diff --git a/src/dexorder/blocks.py b/src/dexorder/blocks.py
index 0deb470..aceb79c 100644
--- a/src/dexorder/blocks.py
+++ b/src/dexorder/blocks.py
@@ -31,7 +31,7 @@ async def get_block_timestamp(block_id: Union[bytes,int]) -> int:
 
 class FetchLock:
     def __init__(self):
-        self.lock = Event()
+        self.ready = Event()
         self.result = None
         self.exception = None
 
@@ -64,8 +64,10 @@ async def _fetch(fetch: FetchLock, chain_id: int, block_id: Union[int,bytes]) ->
         return fetch.result
     except Exception as e:
         fetch.exception = e
+        fetch.result = None
+        raise
     finally:
-        fetch.lock.set()
+        fetch.ready.set()
 
 
 _lru = LRUCache[tuple[int, Union[int,bytes]], Block](maxsize=256)
@@ -82,12 +84,14 @@ def cache_block(block: Block, confirmed=False):
 
 
 async def get_block(block_id: Union[bytes,int], *, chain_id=None) -> Block:
+    # log.debug(f'get_block {block_id}')
     if chain_id is None:
         chain_id = current_chain.get().id
 
     key = chain_id, block_id
     # try LRU cache synchronously first
     try:
+        # log.debug(f'\thit LRU')
         return _lru[key]
     except KeyError:
         pass
@@ -95,29 +99,39 @@ async def get_block(block_id: Union[bytes,int], *, chain_id=None) -> Block:
     # check if another thread is already fetching
     fetch = _fetch_locks.get(key)
     if fetch is not None:
-        await fetch.lock.wait()
+        # log.debug(f'\tfound existing fetch')
+        await fetch.ready.wait()
         if fetch.exception is not None:
             raise fetch.exception
         return fetch.result
 
+    # log.debug(f'\tfetching')
     # otherwise initiate our own fetch
     fetch = _fetch_locks[key] = FetchLock()
     try:
-        return await _fetch(fetch, chain_id, block_id)
+        fetch.result = await _fetch(fetch, chain_id, block_id)
+        # log.debug(f'got fetch result {fetch.result}')
+    except Exception as e:
+        # log.exception('get_block exception')
+        fetch.exception = e
+        raise
     finally:
+        # log.debug(f'fetch.result {fetch.result}')
         del _fetch_locks[key]
+    # log.debug(f'\t{fetch.result}')
+    return fetch.result
 
 
 async def fetch_block_by_number(height: int, *, chain_id=None) -> Block:
     # todo roll into get_block()
-    # log.debug(f'fetch_block_by_number {height} {chain_id}')
+    # log.debug(f'fetch_block_by_number {chain_id} {height}')
     if chain_id is None:
         chain = current_chain.get()
         chain_id = chain.id
     else:
         chain = Blockchain.get(chain_id)
     response = await current_w3.get().provider.make_request('eth_getBlockByNumber', [hex(height), False])
-    # log.debug(f'fetch_block_by_number response {height} {chain_id} {response}')
+    # log.debug(f'fetch_block_by_number response {chain_id} {height} {response}')
     block = Block(chain_id, response['result'])
     confirmed = height <= promotion_height(chain)
     cache_block(block, confirmed)
@@ -143,7 +157,7 @@ def promotion_height(chain: Blockchain=None, latest_height: int=None):
     if chain is None:
         chain = current_chain.get()
     if latest_height is None:
-        latest_height = latest_block.get(chain.id)
+        latest_height = latest_block.get(chain.id).height
         if latest_height is None:
             return 0
     confirm_offset = config.confirms if config.confirms is not None else chain.confirms
diff --git a/src/dexorder/database/__init__.py b/src/dexorder/database/__init__.py
index a15215a..8462c23 100644
--- a/src/dexorder/database/__init__.py
+++ b/src/dexorder/database/__init__.py
@@ -116,10 +116,10 @@ class Db:
             connection.execute(sqlalchemy.text("SET TIME ZONE 'UTC'"))
             result = connection.execute(sqlalchemy.text("select version_num from alembic_version"))
         for row in result:
-            log.info(f'{url} database revision {row[0]}')
+            log.info(f'database revision {row[0]}')
             _engine.set(engine)
             self.connected = True
             return self
-        raise Exception(f'{url} database version not found')
+        raise Exception(f'database version not found')
 
 db = Db()
diff --git a/src/dexorder/walker.py b/src/dexorder/walker.py
index 03577e0..967d0f0 100644
--- a/src/dexorder/walker.py
+++ b/src/dexorder/walker.py
@@ -5,13 +5,11 @@ from datetime import timedelta
 from typing import Union, Callable
 
 from dexorder import config, db, now, current_w3
+from dexorder.base.block import Block, BlockInfo, latest_block
 from dexorder.base.chain import current_chain
 from dexorder.blocks import promotion_height
-from dexorder.blockstate import current_blockstate
 from dexorder.blockstate.branch import Branch
 from dexorder.blockstate.fork import Fork, current_fork
-from dexorder.blockstate.state import FinalizedBlockState
-from dexorder.base.block import Block, BlockInfo, latest_block
 from dexorder.progressor import BlockProgressor
 from dexorder.util.async_util import Maywaitable, maywait
 
@@ -47,8 +45,6 @@ class BlockWalker (BlockProgressor):
         chain = current_chain.get()
         chain_id = chain.id
         batch_size = config.batch_size if config.batch_size is not None else chain.batch_size
-        state = FinalizedBlockState()
-        current_blockstate.set(state)
 
         kv_key = f'walker_height|{chain_id}|{self.name}'
         with db.session: