diff --git a/bcutils.js b/bcutils.js
index ed548f2..c4be283 100644
--- a/bcutils.js
+++ b/bcutils.js
@@ -10,7 +10,7 @@ const BC_MAX_TOKEN_IDX = 99999;
 
 const BC_TRANSID_MAX_PARAMS_NUM = 3;
 const BC_TRANSID_MAX_SEQID = 9999999;
-const BC_TRANS_FUNC_ACTIVATE = 11;
+const BC_TRANS_FUNC_ACTIVATE = 1;
 
 const BC_EPOCH = 1643212800;
 
@@ -76,7 +76,7 @@ function isSameAddress(a, b) {
 
 function genTransId(funcId, time, seqId, params) {
   let transId =
-      utils.pad(funcId, 2) +
+      utils.pad(funcId, 1) +
       utils.pad(toBcTime(time), 9) +
       utils.pad(seqId % BC_TRANSID_MAX_SEQID, 7);
   params.forEach
@@ -92,7 +92,21 @@ function genTransId(funcId, time, seqId, params) {
 }
 
 function isValidTransId(transId) {
-  return utils.isPureNumberStr(transId.toString()) && transId.toString().length == 78;
+  return utils.isPureNumberStr(transId.toString()) &&
+    (transId.toString().length == 77 || transId.toString().length == 78);
+}
+
+function extractParamsFromTransId(transId) {
+  if (isValidTransId(transId)) {
+    return null;
+  }
+  const transIdStr = transId.toString();
+  const params = [];
+  for (let i = 0; i < 3; ++i) {
+    const param = transId.substr(transIdStr.length - 20 * i , 20);
+    params.push(param);
+  }
+  return params;
 }
 
 exports.BC_BASE_GAME_ID = BC_BASE_GAME_ID;
@@ -120,3 +134,4 @@ exports.isValidTokenId = isValidTokenId;
 exports.isSameAddress = isSameAddress;
 exports.genTransId = genTransId;
 exports.isValidTransId = isValidTransId;
+exports.extractParamsFromTransId = extractParamsFromTransId;
diff --git a/utils.js b/utils.js
index 220479f..0e611e4 100644
--- a/utils.js
+++ b/utils.js
@@ -298,6 +298,12 @@ function mapToObject(mapObj) {
   return result;
 }
 
+function arrayToStrings(arr) {
+  for (let i = 0; i < arr.length; ++i) {
+    arr[i] = arr[i].toString();
+  }
+}
+
 async function serial(obj, cb) {
   let i = 0;
   const arr = obj instanceof Map ? mapToArray(obj) : obj;
@@ -306,6 +312,16 @@ async function serial(obj, cb) {
   }
 }
 
+function removeLeadZero(data) {
+  const dataStr = data.toString();
+  for (let i = 0; i < dataStr.length; ++i) {
+    if (dataStr[i] != '0') {
+      return dataStr.substr(i);
+    }
+  }
+  return dataStr;
+}
+
 exports.rspErr = rspErr;
 exports.rspOk = rspOk;
 exports.rspData = rspData;
@@ -344,3 +360,5 @@ exports.isPureNumberStr = isPureNumberStr;
 exports.serial = serial;
 exports.mapToArray = mapToArray;
 exports.mapToObject = mapToObject;
+exports.arrayToStrings = arrayToStrings;
+exports.removeLeadZero = removeLeadZero;