diff --git a/lib/bitcoin.py b/lib/bitcoin.py
index 701bd237..0f4db57c 100644
--- a/lib/bitcoin.py
+++ b/lib/bitcoin.py
@@ -199,6 +199,9 @@ def op_push(i):
     else:
         return '4e' + int_to_hex(i,4)
 
+def push_script(x):
+    return op_push(len(x)//2) + x
+
 
 def sha256(x):
     x = to_bytes(x, 'utf8')
@@ -314,7 +317,24 @@ def public_key_to_p2pkh(public_key):
 def public_key_to_p2wpkh(public_key):
     return hash_160_to_bc_address(hash_160(public_key), ADDRTYPE_P2WPKH)
 
+def address_to_script(addr):
+    addrtype, hash_160 = bc_address_to_hash_160(addr)
+    if addrtype == ADDRTYPE_P2PKH:
+        script = '76a9'                                      # op_dup, op_hash_160
+        script += push_script(bh2u(hash_160))
+        script += '88ac'                                     # op_equalverify, op_checksig
+    elif addrtype == ADDRTYPE_P2SH:
+        script = 'a9'                                        # op_hash_160
+        script += push_script(bh2u(hash_160))
+        script += '87'                                       # op_equal
+    else:
+        raise BaseException('unknown address type')
+    return script
 
+def address_to_scripthash(addr):
+    script = address_to_script(addr)
+    h = sha256(bytes.fromhex(script))[0:32]
+    return bytes(reversed(h)).hex()
 
 
 __b58chars = b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
diff --git a/lib/transaction.py b/lib/transaction.py
index d5ee000b..b4c4935f 100644
--- a/lib/transaction.py
+++ b/lib/transaction.py
@@ -456,23 +456,8 @@ def deserialize(raw):
 
 # pay & redeem scripts
 
-def push_script(x):
-    return op_push(len(x)//2) + x
 
 
-def get_scriptPubKey(addr):
-    addrtype, hash_160 = bc_address_to_hash_160(addr)
-    if addrtype == bitcoin.ADDRTYPE_P2PKH:
-        script = '76a9'                                      # op_dup, op_hash_160
-        script += push_script(bh2u(hash_160))
-        script += '88ac'                                     # op_equalverify, op_checksig
-    elif addrtype == bitcoin.ADDRTYPE_P2SH:
-        script = 'a9'                                        # op_hash_160
-        script += push_script(bh2u(hash_160))
-        script += '87'                                       # op_equal
-    else:
-        raise BaseException('unknown address type')
-    return script
 
 
 def segwit_script(pubkey):
@@ -601,7 +586,7 @@ class Transaction:
         if output_type == TYPE_SCRIPT:
             return bh2u(addr)
         elif output_type == TYPE_ADDRESS:
-            return get_scriptPubKey(addr)
+            return bitcoin.address_to_script(addr)
         else:
             raise TypeError('Unknown output type')
         return script
@@ -667,7 +652,7 @@ class Transaction:
     def get_preimage_script(self, txin):
         # only for non-segwit
         if txin['type'] == 'p2pkh':
-            return get_scriptPubKey(txin['address'])
+            return bitcoin.address_to_script(txin['address'])
         elif txin['type'] == 'p2sh':
             pubkeys, x_pubkeys = self.get_sorted_pubkeys(txin)
             return multisig_script(pubkeys, txin['num_sig'])
diff --git a/lib/wallet.py b/lib/wallet.py
index c6bafb29..287e3ddc 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -883,7 +883,7 @@ class Abstract_Wallet(PrintError):
             pubkey = public_key_from_private_key(privkey)
             address = address_from_private_key(privkey)
             u = network.synchronous_get(('blockchain.address.listunspent', [address]))
-            pay_script = transaction.get_scriptPubKey(address)
+            pay_script = bitcoin.address_to_script(address)
             for item in u:
                 if len(inputs) >= imax:
                     break