diff --git a/monero/account.py b/monero/account.py
index 3997c4a..3f7292f 100644
--- a/monero/account.py
+++ b/monero/account.py
@@ -1,4 +1,3 @@
-import warnings
 from . import prio
 from .transaction import PaymentManager
 
@@ -68,7 +67,7 @@ class Account(object):
             priority=prio.NORMAL, payment_id=None, unlock_time=0,
             relay=True):
         """
-        Sends a transfer. Returns a list of resulting transactions.
+        Sends a transfer. Returns a set of resulting transactions.
 
         :param address: destination :class:`Address <monero.address.Address>` or subtype
         :param amount: amount to send
@@ -82,7 +81,7 @@ class Account(object):
         :param relay: if `True`, the wallet will relay the transaction(s) to the network
                         immediately; when `False`, it will only return the transaction(s)
                         so they might be broadcasted later
-        :rtype: list of :class:`Transaction <monero.transaction.Transaction>`
+        :rtype: set of :class:`Transaction <monero.transaction.Transaction>`
         """
         return self._backend.transfer(
             [(address, amount)],
@@ -96,7 +95,7 @@ class Account(object):
             priority=prio.NORMAL, payment_id=None, unlock_time=0,
             relay=True):
         """
-        Sends a batch of transfers. Returns a list of resulting transactions.
+        Sends a batch of transfers. Returns a set of resulting transactions.
 
         :param destinations: a list of destination and amount pairs:
                     [(:class:`Address <monero.address.Address>`, `Decimal`), ...]
@@ -110,7 +109,7 @@ class Account(object):
         :param relay: if `True`, the wallet will relay the transaction(s) to the network
                         immediately; when `False`, it will only return the transaction(s)
                         so they might be broadcasted later
-        :rtype: list of :class:`Transaction <monero.transaction.Transaction>`
+        :rtype: set of :class:`Transaction <monero.transaction.Transaction>`
         """
         return self._backend.transfer(
             destinations,
diff --git a/monero/backends/jsonrpc.py b/monero/backends/jsonrpc.py
index a6f9948..df97803 100644
--- a/monero/backends/jsonrpc.py
+++ b/monero/backends/jsonrpc.py
@@ -10,7 +10,9 @@ from ..account import Account
 from ..address import address, Address, SubAddress
 from ..numbers import from_atomic, to_atomic, PaymentID
 from ..seed import Seed
-from ..transaction import Transaction, IncomingPayment, OutgoingPayment
+from ..transaction import (
+    SignedTransaction, UnsignedTransaction, MultisigTransaction, TransactionSet,
+    IncomingPayment, OutgoingPayment )
 
 _log = logging.getLogger(__name__)
 
@@ -51,7 +53,7 @@ class JSONRPCDaemon(object):
         res = self.raw_request('/get_transaction_pool', {})
         txs = []
         for tx in res.get('transactions', []):
-            txs.append(Transaction(
+            txs.append(SignedTransaction(
                 hash=tx['id_hash'],
                 fee=from_atomic(tx['fee']),
                 timestamp=datetime.fromtimestamp(tx['receive_time'])))
@@ -242,7 +244,7 @@ class JSONRPCWallet(object):
             'amount': from_atomic(data['amount']),
             'timestamp': datetime.fromtimestamp(data['timestamp']) if 'timestamp' in data else None,
             'note': data.get('note', None),
-            'transaction': self._tx(data),
+            'transaction': self._tx(data, SignedTransaction),
             'local_address': laddr,
         }
         if 'destinations' in data:
@@ -259,8 +261,8 @@ class JSONRPCWallet(object):
     def _outpayment(self, data):
         return OutgoingPayment(**self._paymentdict(data))
 
-    def _tx(self, data):
-        return Transaction(**{
+    def _tx(self, data, klass):
+        return klass(**{
             'hash': data.get('txid', data.get('tx_hash')),
             'fee': from_atomic(data['fee']) if 'fee' in data else None,
             'key': data.get('key'),
@@ -311,7 +313,23 @@ class JSONRPCWallet(object):
                 'tx_hash_list', 'amount_list', 'fee_list', 'tx_key_list', 'tx_blob_list')]))]
         for d in _pertx:
             d['payment_id'] = payment_id
-        return [self._tx(data) for data in _pertx]
+        result = TransactionSet()
+        klass = SignedTransaction
+        try:
+            if _transfers['unsigned_txset']:
+                result.unsigned_txset = _transfers['unsigned_txset']
+                klass = UnsignedTransaction
+        except KeyError:
+            pass
+        try:
+            if _transfers['multisig_txset']:
+                result.multisig_txset = _transfers['multisig_txset']
+                klass = MultisigTransaction
+        except KeyError:
+            pass
+        for data in _pertx:
+            result.add(self._tx(data, klass))
+        return result
 
     def raw_request(self, method, params=None, squelch_error_logging=False):
         hdr = {'Content-Type': 'application/json'}
diff --git a/monero/daemon.py b/monero/daemon.py
index 0cb2486..6d4dc32 100644
--- a/monero/daemon.py
+++ b/monero/daemon.py
@@ -1,3 +1,6 @@
+from .exceptions import TransactionNotSigned
+from .transaction import SignedTransaction
+
 class Daemon(object):
     """Monero daemon.
 
@@ -28,10 +31,12 @@ class Daemon(object):
         """
         Sends a transaction generated by a :class:`Wallet <monero.wallet.Wallet>`.
 
-        :param tx: :class:`Transaction <monero.transaction.Transaction>`
+        :param tx: :class:`SignedTransaction <monero.transaction.SignedTransaction>`
         :param relay: whether to relay the transaction to peers. If `False`, the daemon will have
                 to mine the transaction itself in order to have it included in the blockchain.
         """
+        if not isinstance(tx, SignedTransaction):
+            raise TransactionNotSigned(tx.hash)
         return self._backend.send_transaction(tx.blob, relay=relay)
 
     def mempool(self):
diff --git a/monero/exceptions.py b/monero/exceptions.py
index 389fbb5..25d811c 100644
--- a/monero/exceptions.py
+++ b/monero/exceptions.py
@@ -41,3 +41,6 @@ class SignatureCheckFailed(MoneroException):
 
 class WalletIsNotDeterministic(MoneroException):
     pass
+
+class TransactionNotSigned(TransactionBroadcastError):
+    pass
diff --git a/monero/transaction.py b/monero/transaction.py
index 20e9bcf..cdcabaf 100644
--- a/monero/transaction.py
+++ b/monero/transaction.py
@@ -71,6 +71,7 @@ class Transaction(object):
     key = None
     blob = None
     confirmations = None
+    signed = False
 
     def __init__(self, **kwargs):
         self.hash = kwargs.get('hash', self.hash)
@@ -85,6 +86,27 @@ class Transaction(object):
         return self.hash
 
 
+class UnsignedTransaction(Transaction):
+    pass
+
+
+class SignedTransaction(Transaction):
+    signed = True
+
+
+class MultisigTransaction(Transaction):
+    pass
+
+
+class TransactionSet(set):
+    unsigned_txset = None
+    multisig_txset = None
+
+    @property
+    def signed(self):
+        return self.unsigned_txset is None and self.multisig_txset is None
+
+
 if sys.version_info < (3,):
     _str_types = (str, bytes, unicode)
 else:
diff --git a/monero/wallet.py b/monero/wallet.py
index 74f8d37..ea2a288 100644
--- a/monero/wallet.py
+++ b/monero/wallet.py
@@ -188,7 +188,7 @@ class Wallet(object):
             priority=prio.NORMAL, payment_id=None, unlock_time=0,
             relay=True):
         """
-        Sends a transfer from the default account. Returns a list of resulting transactions.
+        Sends a transfer from the default account. Returns a set of resulting transactions.
 
         :param address: destination :class:`Address <monero.address.Address>` or subtype
         :param amount: amount to send
@@ -202,7 +202,7 @@ class Wallet(object):
         :param relay: if `True`, the wallet will relay the transaction(s) to the network
                         immediately; when `False`, it will only return the transaction(s)
                         so they might be broadcasted later
-        :rtype: list of :class:`Transaction <monero.transaction.Transaction>`
+        :rtype: set of :class:`Transaction <monero.transaction.Transaction>`
         """
         return self.accounts[0].transfer(
                 address,
@@ -216,7 +216,7 @@ class Wallet(object):
             priority=prio.NORMAL, payment_id=None, unlock_time=0,
             relay=True):
         """
-        Sends a batch of transfers from the default account. Returns a list of resulting
+        Sends a batch of transfers from the default account. Returns a set of resulting
         transactions.
 
         :param destinations: a list of destination and amount pairs: [(address, amount), ...]
@@ -230,7 +230,7 @@ class Wallet(object):
         :param relay: if `True`, the wallet will relay the transaction(s) to the network
                         immediately; when `False`, it will only return the transaction(s)
                         so they might be broadcasted later
-        :rtype: list of :class:`Transaction <monero.transaction.Transaction>`
+        :rtype: set of :class:`Transaction <monero.transaction.Transaction>`
         """
         return self.accounts[0].transfer_multiple(
                 destinations,
diff --git a/tests/test_jsonrpcwallet.py b/tests/test_jsonrpcwallet.py
index 0206e01..4c92fd4 100644
--- a/tests/test_jsonrpcwallet.py
+++ b/tests/test_jsonrpcwallet.py
@@ -5,12 +5,11 @@ try:
     from unittest.mock import patch, Mock
 except ImportError:
     from mock import patch, Mock
-import warnings
 
 from monero.wallet import Wallet
 from monero.address import Address
 from monero.seed import Seed
-from monero.transaction import IncomingPayment, OutgoingPayment, Transaction
+from monero.transaction import IncomingPayment, OutgoingPayment, SignedTransaction
 from monero.backends.jsonrpc import JSONRPCWallet
 
 class SubaddrWalletTestCase(unittest.TestCase):
@@ -260,7 +259,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt, IncomingPayment)
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
             self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIsInstance(pmt.transaction.height, int)
 
@@ -411,7 +410,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt, IncomingPayment)
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
             self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIsInstance(pmt.transaction.height, (int, type(None)))
 
@@ -454,7 +453,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt, IncomingPayment)
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
             self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIs(pmt.transaction.height, None)
 
@@ -495,7 +494,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt, IncomingPayment)
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
 # Fee is not returned by this RPC method!
 #            self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIsInstance(pmt.transaction.height, int)
@@ -539,7 +538,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt, IncomingPayment)
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
 # Fee is not returned by this RPC method!
 #            self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIsInstance(pmt.transaction.height, int)
@@ -709,7 +708,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
             self.assertIsInstance(pmt.timestamp, datetime)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
             self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIsInstance(pmt.transaction.height, int)
 
@@ -889,7 +888,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
             self.assertIsInstance(pmt.timestamp, datetime)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
             self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIsInstance(pmt.transaction.height, (int, type(None)))
 
@@ -921,7 +920,7 @@ class SubaddrWalletTestCase(unittest.TestCase):
             self.assertIsInstance(pmt.local_address, Address)
             self.assertIsInstance(pmt.amount, Decimal)
             self.assertIsInstance(pmt.timestamp, datetime)
-            self.assertIsInstance(pmt.transaction, Transaction)
+            self.assertIsInstance(pmt.transaction, SignedTransaction)
             self.assertIsInstance(pmt.transaction.fee, Decimal)
             self.assertIs(pmt.transaction.height, None)
 
@@ -943,8 +942,11 @@ class SubaddrWalletTestCase(unittest.TestCase):
             '9wFuzNoQDck1pnS9ZhG47kDdLD1BUszSbWpGfWcSRy9m6Npq9NoHWd141KvGag8hu2gajEwzRXJ4iJwmxruv9ofc2CwnYCE',
             3)
         self.assertEqual(len(txns), 1)
-        txn = txns[0]
-        self.assertIsInstance(txn, Transaction)
+        self.assertIsNone(txns.unsigned_txset)
+        self.assertIsNone(txns.multisig_txset)
+        txn = txns.pop()
+        self.assertIsInstance(txn, SignedTransaction)
+        self.assertTrue(txn.signed)
         self.assertIsInstance(txn.fee, Decimal)
         self.assertEqual(txn.hash,
             '401d8021975a0fee16fe84acbfc4d8ba6312e563fa245baba2aac382e787fb60')
diff --git a/utils/pushtx.py b/utils/pushtx.py
index 047e3bc..cde045e 100755
--- a/utils/pushtx.py
+++ b/utils/pushtx.py
@@ -7,7 +7,7 @@ import sys
 
 from monero.backends.jsonrpc import JSONRPCDaemon
 from monero.daemon import Daemon
-from monero.transaction import Transaction
+from monero.transaction import SignedTransaction
 from monero import exceptions
 
 def url_data(url):
@@ -39,7 +39,7 @@ else:
 d = Daemon(JSONRPCDaemon(**args.daemon_rpc_url))
 for name, blob in blobs:
     logging.debug("Sending {}".format(name))
-    tx = Transaction(blob=blob)
+    tx = SignedTransaction(blob=blob)
     try:
         res = d.send_transaction(tx, relay=args.relay)
     except exceptions.TransactionBroadcastError as e: