diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index fd07a46b..6701fc81 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -1324,10 +1324,16 @@ MTX.fromRaw = function fromRaw(data, enc) {
  * @see TX.fromExtended
  */
 
-MTX.fromExtended = function fromExtended(data, enc) {
+MTX.fromExtended = function fromExtended(data, saveCoins, enc) {
+  if (typeof saveCoins === 'string') {
+    enc = saveCoins;
+    saveCoins = false;
+  }
+
   if (typeof data === 'string')
     data = new Buffer(data, enc);
-  return new MTX().fromExtended(data)._mutable();
+
+  return new MTX().fromExtended(data, saveCoins)._mutable();
 };
 
 /**
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 3a5c610c..d13a2dd9 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -50,6 +50,7 @@ function Wallet(db, options) {
 
   this.db = db;
   this.network = db.network;
+  this.workerPool = db.workerPool;
   this.writeLock = new bcoin.locker(this);
   this.fillLock = new bcoin.locker(this);
 
@@ -1142,17 +1143,16 @@ Wallet.prototype.scriptInputs = function scriptInputs(tx, callback) {
  * Build input scripts and sign inputs for a transaction. Only attempts
  * to build/sign inputs that are redeemable by this wallet.
  * @param {MTX} tx
- * @param {Number?} index - Index of input. If not present,
+ * @param {Object|String|Buffer} options - Options or passphrase.
+ * @param {Number?} options.index - Index of input. If not present,
  * it will attempt to build and sign all redeemable inputs.
- * @param {SighashType?} type
+ * @param {SighashType?} options.type
  * @param {Function} callback - Returns [Error, Number] (total number
  * of inputs scripts built and signed).
  */
 
 Wallet.prototype.sign = function sign(tx, options, callback) {
   var self = this;
-  var total = 0;
-  var i, address, key;
 
   if (typeof options === 'function') {
     callback = options;
@@ -1170,19 +1170,62 @@ Wallet.prototype.sign = function sign(tx, options, callback) {
       if (err)
         return callback(err);
 
-      for (i = 0; i < addresses.length; i++) {
-        address = addresses[i];
-        key = master.deriveAccount44(address.account);
-        key = key.derive(address.change).derive(address.index);
-        assert(utils.equal(key.getPublicKey(), address.key));
-        total += address.sign(tx, key, options.index, options.type);
-      }
-
-      return callback(null, total);
+      self._sign(addresses, master, tx, options.index, options.type, callback);
     });
   });
 };
 
+/**
+ * Sign a transaction.
+ * @param {KeyRing[]} addresses
+ * @param {HDPrivateKey} master
+ * @param {MTX} tx
+ * @param {Number?} index
+ * @param {SighashType?} type
+ */
+
+Wallet.sign = function sign(addresses, master, tx, index, type) {
+  var total = 0;
+  var i, address, key;
+
+  for (i = 0; i < addresses.length; i++) {
+    address = addresses[i];
+    key = master.deriveAccount44(address.account);
+    key = key.derive(address.change).derive(address.index);
+    assert(utils.equal(key.getPublicKey(), address.key));
+    total += address.sign(tx, key, index, type);
+  }
+
+  return total;
+};
+
+/**
+ * Sign a transaction asynchronously.
+ * @param {KeyRing[]} addresses
+ * @param {HDPrivateKey} master
+ * @param {MTX} tx
+ * @param {Number?} index
+ * @param {SighashType?} type
+ * @param {Function} callback - Returns [Error, Number] (total number
+ * of inputs scripts built and signed).
+ */
+
+Wallet.prototype._sign = function _sign(addresses, master, tx, index, type, callback) {
+  var result;
+
+  if (!this.workerPool) {
+    callback = utils.asyncify(callback);
+    try {
+      result = Wallet.sign(addresses, master, tx, index, type);
+    } catch (e) {
+      return callback(e);
+    }
+    return callback(null, result);
+  }
+
+  this.workerPool.sign(addresses, master, tx, index, type, callback);
+};
+
 /**
  * Fill transaction with coins (accesses db).
  * @param {TX} tx
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index a457102b..bdac4d7d 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -51,6 +51,7 @@ function WalletDB(options) {
   this.fees = options.fees;
   this.logger = options.logger || bcoin.defaultLogger;
   this.batches = {};
+  this.workerPool = null;
 
   // We need one read lock for `get` and `create`.
   // It will hold locks specific to wallet ids.
@@ -72,6 +73,9 @@ function WalletDB(options) {
     useFilter: true
   });
 
+  if (bcoin.useWorkers)
+    this.workerPool = new bcoin.workers();
+
   this.watchers = {};
 
   this._init();