diff --git a/CHANGELOG b/CHANGELOG
index 3c5a15c..2dbb5f2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,7 @@
 	- Add transaction executor helper, with adapter helper for eth
 	- Fix bitlength of integers in all tx fields before rlp encoding
 	- Add tcp server
+	- Fix RLP encoding bug on signature elements with 0x00 in first position
 * 0.4.12
 	- Enforce hex strings in signer backend for sign message
 * 0.4.11
diff --git a/crypto_dev_signer/eth/signer/defaultsigner.py b/crypto_dev_signer/eth/signer/defaultsigner.py
index 551b023..297a11d 100644
--- a/crypto_dev_signer/eth/signer/defaultsigner.py
+++ b/crypto_dev_signer/eth/signer/defaultsigner.py
@@ -40,6 +40,10 @@ class ReferenceSigner(Signer):
         tx.v = v.to_bytes(int(byts), 'big')
         tx.r = z[:32]
         tx.s = z[32:64]
+        if tx.r[0] == 0:
+            tx.r = tx.r[1:]
+        if tx.s[0] == 0:
+            tx.r = tx.s[1:]
         return z
 
 
diff --git a/scripts/generate.py b/scripts/generate.py
new file mode 100644
index 0000000..1dc2cd5
--- /dev/null
+++ b/scripts/generate.py
@@ -0,0 +1,152 @@
+import uuid
+import random
+import json
+import os
+import logging
+import time
+import sha3
+import sys
+from urllib.request import Request, urlopen
+
+from crypto_dev_signer.keystore import keyapi
+from crypto_dev_signer.eth.transaction import EIP155Transaction
+from crypto_dev_signer.eth.signer.defaultsigner import ReferenceSigner
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+pk_input = sys.argv[1]
+
+
+class pkGetter:
+
+    def __init__(self, pk):
+        self.pk = pk
+
+    def get(self, address, password=None):
+        return self.pk
+
+
+def init(pk_hex):
+    pk_bytes = bytes.fromhex(pk_hex)
+    pk = keyapi.PrivateKey(pk_bytes)
+
+    pubk = keyapi.private_key_to_public_key(pk)
+    address_hex = pubk.to_checksum_address()
+
+    pk_getter = pkGetter(pk_bytes)
+    
+    signer = ReferenceSigner(pk_getter)
+
+    return (signer, address_hex,)
+
+
+def main():
+    random.seed()
+
+    (signer, address) = init(pk_input)
+
+    req = Request('http://localhost:63545')
+    req.add_header('Content-Type', 'application/json')
+    o = {
+        'jsonrpc': '2.0',
+        'method': 'eth_getTransactionCount',
+        'id': str(uuid.uuid4()),
+        'params': [
+            address,
+            'pending',
+            ],
+            }
+    res = urlopen(req, json.dumps(o).encode('utf-8'))
+    o = json.loads(res.read().decode('utf-8'))
+    hx = o['result'][2:]
+    if len(hx) % 2 != 0:
+        hx = '0' + hx
+    nonce = int.from_bytes(bytes.fromhex(hx), 'big')
+    logg.debug('using nonce {} for {}'.format(nonce, address))
+
+    i = 0
+    offset = nonce
+    while True:
+        gas_price = random.randint(1, 20) * 1000000000
+        gas_limit = random.randint(21000, 8000000)
+        to = '0x' + os.urandom(20).hex()
+        value = random.randint(0, 2) * 100
+        data = '0x'
+        if value > 0:
+            data += os.urandom(128).hex()
+
+        tx = {
+            'nonce': nonce,
+            'from': "0xEB014f8c8B418Db6b45774c326A0E64C78914dC0",
+            'gasPrice': gas_price,
+            'gas': gas_limit,
+            'to': to,
+            'value': value,
+            'data': data,
+            'chainId': 8996,
+        }
+        
+        txe = EIP155Transaction(tx, nonce, 8996)
+
+        sign_and_send(signer, txe)
+
+        nonce += 1
+        i += 1
+
+        logg.debug('tx {} ({}) ok'.format(nonce - offset + 1, nonce))
+
+        if i == 100:
+            logg.info('waiting a bit for node to catch up')
+            time.sleep(7)
+            i = 0
+
+
+def sign_and_send(signer, txe, save=True):
+
+        signer.signTransaction(txe)
+        tx_raw = txe.rlp_serialize()
+        
+        h = sha3.keccak_256()
+        h.update(tx_raw)
+        tx_hash = h.digest().hex()
+
+        if save:
+            f = open(os.path.join('tmp', tx_hash), 'w')
+            f.write(str(txe.serialize()) + '\n')
+            f.write(tx_raw.hex())
+            f.close()
+        logg.info('sending tx {}'.format(tx_hash))
+
+        req = Request('http://localhost:63545')
+        req.add_header('Content-Type', 'application/json')
+        o = {
+            'jsonrpc': '2.0',
+            'method': 'eth_sendRawTransaction',
+            'id': str(uuid.uuid4()),
+            'params': [
+                '0x' + tx_raw.hex(),
+                ],
+                }
+        res = urlopen(req, json.dumps(o).encode('utf-8'))
+        o = json.loads(res.read().decode('utf-8'))
+        logg.debug('response: {}'.format(o))
+        if o.get('error') != None:
+            logg.error('error: {}'.format(o.get('error')))
+            sys.exit(1)
+
+
+def redo():
+
+        (signer, address) = init(pk_input)
+
+        tx = {'nonce': 510, 'from': '0xEB014f8c8B418Db6b45774c326A0E64C78914dC0', 'gasPrice': 5000000000, 'gas': 6608539, 'to': '0x7fe37d3341b6044a3d9d84607b885db2a8ffda17', 'value': 100, 'data': '0xc2d9656585afddb615816c254fc99810e2b9bce6a27b7366f22c5e929960d7a8ce2d8a87d46826e6cee955d3594c772584712f6e11da929005b3b77bc0168f54ba6d38fbf3f9e9c5bf04abc799af46c34068998e14508135a3e9e6dda73bde0f306bf07c6e6558525f5d2744dc7c5ccc6161c2e7aad39214779a9dfb2ffdd466', 'chainId': 8996}
+
+        txe = EIP155Transaction(tx, tx['nonce'], tx['chainId'])
+
+        sign_and_send(signer, txe, save=False)
+                
+
+if __name__ == '__main__':
+    main()
+    #redo()
diff --git a/setup.py b/setup.py
index fddd67b..ade43f4 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ f.close()
 
 setup(
         name="crypto-dev-signer",
-        version="0.4.13b12",
+        version="0.4.13rc1",
         description="A signer and keystore daemon and library for cryptocurrency software development",
         author="Louis Holbrook",
         author_email="dev@holbrook.no",