diff --git a/python/CHANGELOG b/python/CHANGELOG
index e3a698d..cd447ad 100644
--- a/python/CHANGELOG
+++ b/python/CHANGELOG
@@ -1,3 +1,8 @@
+- 0.0.10-unreleased
+	- Implement external signer
+	- Standardize cli arg flags
+- 0.0.9
+	- Fix wrong abi path in registry.py
 - 0.0.8
 	- Add executable to add writers and addresses after deploy
 - 0.0.7
diff --git a/python/eth_accounts_index/data/AccountsIndex.bin b/python/eth_accounts_index/data/AccountsIndex.bin
index a7baa0c..5266722 100644
--- a/python/eth_accounts_index/data/AccountsIndex.bin
+++ b/python/eth_accounts_index/data/AccountsIndex.bin
@@ -1 +1 @@
-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
\ No newline at end of file
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
\ No newline at end of file
diff --git a/python/eth_accounts_index/runnable/add.py b/python/eth_accounts_index/runnable/add.py
index 07ffce0..d1fbfde 100644
--- a/python/eth_accounts_index/runnable/add.py
+++ b/python/eth_accounts_index/runnable/add.py
@@ -13,7 +13,9 @@ import logging
 
 # third-party imports
 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
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -26,40 +28,76 @@ data_dir = os.path.join(script_dir, '..', 'data')
 
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
-argparser.add_argument('-w', '--writer', dest='w', action='append', type=str, help='Writer to add')
-argparser.add_argument('-o', '--owner', dest='o', type=str, help='Accounts index owner')
-argparser.add_argument('-a', '--account', dest='a', action='append', type=str, help='Account to add')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
+argparser.add_argument('--writer', dest='writer', action='append', type=str, help='Writer to add')
+argparser.add_argument('-a', '--signer-address', dest='o', type=str, help='Accounts index owner')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
+argparser.add_argument('--account', dest='account', action='append', type=str, help='Account to add')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
 argparser.add_argument('-r', '--accounts-index-address', dest='r', required=True, type=str, help='Contract address to account index to edit')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
+
+block_last = args.w
+block_all = args.ww
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    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])
+
+helper = EthTxExecutor(
+        w3,
+        signer_address,
+        signer,
+        chain_id,
+        block=args.ww,
+    )
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
-
     f = open(os.path.join(args.abi_dir, 'AccountsIndex.json'), 'r')
     abi = json.load(f)
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
-    if args.o != None:
-        w3.eth.defaultAccount = args.o
-    logg.debug('owner address {}'.format(w3.eth.defaultAccount))
-
     c = w3.eth.contract(abi=abi, address=args.r)
 
-    if args.w != None:
-        for w in args.w:
+    if args.writer != None:
+        for w in args.writer:
             logg.info('adding {} to write list'.format(w))
-            print(c.functions.addWriter(w).transact().hex())
+            (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.functions.addWriter(w).buildTransaction,
+                ],
+            )
+            print(tx_hash)
 
-    if args.a != None:
-        for a in args.a:
+
+    if args.account != None:
+        for a in args.account:
             logg.info('adding {} to accounts index'.format(a))
-            print(c.functions.add(a).transact().hex())
+            (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.functions.add(a).buildTransaction,
+                ],
+            )
+            print(tx_hash)
 
 
 if __name__ == '__main__':
diff --git a/python/eth_accounts_index/runnable/deploy.py b/python/eth_accounts_index/runnable/deploy.py
index aa24dd6..d440916 100644
--- a/python/eth_accounts_index/runnable/deploy.py
+++ b/python/eth_accounts_index/runnable/deploy.py
@@ -13,7 +13,9 @@ import logging
 
 # third-party imports
 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
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -26,20 +28,50 @@ data_dir = os.path.join(script_dir, '..', 'data')
 
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
-argparser.add_argument('-w', '--writer', dest='w', action='append', type=str, help='Writer to add')
-argparser.add_argument('-o', '--owner', dest='o', type=str, help='Accounts index owner')
-argparser.add_argument('-a', '--account', dest='a', action='append', type=str, help='Account to add')
-argparser.add_argument('-k', '--keep-sender', dest='k', action='store_true', help='If set, sender will be kept as writer')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
+argparser.add_argument('--writer', dest='writer', action='append', type=str, help='Writer to add')
+argparser.add_argument('-a', '--signer-address', dest='a', type=str, help='Signing address')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
+argparser.add_argument('--account', action='append', type=str, help='Account to add')
+argparser.add_argument('--keep-sender', dest='keep_sender', action='store_true', help='If set, sender will be kept as writer')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
+
+block_last = args.w
+block_all = args.ww
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    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])
+
+helper = EthTxExecutor(
+        w3,
+        signer_address,
+        signer,
+        chain_id,
+        block=args.ww,
+    )
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
-
     f = open(os.path.join(args.abi_dir, 'AccountsIndex.json'), 'r')
     abi = json.load(f)
     f.close()
@@ -48,60 +80,53 @@ def main():
     bytecode = f.read()
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
-    if args.o != None:
-        w3.eth.defaultAccount = args.o
-    logg.debug('owner address {}'.format(w3.eth.defaultAccount))
-
     c = w3.eth.contract(abi=abi, bytecode=bytecode)
-    tx_hash = c.constructor().transact()
-
-    rcpt = w3.eth.getTransactionReceipt(tx_hash)
-
+    (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.constructor().buildTransaction
+                ],
+            force_wait=True,
+            )
     address = rcpt.contractAddress
+
     c = w3.eth.contract(abi=abi, address=address)
 
     logg.debug('adding sender to write list')
-    c.functions.addWriter(w3.eth.accounts[0]).transact()
+    (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.functions.addWriter(signer_address).buildTransaction
+                ],
+            force_wait=True,
+            )
     
-    if args.w != None:
-        for w in args.w:
+    if args.writer != None:
+        for w in args.writer:
             logg.info('adding {} to write list'.format(w))
-            c.functions.addWriter(w).transact()
+            (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.functions.addWriter(w).buildTransaction
+                ],
+            )
 
-    if args.a != None:
-        for a in args.a:
+    if args.account != None:
+        for a in args.account:
             logg.info('adding {} to accounts index'.format(a))
-            c.functions.add(a).transact()
+            (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.functions.add(a).buildTransaction
+                ],
+            )
 
-    if not args.k:
+    if not args.keep_sender:
         logg.debug('deleting sender for write list')
-        c.functions.deleteWriter(w3.eth.defaultAccount).transact()
+        (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.functions.deleteWriter(signer_address).buildTransaction
+                ],
+            )
 
     print(address)
 
-#    fail = False
-#    try:
-#        c.functions.add(w3.eth.accounts[2]).transact({'from': w3.eth.accounts[1]})
-#    except:
-#        fail = True
-#    assert fail
-#
-#    c.functions.addWriter(w3.eth.accounts[1]).transact({'from': w3.eth.accounts[0]})
-#    c.functions.add(w3.eth.accounts[2]).transact({'from': w3.eth.accounts[1]})
-#    c.functions.add(w3.eth.accounts[3]).transact({'from': w3.eth.accounts[1]})
-#
-#    assert c.functions.count().call() == 3
-#    assert c.functions.accountsIndex(w3.eth.accounts[3]).call() == 2
-#    assert c.functions.accounts(2).call() == w3.eth.accounts[3]
-#
-#    fail = False
-#    try:
-#        c.functions.add(w3.eth.accounts[3]).transact({'from': w3.eth.accounts[1]})
-#    except:
-#        fail = True
-#    assert fail
-
 
 if __name__ == '__main__':
     main()
diff --git a/python/setup.cfg b/python/setup.cfg
index 94a640c..900c87c 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = eth-accounts-index
-version = 0.0.8
+version = 0.0.10a1
 description = Accounts index evm contract tooling with permissioned writes
 author = Louis Holbrook
 author_email = dev@holbrook.no
@@ -29,6 +29,7 @@ packages =
 install_requires =
 	confini==0.3.5
 	web3==5.12.2
+	crypto-dev-signer~=0.4.13b1
 tests_require = 
 	pytest==6.0.1
 	eth-tester==0.5.0b2
diff --git a/solidity/AccountsIndex.bin b/solidity/AccountsIndex.bin
index a7baa0c..5266722 100644
--- a/solidity/AccountsIndex.bin
+++ b/solidity/AccountsIndex.bin
@@ -1 +1 @@
-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
\ No newline at end of file
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
\ No newline at end of file
diff --git a/solidity/AccountsIndex.abi.json b/solidity/AccountsIndex.json
similarity index 100%
rename from solidity/AccountsIndex.abi.json
rename to solidity/AccountsIndex.json
diff --git a/solidity/AccountsIndex.sol b/solidity/AccountsIndex.sol
index 12229d6..bae6b08 100644
--- a/solidity/AccountsIndex.sol
+++ b/solidity/AccountsIndex.sol
@@ -1,4 +1,4 @@
-pragma solidity >=0.6.12;
+pragma solidity >0.6.11;
 
 // SPDX-License-Identifier: GPL-3.0-or-later
 
diff --git a/solidity/Makefile b/solidity/Makefile
index 6aeea31..dc0dc31 100644
--- a/solidity/Makefile
+++ b/solidity/Makefile
@@ -1,7 +1,9 @@
+SOLC = /usr/bin/solc
+
 all:
-	solc --bin AccountsIndex.sol | awk 'NR>3' > AccountsIndex.bin
+	$(SOLC) --bin AccountsIndex.sol --evm-version byzantium | awk 'NR>3' > AccountsIndex.bin
 	truncate -s -1 AccountsIndex.bin
-	solc --abi AccountsIndex.sol | awk 'NR>3' > AccountsIndex.abi.json
+	$(SOLC) --abi AccountsIndex.sol --evm-version byzantium | awk 'NR>3' > AccountsIndex.json
 
 install: all
 	cp -v *{json,bin} ../python/eth_accounts_index/data/