diff --git a/js/ui-block.js b/js/ui-block.js
index ff66fc1..9bd4a33 100644
--- a/js/ui-block.js
+++ b/js/ui-block.js
@@ -4,14 +4,14 @@
 
 var uiBlock = function () {
 
-    var MAIN_NET_ATP_CONTRACT_ADDR = "n1zUNqeBPvsyrw5zxp9mKcDdLTjuaEL7s39";
-    var TEST_NET_ATP_CONTRACT_ADDR = "n1nkoSJVLQnaKnDKH56mtKtdjbgLKoHZhtD";
+    var MAIN_NET_ATP_CONTRACT_ADDR = "c1zUNqeBPvsyrw5zxp9mKcDdLTjuaEL7s39";
+    var TEST_NET_ATP_CONTRACT_ADDR = "c1nkoSJVLQnaKnDKH56mtKtdjbgLKoHZhtD";
 
-    var MAIN_NET_NAT_CONTRACT_ADDR = "n1mpgNi6KKdSzr7i5Ma7JsG5yPY9knf9He7";
-    var TEST_NET_NAT_CONTRACT_ADDR = "n22PdtQepev7rcQgy3zqfdAkNPN2pSpywZ8";
+    var MAIN_NET_NAT_CONTRACT_ADDR = "c1mpgNi6KKdSzr7i5Ma7JsG5yPY9knf9He7";
+    var TEST_NET_NAT_CONTRACT_ADDR = "c22PdtQepev7rcQgy3zqfdAkNPN2pSpywZ8";
 
-    var MAIN_NET_NAX_CONTRACT_ADDR = 'n1etmdwczuAUCnMMvpGasfi8kwUbb2ddvRJ';
-    var TEST_NET_NAX_CONTRACT_ADDR = 'n1osWtAu3V4Ho1ztq6BcMmCuoWDoLTFnPbw';
+    var MAIN_NET_NAX_CONTRACT_ADDR = 'c1etmdwczuAUCnMMvpGasfi8kwUbb2ddvRJ';
+    var TEST_NET_NAX_CONTRACT_ADDR = 'c1osWtAu3V4Ho1ztq6BcMmCuoWDoLTFnPbw';
 
     var old$fnModal = $.fn.modal;
 
@@ -22,7 +22,7 @@ var uiBlock = function () {
         numberAddComma: numberAddComma,
         toSi: toSi,
         validate: validate,
-        currency: "NAS",
+        currency: "CNTA",
         _currencyChangedListeners: [],
         addCurrencyChangedListener: addCurrencyChangedListener,
         getContractAddr: getContractAddr,
@@ -79,7 +79,7 @@ var uiBlock = function () {
     function isNRC20ContractAddr(addr) {
         var currencies = getCurrencies();
         for (var c in currencies) {
-            if (c != "NAS" && currencies[c] == addr) {
+            if (c != "CNTA" && currencies[c] == addr) {
                 return true;
             }
         }
@@ -89,7 +89,7 @@ var uiBlock = function () {
     function getCurrencies() {
         currencies = localSave.getItem("currencies");
         if (!currencies) {
-            currencies = { "NAS": "", "NAX": MAIN_NET_NAX_CONTRACT_ADDR, "ATP": MAIN_NET_ATP_CONTRACT_ADDR,  "NAT": MAIN_NET_NAT_CONTRACT_ADDR };
+            currencies = { "CNTA": "", "NAX": MAIN_NET_NAX_CONTRACT_ADDR, "ATP": MAIN_NET_ATP_CONTRACT_ADDR,  "NAT": MAIN_NET_NAT_CONTRACT_ADDR };
         } else {
             currencies = JSON.parse(currencies);
         }
@@ -201,9 +201,9 @@ var uiBlock = function () {
             // apiPrefix
 
             apiList = [
-                { chainId: 1, name: "Mainnet", url: "https://mainnet.nebulas.io", currencies: { "NAS": "", "NAX": MAIN_NET_NAX_CONTRACT_ADDR, "ATP": MAIN_NET_ATP_CONTRACT_ADDR, "NAT": MAIN_NET_NAT_CONTRACT_ADDR } },
+                { chainId: 1, name: "Mainnet", url: "https://mainnet.nebulas.io", currencies: { "CNTA": "", "NAX": MAIN_NET_NAX_CONTRACT_ADDR, "ATP": MAIN_NET_ATP_CONTRACT_ADDR, "NAT": MAIN_NET_NAT_CONTRACT_ADDR } },
                 { chainId: 1001, name: "Testnet", url: "https://testnet.nebulas.io", currencies: { "NAS": "", "NAX": TEST_NET_NAX_CONTRACT_ADDR, "ATP": TEST_NET_ATP_CONTRACT_ADDR, "NAT": TEST_NET_NAT_CONTRACT_ADDR } },
-                { chainId: 100, name: "Local Nodes", url: "http://127.0.0.1:8685", currencies: { "NAS": "" } }
+                { chainId: 100, name: "Local Nodes", url: "http://127.0.0.1:8685", currencies: { "CNTA": "" } }
             ];
             apiPrefix = (localSave.getItem("apiPrefix") || "").toLowerCase();
             sApiButtons = "";
@@ -480,7 +480,7 @@ var uiBlock = function () {
         for (i = 0; i < len && n >= 1000; ++i, n /= 1000);
 
         if (i == len && unit == "Wei")
-            for (i = 0, len = si.length - 1, unit = "NAS"; i < len && n >= 1000; ++i, n /= 1000);
+            for (i = 0, len = si.length - 1, unit = "CNTA"; i < len && n >= 1000; ++i, n /= 1000);
 
         n = n.toFixed();
         return (i == len ? numberAddComma(n) : n) + " " + si[i] + unit;
diff --git a/sendNas.html b/sendNas.html
index ca9aeb0..5de4a42 100644
--- a/sendNas.html
+++ b/sendNas.html
@@ -234,7 +234,7 @@ <h5 class=modal-title id=exampleModalLabel data-i18n=send-nas/transfer_msg>trans
             var currency = uiBlock.currency;
             var contractAddr = uiBlock.getContractAddr(uiBlock.currency);
             $("#balance").val("").trigger("input");
-            if (currency == "NAS") {
+            if (currency == "CNTA") {
                 neb.api.getAccountState(addr)
                     .then(function (resp) {
                         if (currency != uiBlock.currency) {
@@ -243,7 +243,7 @@ <h5 class=modal-title id=exampleModalLabel data-i18n=send-nas/transfer_msg>trans
                         if (resp.error) {
                             throw new Error(resp.error);
                         }
-                        var nas = Unit.fromBasic(resp.balance, "nas").toString(10);
+                        var nas = Unit.fromBasic(resp.balance, "cnta").toString(10);
                         $("#balance").val(nas).trigger("input"); // add comma & unit from value, needs trigger 'input' event if via set o.value
                         $("#nonce").val(parseInt(resp.nonce || 0) + 1);
                     })
@@ -277,7 +277,7 @@ <h5 class=modal-title id=exampleModalLabel data-i18n=send-nas/transfer_msg>trans
                         if(uiBlock.currency === "NAX") {
                             balance = Unit.fromBasic(b, "gwei").toString();
                         } else {
-                            balance = Unit.fromBasic(b, "nas").toString(10);
+                            balance = Unit.fromBasic(b, ).toString(10);
                         }
                         
                         $("#balance").val(balance).trigger("input"); // add comma & unit from value, needs trigger 'input' event if via set o.value
@@ -327,7 +327,7 @@ <h5 class=modal-title id=exampleModalLabel data-i18n=send-nas/transfer_msg>trans
                     gLastGenerateInfo.gasprice != gasprice ||
                     gLastGenerateInfo.nonce != nonce) try {  //TODO: 加括号
                         var tmp = Unit.fromBasic(Utils.toBigNumber(gaslimit)
-                            .times(Utils.toBigNumber(gasprice)), "nas");
+                            .times(Utils.toBigNumber(gasprice)), "cnta");
 
                         if (Utils.toBigNumber(balance).lt(Utils.toBigNumber(amount).plus(tmp))) //TODO: 加括号； tmp-->max gas used
                             if (Utils.toBigNumber(balance).lt(tmp))
@@ -337,7 +337,7 @@ <h5 class=modal-title id=exampleModalLabel data-i18n=send-nas/transfer_msg>trans
 
                         var a = amount.split(".");
                         var amountValid = a.length == 1 || a[1].length <= 18;
-                        if (uiBlock.currency == "NAS") {
+                        if (uiBlock.currency == "CNTA") {
                             if (!amountValid) throw new Error("Invalid value! The minimum unit is wei (1^-18nas) ");
                             gTx = new Transaction(parseInt(localSave.getItem("chainId")), gAccount, toAddress, Unit.nasToBasic(Utils.toBigNumber(amount)), parseInt(nonce), gasprice, gaslimit);
                         } else {
@@ -407,7 +407,7 @@ <h5 class=modal-title id=exampleModalLabel data-i18n=send-nas/transfer_msg>trans
                         neb.api.getAccountState($(".icon-address.from input").val())
                             .then(function (resp) {
                                 // console.log("getAccountState resp: " + JSON.stringify(resp));
-                                var balanceNas = Unit.fromBasic(resp.balance, "nas").toString(10);
+                                var balanceNas = Unit.fromBasic(resp.balance, "cnta").toString(10);
                                 $("#balance").val(balanceNas);
                                 $("#nonce").val(resp.nonce);
                             }).catch(function (err) {
diff --git a/sendOffline.html b/sendOffline.html
index 520aa82..34f145b 100644
--- a/sendOffline.html
+++ b/sendOffline.html
@@ -261,7 +261,7 @@ <h4 class=modal-title>info</h4>
                 tx = Transaction.prototype.fromProto(val);
                 var to = tx.to.getAddressString();
                 var value = tx.value;
-                var currency = "NAS"
+                var currency = "CNTA"
                 if (tx.data.payload) {
                     var data = eval("var d = " + nebulas.CryptoUtils.toBuffer(tx.data.payload).toString() + "; d");
                     var args = eval("var args = " + data["Args"]+"; args");
@@ -277,7 +277,7 @@ <h4 class=modal-title>info</h4>
                 if(uiBlock.currency === "NAX") {
                     balance = unit.fromBasic(value, "gwei").toString();
                 } else {
-                    balance = unit.fromBasic(value, "nas").toString(10);
+                    balance = unit.fromBasic(value, "cnta").toString(10);
                 }
 
                 $("#value").val(balance).trigger("input");
@@ -305,7 +305,7 @@ <h4 class=modal-title>info</h4>
                 var contract = null;
 
                 toaccount = Account.fromAddress(toaddress);
-                if (uiBlock.currency != "NAS") {
+                if (uiBlock.currency != "CNTA") {
 
                     var transfer_amount;
                     if(uiBlock.currency === "NAX") {
@@ -325,7 +325,7 @@ <h4 class=modal-title>info</h4>
                     gLastGenerateInfo.contract != contract) try {
                         var a = amount.split(".");
                         var amountValid = a.length == 1 || a[1].length <= 18;
-                        if (uiBlock.currency == "NAS") {
+                        if (uiBlock.currency == "CNTA") {
                             if (!amountValid) throw new Error("Invalid value! The minimum unit is wei (1^-18nas) ");
                             tx = new Transaction(parseInt(localSave.getItem("chainId")), gAccount, toaccount.getAddressString(), unit.nasToBasic(amount), parseInt(nonce), gasprice, gaslimit);
                         } else {
diff --git a/viewWalletInfo.html b/viewWalletInfo.html
index 16f75bb..e75a28c 100644
--- a/viewWalletInfo.html
+++ b/viewWalletInfo.html
@@ -145,7 +145,7 @@
             var currency = uiBlock.currency;
             var contractAddr = uiBlock.getContractAddr(uiBlock.currency);
             $("#amount").val("").trigger("input");
-            if (currency == "NAS") {
+            if (currency == "CNTA") {
                 neb.api.getAccountState(addr)
                     .then(function (resp) {
                         if (currency != uiBlock.currency) {