diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3b97d477..8383e104d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - Remove certain non-essential permissions from certain builds.
 - Add a check for when a tx is included in a block.
+- Implement replay attack protections allowed by EIP 155.
 - Fix bug where sometimes loading account data would fail by querying a future block.
 
 ## 2.14.1 2016-12-20
diff --git a/app/scripts/keyring-controller.js b/app/scripts/keyring-controller.js
index 92429f7f5..c58be0aae 100644
--- a/app/scripts/keyring-controller.js
+++ b/app/scripts/keyring-controller.js
@@ -316,20 +316,16 @@ module.exports = class KeyringController extends EventEmitter {
   //
   // This method signs tx and returns a promise for
   // TX Manager to update the state after signing
-  signTransaction (ethTx, selectedAddress, txId, cb) {
-    try {
-      const address = normalize(selectedAddress)
-      return this.getKeyringForAccount(address)
-      .then((keyring) => {
-        return keyring.signTransaction(address, ethTx)
-      }).then((tx) => {
-        this.emit(`${txId}:signed`, {tx, txId, cb})
-      })
-    } catch (e) {
-      cb(e)
-    }
-  }
 
+  signTransaction (ethTx, selectedAddress, txId) {
+    const address = normalize(selectedAddress)
+    return this.getKeyringForAccount(address)
+    .then((keyring) => {
+      return keyring.signTransaction(address, ethTx)
+    }).then((tx) => {
+      return {tx, txId}
+    })
+  }
   // Add Unconfirmed Message
   // @object msgParams
   // @function cb
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 76ca99b25..555460f3d 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -184,10 +184,23 @@ module.exports = class MetamaskController extends EventEmitter {
       },
       // tx signing
       approveTransaction: this.newUnsignedTransaction.bind(this),
-      signTransaction: (...args) => {
-        this.setupSigningListners(...args)
-        this.txManager.formatTxForSigining(...args)
-        this.sendUpdate()
+      signTransaction: (txParams, cb) => {
+        this.txManager.formatTxForSigining(txParams)
+        .then(({ethTx, address, txId}) => {
+          return this.keyringController.signTransaction(ethTx, address, txId)
+        })
+        .then(({tx, txId}) => {
+          return this.txManager.resolveSignedTransaction({tx, txId})
+        })
+        .then((rawTx) => {
+          cb(null, rawTx)
+          this.sendUpdate()
+          this.txManager.emit(`${txParams.metamaskId}:signingComplete`)
+        })
+        .catch((err) => {
+          console.error(err)
+          cb(err)
+        })
       },
 
       // msg signing
@@ -265,13 +278,6 @@ module.exports = class MetamaskController extends EventEmitter {
     })
   }
 
-  setupSigningListners (txParams) {
-    var txId = txParams.metamaskId
-    // apply event listeners for signing and formating events
-    this.txManager.once(`${txId}:formatted`, this.keyringController.signTransaction.bind(this.keyringController))
-    this.keyringController.once(`${txId}:signed`, this.txManager.resolveSignedTransaction.bind(this.txManager))
-  }
-
   enforceTxValidations (txParams) {
     if (('value' in txParams) && txParams.value.indexOf('-') === 0) {
       const msg = `Invalid transaction value of ${txParams.value} not a positive number.`
@@ -452,7 +458,7 @@ module.exports = class MetamaskController extends EventEmitter {
     return this.state.network
   }
 
-  markAccountsFound(cb) {
+  markAccountsFound (cb) {
     this.configManager.setLostAccounts([])
     this.sendUpdate()
     cb(null, this.getState())
diff --git a/app/scripts/transaction-manager.js b/app/scripts/transaction-manager.js
index fd136a51b..6becfa6d1 100644
--- a/app/scripts/transaction-manager.js
+++ b/app/scripts/transaction-manager.js
@@ -128,7 +128,7 @@ module.exports = class TransactionManager extends EventEmitter {
 
   approveTransaction (txId, cb = warn) {
     this.setTxStatusSigned(txId)
-    cb()
+    this.once(`${txId}:signingComplete`, cb)
   }
 
   cancelTransaction (txId, cb = warn) {
@@ -137,7 +137,7 @@ module.exports = class TransactionManager extends EventEmitter {
   }
 
   // formats txParams so the keyringController can sign it
-  formatTxForSigining (txParams, cb) {
+  formatTxForSigining (txParams) {
     var address = txParams.from
     var metaTx = this.getTx(txParams.metamaskId)
     var gasMultiplier = metaTx.gasMultiplier
@@ -153,9 +153,8 @@ module.exports = class TransactionManager extends EventEmitter {
     txParams.gasLimit = normalize(txParams.gasLimit || txParams.gas)
     txParams.nonce = normalize(txParams.nonce)
     const ethTx = new Transaction(txParams)
-
-    // listener is assigned in metamaskController
-    this.emit(`${txParams.metamaskId}:formatted`, ethTx, address, txParams.metamaskId, cb)
+    var txId = txParams.metamaskId
+    return Promise.resolve({ethTx, address, txId})
   }
 
   // receives a signed tx object and updates the tx hash
@@ -167,7 +166,8 @@ module.exports = class TransactionManager extends EventEmitter {
     metaTx.hash = txHash
     this.updateTx(metaTx)
     var rawTx = ethUtil.bufferToHex(tx.serialize())
-    cb(null, rawTx)
+    return Promise.resolve(rawTx)
+
   }
 
   /*