diff --git a/python/eth_address_declarator/declarator.py b/python/eth_address_declarator/declarator.py
index e1282dd..ef0ae31 100644
--- a/python/eth_address_declarator/declarator.py
+++ b/python/eth_address_declarator/declarator.py
@@ -38,8 +38,8 @@ class AddressDeclarator:
     @staticmethod
     def abi():
         if AddressDeclarator.__abi == None:
-            f = open(os.path.join(datadir, 'AccountDeclarator.json'), 'r')
-            AccountDeclarator.__abi = json.load(f)
+            f = open(os.path.join(datadir, 'AddressDeclarator.json'), 'r')
+            AddressDeclarator.__abi = json.load(f)
             f.close()
         return AddressDeclarator.__abi
 
@@ -47,8 +47,8 @@ class AddressDeclarator:
     @staticmethod
     def bytecode():
         if AddressDeclarator.__bytecode == None:
-            f = open(os.path.join(datadir, 'AccountDeclarator.bin'))
-            AccountDeclarator.__bytecode = f.read()
+            f = open(os.path.join(datadir, 'AddressDeclarator.bin'))
+            AddressDeclarator.__bytecode = f.read()
             f.close()
         return AddressDeclarator.__bytecode
 
diff --git a/python/eth_address_declarator/runnable/add.py b/python/eth_address_declarator/runnable/add.py
index 2978f2f..b782631 100644
--- a/python/eth_address_declarator/runnable/add.py
+++ b/python/eth_address_declarator/runnable/add.py
@@ -16,6 +16,7 @@ import web3
 from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
 from crypto_dev_signer.keystore import DictKeystore
 from crypto_dev_signer.eth.helper import EthTxExecutor
+from chainlib.chain import ChainSpec
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -60,8 +61,8 @@ if args.y != None:
     logg.debug('now have key for signer address {}'.format(signer_address))
 signer = EIP155Signer(keystore)
 
-chain_pair = args.i.split(':')
-chain_id = int(chain_pair[1])
+chain_spec = ChainSpec.from_chain_str(args.i)
+chain_id = chain_spec.network_id()
 
 helper = EthTxExecutor(
         w3,
diff --git a/python/eth_address_declarator/runnable/deploy.py b/python/eth_address_declarator/runnable/deploy.py
index 6da9b79..f24767d 100644
--- a/python/eth_address_declarator/runnable/deploy.py
+++ b/python/eth_address_declarator/runnable/deploy.py
@@ -16,6 +16,7 @@ import web3
 from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
 from crypto_dev_signer.keystore import DictKeystore
 from crypto_dev_signer.eth.helper import EthTxExecutor
+from chainlib.chain import ChainSpec
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -57,8 +58,8 @@ if args.y != None:
     logg.debug('now have key for signer address {}'.format(signer_address))
 signer = EIP155Signer(keystore)
 
-chain_pair = args.i.split(':')
-chain_id = int(chain_pair[1])
+chain_spec = ChainSpec.from_chain_str(args.i)
+chain_id = chain_spec.network_id()
 
 helper = EthTxExecutor(
         w3,
diff --git a/python/eth_token_index/runnable/add.py b/python/eth_token_index/runnable/add.py
index 888051b..825501a 100644
--- a/python/eth_token_index/runnable/add.py
+++ b/python/eth_token_index/runnable/add.py
@@ -17,6 +17,7 @@ import web3
 from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
 from crypto_dev_signer.keystore import DictKeystore
 from crypto_dev_signer.eth.helper import EthTxExecutor
+from chainlib.chain import ChainSpec
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -59,8 +60,8 @@ if args.y != None:
     logg.debug('now have key for signer address {}'.format(signer_address))
 signer = EIP155Signer(keystore)
 
-chain_pair = args.i.split(':')
-chain_id = int(chain_pair[1])
+chain_spec = ChainSpec.from_chain_str(args.i)
+chain_id = chain_spec.network_id()
 
 helper = EthTxExecutor(
         w3,
diff --git a/python/eth_token_index/runnable/deploy.py b/python/eth_token_index/runnable/deploy.py
index 4d2b0b1..26d87fe 100644
--- a/python/eth_token_index/runnable/deploy.py
+++ b/python/eth_token_index/runnable/deploy.py
@@ -16,6 +16,7 @@ import web3
 from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
 from crypto_dev_signer.keystore import DictKeystore
 from crypto_dev_signer.eth.helper import EthTxExecutor
+from chainspec.chain import ChainSpec
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -56,8 +57,8 @@ if args.y != None:
     logg.debug('now have key for signer address {}'.format(signer_address))
 signer = EIP155Signer(keystore)
 
-chain_pair = args.i.split(':')
-chain_id = int(chain_pair[1])
+chain_spec = ChainSpec.from_chain_str(args.i)
+chain_id = chain_spec.network_id()
 
 helper = EthTxExecutor(
         w3,
diff --git a/python/setup.cfg b/python/setup.cfg
index e4e1d67..1c89ec9 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = eth-address-index
-version = 0.1.0a8
+version = 0.1.0a9
 description = Signed metadata declarations for ethereum addresses
 author = Louis Holbrook
 author_email = dev@holbrook.no
@@ -31,6 +31,7 @@ packages =
 install_requires =
 	web3==5.12.2
 	crypto-dev-signer~=0.4.13rc2
+	chainlib~=0.0.1a15
 tests_require =
 	eth-tester==0.5.0b2
 	py-evm==0.3.0a20