diff --git a/crypto/configuration/network.py b/crypto/configuration/network.py
index 8aec94a..285fd5d 100644
--- a/crypto/configuration/network.py
+++ b/crypto/configuration/network.py
@@ -5,13 +5,13 @@
 
 class NetworkType(TypedDict):
     epoch: datetime
-    version: int
     wif: int
+    chain_id: int
 
 network: NetworkType = {
     'epoch': Testnet.epoch,
-    'version': Testnet.version,
     'wif': Testnet.wif,
+    'chain_id': Testnet.chain_id,
 }
 
 def set_network(network_object: Union[Type[Mainnet], Type[Testnet]]) -> None:
@@ -24,8 +24,8 @@ def set_network(network_object: Union[Type[Mainnet], Type[Testnet]]) -> None:
 
     network = {
         'epoch': network_object.epoch,
-        'version': network_object.version,
         'wif': network_object.wif,
+        'chain_id': network_object.chain_id,
     }
 
 def get_network() -> NetworkType:
@@ -36,18 +36,18 @@ def get_network() -> NetworkType:
     """
     return network
 
-def set_custom_network(epoch: datetime, version: int, wif: int) -> None:
+def set_custom_network(epoch: datetime, wif: int, chain_id: int) -> None:
     """Set custom network
 
     Args:
         epoch (datetime): chains epoch time
-        version (int): chains version
         wif (int): chains wif
+        chain_id (int): chain id
     """
     global network
 
     network = {
         'epoch': epoch,
-        'version': version,
         'wif': wif,
+        'chain_id': chain_id
     }
diff --git a/crypto/networks/mainnet.py b/crypto/networks/mainnet.py
index d352edc..d9a2297 100644
--- a/crypto/networks/mainnet.py
+++ b/crypto/networks/mainnet.py
@@ -2,5 +2,5 @@
 
 class Mainnet(object):
     epoch = datetime(2017, 3, 21, 13, 00, 00)
-    version = 30
     wif = 186
+    chain_id = 10000
diff --git a/crypto/networks/testnet.py b/crypto/networks/testnet.py
index a279eac..d879ab8 100644
--- a/crypto/networks/testnet.py
+++ b/crypto/networks/testnet.py
@@ -2,5 +2,5 @@
 
 class Testnet(object):
     epoch = datetime(2017, 3, 21, 13, 00, 00)
-    version = 30
     wif = 186
+    chain_id = 10000
diff --git a/crypto/transactions/builder/base.py b/crypto/transactions/builder/base.py
index c9f12ee..133dc58 100644
--- a/crypto/transactions/builder/base.py
+++ b/crypto/transactions/builder/base.py
@@ -11,7 +11,7 @@ def __init__(self, data: dict):
             'senderPublicKey': '',
             'gasPrice': '5',
             'nonce': '1',
-            'network': get_network()['version'],
+            'network': get_network()['chain_id'],
             'gasLimit': 1_000_000,
             'data': '',
 
diff --git a/tests/configuration/test_network.py b/tests/configuration/test_network.py
index d0a963d..260b1be 100644
--- a/tests/configuration/test_network.py
+++ b/tests/configuration/test_network.py
@@ -8,31 +8,29 @@
 
 def test_get_network():
     result = get_network()
-    assert result['version'] == 30
-
+    assert result['chain_id'] == 10000
 
 def test_set_network():
     # mainnet
     set_network(Mainnet)
     result = get_network()
-    assert result['version'] == 30
     assert result['wif'] == 186
+    assert result['chain_id'] == 10000
 
     # testnet
     set_network(Testnet)
     result = get_network()
-    assert result['version'] == 30
     assert result['wif'] == 186
+    assert result['chain_id'] == 10000
 
     set_network(Testnet)  # set back to Testnet so other tests don't fail
 
-
 def test_set_custom_network():
     epoch_time = datetime(2017, 1, 1, 13, 00, 00)
-    set_custom_network(epoch_time, 11, 130)
+    set_custom_network(epoch_time, 130, 10000)
     result = get_network()
-    assert result['version'] == 11
     assert result['wif'] == 130
     assert result['epoch'] == epoch_time
+    assert result['chain_id'] == 10000
 
     set_network(Testnet)  # set back to Testnet so other tests don't fail