diff --git a/tests/unit/test_account.py b/tests/unit/test_account.py
index 4e26c68e5..f937a12d5 100644
--- a/tests/unit/test_account.py
+++ b/tests/unit/test_account.py
@@ -3,77 +3,21 @@ from twisted.trial import unittest
 from twisted.internet import defer
 
 from torba.coin.bitcoinsegwit import MainNetLedger
+from torba.baseaccount import KeyChain, SingleKey
 
 
-class TestKeyChain(unittest.TestCase):
-
-    def setUp(self):
-        self.ledger = MainNetLedger({'db': MainNetLedger.database_class(':memory:')})
-        return self.ledger.db.start()
+class TestKeyChainAccount(unittest.TestCase):
 
     @defer.inlineCallbacks
-    def test_address_gap_algorithm(self):
-        account = self.ledger.account_class.generate(self.ledger, u"torba")
-
-        # save records out of order to make sure we're really testing ORDER BY
-        # and not coincidentally getting records in the correct order
-        yield account.receiving.generate_keys(4, 7)
-        yield account.receiving.generate_keys(0, 3)
-        yield account.receiving.generate_keys(8, 11)
-        keys = yield account.receiving.get_addresses(None, True)
-        self.assertEqual(
-            [key['position'] for key in keys],
-            [11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
-        )
-
-        # we have 12, but default gap is 20
-        new_keys = yield account.receiving.ensure_address_gap()
-        self.assertEqual(len(new_keys), 8)
-        keys = yield account.receiving.get_addresses(None, True)
-        self.assertEqual(
-            [key['position'] for key in keys],
-            [19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
-        )
-
-        # case #1: no new addresses needed
-        empty = yield account.receiving.ensure_address_gap()
-        self.assertEqual(len(empty), 0)
-
-        # case #2: only one new addressed needed
-        keys = yield account.receiving.get_addresses(None, True)
-        yield self.ledger.db.set_address_history(keys[19]['address'], 'a:1:')
-        new_keys = yield account.receiving.ensure_address_gap()
-        self.assertEqual(len(new_keys), 1)
-
-        # case #3: 20 addresses needed
-        keys = yield account.receiving.get_addresses(None, True)
-        yield self.ledger.db.set_address_history(keys[0]['address'], 'a:1:')
-        new_keys = yield account.receiving.ensure_address_gap()
-        self.assertEqual(len(new_keys), 20)
-
-    @defer.inlineCallbacks
-    def test_create_usable_address(self):
-        account = self.ledger.account_class.generate(self.ledger, u"torba")
-
-        keys = yield account.receiving.get_addresses(None, True)
-        self.assertEqual(len(keys), 0)
-
-        address = yield account.receiving.get_or_create_usable_address()
-        self.assertIsNotNone(address)
-
-        keys = yield account.receiving.get_addresses(None, True)
-        self.assertEqual(len(keys), 20)
-
-
-class TestAccount(unittest.TestCase):
-
     def setUp(self):
         self.ledger = MainNetLedger({'db': MainNetLedger.database_class(':memory:')})
-        return self.ledger.db.start()
+        yield self.ledger.db.start()
+        self.account = self.ledger.account_class.generate(self.ledger, u"torba")
 
     @defer.inlineCallbacks
     def test_generate_account(self):
-        account = self.ledger.account_class.generate(self.ledger, u"torba")
+        account = self.account
+
         self.assertEqual(account.ledger, self.ledger)
         self.assertIsNotNone(account.seed)
         self.assertEqual(account.public_key.ledger, self.ledger)
@@ -91,13 +35,68 @@ class TestAccount(unittest.TestCase):
         addresses = yield account.change.get_addresses()
         self.assertEqual(len(addresses), 6)
 
+        addresses = yield account.get_addresses()
+        self.assertEqual(len(addresses), 26)
+
+    @defer.inlineCallbacks
+    def test_ensure_address_gap(self):
+        account = self.account
+
+        self.assertIsInstance(account.receiving, KeyChain)
+
+        yield account.receiving.generate_keys(4, 7)
+        yield account.receiving.generate_keys(0, 3)
+        yield account.receiving.generate_keys(8, 11)
+        records = yield account.receiving.get_address_records()
+        self.assertEqual(
+            [r['position'] for r in records],
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
+        )
+
+        # we have 12, but default gap is 20
+        new_keys = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(new_keys), 8)
+        records = yield account.receiving.get_address_records()
+        self.assertEqual(
+            [r['position'] for r in records],
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
+        )
+
+        # case #1: no new addresses needed
+        empty = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(empty), 0)
+
+        # case #2: only one new addressed needed
+        records = yield account.receiving.get_address_records()
+        yield self.ledger.db.set_address_history(records[0]['address'], 'a:1:')
+        new_keys = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(new_keys), 1)
+
+        # case #3: 20 addresses needed
+        yield self.ledger.db.set_address_history(new_keys[0], 'a:1:')
+        new_keys = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(new_keys), 20)
+
+    @defer.inlineCallbacks
+    def test_get_or_create_usable_address(self):
+        account = self.account
+
+        keys = yield account.receiving.get_addresses()
+        self.assertEqual(len(keys), 0)
+
+        address = yield account.receiving.get_or_create_usable_address()
+        self.assertIsNotNone(address)
+
+        keys = yield account.receiving.get_addresses()
+        self.assertEqual(len(keys), 20)
+
     @defer.inlineCallbacks
     def test_generate_account_from_seed(self):
         account = self.ledger.account_class.from_seed(
             self.ledger,
             u"carbon smart garage balance margin twelve chest sword toast envelope bottom stomach ab"
             u"sent",
-            u"torba"
+            u"torba", receiving_gap=3, change_gap=2
         )
         self.assertEqual(
             account.private_key.extended_key_string(),
@@ -112,7 +111,6 @@ class TestAccount(unittest.TestCase):
         address = yield account.receiving.ensure_address_gap()
         self.assertEqual(address[0], b'1PmX9T3sCiDysNtWszJa44SkKcpGc2NaXP')
 
-        self.maxDiff = None
         private_key = yield self.ledger.get_private_key_for_address(b'1PmX9T3sCiDysNtWszJa44SkKcpGc2NaXP')
         self.assertEqual(
             private_key.extended_key_string(),
@@ -131,6 +129,7 @@ class TestAccount(unittest.TestCase):
     @defer.inlineCallbacks
     def test_load_and_save_account(self):
         account_data = {
+            'name': 'My Account',
             'seed':
                 "carbon smart garage balance margin twelve chest sword toast envelope bottom stomac"
                 "h absent",
@@ -141,10 +140,11 @@ class TestAccount(unittest.TestCase):
             'public_key':
                 'xpub661MyMwAqRbcF84AR8yfHoMzf4S2ct6mPJtvBtvNeyN9hBHuZ6uGJszkTSn5fQUCdz3XU17eBzFeAUwV6f'
                 'iW44g14WF52fYC5J483wqQ5ZP',
-            'receiving_gap': 10,
-            'receiving_maximum_use_per_address': 2,
-            'change_gap': 10,
-            'change_maximum_use_per_address': 2
+            'is_hd': True,
+            'receiving_gap': 5,
+            'receiving_maximum_uses_per_address': 2,
+            'change_gap': 5,
+            'change_maximum_uses_per_address': 2
         }
 
         account = self.ledger.account_class.from_dict(self.ledger, account_data)
@@ -152,9 +152,159 @@ class TestAccount(unittest.TestCase):
         yield account.ensure_address_gap()
 
         addresses = yield account.receiving.get_addresses()
-        self.assertEqual(len(addresses), 10)
+        self.assertEqual(len(addresses), 5)
         addresses = yield account.change.get_addresses()
-        self.assertEqual(len(addresses), 10)
+        self.assertEqual(len(addresses), 5)
+
+        self.maxDiff = None
+        account_data['ledger'] = 'btc_mainnet'
+        self.assertDictEqual(account_data, account.to_dict())
+
+
+class TestSingleKeyAccount(unittest.TestCase):
+
+    @defer.inlineCallbacks
+    def setUp(self):
+        self.ledger = MainNetLedger({'db': MainNetLedger.database_class(':memory:')})
+        yield self.ledger.db.start()
+        self.account = self.ledger.account_class.generate(self.ledger, u"torba", is_hd=False)
+
+    @defer.inlineCallbacks
+    def test_generate_account(self):
+        account = self.account
+
+        self.assertEqual(account.ledger, self.ledger)
+        self.assertIsNotNone(account.seed)
+        self.assertEqual(account.public_key.ledger, self.ledger)
+        self.assertEqual(account.private_key.public_key, account.public_key)
+
+        addresses = yield account.receiving.get_addresses()
+        self.assertEqual(len(addresses), 0)
+        addresses = yield account.change.get_addresses()
+        self.assertEqual(len(addresses), 0)
+
+        yield account.ensure_address_gap()
+
+        addresses = yield account.receiving.get_addresses()
+        self.assertEqual(len(addresses), 1)
+        self.assertEqual(addresses[0], account.public_key.address)
+        addresses = yield account.change.get_addresses()
+        self.assertEqual(len(addresses), 1)
+        self.assertEqual(addresses[0], account.public_key.address)
+
+        addresses = yield account.get_addresses()
+        self.assertEqual(len(addresses), 1)
+        self.assertEqual(addresses[0], account.public_key.address)
+
+    @defer.inlineCallbacks
+    def test_ensure_address_gap(self):
+        account = self.account
+
+        self.assertIsInstance(account.receiving, SingleKey)
+        addresses = yield account.receiving.get_addresses()
+        self.assertEqual(addresses, [])
+
+        # we have 12, but default gap is 20
+        new_keys = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(new_keys), 1)
+        self.assertEqual(new_keys[0], account.public_key.address)
+        records = yield account.receiving.get_address_records()
+        self.assertEqual(records, [{
+            'position': 0, 'address': account.public_key.address, 'used_times': 0
+        }])
+
+        # case #1: no new addresses needed
+        empty = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(empty), 0)
+
+        # case #2: after use, still no new address needed
+        records = yield account.receiving.get_address_records()
+        yield self.ledger.db.set_address_history(records[0]['address'], 'a:1:')
+        empty = yield account.receiving.ensure_address_gap()
+        self.assertEqual(len(empty), 0)
+
+    @defer.inlineCallbacks
+    def test_get_or_create_usable_address(self):
+        account = self.account
+
+        addresses = yield account.receiving.get_addresses()
+        self.assertEqual(len(addresses), 0)
+
+        address1 = yield account.receiving.get_or_create_usable_address()
+        self.assertIsNotNone(address1)
+
+        yield self.ledger.db.set_address_history(address1, 'a:1:b:2:c:3:')
+        records = yield account.receiving.get_address_records()
+        self.assertEqual(records[0]['used_times'], 3)
+
+        address2 = yield account.receiving.get_or_create_usable_address()
+        self.assertEqual(address1, address2)
+
+        keys = yield account.receiving.get_addresses()
+        self.assertEqual(len(keys), 1)
+
+    @defer.inlineCallbacks
+    def test_generate_account_from_seed(self):
+        account = self.ledger.account_class.from_seed(
+            self.ledger,
+            u"carbon smart garage balance margin twelve chest sword toast envelope bottom stomach ab"
+            u"sent",
+            u"torba",
+            is_hd=False
+        )
+        self.assertEqual(
+            account.private_key.extended_key_string(),
+            b'xprv9s21ZrQH143K2dyhK7SevfRG72bYDRNv25yKPWWm6dqApNxm1Zb1m5gGcBWYfbsPjTr2v5joit8Af2Zp5P'
+            b'6yz3jMbycrLrRMpeAJxR8qDg8'
+        )
+        self.assertEqual(
+            account.public_key.extended_key_string(),
+            b'xpub661MyMwAqRbcF84AR8yfHoMzf4S2ct6mPJtvBtvNeyN9hBHuZ6uGJszkTSn5fQUCdz3XU17eBzFeAUwV6f'
+            b'iW44g14WF52fYC5J483wqQ5ZP'
+        )
+        address = yield account.receiving.ensure_address_gap()
+        self.assertEqual(address[0], account.public_key.address)
+
+        private_key = yield self.ledger.get_private_key_for_address(address[0])
+        self.assertEqual(
+            private_key.extended_key_string(),
+            b'xprv9s21ZrQH143K2dyhK7SevfRG72bYDRNv25yKPWWm6dqApNxm1Zb1m5gGcBWYfbsPjTr2v5joit8Af2Zp5P'
+            b'6yz3jMbycrLrRMpeAJxR8qDg8'
+        )
+
+        invalid_key = yield self.ledger.get_private_key_for_address(b'BcQjRlhDOIrQez1WHfz3whnB33Bp34sUgX')
+        self.assertIsNone(invalid_key)
+
+        self.assertEqual(
+            hexlify(private_key.wif()),
+            b'1c2423f3dc6087d9683f73a684935abc0ccd8bc26370588f56653128c6a6f0bf7c01'
+        )
+
+    @defer.inlineCallbacks
+    def test_load_and_save_account(self):
+        account_data = {
+            'name': 'My Account',
+            'seed':
+                "carbon smart garage balance margin twelve chest sword toast envelope bottom stomac"
+                "h absent",
+            'encrypted': False,
+            'private_key':
+                'xprv9s21ZrQH143K2dyhK7SevfRG72bYDRNv25yKPWWm6dqApNxm1Zb1m5gGcBWYfbsPjTr2v5joit8Af2Zp5P'
+                '6yz3jMbycrLrRMpeAJxR8qDg8',
+            'public_key':
+                'xpub661MyMwAqRbcF84AR8yfHoMzf4S2ct6mPJtvBtvNeyN9hBHuZ6uGJszkTSn5fQUCdz3XU17eBzFeAUwV6f'
+                'iW44g14WF52fYC5J483wqQ5ZP',
+            'is_hd': False
+        }
+
+        account = self.ledger.account_class.from_dict(self.ledger, account_data)
+
+        yield account.ensure_address_gap()
+
+        addresses = yield account.receiving.get_addresses()
+        self.assertEqual(len(addresses), 1)
+        addresses = yield account.change.get_addresses()
+        self.assertEqual(len(addresses), 1)
 
         self.maxDiff = None
         account_data['ledger'] = 'btc_mainnet'
diff --git a/torba/baseaccount.py b/torba/baseaccount.py
index f8d46dd03..ec29a184a 100644
--- a/torba/baseaccount.py
+++ b/torba/baseaccount.py
@@ -7,30 +7,60 @@ from torba.bip32 import PrivateKey, PubKey, from_extended_key_string
 from torba.hash import double_sha256, aes_encrypt, aes_decrypt
 
 
-class KeyChain:
+class KeyManager(object):
 
-    def __init__(self, account, parent_key, chain_number, gap, maximum_use_per_address):
-        # type: ('BaseAccount', PubKey, int, int, int) -> None
+    __slots__ = 'account', 'public_key', 'chain_number'
+
+    def __init__(self, account, public_key, chain_number):
         self.account = account
-        self.db = account.ledger.db
-        self.main_key = parent_key.child(chain_number)
+        self.public_key = public_key
         self.chain_number = chain_number
-        self.gap = gap
-        self.maximum_use_per_address = maximum_use_per_address
 
-    def get_addresses(self, limit=None, details=False):
-        return self.db.get_addresses(self.account, self.chain_number, limit, details)
+    @property
+    def db(self):
+        return self.account.ledger.db
 
-    def get_usable_addresses(self, limit=None):
-        return self.db.get_usable_addresses(
-            self.account, self.chain_number, self.maximum_use_per_address, limit
+    def _query_addresses(self, limit=None, max_used_times=None, order_by=None):
+        return self.db.get_addresses(
+            self.account, self.chain_number, limit, max_used_times, order_by
         )
 
+    def ensure_address_gap(self):  # type: () -> defer.Deferred
+        raise NotImplementedError
+
+    def get_address_records(self, limit=None, only_usable=False):  # type: (int, bool) -> defer.Deferred
+        raise NotImplementedError
+
+    @defer.inlineCallbacks
+    def get_addresses(self, limit=None, only_usable=False):  # type: (int, bool) -> defer.Deferred
+        records = yield self.get_address_records(limit=limit, only_usable=only_usable)
+        defer.returnValue([r['address'] for r in records])
+
+    @defer.inlineCallbacks
+    def get_or_create_usable_address(self):  # type: () -> defer.Deferred
+        addresses = yield self.get_addresses(limit=1, only_usable=True)
+        if addresses:
+            defer.returnValue(addresses[0])
+        addresses = yield self.ensure_address_gap()
+        defer.returnValue(addresses[0])
+
+
+class KeyChain(KeyManager):
+    """ Implements simple version of Bitcoin Hierarchical Deterministic key management. """
+
+    __slots__ = 'gap', 'maximum_uses_per_address'
+
+    def __init__(self, account, root_public_key, chain_number, gap, maximum_uses_per_address):
+        # type: ('BaseAccount', PubKey, int, int, int) -> None
+        super(KeyChain, self).__init__(account, root_public_key.child(chain_number), chain_number)
+        self.gap = gap
+        self.maximum_uses_per_address = maximum_uses_per_address
+
     @defer.inlineCallbacks
     def generate_keys(self, start, end):
         new_keys = []
         for index in range(start, end+1):
-            new_keys.append((index, self.main_key.child(index)))
+            new_keys.append((index, self.public_key.child(index)))
         yield self.db.add_keys(
             self.account, self.chain_number, new_keys
         )
@@ -38,7 +68,7 @@ class KeyChain:
 
     @defer.inlineCallbacks
     def ensure_address_gap(self):
-        addresses = yield self.get_addresses(self.gap, True)
+        addresses = yield self._query_addresses(self.gap, None, "position DESC")
 
         existing_gap = 0
         for address in addresses:
@@ -55,13 +85,34 @@ class KeyChain:
         new_keys = yield self.generate_keys(start, end-1)
         defer.returnValue(new_keys)
 
+    def get_address_records(self, limit=None, only_usable=False):
+        return self._query_addresses(
+            limit, self.maximum_uses_per_address if only_usable else None,
+            "used_times ASC, position ASC"
+        )
+
+
+class SingleKey(KeyManager):
+    """ Single Key manager always returns the same address for all operations. """
+
+    __slots__ = ()
+
+    def __init__(self, account, root_public_key, chain_number):
+        # type: ('BaseAccount', PubKey) -> None
+        super(SingleKey, self).__init__(account, root_public_key, chain_number)
+
     @defer.inlineCallbacks
-    def get_or_create_usable_address(self):
-        addresses = yield self.get_usable_addresses(1)
-        if addresses:
-            defer.returnValue(addresses[0])
-        addresses = yield self.ensure_address_gap()
-        defer.returnValue(addresses[0])
+    def ensure_address_gap(self):
+        exists = yield self.get_address_records()
+        if not exists:
+            yield self.db.add_keys(
+                self.account, self.chain_number, [(0, self.public_key)]
+            )
+            defer.returnValue([self.public_key.address])
+        defer.returnValue([])
+
+    def get_address_records(self, **kwargs):
+        return self._query_addresses()
 
 
 class BaseAccount(object):
@@ -70,34 +121,43 @@ class BaseAccount(object):
     private_key_class = PrivateKey
     public_key_class = PubKey
 
-    def __init__(self, ledger, seed, encrypted, private_key,
+    def __init__(self, ledger, name, seed, encrypted, is_hd, private_key,
                  public_key, receiving_gap=20, change_gap=6,
-                 receiving_maximum_use_per_address=2, change_maximum_use_per_address=2):
-        # type: (torba.baseledger.BaseLedger, str, bool, PrivateKey, PubKey, int, int, int, int) -> None
+                 receiving_maximum_uses_per_address=2, change_maximum_uses_per_address=2):
+        # type: (torba.baseledger.BaseLedger, str, str, bool, bool, PrivateKey, PubKey, int, int, int, int) -> None
         self.ledger = ledger
+        self.name = name
         self.seed = seed
         self.encrypted = encrypted
         self.private_key = private_key
         self.public_key = public_key
-        self.receiving, self.change = self.keychains = (
-            KeyChain(self, public_key, 0, receiving_gap, receiving_maximum_use_per_address),
-            KeyChain(self, public_key, 1, change_gap, change_maximum_use_per_address)
-        )
+        if is_hd:
+            receiving, change = self.keychains = (
+                KeyChain(self, public_key, 0, receiving_gap, receiving_maximum_uses_per_address),
+                KeyChain(self, public_key, 1, change_gap, change_maximum_uses_per_address)
+            )
+        else:
+            self.keychains = SingleKey(self, public_key, 0),
+            receiving = change = self.keychains[0]
+        self.receiving = receiving  # type: KeyManager
+        self.change = change  # type: KeyManager
         ledger.add_account(self)
 
     @classmethod
-    def generate(cls, ledger, password):  # type: (torba.baseledger.BaseLedger, str) -> BaseAccount
+    def generate(cls, ledger, password, **kwargs):  # type: (torba.baseledger.BaseLedger, str) -> BaseAccount
         seed = cls.mnemonic_class().make_seed()
-        return cls.from_seed(ledger, seed, password)
+        return cls.from_seed(ledger, seed, password, **kwargs)
 
     @classmethod
-    def from_seed(cls, ledger, seed, password):
+    def from_seed(cls, ledger, seed, password, is_hd=True, **kwargs):
         # type: (torba.baseledger.BaseLedger, str, str) -> BaseAccount
         private_key = cls.get_private_key_from_seed(ledger, seed, password)
         return cls(
-            ledger=ledger, seed=seed, encrypted=False,
+            ledger=ledger, name='Account #{}'.format(private_key.public_key.address),
+            seed=seed, encrypted=False, is_hd=is_hd,
             private_key=private_key,
-            public_key=private_key.public_key
+            public_key=private_key.public_key,
+            **kwargs
         )
 
     @classmethod
@@ -109,38 +169,60 @@ class BaseAccount(object):
 
     @classmethod
     def from_dict(cls, ledger, d):  # type: (torba.baseledger.BaseLedger, Dict) -> BaseAccount
-        if not d['encrypted']:
+        if not d['encrypted'] and d['private_key']:
             private_key = from_extended_key_string(ledger, d['private_key'])
             public_key = private_key.public_key
         else:
             private_key = d['private_key']
             public_key = from_extended_key_string(ledger, d['public_key'])
-        return cls(
+
+        kwargs = dict(
             ledger=ledger,
+            name=d['name'],
             seed=d['seed'],
             encrypted=d['encrypted'],
             private_key=private_key,
             public_key=public_key,
-            receiving_gap=d['receiving_gap'],
-            change_gap=d['change_gap'],
-            receiving_maximum_use_per_address=d['receiving_maximum_use_per_address'],
-            change_maximum_use_per_address=d['change_maximum_use_per_address']
+            is_hd=False
         )
 
+        if d['is_hd']:
+            kwargs.update(dict(
+                receiving_gap=d['receiving_gap'],
+                change_gap=d['change_gap'],
+                receiving_maximum_uses_per_address=d['receiving_maximum_uses_per_address'],
+                change_maximum_uses_per_address=d['change_maximum_uses_per_address'],
+                is_hd=True
+            ))
+
+        return cls(**kwargs)
+
     def to_dict(self):
-        return {
+        private_key = self.private_key
+        if not self.encrypted and self.private_key:
+            private_key = self.private_key.extended_key_string().decode()
+
+        d = {
             'ledger': self.ledger.get_id(),
+            'name': self.name,
             'seed': self.seed,
             'encrypted': self.encrypted,
-            'private_key': self.private_key if self.encrypted else
-                           self.private_key.extended_key_string().decode(),
+            'private_key': private_key,
             'public_key': self.public_key.extended_key_string().decode(),
-            'receiving_gap': self.receiving.gap,
-            'change_gap': self.change.gap,
-            'receiving_maximum_use_per_address': self.receiving.maximum_use_per_address,
-            'change_maximum_use_per_address': self.change.maximum_use_per_address
+            'is_hd': False
         }
 
+        if isinstance(self.receiving, KeyChain) and isinstance(self.change, KeyChain):
+            d.update({
+                'receiving_gap': self.receiving.gap,
+                'change_gap': self.change.gap,
+                'receiving_maximum_uses_per_address': self.receiving.maximum_uses_per_address,
+                'change_maximum_uses_per_address': self.change.maximum_uses_per_address,
+                'is_hd': True
+            })
+
+        return d
+
     def decrypt(self, password):
         assert self.encrypted, "Key is not encrypted."
         secret = double_sha256(password)
@@ -163,18 +245,29 @@ class BaseAccount(object):
             addresses.extend(new_addresses)
         defer.returnValue(addresses)
 
-    def get_addresses(self, limit=None, details=False):
-        return self.ledger.db.get_addresses(self, None, limit, details)
+    @defer.inlineCallbacks
+    def get_addresses(self, limit=None, max_used_times=None):  # type: (int, int) -> defer.Deferred
+        records = yield self.get_address_records(limit, max_used_times)
+        defer.returnValue([r['address'] for r in records])
 
-    def get_unused_addresses(self):
-        return self.ledger.db.get_unused_addresses(self, None)
+    def get_address_records(self, limit=None, max_used_times=None):  # type: (int, int) -> defer.Deferred
+        return self.ledger.db.get_addresses(self, None, limit, max_used_times)
 
     def get_private_key(self, chain, index):
         assert not self.encrypted, "Cannot get private key on encrypted wallet account."
-        return self.private_key.child(chain).child(index)
+        if isinstance(self.receiving, SingleKey):
+            return self.private_key
+        else:
+            return self.private_key.child(chain).child(index)
 
-    def get_balance(self, **constraints):
-        return self.ledger.db.get_balance_for_account(self, **constraints)
+    def get_balance(self, confirmations, **constraints):
+        if confirmations == 0:
+            return self.ledger.db.get_balance_for_account(self, **constraints)
+        else:
+            height = self.ledger.headers.height - (confirmations-1)
+            return self.ledger.db.get_balance_for_account(
+                self, height__lte=height, height__not=-1, **constraints
+            )
 
     def get_unspent_outputs(self, **constraints):
         return self.ledger.db.get_utxos_for_account(self, **constraints)
diff --git a/torba/baseledger.py b/torba/baseledger.py
index 339b111ef..fba46c48b 100644
--- a/torba/baseledger.py
+++ b/torba/baseledger.py
@@ -238,7 +238,7 @@ class BaseLedger(six.with_metaclass(LedgerRegistry)):
         # need to update anyways. Continue to get history and create more addresses until
         # all missing addresses are created and history for them is fully restored.
         yield account.ensure_address_gap()
-        addresses = yield account.get_unused_addresses()
+        addresses = yield account.get_addresses(max_used_times=0)
         while addresses:
             yield defer.DeferredList([
                 self.update_history(a) for a in addresses