diff --git a/build.gradle b/build.gradle
index 881e0a7..6fc6f9a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -51,7 +51,9 @@ dependencies {
     implementation 'org.bdware.doip:doip-audit-tool:1.1.2'
 }
 group = "org.bdware.sc"
-version = "1.6.5"
+
+version = "1.6.6"
+
 
 tasks.processResources.setDuplicatesStrategy(DuplicatesStrategy.INCLUDE)
 
diff --git a/src/main/config/org/bdware/sc/DoConfig.java b/src/main/config/org/bdware/sc/DoConfig.java
deleted file mode 100644
index 8e688fe..0000000
--- a/src/main/config/org/bdware/sc/DoConfig.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package org.bdware.sc;
-
-public class DoConfig {
-    public static boolean callContractUsingDOI = true;
-}
diff --git a/src/main/entry/org/bdware/sc/bean/Contract.java b/src/main/entry/org/bdware/sc/bean/Contract.java
index 5d04c3a..fb48469 100644
--- a/src/main/entry/org/bdware/sc/bean/Contract.java
+++ b/src/main/entry/org/bdware/sc/bean/Contract.java
@@ -2,18 +2,13 @@ package org.bdware.sc.bean;
 
 import com.google.gson.JsonElement;
 import org.bdware.sc.node.YjsType;
-import org.bouncycastle.crypto.CryptoException;
-import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
-import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
-import org.zz.gmhelper.SM2Util;
 
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
 import java.io.Serializable;
-import java.math.BigInteger;
 import java.util.HashMap;
 
-public class Contract extends SM2Verifiable implements Serializable {
+public class Contract implements Serializable {
     public String key;
     public ContractStartInfo startInfo = new ContractStartInfo();
     public int shardingId;
@@ -159,32 +154,14 @@ public class Contract extends SM2Verifiable implements Serializable {
         this.responseType = i;
     }
 
-    @Override
     public String getPublicKey() {
         return pubkey;
     }
 
-    @Override
     public void setPublicKey(String pubkey) {
         this.pubkey = pubkey;
     }
 
-    @Override
-    public String getContentStr() {
-        return type + "|" + script + "|" + owner;
-    }
-
-    public String signResult(String result) {
-        ECPrivateKeyParameters priKey =
-                new ECPrivateKeyParameters(new BigInteger(key, 16), SM2Util.DOMAIN_PARAMS);
-        try {
-            return ByteUtils.toHexString(SM2Util.sign(priKey, result.getBytes()));
-        } catch (CryptoException e) {
-            e.printStackTrace();
-        }
-        return null;
-    }
-
     public boolean getStateful() {
         return stateful;
     }