1 files changed, 3 insertions, 13 deletions
diff --git a/packages/contracts/src/utils/transaction_factory.ts b/packages/contracts/src/utils/transaction_factory.ts
index 1c1029d62..7aaf3691c 100644
--- a/packages/contracts/src/utils/transaction_factory.ts
+++ b/packages/contracts/src/utils/transaction_factory.ts
@@ -1,14 +1,9 @@
-import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
+import { crypto, EIP712Schema, EIP712Utils, generatePseudoRandomSalt } from '@0xproject/order-utils';
 import { SignatureType } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
-import * as _ from 'lodash';
 
-import { crypto } from './crypto';
-import { EIP712Utils } from './eip712_utils';
-import { orderUtils } from './order_utils';
 import { signingUtils } from './signing_utils';
-import { EIP712Schema, SignatureType, SignedTransaction } from './types';
+import { SignedTransaction } from './types';
 
 const EIP712_EXECUTE_TRANSACTION_SCHEMA: EIP712Schema = {
     name: 'ExecuteTransaction',
@@ -30,20 +25,15 @@ export class TransactionFactory {
     }
     public newSignedTransaction(data: string, signatureType: SignatureType = SignatureType.EthSign): SignedTransaction {
         const executeTransactionSchemaHashBuff = EIP712Utils.compileSchema(EIP712_EXECUTE_TRANSACTION_SCHEMA);
-
         const salt = generatePseudoRandomSalt();
         const dataHash = crypto.solSHA3([ethUtil.toBuffer(data)]);
-
         const executeTransactionDataHash = crypto.solSHA3([
             executeTransactionSchemaHashBuff,
             salt,
             EIP712Utils.pad32Buffer(this._signerBuff),
             dataHash,
         ]);
-
-        const executeTransactionMessageHex = `0x${executeTransactionDataHash.toString('hex')}`;
-
-        const txHash = EIP712Utils.createEIP712Message(executeTransactionMessageHex, this._exchangeAddress);
+        const txHash = EIP712Utils.createEIP712Message(executeTransactionDataHash, this._exchangeAddress);
         const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
         const signedTx = {
             exchangeAddress: this._exchangeAddress,