diff --git a/data/bin01.txt b/data/bin01.txt
new file mode 100644
index 0000000..1491da6
--- /dev/null
+++ b/data/bin01.txt
@@ -0,0 +1 @@
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
diff --git a/data/param01.json b/data/param01.json
new file mode 100644
index 0000000..16cf3df
--- /dev/null
+++ b/data/param01.json
@@ -0,0 +1,3 @@
+{ "bs": "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",
+  "txOrigin": "0x4bad3053d574cd54513babe21db3f09bea1d387d"
+}
diff --git a/package-lock.json b/package-lock.json
index 207be95..9a5ac90 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "protocol2-js",
-  "version": "0.1.25",
+  "version": "0.2.18",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -708,9 +708,9 @@
       "integrity": "sha512-n6wvpdE43VFtJq+lUDYDBFUwV8TZbuGXLV4D6wKafg13ldznKsyEvatubnmUe31zcvelSzOHF+XbaT+Bl9ObDg=="
     },
     "es6-promisify": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-6.0.0.tgz",
-      "integrity": "sha512-8Tbqjrb8lC85dd81haajYwuRmiU2rkqNAFnlvQOJeeKqdUloIlI+JcUqeJruV4rCm5Y7oNU7jfs2FbmxhRR/2g=="
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-6.0.1.tgz",
+      "integrity": "sha512-J3ZkwbEnnO+fGAKrjVpeUAnZshAdfZvbhQpqfIH9kSAspReRC4nJnu8ewm55b4y9ElyeuhCTzJD0XiH8Tsbhlw=="
     },
     "escape-html": {
       "version": "1.0.3",
diff --git a/package.json b/package.json
index c862c10..ccc05e5 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "bignumber.js": "^4.1.0",
     "bitwise-xor": "0.0.0",
     "bn.js": "^4.11.8",
-    "es6-promisify": "^6.0.0",
+    "es6-promisify": "^6.0.1",
     "ethereum-tx-decoder": "^2.0.1",
     "ethereumjs-abi": "^0.6.5",
     "ethereumjs-util": "^5.2.0",
diff --git a/src/exchange_deserializer.ts b/src/exchange_deserializer.ts
index 3085803..057eca9 100644
--- a/src/exchange_deserializer.ts
+++ b/src/exchange_deserializer.ts
@@ -1,3 +1,4 @@
+import assert = require("assert");
 import { BigNumber } from "bignumber.js";
 import BN = require("bn.js");
 import abi = require("ethereumjs-abi");
@@ -112,7 +113,10 @@ export class ExchangeDeserializer {
       tokenRecipient: this.nextAddress(),
       walletSplitPercentage: this.nextUint16(),
     };
-    order.feeToken = order.feeToken ? order.feeToken : this.context.lrcAddress;
+
+    if (this.context) {
+      order.feeToken = order.feeToken ? order.feeToken : this.context.lrcAddress;
+    }
     order.tokenRecipient = order.tokenRecipient ? order.tokenRecipient : order.owner;
     return order;
   }
diff --git a/src/main.ts b/src/main.ts
index 809aa52..a341d9e 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -3,53 +3,46 @@ import { logDebug } from "./logs";
 import { ProtocolSimulator } from "./protocol_simulator";
 import { RingsInfo } from "./types";
 
-function parseArgs(): [boolean, string] {
+async function main() {
   const args = process.argv.slice(2);
-  let isBinary = true;
-  let ringData = "";
-  if (args.length === 0) {
-    throw new Error("error: no ringData found");
+  console.log("args:", args );
+
+  if (args.length < 2) {
+    throw new Error("error: not enough params.");
   }
-  if (args[0] === "-f") {
-    const fileName = args[1];
-    const fileContent = fs.readFileSync(fileName, "utf8");
+  const fileName = args[1];
+  const fileContent = fs.readFileSync(fileName, "utf8");
+
+  if (args[0] === "--decode-param") {
     try {
-      const ringsInfo: RingsInfo = JSON.parse(fileContent);
-      isBinary = false;
+      const paramInfo: any = JSON.parse(fileContent);
+      console.log(paramInfo);
+
+      const protocolSimulator = new ProtocolSimulator(undefined);
+      const ringsInfo = protocolSimulator.deserialize(paramInfo.bs, paramInfo.txOrigin);
+      console.log("deserialized ringsInfo: ", ringsInfo);
     } catch (err) {
-      ringData = fileContent;
+      console.log(err);
     }
-  } else if (args[0] === "-b") {
-    const binData = args[1];
-    logDebug(binData);
-  } else {
-    if (args[0].startsWith("-")) {
-      throw new Error("error: invalid argument:" + args[0]);
-    } else {
-      ringData = args[0];
-    }
-  }
+  } else if (args[0] === "--encode-rings") {
+    let ringsInfo: RingsInfo;
+    ringsInfo = JSON.parse(fileContent);
+    console.log("ringsInfo:", ringsInfo);
+    throw new Error("Not implemented yet.");
 
-  return [isBinary, ringData];
-}
-
-async function main() {
-  const [isBinData, data] = parseArgs();
-  let ringsInfo: RingsInfo;
-
-  const protocolSimulator = new ProtocolSimulator(undefined);
-  if (isBinData) {
-    logDebug("receive binary data, deserializing...");
-    ringsInfo = protocolSimulator.deserialize(data, "");
-    logDebug("deserialize result:", ringsInfo);
+    // const report = await protocolSimulator.simulateAndReport(ringsInfo);
+  } else if (args[0] === "--decode-simulate") {
+    try {
+      const paramInfo: any = JSON.parse(fileContent);
+      const protocolSimulator = new ProtocolSimulator(undefined);
+      const ringsInfo = protocolSimulator.deserialize(paramInfo.bs, paramInfo.txOrigin);
+      console.log("deserialized ringsInfo: ", ringsInfo);
+    } catch (err) {
+      console.log(err);
+    }
   } else {
-    ringsInfo = JSON.parse(data);
-    logDebug("receive ringsInfo data:", ringsInfo);
+    throw new Error("error: invalid argument:" + args);
   }
-
-  logDebug("run simulator and report:");
-  const report = await protocolSimulator.simulateAndReport(ringsInfo);
-  logDebug(report);
 }
 
 main();
diff --git a/src/multihash.ts b/src/multihash.ts
index bf40712..56f7a45 100644
--- a/src/multihash.ts
+++ b/src/multihash.ts
@@ -1,6 +1,6 @@
 import { BigNumber } from "bignumber.js";
 import BN = require("bn.js");
-import promisify = require("es6-promisify");
+import { promisify }  from "es6-promisify";
 import ABI = require("ethereumjs-abi");
 import ethUtil = require("ethereumjs-util");
 import Web3 = require("web3");
diff --git a/testMain.sh b/testMain.sh
new file mode 100755
index 0000000..c5a1755
--- /dev/null
+++ b/testMain.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+cd .
+
+npm start -- --decode-param data/param01.json