diff --git a/bcutils.js b/bcutils.js
index 70acaf1..1622c6c 100644
--- a/bcutils.js
+++ b/bcutils.js
@@ -42,25 +42,19 @@ function toNormalAddress(address) {
 function genTokenId(gameId, funcId, time, subIdx, idx) {
   const tokenId =
         funcId.toString() +
-        utils.pad(toBcGameId(gameId), 2) +
+        //utils.pad(toBcGameId(gameId), 2) +
         utils.pad(toBcTime(time), 9) +
         utils.pad(subIdx, 1) +
         utils.pad(1 + (idx % BC_MAX_TOKEN_IDX), 5);
   return tokenId;
 }
 
-function isValidTokenId(tokenId) {
+function isValidOldTokenId(tokenId) {
   return utils.isPureNumberStr(tokenId.toString()) && tokenId.toString().length == 18;
 }
 
-function setTokenIdSubIdx(tokenId, idx) {
-  if (!isValidTokenId(tokenId)) {
-    throw 'setTokenIdSubIdx error tokenId:' + tokenId + ' idx:' + idx;
-  }
-  if (idx < 0 || idx > 9 || idx.toString().length != 1) {
-    throw 'setTokenIdSubIdx error tokenId:' + tokenId + ' idx:' + idx;
-  }
-  throw 'setTokenIdSubIdx error tokenId:' + tokenId + ' idx:' + idx;
+function isValidTokenId(tokenId) {
+  return utils.isPureNumberStr(tokenId.toString()) && tokenId.toString().length == 16;
 }
 
 function isSameAddress(a, b) {
@@ -86,5 +80,4 @@ exports.toBcGameId = toBcGameId;
 exports.toNormalAddress = toNormalAddress;
 exports.genTokenId = genTokenId;
 exports.isValidTokenId = isValidTokenId;
-exports.setTokenIdSubIdx = setTokenIdSubIdx;
 exports.isSameAddress = isSameAddress;