diff --git a/tests/unit/test_wallet.py b/tests/unit/test_wallet.py
index 86521fdd5..5ca3bd904 100644
--- a/tests/unit/test_wallet.py
+++ b/tests/unit/test_wallet.py
@@ -1,3 +1,4 @@
+import tempfile
 from twisted.trial import unittest
 
 from torba.coin.bitcoinsegwit import MainNetLedger as BTCLedger
@@ -36,11 +37,11 @@ class TestWalletCreation(unittest.TestCase):
                         "h absent",
                     'encrypted': False,
                     'private_key':
-                        b'xprv9s21ZrQH143K2dyhK7SevfRG72bYDRNv25yKPWWm6dqApNxm1Zb1m5gGcBWYfbsPjTr2v5joit8Af2Zp5P'
-                        b'6yz3jMbycrLrRMpeAJxR8qDg8',
+                        'xprv9s21ZrQH143K2dyhK7SevfRG72bYDRNv25yKPWWm6dqApNxm1Zb1m5gGcBWYfbsPjTr2v5joit8Af2Zp5P'
+                        '6yz3jMbycrLrRMpeAJxR8qDg8',
                     'public_key':
-                        b'xpub661MyMwAqRbcF84AR8yfHoMzf4S2ct6mPJtvBtvNeyN9hBHuZ6uGJszkTSn5fQUCdz3XU17eBzFeAUwV6f'
-                        b'iW44g14WF52fYC5J483wqQ5ZP',
+                        'xpub661MyMwAqRbcF84AR8yfHoMzf4S2ct6mPJtvBtvNeyN9hBHuZ6uGJszkTSn5fQUCdz3XU17eBzFeAUwV6f'
+                        'iW44g14WF52fYC5J483wqQ5ZP',
                     'receiving_gap': 10,
                     'receiving_maximum_use_per_address': 2,
                     'change_gap': 10,
@@ -57,3 +58,24 @@ class TestWalletCreation(unittest.TestCase):
         self.assertIsInstance(account, BTCLedger.account_class)
         self.maxDiff = None
         self.assertDictEqual(wallet_dict, wallet.to_dict())
+
+    def test_read_write(self):
+        manager = WalletManager()
+        config = {'wallet_path': '/tmp/wallet'}
+        ledger = manager.get_or_create_ledger(BTCLedger.get_id(), config)
+
+        with tempfile.NamedTemporaryFile(suffix='.json') as wallet_file:
+            wallet_file.write(b'{}')
+            wallet_file.seek(0)
+
+            # create and write wallet to a file
+            wallet_storage = WalletStorage(wallet_file.name)
+            wallet = Wallet.from_storage(wallet_storage, manager)
+            account = wallet.generate_account(ledger)
+            wallet.save()
+
+            # read wallet from file
+            wallet_storage = WalletStorage(wallet_file.name)
+            wallet = Wallet.from_storage(wallet_storage, manager)
+
+            self.assertEqual(account.public_key.address, wallet.default_account.public_key.address)
diff --git a/torba/baseaccount.py b/torba/baseaccount.py
index f753732df..d2a5b0c82 100644
--- a/torba/baseaccount.py
+++ b/torba/baseaccount.py
@@ -133,8 +133,8 @@ class BaseAccount:
             'seed': self.seed,
             'encrypted': self.encrypted,
             'private_key': self.private_key if self.encrypted else
-                           self.private_key.extended_key_string(),
-            'public_key': self.public_key.extended_key_string(),
+                           self.private_key.extended_key_string().decode(),
+            '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,
diff --git a/torba/baseledger.py b/torba/baseledger.py
index 072825b49..2e9e53463 100644
--- a/torba/baseledger.py
+++ b/torba/baseledger.py
@@ -2,7 +2,7 @@ import os
 import six
 import hashlib
 from binascii import hexlify, unhexlify
-from typing import Dict, Type
+from typing import Dict, Type, Iterable, Generator
 from operator import itemgetter
 
 from twisted.internet import defer
@@ -126,6 +126,16 @@ class BaseLedger(six.with_metaclass(LedgerRegistry)):
     def get_unspent_outputs(self, account):
         return self.db.get_utxos(account, self.transaction_class.output_class)
 
+    @defer.inlineCallbacks
+    def get_effective_amount_estimators(self, funding_accounts):
+        # type: (Iterable[baseaccount.BaseAccount]) -> defer.Deferred
+        estimators = []
+        for account in funding_accounts:
+            utxos = yield self.get_unspent_outputs(account)
+            for utxo in utxos:
+                estimators.append(utxo.get_estimator(self))
+        defer.returnValue(estimators)
+
     @defer.inlineCallbacks
     def get_local_status(self, address):
         address_details = yield self.db.get_address(address)
diff --git a/torba/basetransaction.py b/torba/basetransaction.py
index 8ae403675..8914b9173 100644
--- a/torba/basetransaction.py
+++ b/torba/basetransaction.py
@@ -1,6 +1,6 @@
 import six
 import logging
-from typing import List, Iterable, Generator
+from typing import List, Iterable
 from binascii import hexlify
 
 from twisted.internet import defer
@@ -271,17 +271,6 @@ class BaseTransaction:
             ])
             self.locktime = stream.read_uint32()
 
-    @classmethod
-    @defer.inlineCallbacks
-    def get_effective_amount_estimators(cls, funding_accounts):
-        # type: (Iterable[torba.baseaccount.BaseAccount]) -> Generator[BaseOutputEffectiveAmountEstimator]
-        estimators = []
-        for account in funding_accounts:
-            utxos = yield account.ledger.get_unspent_outputs(account)
-            for utxo in utxos:
-                estimators.append(utxo.get_estimator(account.ledger))
-        defer.returnValue(estimators)
-
     @classmethod
     def ensure_all_have_same_ledger(cls, funding_accounts, change_account=None):
         # type: (Iterable[torba.baseaccount.BaseAccount], torba.baseaccount.BaseAccount) -> torba.baseledger.BaseLedger
@@ -306,7 +295,7 @@ class BaseTransaction:
         tx = cls().add_outputs(outputs)
         ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
         amount = tx.output_sum + ledger.get_transaction_base_fee(tx)
-        txos = yield cls.get_effective_amount_estimators(funding_accounts)
+        txos = yield ledger.get_effective_amount_estimators(funding_accounts)
         selector = CoinSelector(
             txos, amount,
             ledger.get_input_output_fee(
diff --git a/torba/wallet.py b/torba/wallet.py
index a93b77f25..9ac2d9f76 100644
--- a/torba/wallet.py
+++ b/torba/wallet.py
@@ -17,7 +17,7 @@ class Wallet:
     def __init__(self, name='Wallet', accounts=None, storage=None):
         # type: (str, List[torba.baseaccount.BaseAccount], WalletStorage) -> None
         self.name = name
-        self.accounts = accounts or []
+        self.accounts = accounts or []  # type: List[torba.baseaccount.BaseAccount]
         self.storage = storage or WalletStorage()
 
     def generate_account(self, ledger):