Use external keystore file for signing.

python/CHANGELOG

@@ -1,3 +1,6 @@
+* 0.0.7-unreleased
+	- Implement keystore signing.
+	- Change makefile to compile contract for Byzantium.
 * 0.0.6
 	- Rename contracts-dir flag to abi-dir
 	- Use package data dir as default abi dir

python/giftable_erc20_token/data/GiftableToken.json

@@ -1 +1 @@
-[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint8","name":"_decimals","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"TransferFrom","type":"event"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"addMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"removeMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
+[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint8","name":"_decimals","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"TransferFrom","type":"event"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"addMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"removeMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

python/giftable_erc20_token/runnable/deploy.py

@@ -8,13 +8,16 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # standard imports
+import sys
 import os
 import json
 import argparse
 import logging
+import time
 
 # third-party imports
 import web3
+from eth_keys import keys
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -25,14 +28,19 @@ logging.getLogger('urllib3').setLevel(logging.WARNING)
 script_dir = os.path.dirname(__file__)
 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('-n', '--name', dest='n', default='Giftable Token', type=str, help='Token name')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
-argparser.add_argument('-s', '--symbol', dest='s', default='GFT', type=str, help='Token symbol')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
-argparser.add_argument('-d', '--decimals', dest='d', default=18, type=int, help='Token decimals')
+argparser.add_argument('-e', action='store_true', help='Treat all transactions as essential')
-argparser.add_argument('-o', '--owner', dest='o', type=str, help='Reserve owner account')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
-argparser.add_argument('-a', '--account', dest='a', action='append', type=str, help='Account to fund')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
-argparser.add_argument('-m', '--minter', dest='m', action='append', type=str, help='Minter to add')
+argparser.add_argument('--name', dest='n', default='Giftable Token', type=str, help='Token name')
+argparser.add_argument('--symbol', dest='s', default='GFT', type=str, help='Token symbol')
+argparser.add_argument('--decimals', dest='d', default=18, type=int, help='Token decimals')
+argparser.add_argument('--account', action='append', type=str, help='Account to fund')
+argparser.add_argument('--minter', action='append', type=str, help='Minter to add')
 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('amount', type=int, help='Initial token supply (will be owned by contract creator)')
@@ -41,8 +49,44 @@ args = argparser.parse_args()
 if args.v:
     logg.setLevel(logging.DEBUG)
 
+block_mode = 0
+if args.ww:
+    logg.debug('set block after each tx')
+    block_mode = 2
+elif args.w:
+    logg.debug('set block until last tx')
+    block_mode = 1
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+private_key = None
+signer_address = None
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    f = open(args.y, 'r')
+    encrypted_key = f.read()
+    f.close()
+    private_key = w3.eth.account.decrypt(encrypted_key, '')
+    private_key_object = keys.PrivateKey(private_key)
+    signer_address = private_key_object.public_key.to_checksum_address()
+    logg.debug('now have key for signer address {}'.format(signer_address))
+
+network_pair = args.i.split(':')
+network_id = int(network_pair[1])
+
+
+def waitFor(tx_hash):
+    i = 1
+    while True:
+        try:
+            return w3.eth.getTransactionReceipt(tx_hash)
+        except web3.exceptions.TransactionNotFound:
+            logg.debug('poll #{} for {}'.format(i, tx_hash.hex()))   
+            i += 1
+            time.sleep(1)
+
+
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
 
     f = open(os.path.join(args.abi_dir, 'GiftableToken.json'), 'r')
     abi = json.load(f)
@@ -52,40 +96,120 @@ def main():
     bytecode = f.read()
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
+    gas_price = w3.eth.gasPrice
-    if args.o != None:
+
-        w3.eth.defaultAccount = args.o
+    last_tx = None
+
+    nonce = w3.eth.getTransactionCount(signer_address, 'pending')
 
     c = w3.eth.contract(abi=abi, bytecode=bytecode)
-    tx_hash = c.constructor(args.n, args.s, args.d).transact()
+    tx = c.constructor(args.n, args.s, args.d).buildTransaction({
-    rcpt = w3.eth.getTransactionReceipt(tx_hash)
+        'chainId': network_id,
+        'gas': 1500000,
+        'gasPrice': gas_price,
+        'nonce': nonce,
+        }) #transact()
+    signed_tx = w3.eth.account.sign_transaction(tx, private_key)
+    tx_hash = w3.eth.sendRawTransaction(signed_tx.rawTransaction)
+    last_tx = tx_hash
+    rcpt = waitFor(tx_hash)
+    if rcpt['status'] == 0:
+        logg.critial('constructor transaction failed {}'.format(tx_hash))
+        sys.exit(1)
+    else:
+        logg.info('constructor succeeded. gas used: {}'.format(rcpt['gasUsed']))
+
     address = rcpt.contractAddress
+    logg.debug('token contract mined {} {} {} {}'.format(address, args.n, args.s, args.d))
     c = w3.eth.contract(abi=abi, address=address)
 
-    logg.debug('construct tx {} address {}'.format(tx_hash.hex(), address))
+    balance = c.functions.balanceOf(signer_address).call()
+    logg.info('balance {}: {} {}'.format(signer_address, balance, tx_hash.hex()))
 
-    balance = c.functions.balanceOf(w3.eth.defaultAccount).call()
+    if args.account != None:
-    logg.info('balance {}: {} {}'.format(w3.eth.defaultAccount, balance, tx_hash))
+        for a in args.account:
-
+            if a == signer_address:
-
-    if args.a != None:
-        for a in args.a:
-            if a == w3.eth.defaultAccount:
                 continue
-            tx_hash_mint = c.functions.mint(args.amount).transact()
+            nonce += 1
-            tx_hash_transfer = c.functions.transfer(a, args.amount).transact()
+            tx = c.functions.mint(args.amount).buildTransaction({
-            rcpt = w3.eth.getTransactionReceipt(tx_hash)
+                'chainId': network_id,
+                'gas': 70000,
+                'gasPrice': gas_price,
+                'nonce': nonce,
+                })
+
+            signed_tx = w3.eth.account.sign_transaction(tx, private_key)
+            tx_hash_mint = w3.eth.sendRawTransaction(signed_tx.rawTransaction)
+            last_tx = tx_hash_mint
+            logg.info('mint to {} tx {}'.format(a, tx_hash_mint.hex()))
+
+            if block_mode == 2:
+                rcpt = waitFor(tx_hash_mint)
+                if rcpt['status'] == 0:
+                    logg.error('mint failed: {}'.format(tx_hash_mint.hex()))
+                    if args.e:
+                        sys.exit(1)
+                else:
+                    logg.info('mint succeeded. gas used: {}'.format(rcpt['gasUsed']))
+
+            nonce += 1
+            tx = c.functions.transfer(a, args.amount).buildTransaction({
+                'chainId': network_id,
+                'gas': 40000,
+                'gasPrice':  gas_price,
+                'nonce': nonce,
+                })
+
+            signed_tx = w3.eth.account.sign_transaction(tx, private_key)
+            tx_hash_transfer = w3.eth.sendRawTransaction(signed_tx.rawTransaction)
+            last_tx = tx_hash_transfer
+            logg.info('trasnfer to {} tx {}'.format(a, tx_hash_mint.hex()))
+
+            if block_mode == 2:
+                rcpt = waitFor(tx_hash_transfer)
                 balance = c.functions.balanceOf(a).call()
                 logg.info('balance {}: {}'.format(a, balance))
+                if rcpt['status'] == 0:
+                    logg.error('transfer failed: {}'.format(tx_hash_mint.hex()))
+                    if args.e:
+                        sys.exit(1)
+                else:
+                    logg.info('transfer succeeded. gas used: {}'.format(rcpt['gasUsed']))
 
-    if args.m != None:
+    if args.minter != None:
-        for a in args.m:
+        for a in args.minter:
-            if a == w3.eth.defaultAccount:
+            if a == signer_address:
                 continue
-            tx_hash_minter = c.functions.addMinter(a).transact()
+            nonce += 1
-            logg.info('minter {}'.format(a))
+            tx = c.functions.addMinter(a).buildTransaction({
+                'chainId': network_id,
+                'gas': 50000,
+                'gasPrice': 1000000000000,
+                'nonce': nonce,
+                    })
+            signed_tx = w3.eth.account.sign_transaction(tx, private_key)
+            tx_hash_minter = w3.eth.sendRawTransaction(signed_tx.rawTransaction)
+            last_tx = tx_hash_minter
+            logg.info('minter add {} tx {}'.format(a, tx_hash_minter.hex()))
+            if block_mode == 2:
+                rcpt = waitFor(tx_hash_minter)
+                balance = c.functions.balanceOf(a).call()
+                if rcpt['status'] == 0:
+                    logg.error('minter add failed: {}'.format(tx_hash_minter))
+                    if args.e:
+                        sys.exit(1)
+                else:
+                    logg.info('minter add succeeded. gas used: {}'.format(rcpt['gasUsed']))
+
+    if block_mode > 0:
+        rcpt = waitFor(last_tx)
+        if rcpt['status'] == 0:
+            logg.error('failed: {}'.format(tx_hash_mint.hex()))
+            if args.e:
+                sys.exit(1)
 
     print(address)
+    sys.exit(0)
 
 
 if __name__ == '__main__':

python/giftable_erc20_token/runnable/gift.py

@@ -1,4 +1,5 @@
 """Mints and gifts tokens to a given address
+
 .. moduleauthor:: Louis Holbrook <dev@holbrook.no>
 .. pgp:: 0826EDA1702D1E87C6E2875121D2E7BB88C2A746 
 
@@ -7,13 +8,16 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # standard imports
+import sys
 import os
 import json
 import argparse
 import logging
+import time
 
 # third-party imports
 import web3
+from eth_keys import keys
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -26,36 +30,121 @@ 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('-t', '--token-address', required='True', dest='t', type=str, help='Giftable token address')
+argparser.add_argument('-e', action='store_true', help='Treat all transactions as essential')
-argparser.add_argument('-m', '--minter-address', dest='m', type=str, help='Minter account address')
+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('-a', '--token-address', required='True', dest='a', type=str, help='Giftable token address')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
 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('-r', '--recipient-address', dest='r', type=str, help='Recipient account address')
+argparser.add_argument('--recipient', type=str, help='Recipient account address. If not set, tokens will be gifted to the keystore account')
 argparser.add_argument('amount', type=int, help='Amount of tokens to mint and gift')
 args = argparser.parse_args()
 
 if args.v:
     logg.setLevel(logging.DEBUG)
 
+block_mode = 0
+if args.ww:
+    logg.debug('set block after each tx')
+    block_mode = 2
+elif args.w:
+    logg.debug('set block until last tx')
+    block_mode = 1
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+private_key = None
+signer_address = None
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    f = open(args.y, 'r')
+    encrypted_key = f.read()
+    f.close()
+    private_key = w3.eth.account.decrypt(encrypted_key, '')
+    private_key_object = keys.PrivateKey(private_key)
+    signer_address = private_key_object.public_key.to_checksum_address()
+    logg.debug('now have key for signer address {}'.format(signer_address))
+
+network_pair = args.i.split(':')
+network_id = int(network_pair[1])
+
+
+def waitFor(tx_hash):
+    i = 1
+    while True:
+        try:
+            return w3.eth.getTransactionReceipt(tx_hash)
+        except web3.exceptions.TransactionNotFound:
+            logg.debug('poll #{} for {}'.format(i, tx_hash.hex()))   
+            i += 1
+            time.sleep(1)
+
+
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
 
     f = open(os.path.join(args.abi_dir, 'GiftableToken.json'), 'r')
     abi = json.load(f)
     f.close()
 
-    c = w3.eth.contract(abi=abi, address=args.t)
+    gas_price = w3.eth.gasPrice
-    if args.m != None:
+
-        w3.eth.defaultAccount = web3.Web3.toChecksumAddress(args.m)
+    last_tx = None
+
+    nonce = w3.eth.getTransactionCount(signer_address, 'pending')
+
+    c = w3.eth.contract(abi=abi, address=args.a)
+
+    recipient = signer_address
+    if args.recipient != None:
+        recipient = args.recipient
+
+    tx = c.functions.mint(args.amount).buildTransaction({
+        'chainId': network_id,
+        'gas': 60000,
+        'gasPrice': gas_price,
+        'nonce': nonce,
+        })
+
+    signed_tx = w3.eth.account.sign_transaction(tx, private_key)
+    tx_hash_mint = w3.eth.sendRawTransaction(signed_tx.rawTransaction)
+    last_tx = tx_hash_mint
+    logg.info('mint to {} tx {}'.format(signer_address, tx_hash_mint.hex()))
+
+    if block_mode == 2:
+        rcpt = waitFor(tx_hash_mint)
+        if rcpt['status'] == 0:
+            logg.critical('mint failed: {}'.format(tx_hash_mint.hex()))
+            sys.exit(1)
         else:
-        w3.eth.defaultAccount = w3.eth.accounts[0]
+            logg.info('mint succeeded. gas used: {}'.format(rcpt['gasUsed']))
 
-    recipient = w3.eth.defaultAccount
+    nonce += 1
-    if args.r != None:
-        recipient = web3.Web3.toChecksumAddress(args.r)
 
-    c.functions.mint(args.amount).transact()
+    tx = c.functions.transfer(recipient, args.amount).buildTransaction({
-    tx = c.functions.transfer(recipient, args.amount).transact()
+        'chainId': network_id,
+        'gas': 60000,
+        'gasPrice': gas_price,
+        'nonce': nonce,
+        })
 
-    print(tx.hex())
+    signed_tx = w3.eth.account.sign_transaction(tx, private_key)
+    tx_hash_mint = w3.eth.sendRawTransaction(signed_tx.rawTransaction)
+    last_tx = tx_hash_mint
+    logg.info('transfer to {} tx {}'.format(recipient, tx_hash_mint.hex()))
 
+    if block_mode > 0:
+        rcpt = waitFor(tx_hash_mint)
+        if rcpt['status'] == 0:
+            logg.error('trasnfer failed: {}'.format(tx_hash_mint.hex()))
+            sys.exit(1)
+        else:
+            logg.info('transfer succeeded. gas used: {}'.format(rcpt['gasUsed']))
+
+    print(last_tx.hex())
+    sys.exit(0)
+
+
+if __name__ == '__main__':
+    main()

python/setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = giftable-erc20-token
-version = 0.0.6
+version = 0.0.7a1
 description = Simple ERC20 contract with deployment script that lets any address mint and gift itself tokens.
 author = Louis Holbrook
 author_email = dev@holbrook.no

solidity/GiftableToken.json

@@ -1 +1 @@
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solidity/GiftableToken.sol

@@ -1,4 +1,4 @@
-pragma solidity >=0.6.12;
+pragma solidity >0.6.11;
 
 // SPDX-License-Identifier: GPL-3.0-or-later
 

solidity/Makefile

@@ -1,7 +1,10 @@
+#SOLC = /home/lash/build/solidity/build/solc/solc
+SOLC = /usr/bin/solc
+
 all:
-	solc --bin GiftableToken.sol | awk 'NR>3' > GiftableToken.bin
+	$(SOLC) --bin GiftableToken.sol --evm-version byzantium | awk 'NR>3' > GiftableToken.bin
 	truncate -s -1 GiftableToken.bin
-	solc --abi GiftableToken.sol | awk 'NR>3' > GiftableToken.abi.json
+	$(SOLC) --abi GiftableToken.sol --evm-version byzantium | awk 'NR>3' > GiftableToken.json
 
 install: all
 	cp -v *{json,bin} ../python/giftable_erc20_token/data/