diff --git a/Action.js b/Action.js
index f78ff69..9abdb08 100644
--- a/Action.js
+++ b/Action.js
@@ -82,7 +82,7 @@ DAD.verifyHash = function (actionData) {
   return typedAction.verifyHash()
 }
 
-MOM.validateMe = function() { // Applicable on chain server. 子类应当覆盖本方法，静态的检查事务内容的格式和语义，是否符合该子类事务的特性要求。To validate an action's content format. 
+MOM.validateMe = function() { // Applicable on both client and chain server. 子类应当覆盖本方法，静态的检查事务内容的格式。不能检查 balance 等需要全链数据库的东西，因为本方法也要用在前端检查。 
   // to implement in subclasses: 检查子类事务内容的格式
   let typedAction = new wo[this.type](this)
   return typedAction.validateMe()
@@ -124,11 +124,11 @@ DAD._initTypeDict = function(typedActionDict) {
 }
 
 DAD.build = async function (action, keypair) { // Applicable on client. 客户端调用 Action.build，即可新建、并打包成一个完整的子事务，不需要亲自调用 constructor, packMe 等方法。 
-  if (action && action.type && keypair && keypair.seckey && keypair.pubkey) {
+  if (action && action.type && keypair && keypair.seckey && keypair.pubkey && ticCrypto.seckey2pubkey(keypair.seckey)===keypair.pubkey) {
     let typedAction = new wo[action.type](action)
     typedAction.actorPubkey = keypair.pubkey
     if (typedAction.validateMe()) {
-      await typedAction.packMe(keypair)
+      await typedAction.packMe(keypair) // 在 packMe 里，会把 actorPubkey 转存为 actorAddress。
       return typedAction
     }
   }
diff --git a/ActionTransfer.js b/ActionTransfer.js
index 1b32121..c03f4b3 100644
--- a/ActionTransfer.js
+++ b/ActionTransfer.js
@@ -13,10 +13,8 @@ MOM.__proto__ = Action.prototype
 
 MOM.validateMe = function () {
   // if (sender && sender.type !== 'multisig' && action.toAddress != action.actorAddress && sender.balance >= action.amount + action.fee){
-  return this.actorAddress && this.actorPubkey && ticCrypto.pubkey2address(this.actorPubkey)=== this.actorAddress // 必须检查发起人地址和公钥是匹配的，否则客户端能够造假
-    && this.toAddress && this.toAddress != this.actorAddress 
-    && this.amount && this.amount > 0 && (this.fee >= 0)
-   
+  return this.actorPubkey && this.toAddress && ticCrypto.pubkey2address(this.actorPubkey)!== this.toAddress // 不能转帐给自己。
+    && this.amount && this.amount > 0 && (this.fee >= 0)   
 }
 
 MOM.executableMe = async function() {