
                 else if (Usage == TransactionAttributeUsage.DescriptionUrl)
                     return sizeof(TransactionAttributeUsage) + sizeof(byte) + Data.Length;
                 else
-                    return sizeof(TransactionAttributeUsage) + Data.Length.GetVarSize() + Data.Length;
+                    return sizeof(TransactionAttributeUsage) + Data.GetVarSize();
             }
         }
 
diff --git a/src/AntShares/Core/Witness.cs b/src/AntShares/Core/Witness.cs
index 0bbfb2e108..342a8958d6 100644
--- a/src/AntShares/Core/Witness.cs
+++ b/src/AntShares/Core/Witness.cs
@@ -12,7 +12,7 @@ public class Witness : ISerializable
         public byte[] StackScript;
         public byte[] RedeemScript;
 
-        public int Size => StackScript.Length.GetVarSize() + StackScript.Length + RedeemScript.Length.GetVarSize() + RedeemScript.Length;
+        public int Size => StackScript.GetVarSize() + RedeemScript.GetVarSize();
 
         void ISerializable.Deserialize(BinaryReader reader)
         {
diff --git a/src/AntShares/IO/Helper.cs b/src/AntShares/IO/Helper.cs
index 0a28c4949f..f551c99885 100644
--- a/src/AntShares/IO/Helper.cs
+++ b/src/AntShares/IO/Helper.cs
@@ -2,6 +2,7 @@
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Text;
 
 namespace AntShares.IO
@@ -30,7 +31,7 @@ public static ISerializable AsSerializable(this byte[] value, Type type)
             return serializable;
         }
 
-        internal static int GetVarSize(this int value)
+        internal static int GetVarSize(int value)
         {
             if (value < 0xFD)
                 return sizeof(byte);
@@ -40,6 +41,41 @@ internal static int GetVarSize(this int value)
                 return sizeof(byte) + sizeof(uint);
         }
 
+        internal static int GetVarSize<T>(this T[] value)
+        {
+            int value_size;
+            Type t = typeof(T);
+            if (typeof(ISerializable).IsAssignableFrom(t))
+            {
+                value_size = value.OfType<ISerializable>().Sum(p => p.Size);
+            }
+            else if (t.GetTypeInfo().IsEnum)
+            {
+                int element_size;
+                Type u = t.GetTypeInfo().GetEnumUnderlyingType();
+                if (u == typeof(sbyte) || u == typeof(byte))
+                    element_size = 1;
+                else if (u == typeof(short) || u == typeof(ushort))
+                    element_size = 2;
+                else if (u == typeof(int) || u == typeof(uint))
+                    element_size = 4;
+                else //if (u == typeof(long) || u == typeof(ulong))
+                    element_size = 8;
+                value_size = value.Length * element_size;
+            }
+            else
+            {
+                value_size = value.Length * Marshal.SizeOf<T>();
+            }
+            return GetVarSize(value.Length) + value_size;
+        }
+
+        internal static int GetVarSize(this string value)
+        {
+            int size = Encoding.UTF8.GetByteCount(value);
+            return GetVarSize(size) + size;
+        }
+
         internal static string ReadFixedString(this BinaryReader reader, int length)
         {
             byte[] data = reader.ReadBytes(length);
diff --git a/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs b/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs
index dfc3647e5d..513245582c 100644
--- a/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs
+++ b/src/AntShares/Implementations/Blockchains/LevelDB/LevelDBBlockchain.cs
@@ -223,7 +223,7 @@ public override byte[] GetContract(UInt160 hash)
             Slice value;
             if (!db.TryGet(ReadOptions.Default, SliceBuilder.Begin(DataEntryPrefix.DATA_Contract).Add(hash), out value))
                 return null;
-            return value.ToArray();
+            return value.ToArray().Skip(32).ToArray();
         }
 
         public override IEnumerable<EnrollmentTransaction> GetEnrollments(IEnumerable<Transaction> others)
@@ -510,9 +510,9 @@ private void Persist(Block block)
                         }
                         break;
                     case TransactionType.PublishTransaction:
-                        foreach (byte[] script in ((PublishTransaction)tx).Contracts)
                         {
-                            batch.Put(SliceBuilder.Begin(DataEntryPrefix.DATA_Contract).Add(script.ToScriptHash()), script);
+                            PublishTransaction publish_tx = (PublishTransaction)tx;
+                            batch.Put(SliceBuilder.Begin(DataEntryPrefix.DATA_Contract).Add(publish_tx.Script.ToScriptHash()), SliceBuilder.Begin().Add(tx.Hash).Add(publish_tx.Script));
                         }
                         break;
                 }
diff --git a/src/AntShares/Network/Payloads/AddrPayload.cs b/src/AntShares/Network/Payloads/AddrPayload.cs
index b0102272d3..e22567ed95 100644
--- a/src/AntShares/Network/Payloads/AddrPayload.cs
+++ b/src/AntShares/Network/Payloads/AddrPayload.cs
@@ -1,6 +1,5 @@
 using AntShares.IO;
 using System.IO;
-using System.Linq;
 
 namespace AntShares.Network.Payloads
 {
@@ -8,7 +7,7 @@ internal class AddrPayload : ISerializable
     {
         public NetworkAddressWithTime[] AddressList;
 
-        public int Size => AddressList.Length.GetVarSize() + AddressList.Sum(p => p.Size);
+        public int Size => AddressList.GetVarSize();
 
         public static AddrPayload Create(params NetworkAddressWithTime[] addresses)
         {
diff --git a/src/AntShares/Network/Payloads/ConsensusPayload.cs b/src/AntShares/Network/Payloads/ConsensusPayload.cs
index 55814237a2..acf1de540e 100644
--- a/src/AntShares/Network/Payloads/ConsensusPayload.cs
+++ b/src/AntShares/Network/Payloads/ConsensusPayload.cs
@@ -47,7 +47,7 @@ Witness[] ISignable.Scripts
             }
         }
 
-        public int Size => sizeof(uint) + PrevHash.Size + sizeof(uint) + sizeof(ushort) + sizeof(uint) + Data.Length.GetVarSize() + Data.Length + 1 + Script.Size;
+        public int Size => sizeof(uint) + PrevHash.Size + sizeof(uint) + sizeof(ushort) + sizeof(uint) + Data.GetVarSize() + 1 + Script.Size;
 
         void ISerializable.Deserialize(BinaryReader reader)
         {
diff --git a/src/AntShares/Network/Payloads/FilterAddPayload.cs b/src/AntShares/Network/Payloads/FilterAddPayload.cs
index ca8ab3892e..920bcfc8bc 100644
--- a/src/AntShares/Network/Payloads/FilterAddPayload.cs
+++ b/src/AntShares/Network/Payloads/FilterAddPayload.cs
@@ -7,7 +7,7 @@ internal class FilterAddPayload : ISerializable
     {
         public byte[] Data;
 
-        public int Size => Data.Length.GetVarSize() + Data.Length;
+        public int Size => Data.GetVarSize();
 
         void ISerializable.Deserialize(BinaryReader reader)
         {
diff --git a/src/AntShares/Network/Payloads/FilterLoadPayload.cs b/src/AntShares/Network/Payloads/FilterLoadPayload.cs
index 38e4cc7cbf..9f340f1353 100644
--- a/src/AntShares/Network/Payloads/FilterLoadPayload.cs
+++ b/src/AntShares/Network/Payloads/FilterLoadPayload.cs
@@ -11,7 +11,7 @@ internal class FilterLoadPayload : ISerializable
         public byte K;
         public uint Tweak;
 
-        public int Size => Filter.Length.GetVarSize() + Filter.Length + sizeof(byte) + sizeof(uint);
+        public int Size => Filter.GetVarSize() + sizeof(byte) + sizeof(uint);
 
         public static FilterLoadPayload Create(BloomFilter filter)
         {
diff --git a/src/AntShares/Network/Payloads/GetBlocksPayload.cs b/src/AntShares/Network/Payloads/GetBlocksPayload.cs
index 3357288b89..c28db10fbb 100644
--- a/src/AntShares/Network/Payloads/GetBlocksPayload.cs
+++ b/src/AntShares/Network/Payloads/GetBlocksPayload.cs
@@ -1,6 +1,5 @@
 using AntShares.IO;
 using System.IO;
-using System.Linq;
 
 namespace AntShares.Network.Payloads
 {
@@ -9,7 +8,7 @@ internal class GetBlocksPayload : ISerializable
         public UInt256[] HashStart;
         public UInt256 HashStop;
 
-        public int Size => HashStart.Length.GetVarSize() + HashStart.Sum(p => p.Size) + HashStop.Size;
+        public int Size => HashStart.GetVarSize() + HashStop.Size;
 
         public static GetBlocksPayload Create(UInt256 hash_start, UInt256 hash_stop = null)
         {
diff --git a/src/AntShares/Network/Payloads/HeadersPayload.cs b/src/AntShares/Network/Payloads/HeadersPayload.cs
index 4f317c966f..bc281a6b7d 100644
--- a/src/AntShares/Network/Payloads/HeadersPayload.cs
+++ b/src/AntShares/Network/Payloads/HeadersPayload.cs
@@ -10,7 +10,7 @@ internal class HeadersPayload : ISerializable
     {
         public Header[] Headers;
 
-        public int Size => Headers.Length.GetVarSize() + Headers.Sum(p => p.Size);
+        public int Size => Headers.GetVarSize();
 
         public static HeadersPayload Create(IEnumerable<Header> headers)
         {
diff --git a/src/AntShares/Network/Payloads/InvPayload.cs b/src/AntShares/Network/Payloads/InvPayload.cs
index 6dfb7fb5aa..0f882f8901 100644
--- a/src/AntShares/Network/Payloads/InvPayload.cs
+++ b/src/AntShares/Network/Payloads/InvPayload.cs
@@ -1,7 +1,6 @@
 using AntShares.IO;
 using System;
 using System.IO;
-using System.Linq;
 
 namespace AntShares.Network.Payloads
 {
@@ -10,7 +9,7 @@ internal class InvPayload : ISerializable
         public InventoryType Type;
         public UInt256[] Hashes;
 
-        public int Size => sizeof(InventoryType) + Hashes.Length.GetVarSize() + Hashes.Sum(p => p.Size);
+        public int Size => sizeof(InventoryType) + Hashes.GetVarSize();
 
         public static InvPayload Create(InventoryType type, params UInt256[] hashes)
         {
diff --git a/src/AntShares/Network/Payloads/MerkleBlockPayload.cs b/src/AntShares/Network/Payloads/MerkleBlockPayload.cs
index 2ed7b44d00..2d6912da99 100644
--- a/src/AntShares/Network/Payloads/MerkleBlockPayload.cs
+++ b/src/AntShares/Network/Payloads/MerkleBlockPayload.cs
@@ -13,7 +13,7 @@ internal class MerkleBlockPayload : BlockBase
         public UInt256[] Hashes;
         public byte[] Flags;
 
-        public override int Size => base.Size + sizeof(int) + Hashes.Length.GetVarSize() + Hashes.Sum(p => p.Size) + Flags.Length.GetVarSize() + Flags.Length;
+        public override int Size => base.Size + sizeof(int) + Hashes.GetVarSize() + Flags.GetVarSize();
 
         public static MerkleBlockPayload Create(Block block, BitArray flags)
         {
diff --git a/src/AntShares/Network/Payloads/VersionPayload.cs b/src/AntShares/Network/Payloads/VersionPayload.cs
index ab9b5c8961..cd14d4fb98 100644
--- a/src/AntShares/Network/Payloads/VersionPayload.cs
+++ b/src/AntShares/Network/Payloads/VersionPayload.cs
@@ -2,7 +2,6 @@
 using AntShares.IO;
 using System;
 using System.IO;
-using System.Text;
 
 namespace AntShares.Network.Payloads
 {
@@ -17,7 +16,7 @@ internal class VersionPayload : ISerializable
         public uint StartHeight;
         public bool Relay;
 
-        public int Size => sizeof(uint) + sizeof(ulong) + sizeof(uint) + sizeof(ushort) + sizeof(uint) + Encoding.UTF8.GetByteCount(UserAgent).GetVarSize() + Encoding.UTF8.GetByteCount(UserAgent) + sizeof(uint) + sizeof(bool);
+        public int Size => sizeof(uint) + sizeof(ulong) + sizeof(uint) + sizeof(ushort) + sizeof(uint) + UserAgent.GetVarSize() + sizeof(uint) + sizeof(bool);
 
         public static VersionPayload Create(int port, uint nonce, string userAgent)
         {
diff --git a/src/AntShares/Wallets/Contract.cs b/src/AntShares/Wallets/Contract.cs
index 0b6efd7789..a24245e7ec 100644
--- a/src/AntShares/Wallets/Contract.cs
+++ b/src/AntShares/Wallets/Contract.cs
@@ -69,7 +69,7 @@ public UInt160 ScriptHash
             }
         }
 
-        public int Size => PublicKeyHash.Size + ParameterList.Length.GetVarSize() + ParameterList.Length + RedeemScript.Length.GetVarSize() + RedeemScript.Length;
+        public int Size => PublicKeyHash.Size + ParameterList.GetVarSize() + RedeemScript.GetVarSize();
 
         public ContractType Type
         {
diff --git a/src/AntShares/project.json b/src/AntShares/project.json
index d2e422748e..bbb0d2af01 100644
--- a/src/AntShares/project.json
+++ b/src/AntShares/project.json
@@ -2,7 +2,7 @@
   "authors": [ "The Antshares team" ],
   "copyright": "2015-2016 The Antshares team",
   "title": "AntShares",
-  "version": "1.3.6",
+  "version": "1.4.0",
   "buildOptions": {
     "allowUnsafe": true,
     "copyToOutput": {