diff --git a/tinman/constants.py b/tinman/constants.py
new file mode 100644
index 0000000..b5ce547
--- /dev/null
+++ b/tinman/constants.py
@@ -0,0 +1,37 @@
+# This Python file uses the following encoding: utf-8
+
+
+MAINNET_PREFIX = "STM"
+TESTNET_PREFIX = "TST"
+PUB_KEY_LEN = 53
+MAINNET_DISABLED_WITNESS_KEY = "STM1111111111111111111111111111111114T1Anm"
+TESTNET_DISABLED_WITNESS_KEY = "TST1111111111111111111111111111111114T1Anm"
+
+
+"""
+Whitelist of exceptions from transaction source (Mainnet)."
+"""
+
+TRANSACTION_SOURCE_RETRYABLE_ERRORS = [
+  "Unable to acquire database lock",
+  "Internal Error",
+  "Server error",
+  "Upstream response error"
+]
+
+MAX_RETRY = 30
+
+DATABASE_API_SINGLE_QUERY_LIMIT = 1000
+
+ACTIONS_MAJOR_VERSION_SUPPORTED = 0
+ACTIONS_MINOR_VERSION_SUPPORTED = 2
+
+
+SNAPSHOT_MAJOR_VERSION_SUPPORTED = 0
+SNAPSHOT_MINOR_VERSION_SUPPORTED = 2
+STEEM_GENESIS_TIMESTAMP = 1451606400
+STEEM_BLOCK_INTERVAL = 3
+NUM_BLOCKS_TO_CLEAR_WITNESS_ROUND = 21
+TRANSACTION_WITNESS_SETUP_PAD = 100
+STEEM_MAX_AUTHORITY_MEMBERSHIP = 10
+DENOM = 10**12        # we need stupidly high precision because VESTS
\ No newline at end of file
diff --git a/tinman/gatling.py b/tinman/gatling.py
index d36e7be..db9b908 100755
--- a/tinman/gatling.py
+++ b/tinman/gatling.py
@@ -9,15 +9,8 @@
 from . import prockey
 from . import util
 
-# Whitelist of exceptions from transaction source (Mainnet).
-TRANSACTION_SOURCE_RETRYABLE_ERRORS = [
-  "Unable to acquire database lock",
-  "Internal Error",
-  "Server error",
-  "Upstream response error"
-]
+from tinman.constants import MAX_RETRY, TRANSACTION_SOURCE_RETRYABLE_ERRORS
 
-MAX_RETRY = 30
 
 def str2bool(str_arg):
     """
diff --git a/tinman/prefixsub.py b/tinman/prefixsub.py
index 37e8c29..93255a4 100644
--- a/tinman/prefixsub.py
+++ b/tinman/prefixsub.py
@@ -7,11 +7,9 @@
 import sys
 import math
 
-MAINNET_PREFIX = "STM"
-TESTNET_PREFIX = "TST"
-PUB_KEY_LEN = 53
-MAINNET_DISABLED_WITNESS_KEY = "STM1111111111111111111111111111111114T1Anm"
-TESTNET_DISABLED_WITNESS_KEY = "TST1111111111111111111111111111111114T1Anm"
+from tinman.constants import  MAINNET_PREFIX, TESTNET_PREFIX, PUB_KEY_LEN, MAINNET_DISABLED_WITNESS_KEY,\
+    TESTNET_DISABLED_WITNESS_KEY
+
 
 def transform_prefix(object):
     if isinstance(object, list):
@@ -37,6 +35,7 @@ def transform_prefix(object):
         else:
             return object
 
+
 def main(argv):
     parser = argparse.ArgumentParser(prog=argv[0], description="Substitute prefix")
     parser.add_argument("-i", "--input-file", default="-", dest="input_file", metavar="FILE", help="File to read actions from")
@@ -75,5 +74,6 @@ def main(argv):
     if args.output_file != "-":
         output_file.close()
 
+
 if __name__ == "__main__":
     main(sys.argv)
diff --git a/tinman/simple_steem_client b/tinman/simple_steem_client
new file mode 160000
index 0000000..1fb4ef5
--- /dev/null
+++ b/tinman/simple_steem_client
@@ -0,0 +1 @@
+Subproject commit 1fb4ef5a53cff992a2f3de2b88d2129678194971
diff --git a/tinman/snapshot.py b/tinman/snapshot.py
index f630fb2..b039fad 100755
--- a/tinman/snapshot.py
+++ b/tinman/snapshot.py
@@ -11,17 +11,8 @@
 from simple_steem_client.client import SteemRemoteBackend, SteemInterface, SteemRPCException
 
 from . import __version__
+from tinman.constants import DATABASE_API_SINGLE_QUERY_LIMIT, MAX_RETRY, TRANSACTION_SOURCE_RETRYABLE_ERRORS
 
-DATABASE_API_SINGLE_QUERY_LIMIT = 1000
-MAX_RETRY = 30
-
-# Whitelist of exceptions from transaction source (Mainnet).
-TRANSACTION_SOURCE_RETRYABLE_ERRORS = [
-  "Unable to acquire database lock",
-  "Internal Error",
-  "Server error",
-  "Upstream response error"
-]
 
 def list_all_accounts(steemd):
     """ Generator function providing set of accounts existing in the Main Steem net """
diff --git a/tinman/submit.py b/tinman/submit.py
index 3db4eea..255a444 100755
--- a/tinman/submit.py
+++ b/tinman/submit.py
@@ -14,11 +14,9 @@
 import sys
 import time
 import traceback
-
 from . import util
+from tinman.constants import ACTIONS_MAJOR_VERSION_SUPPORTED, ACTIONS_MINOR_VERSION_SUPPORTED
 
-ACTIONS_MAJOR_VERSION_SUPPORTED = 0
-ACTIONS_MINOR_VERSION_SUPPORTED = 2
 
 class TransactionSigner(object):
     def __init__(self, sign_transaction_exe=None, chain_id=None):
@@ -37,6 +35,7 @@ def sign_transaction(self, tx, wif):
         line = self.proc.stdout.readline().decode("utf-8")
         return json.loads(line)
 
+
 class CachedDgpo(object):
     def __init__(self, timefunc=time.time, refresh_interval=1.0, steemd=None):
         self.timefunc = timefunc
@@ -111,6 +110,7 @@ def generate_blocks(steemd, args, cached_dgpo=None, now=None, produce_realtime=F
                )
     return
 
+
 def main(argv):
 
     parser = argparse.ArgumentParser(prog=argv[0], description="Submit transactions to Steem")
diff --git a/tinman/txgen.py b/tinman/txgen.py
index 860c96d..73f58db 100755
--- a/tinman/txgen.py
+++ b/tinman/txgen.py
@@ -21,15 +21,10 @@
 from . import __version__
 from . import prockey
 from . import util
+from tinman.constants import SNAPSHOT_MAJOR_VERSION_SUPPORTED, SNAPSHOT_MINOR_VERSION_SUPPORTED, STEEM_GENESIS_TIMESTAMP, \
+    STEEM_BLOCK_INTERVAL, NUM_BLOCKS_TO_CLEAR_WITNESS_ROUND, TRANSACTION_WITNESS_SETUP_PAD, \
+    STEEM_MAX_AUTHORITY_MEMBERSHIP, DENOM
 
-SNAPSHOT_MAJOR_VERSION_SUPPORTED = 0
-SNAPSHOT_MINOR_VERSION_SUPPORTED = 2
-STEEM_GENESIS_TIMESTAMP = 1451606400
-STEEM_BLOCK_INTERVAL = 3
-NUM_BLOCKS_TO_CLEAR_WITNESS_ROUND = 21
-TRANSACTION_WITNESS_SETUP_PAD = 100
-STEEM_MAX_AUTHORITY_MEMBERSHIP = 10
-DENOM = 10**12        # we need stupidly high precision because VESTS
 
 def create_system_accounts(conf, keydb, name):
     desc = conf["accounts"][name]
@@ -53,6 +48,7 @@ def create_system_accounts(conf, keydb, name):
 
     return
 
+
 def vote_accounts(conf, keydb, elector, elected):
     er_desc = conf["accounts"][elector]
     ed_desc = conf["accounts"][elected]