diff --git a/.gitignore b/.gitignore
index 558f498..7ebd175 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ gmon.out
 build/
 dist/
 *.sqlite
+old/
diff --git a/chainsyncer/driver/__init__.py b/chainsyncer/driver/__init__.py
new file mode 100644
index 0000000..4e3fffc
--- /dev/null
+++ b/chainsyncer/driver/__init__.py
@@ -0,0 +1 @@
+from .base import SyncDriver
diff --git a/chainsyncer/driver.py b/chainsyncer/driver/base.py
similarity index 91%
rename from chainsyncer/driver.py
rename to chainsyncer/driver/base.py
index f266edb..3bb23c1 100644
--- a/chainsyncer/driver.py
+++ b/chainsyncer/driver/base.py
@@ -94,11 +94,12 @@ class SyncDriver:
 
     def loop(self, conn, item, interval=1):
         logg.debug('started loop')
-        tx_start = item.tx_cursor
         while self.running and SyncDriver.running_global:
             self.last_start = time.clock_gettime_ns(self.clock_id)
+
             if self.pre_callback != None:
                 self.pre_callback()
+
             while True and self.running:
                 try:
                     block = self.get(conn, item)
@@ -111,27 +112,26 @@ class SyncDriver:
                     self.block_callback(block, None)
 
                 try:
-                    self.process(conn, item, block, tx_start)
+                    self.process(conn, item, block)
                 except IndexError:
                     item.next(advance_block=True)
-                tx_start = 0
                 time.sleep(self.yield_delay)
+
+                if self.store.target > -1 and block.number >= self.store.target:
+                    self.running = False
+
             if self.post_callback != None:
                 self.post_callback()
    
-            logg.debug('fooo')
-            if self.store.target > -1 and block.number >= self.store.target:
-                self.running = False
 
             self.idle(interval)
 
 
     def process_single(self, conn, block, tx):
-        logg.debug('single')
         self.session.filter(conn, block, tx)
 
 
-    def process(self, conn, block, tx_start):
+    def process(self, conn, item, block):
         raise NotImplementedError()
 
 
diff --git a/chainsyncer/driver/chain_interface.py b/chainsyncer/driver/chain_interface.py
new file mode 100644
index 0000000..1b53ebd
--- /dev/null
+++ b/chainsyncer/driver/chain_interface.py
@@ -0,0 +1,57 @@
+# external imports
+from chainlib.error import RPCException
+
+# local imports
+from chainsyncer.error import NoBlockForYou
+from chainsyncer.driver import SyncDriver
+
+
+class ChainInterfaceDriver(SyncDriver):
+
+    def __init__(self, store, chain_interface, offset=0, target=-1, pre_callback=None, post_callback=None, block_callback=None, idle_callback=None):
+        super(ChainInterfaceDriver, self).__init__(store, offset=offset, target=target, pre_callback=pre_callback, post_callback=post_callback, block_callback=block_callback, idle_callback=idle_callback)
+        self.chain_interface = chain_interface
+
+
+    def get(self, conn, item):
+        """Retrieve the block currently defined by the syncer cursor from the RPC provider.
+
+        :param conn: RPC connection
+        :type conn: chainlib.connectin.RPCConnection
+        :raises NoBlockForYou: Block at the given height does not exist
+        :rtype: chainlib.block.Block
+        :returns: Block object
+        """
+        o = self.chain_interface.block_by_number(item.cursor)
+        try:
+            r = conn.do(o)
+        except RPCException:
+            r = None
+        if r == None:
+            raise NoBlockForYou()
+        b = self.chain_interface.block_from_src(r)
+        b.txs = b.txs[item.tx_cursor:]
+
+        return b
+
+
+    def process(self, conn, item, block):
+        tx_src = None
+        i = item.tx_cursor
+        while True:
+            # handle block objects regardless of whether the tx data is embedded or not
+            try:
+                tx = block.tx(i)
+            except AttributeError:
+                tx_hash = block.txs[i]
+                o = self.chain_interface.tx_by_hash(tx_hash, block=block)
+                r = conn.do(o)
+                #tx = self.chain_interface.tx_from_src(tx_src, block=block)
+
+            rcpt = conn.do(self.chain_interface.tx_receipt(tx.hash))
+            if rcpt != None:
+                tx.apply_receipt(self.chain_interface.src_normalize(rcpt))
+
+            self.process_single(conn, block, tx)
+                        
+            i += 1
diff --git a/chainsyncer/unittest/base.py b/chainsyncer/unittest/base.py
index 33c9a5c..ea21ad7 100644
--- a/chainsyncer/unittest/base.py
+++ b/chainsyncer/unittest/base.py
@@ -121,7 +121,7 @@ class MockBlock:
         :param i: Transaction index
         :type i: int
         """
-        return MockTx(i, self.txs[i])
+        return MockTx(i, self.txs[i].hash)
 
 
 class MockStore(State):
@@ -170,7 +170,7 @@ class MockFilter:
                 r = True
             self.brk -= 1
         self.contents.append((block.number, tx.index, tx.hash,))
-        logg.debug('filter {} result {} block {}'.format(self.common_name(), r, block.number))
+        logg.debug('filter {} result {} block {} tx {} {}'.format(self.common_name(), r, block.number, tx.index, tx.hash))
         return r
 
 
@@ -202,8 +202,8 @@ class MockDriver(SyncDriver):
             raise NoBlockForYou()
 
 
-    def process(self, conn, item, block, tx_start):
-        i = tx_start
+    def process(self, conn, item, block):
+        i = item.tx_cursor
         while self.running:
             if self.interrupt != None:
                 if self.interrupt[0] == block.number and self.interrupt[1] == i:
@@ -216,3 +216,54 @@ class MockDriver(SyncDriver):
             self.process_single(conn, block, tx)
             item.next()
             i += 1
+
+
+class MockChainInterface:
+
+    def block_by_number(self, number):
+        return ('block_by_number', number,)
+
+
+    def tx_by_hash(self, hsh):
+        return ('tx_by_hash', hsh,)
+
+
+    def block_from_src(self, src):
+        return src
+
+
+    def src_normalize(self, src):
+        return src
+
+
+    def tx_receipt(self, hsh):
+        return ('receipt', hsh,)
+
+
+class MockChainInterfaceConn(MockConn):
+
+    def __init__(self, interface):
+        self.ifc = interface
+        self.blocks = {}
+        self.txs = {}
+   
+
+    def add_block(self, block):
+        logg.debug('add block {} {} with {} txs'.format(block.number, block.hash, len(block.txs)))
+        self.blocks[block.number] = block
+        for tx in block.txs:
+            self.txs[tx.hash] = tx
+           
+
+    def do(self, o):
+        m = getattr(self, 'handle_' + o[0])
+        return m(o[1])
+
+
+    def handle_block_by_number(self, number):
+        return self.blocks[number]
+
+
+
+    def handle_receipt(self, hsh):
+        return {}
diff --git a/setup.cfg b/setup.cfg
index 4cd862d..c5cd2ec 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = chainsyncer
-version = 0.2.0
+version = 0.3.0
 description = Generic blockchain syncer driver
 author = Louis Holbrook
 author_email = dev@holbrook.no
diff --git a/tests/test_driver.py b/tests/test_driver.py
new file mode 100644
index 0000000..80d61a7
--- /dev/null
+++ b/tests/test_driver.py
@@ -0,0 +1,61 @@
+# standard imports
+import unittest
+import tempfile
+import shutil
+import logging
+import stat
+import os
+
+# local imports
+from chainsyncer.store.fs import SyncFsStore
+from chainsyncer.session import SyncSession
+from chainsyncer.error import (
+        LockError,
+        FilterDone,
+        IncompleteFilterError,
+        SyncDone,
+        )
+from chainsyncer.unittest import (
+        MockBlockGenerator,
+        MockFilter,
+        MockChainInterfaceConn,
+        MockTx,
+        MockBlock,
+        MockChainInterface,
+        MockFilterError,
+        )
+from chainsyncer.driver.chain_interface import ChainInterfaceDriver
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+
+class TestFilter(unittest.TestCase):
+
+    def setUp(self):
+        self.path = tempfile.mkdtemp()
+        self.store = SyncFsStore(self.path)
+        self.ifc = MockChainInterface()
+        self.conn = MockChainInterfaceConn(self.ifc)
+
+
+    def tearDown(self):
+        shutil.rmtree(self.path)
+
+
+    def test_driver(self):
+        generator = MockBlockGenerator()
+        generator.generate([1, 2], driver=self.conn)
+
+        drv = ChainInterfaceDriver(self.store, self.ifc, target=1)
+
+        fltr_one = MockFilter('foo')
+        self.store.register(fltr_one)
+        with self.assertRaises(SyncDone):
+            drv.run(self.conn)
+
+        self.assertEqual(len(fltr_one.contents), 3)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_session.py b/tests/test_session.py
index 3ceeed9..b02e956 100644
--- a/tests/test_session.py
+++ b/tests/test_session.py
@@ -117,7 +117,6 @@ class TestFilter(unittest.TestCase):
         fltr_three = MockFilter('baz')
         self.store.register(fltr_three)
 
-
         store = SyncFsStore(self.path, state_event_callback=state_event_handler, filter_state_event_callback=filter_state_event_handler)
 
         with self.assertRaises(SyncDone):