diff --git a/pybitcoin/privatekey.py b/pybitcoin/privatekey.py
index 5b1c99b..47b9cbf 100644
--- a/pybitcoin/privatekey.py
+++ b/pybitcoin/privatekey.py
@@ -13,7 +13,7 @@
 import ecdsa
 from binascii import hexlify, unhexlify
 from ecdsa.keys import SigningKey
-from utilitybelt import is_int, dev_random_entropy, dev_urandom_entropy
+from utilitybelt import is_int, dev_urandom_entropy
 from bitcoin import compress, encode_privkey, get_privkey_format
 
 from .errors import _errors
@@ -29,7 +29,7 @@ def random_secret_exponent(curve_order):
     # than the curve order
     while True:
         # generate a random 256 bit hex string
-        random_hex = hexlify(dev_random_entropy(32))
+        random_hex = hexlify(dev_urandom_entropy(32))
         random_int = int(random_hex, 16)
         if random_int >= 1 and random_int < curve_order:
             break
diff --git a/pybitcoin/services/blockchain_info.py b/pybitcoin/services/blockchain_info.py
index c99b149..be90bfa 100644
--- a/pybitcoin/services/blockchain_info.py
+++ b/pybitcoin/services/blockchain_info.py
@@ -15,8 +15,9 @@
 from .blockchain_client import BlockchainClient
 
 class BlockchainInfoClient(BlockchainClient):
-    def __init__(self, api_key=None):
+    def __init__(self, api_key=None, timeout=30):
         self.type = 'blockchain.info'
+        self.timeout = timeout
         if api_key:
             self.auth = (api_key, '')
         else:
@@ -46,7 +47,7 @@ def get_unspents(address, blockchain_client=BlockchainInfoClient()):
     if auth and len(auth) == 2 and isinstance(auth[0], str):
         url = url + "&api_code=" + auth[0]
 
-    r = requests.get(url, auth=auth)
+    r = requests.get(url, auth=auth, timeout=blockchain_client.timeout)
     try:
         unspents = r.json()["unspent_outputs"]
     except ValueError, e:
@@ -59,7 +60,7 @@ def broadcast_transaction(hex_tx, blockchain_client=BlockchainInfoClient()):
     """
     url = BLOCKCHAIN_API_BASE_URL + '/pushtx'
     payload = {'tx': hex_tx}
-    r = requests.post(url, data=payload, auth=blockchain_client.auth)
+    r = requests.post(url, data=payload, auth=blockchain_client.auth, timeout=blockchain_client.timeout)
     
     if 'submitted' in r.text.lower():
         return {'success': True}
diff --git a/pybitcoin/services/blockcypher.py b/pybitcoin/services/blockcypher.py
index 7d486d7..6d8818d 100644
--- a/pybitcoin/services/blockcypher.py
+++ b/pybitcoin/services/blockcypher.py
@@ -17,13 +17,15 @@
 
 
 class BlockcypherClient(BlockchainClient):
-    def __init__(self, api_key=None):
+    def __init__(self, api_key=None, timeout=30):
         self.type = 'blockcypher.com'
         if api_key:
             self.auth = (api_key, '')
         else:
             self.auth = None
 
+        self.timeout = timeout
+
 
 def format_unspents(unspents):
 
@@ -52,9 +54,9 @@ def get_unspents(address, blockchain_client=BlockcypherClient()):
           BLOCKCYPHER_BASE_URL, address)
 
     if blockchain_client.auth:
-        r = requests.get(url + '&token=' + blockchain_client.auth[0])
+        r = requests.get(url + '&token=' + blockchain_client.auth[0], timeout=blockchain_client.timeout)
     else:
-        r = requests.get(url)
+        r = requests.get(url, timeout=blockchain_client.timeout)
 
     try:
         unspents = r.json()
@@ -74,7 +76,7 @@ def broadcast_transaction(hex_tx, blockchain_client):
 
     url = '%s/txs/push' % (BLOCKCYPHER_BASE_URL)
     payload = json.dumps({'tx': hex_tx})
-    r = requests.post(url, data=payload)
+    r = requests.post(url, data=payload, timeout=blockchain_client.timeout)
 
     try:
         data = r.json()
diff --git a/pybitcoin/services/chain_com.py b/pybitcoin/services/chain_com.py
index 9690319..70aae86 100644
--- a/pybitcoin/services/chain_com.py
+++ b/pybitcoin/services/chain_com.py
@@ -14,8 +14,9 @@
 from .blockchain_client import BlockchainClient
 
 class ChainComClient(BlockchainClient):
-    def __init__(self, api_key_id=None, api_key_secret=None):
+    def __init__(self, api_key_id=None, api_key_secret=None, timeout=30):
         self.type = 'chain.com'
+        self.timeout = timeout
         if api_key_id and api_key_secret:
             self.auth = (api_key_id, api_key_secret)
         else:
@@ -45,9 +46,9 @@ def get_unspents(address, blockchain_client=ChainComClient()):
 
     auth = blockchain_client.auth
     if auth:
-        r = requests.get(url, auth=auth)
+        r = requests.get(url, auth=auth, timeout=blockchain_client.timeout)
     else:
-        r = requests.get(url + '?api-key-id=DEMO-4a5e1e4')
+        r = requests.get(url + '?api-key-id=DEMO-4a5e1e4', timeout=blockchain_client.timeout)
 
     try:
         unspents = r.json()
@@ -68,7 +69,7 @@ def broadcast_transaction(hex_tx, blockchain_client):
 
     url = CHAIN_API_BASE_URL + '/bitcoin/transactions/send'
     payload = json.dumps({ 'signed_hex': hex_tx })
-    r = requests.post(url, data=payload, auth=auth)
+    r = requests.post(url, data=payload, auth=auth, timeout=blockchain_client.timeout)
 
     try:
         data = r.json()