change estimated_fee to include 34 bytes per output instead of hard-coded 80 (issue...
[electrum-nvc.git] / lib / wallet.py
index 60d38f8..3948a95 100644 (file)
@@ -29,11 +29,16 @@ import random
 import aes
 import Queue
 import time
+import math
 
 from util import print_msg, print_error, format_satoshis
 from bitcoin import *
 from account import *
 from transaction import Transaction
+from plugins import run_hook
+
+COINBASE_MATURITY = 100
+DUST_THRESHOLD = 5430
 
 # AES encryption
 EncodeAES = lambda secret, s: base64.b64encode(aes.encryptData(secret,s))
@@ -51,8 +56,8 @@ def pw_decode(s, password):
         secret = Hash(password)
         try:
             d = DecodeAES(secret, s)
-        except:
-            raise BaseException('Invalid password')
+        except Exception:
+            raise Exception('Invalid password')
         return d
     else:
         return s
@@ -61,15 +66,17 @@ def pw_decode(s, password):
 
 
 
-from version import ELECTRUM_VERSION, SEED_VERSION
+from version import *
 
 
 class WalletStorage:
 
     def __init__(self, config):
+        self.lock = threading.Lock()
+        self.config = config
         self.data = {}
         self.file_exists = False
-        self.init_path(config)
+        self.path = self.init_path(config)
         print_error( "wallet path", self.path )
         if self.path:
             self.read(self.path)
@@ -78,14 +85,29 @@ class WalletStorage:
     def init_path(self, config):
         """Set the path of the wallet."""
 
+        # command line -w option
         path = config.get('wallet_path')
-        if not path:
-            path = config.get('default_wallet_path')
-        if path is not None:
-            self.path = path
-            return
+        if path:
+            return path
+
+        # path in config file
+        path = config.get('default_wallet_path')
+        if path:
+            return path
+
+        # default path
+        dirpath = os.path.join(config.path, "wallets")
+        if not os.path.exists(dirpath):
+            os.mkdir(dirpath)
+
+        new_path = os.path.join(config.path, "wallets", "default_wallet")
+
+        # default path in pre 1.9 versions
+        old_path = os.path.join(config.path, "electrum.dat")
+        if os.path.exists(old_path) and not os.path.exists(new_path):
+            os.rename(old_path, new_path)
 
-        self.path = os.path.join(config.path, "electrum.dat")
+        return new_path
 
 
     def read(self, path):
@@ -97,7 +119,7 @@ class WalletStorage:
             return
         try:
             d = ast.literal_eval( data )  #parse raw data from reading wallet file
-        except:
+        except Exception:
             raise IOError("Cannot read wallet file.")
 
         self.data = d
@@ -105,31 +127,35 @@ class WalletStorage:
 
 
     def get(self, key, default=None):
-        return self.data.get(key, default)
+        v = self.data.get(key)
+        if v is None: 
+            v = default
+        return v
 
     def put(self, key, value, save = True):
 
-        if self.data.get(key) is not None:
-            self.data[key] = value
-        else:
-            # add key to wallet config
-            self.data[key] = value
-
-        if save: 
-            self.write()
-
+        with self.lock:
+            if value is not None:
+                self.data[key] = value
+            else:
+                self.data.pop(key)
+            if save: 
+                self.write()
 
     def write(self):
         s = repr(self.data)
         f = open(self.path,"w")
         f.write( s )
         f.close()
-        if self.get('gui') != 'android':
+        if 'ANDROID_DATA' not in os.environ:
             import stat
             os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 
 
-class Wallet:
+
+    
+
+class NewWallet:
 
     def __init__(self, storage):
 
@@ -138,7 +164,7 @@ class Wallet:
         self.gap_limit_for_change = 3 # constant
 
         # saved fields
-        self.seed_version          = storage.get('seed_version', SEED_VERSION)
+        self.seed_version          = storage.get('seed_version', NEW_SEED_VERSION)
 
         self.gap_limit             = storage.get('gap_limit', 5)
         self.use_change            = storage.get('use_change',True)
@@ -146,7 +172,6 @@ class Wallet:
         self.seed                  = storage.get('seed', '')               # encrypted
         self.labels                = storage.get('labels', {})
         self.frozen_addresses      = storage.get('frozen_addresses',[])
-        self.prioritized_addresses = storage.get('prioritized_addresses',[])
         self.addressbook           = storage.get('contacts', [])
 
         self.imported_keys         = storage.get('imported_keys',{})
@@ -159,8 +184,9 @@ class Wallet:
 
         self.next_addresses = storage.get('next_addresses',{})
 
-        if self.seed_version < 4:
-            raise ValueError("This wallet seed is deprecated.")
+
+        # This attribute is set when wallet.start_threads is called.
+        self.synchronizer = None
 
         self.load_accounts()
 
@@ -169,7 +195,7 @@ class Wallet:
         for k,v in tx_list.items():
             try:
                 tx = Transaction(v)
-            except:
+            except Exception:
                 print_msg("Warning: Cannot deserialize transactions. skipping")
                 continue
 
@@ -230,18 +256,20 @@ class Wallet:
 
     def import_key(self, sec, password):
         # check password
-        seed = self.decode_seed(password)
+        seed = self.get_seed(password)
         try:
             address = address_from_private_key(sec)
-        except:
-            raise BaseException('Invalid private key')
+        except Exception:
+            raise Exception('Invalid private key')
 
         if self.is_mine(address):
-            raise BaseException('Address already in wallet')
+            raise Exception('Address already in wallet')
         
         # store the originally requested keypair into the imported keys table
         self.imported_keys[address] = pw_encode(sec, password )
         self.storage.put('imported_keys', self.imported_keys, True)
+        if self.synchronizer:
+            self.synchronizer.subscribe_to_addresses([address])
         return address
         
     def delete_imported_key(self, addr):
@@ -250,63 +278,100 @@ class Wallet:
             self.storage.put('imported_keys', self.imported_keys, True)
 
 
+    def make_seed(self):
+        import mnemonic, ecdsa
+        entropy = ecdsa.util.randrange( pow(2,160) )
+        nonce = 0
+        while True:
+            ss = "%040x"%(entropy+nonce)
+            s = hashlib.sha256(ss.decode('hex')).digest().encode('hex')
+            # we keep only 13 words, that's approximately 139 bits of entropy
+            words = mnemonic.mn_encode(s)[0:13] 
+            seed = ' '.join(words)
+            if is_seed(seed):
+                break  # this will remove 8 bits of entropy
+            nonce += 1
+
+        return seed
+
+
     def init_seed(self, seed):
-        if self.seed: raise BaseException("a seed exists")
-        if not seed: 
-            seed = random_seed(128)
-        self.seed = seed
+        import mnemonic, unicodedata
+        
+        if self.seed: 
+            raise Exception("a seed exists")
+
+        self.seed_version = NEW_SEED_VERSION
+
+        if not seed:
+            self.seed = self.make_seed()
+            return
+
+        self.seed = unicodedata.normalize('NFC', unicode(seed.strip()))
 
+            
 
-    def save_seed(self):
+    def save_seed(self, password):
+        if password: 
+            self.seed = pw_encode( self.seed, password)
+            self.use_encryption = True
         self.storage.put('seed', self.seed, True)
         self.storage.put('seed_version', self.seed_version, True)
+        self.storage.put('use_encryption', self.use_encryption,True)
+        self.create_accounts(password)
 
-    def create_watching_only_wallet(self, c0, K0):
-        cK0 = ""
+
+    def create_watching_only_wallet(self, K0, c0):
+        cK0 = "" #FIXME
         self.master_public_keys = {
             "m/0'/": (c0, K0, cK0),
             }
         self.storage.put('master_public_keys', self.master_public_keys, True)
-        self.create_account('1','Main account')
+        self.storage.put('seed_version', self.seed_version, True)
+        self.create_account('1of1','Main account')
 
-    def create_accounts(self):
 
-        master_k, master_c, master_K, master_cK = bip32_init(self.seed)
-        
-        # normal accounts
-        k0, c0, K0, cK0 = bip32_private_derivation(master_k, master_c, "m/", "m/0'/")
-        # p2sh 2of2
-        k1, c1, K1, cK1 = bip32_private_derivation(master_k, master_c, "m/", "m/1'/")
-        k2, c2, K2, cK2 = bip32_private_derivation(master_k, master_c, "m/", "m/2'/")
-        # p2sh 2of3
-        k3, c3, K3, cK3 = bip32_private_derivation(master_k, master_c, "m/", "m/3'/")
-        k4, c4, K4, cK4 = bip32_private_derivation(master_k, master_c, "m/", "m/4'/")
-        k5, c5, K5, cK5 = bip32_private_derivation(master_k, master_c, "m/", "m/5'/")
+    def create_accounts(self, password):
+        seed = pw_decode(self.seed, password)
+        # create default account
+        self.create_master_keys('1of1', password)
+        self.create_account('1of1','Main account')
+
+
+    def create_master_keys(self, account_type, password):
+        master_k, master_c, master_K, master_cK = bip32_init(self.get_seed(password))
+        if account_type == '1of1':
+            k0, c0, K0, cK0 = bip32_private_derivation(master_k, master_c, "m/", "m/0'/")
+            self.master_public_keys["m/0'/"] = (c0, K0, cK0)
+            self.master_private_keys["m/0'/"] = pw_encode(k0, password)
+        elif account_type == '2of2':
+            k1, c1, K1, cK1 = bip32_private_derivation(master_k, master_c, "m/", "m/1'/")
+            k2, c2, K2, cK2 = bip32_private_derivation(master_k, master_c, "m/", "m/2'/")
+            self.master_public_keys["m/1'/"] = (c1, K1, cK1)
+            self.master_public_keys["m/2'/"] = (c2, K2, cK2)
+            self.master_private_keys["m/1'/"] = pw_encode(k1, password)
+            self.master_private_keys["m/2'/"] = pw_encode(k2, password)
+        elif account_type == '2of3':
+            k3, c3, K3, cK3 = bip32_private_derivation(master_k, master_c, "m/", "m/3'/")
+            k4, c4, K4, cK4 = bip32_private_derivation(master_k, master_c, "m/", "m/4'/")
+            k5, c5, K5, cK5 = bip32_private_derivation(master_k, master_c, "m/", "m/5'/")
+            self.master_public_keys["m/3'/"] = (c3, K3, cK3)
+            self.master_public_keys["m/4'/"] = (c4, K4, cK4)
+            self.master_public_keys["m/5'/"] = (c5, K5, cK5)
+            self.master_private_keys["m/3'/"] = pw_encode(k3, password)
+            self.master_private_keys["m/4'/"] = pw_encode(k4, password)
+            self.master_private_keys["m/5'/"] = pw_encode(k5, password)
 
-        self.master_public_keys = {
-            "m/0'/": (c0, K0, cK0),
-            "m/1'/": (c1, K1, cK1),
-            "m/2'/": (c2, K2, cK2),
-            "m/3'/": (c3, K3, cK3),
-            "m/4'/": (c4, K4, cK4),
-            "m/5'/": (c5, K5, cK5)
-            }
-        
-        self.master_private_keys = {
-            "m/0'/": k0,
-            "m/1'/": k1,
-            "m/2'/": k2,
-            "m/3'/": k3,
-            "m/4'/": k4,
-            "m/5'/": k5
-            }
-        
         self.storage.put('master_public_keys', self.master_public_keys, True)
         self.storage.put('master_private_keys', self.master_private_keys, True)
 
-        # create default account
-        self.create_account('1','Main account')
-
+    def has_master_public_keys(self, account_type):
+        if account_type == '1of1':
+            return "m/0'/" in self.master_public_keys
+        elif account_type == '2of2':
+            return set(["m/1'/", "m/2'/"]) <= set(self.master_public_keys.keys())
+        elif account_type == '2of3':
+            return set(["m/3'/", "m/4'/", "m/5'/"]) <= set(self.master_public_keys.keys())
 
     def find_root_by_master_key(self, c, K):
         for key, v in self.master_public_keys.items():
@@ -317,27 +382,32 @@ class Wallet:
 
     def deseed_root(self, seed, password):
         # for safety, we ask the user to enter their seed
-        assert seed == self.decode_seed(password)
+        assert seed == self.get_seed(password)
         self.seed = ''
         self.storage.put('seed', '', True)
 
 
     def deseed_branch(self, k):
         # check that parent has no seed
-        assert self.seed == ''
+        # assert self.seed == ''
         self.master_private_keys.pop(k)
         self.storage.put('master_private_keys', self.master_private_keys, True)
 
 
+    def is_watching_only(self):
+        return (self.seed == '') and (self.master_private_keys == {})
+
+
+
     def account_id(self, account_type, i):
-        if account_type == '1':
+        if account_type == '1of1':
             return "m/0'/%d"%i
         elif account_type == '2of2':
             return "m/1'/%d & m/2'/%d"%(i,i)
         elif account_type == '2of3':
             return "m/3'/%d & m/4'/%d & m/5'/%d"%(i,i,i)
         else:
-            raise BaseException('unknown account type')
+            raise Exception('unknown account type')
 
 
     def num_accounts(self, account_type):
@@ -350,7 +420,7 @@ class Wallet:
         return i
 
 
-    def new_account_address(self, account_type = '1'):
+    def new_account_address(self, account_type = '1of1'):
         i = self.num_accounts(account_type)
         k = self.account_id(account_type,i)
 
@@ -361,15 +431,15 @@ class Wallet:
             self.next_addresses[k] = addr
             self.storage.put('next_addresses',self.next_addresses)
 
-        return addr
+        return k, addr
 
 
-    def next_account(self, account_type = '1'):
+    def next_account(self, account_type = '1of1'):
 
         i = self.num_accounts(account_type)
         account_id = self.account_id(account_type,i)
 
-        if account_type is '1':
+        if account_type is '1of1':
             master_c0, master_K0, _ = self.master_public_keys["m/0'/"]
             c0, K0, cK0 = bip32_public_derivation(master_c0.decode('hex'), master_K0.decode('hex'), "m/0'/", "m/0'/%d"%i)
             account = BIP32_Account({ 'c':c0, 'K':K0, 'cK':cK0 })
@@ -393,24 +463,36 @@ class Wallet:
         return account_id, account
 
 
-    def set_label(self, key, value):
-        self.labels[key] = value
-        self.storage.put('labels', self.labels, True)
+    def set_label(self, name, text = None):
+        changed = False
+        old_text = self.labels.get(name)
+        if text:
+            if old_text != text:
+                self.labels[name] = text
+                changed = True
+        else:
+            if old_text:
+                self.labels.pop(name)
+                changed = True
 
+        if changed:
+            self.storage.put('labels', self.labels, True)
 
-    def create_account(self, account_type = '1', name = None):
-        account_id, account = self.next_account(account_type)
-        self.accounts[account_id] = account
-        self.save_accounts()
-        if name:
-            self.set_label(account_id, name)
+        run_hook('set_label', name, text, changed)
+        return changed
 
 
-    def create_old_account(self):
-        mpk = OldAccount.mpk_from_seed(self.seed)
-        self.storage.put('master_public_key', mpk, True)
-        self.accounts[0] = OldAccount({'mpk':mpk, 0:[], 1:[]})
+
+    def create_account(self, account_type = '1of1', name = None):
+        k, account = self.next_account(account_type)
+        if k in self.pending_accounts:
+            self.pending_accounts.pop(k)
+            self.storage.put('pending_accounts', self.pending_accounts)
+
+        self.accounts[k] = account
         self.save_accounts()
+        if name:
+            self.set_label(k, name)
 
 
     def save_accounts(self):
@@ -433,13 +515,32 @@ class Wallet:
             else:
                 self.accounts[k] = BIP32_Account(v)
 
+        self.pending_accounts = self.storage.get('pending_accounts',{})
+
+
+    def delete_pending_account(self, k):
+        self.pending_accounts.pop(k)
+        self.storage.put('pending_accounts', self.pending_accounts)
 
-    def addresses(self, include_change = True, next=False):
+    def account_is_pending(self, k):
+        return k in self.pending_accounts
+
+    def create_pending_account(self, acct_type, name):
+        k, addr = self.new_account_address(acct_type)
+        self.set_label(k, name)
+        self.pending_accounts[k] = addr
+        self.storage.put('pending_accounts', self.pending_accounts)
+
+    def get_pending_accounts(self):
+        return self.pending_accounts.items()
+
+
+    def addresses(self, include_change = True, _next=True):
         o = self.get_account_addresses(-1, include_change)
         for a in self.accounts.keys():
             o += self.get_account_addresses(a, include_change)
 
-        if next:
+        if _next:
             for addr in self.next_addresses.values():
                 if addr not in o:
                     o += [addr]
@@ -458,20 +559,19 @@ class Wallet:
         return s[0] == 1
 
     def get_master_public_key(self):
-        if self.seed_version == 4:
-            return self.storage.get("master_public_key")
-        else:
-            c, K, cK = self.storage.get("master_public_keys")["m/0'/"]
-            return repr((c, K))
+        c, K, cK = self.storage.get("master_public_keys")["m/0'/"]
+        return repr((c, K))
 
     def get_master_private_key(self, account, password):
-        master_k = pw_decode( self.master_private_keys[account], password)
+        k = self.master_private_keys.get(account)
+        if not k: return
+        master_k = pw_decode( k, password)
         master_c, master_K, master_Kc = self.master_public_keys[account]
         try:
             K, Kc = get_pubkeys_from_secret(master_k.decode('hex'))
             assert K.encode('hex') == master_K
-        except:
-            raise BaseException("Invalid password")
+        except Exception:
+            raise Exception("Invalid password")
         return master_k
 
 
@@ -486,8 +586,37 @@ class Wallet:
                     if address == addr:
                         return account, (for_change, addresses.index(addr))
 
-        raise BaseException("Address not found", address)
+        for k,v in self.next_addresses.items():
+            if v == address:
+                return k, (0,0)
+
+        raise Exception("Address not found", address)
+
 
+    def getpubkeys(self, addr):
+        assert is_valid(addr) and self.is_mine(addr)
+        account, sequence = self.get_address_index(addr)
+        if account != -1:
+            a = self.accounts[account]
+            return a.get_pubkeys( sequence )
+
+
+    def get_roots(self, account):
+        roots = []
+        for a in account.split('&'):
+            s = a.strip()
+            m = re.match("(m/\d+'/)(\d+)", s)
+            roots.append( m.group(1) )
+        return roots
+
+    def is_seeded(self, account):
+        if type(account) is int:
+            return self.seed is not None
+
+        for root in self.get_roots(account):
+            if root not in self.master_private_keys.keys(): 
+                return False
+        return True
 
     def rebase_sequence(self, account, sequence):
         c, i = sequence
@@ -503,7 +632,9 @@ class Wallet:
 
     def get_keyID(self, account, sequence):
         if account == 0:
-            return 'old'
+            a, b = sequence
+            mpk = self.storage.get('master_public_key')
+            return 'old(%s,%d,%d)'%(mpk,a,b)
 
         rs = self.rebase_sequence(account, sequence)
         dd = []
@@ -514,25 +645,29 @@ class Wallet:
         return '&'.join(dd)
 
 
-    def get_public_key(self, address):
-        account, sequence = self.get_address_index(address)
-        return self.accounts[account].get_pubkey( *sequence )
+    def get_seed(self, password):
+        s = pw_decode(self.seed, password)
+        seed = mnemonic_to_seed(s,'').encode('hex')
+        return seed
 
 
-    def decode_seed(self, password):
-        seed = pw_decode(self.seed, password)
-        #todo:  #self.sequences[0].check_seed(seed)
-        return seed
+    def get_mnemonic(self, password):
+        return pw_decode(self.seed, password)
         
 
     def get_private_key(self, address, password):
+        if self.is_watching_only():
+            return []
+
+        # first check the provided password
+        seed = self.get_seed(password)
+        
         out = []
         if address in self.imported_keys.keys():
             out.append( pw_decode( self.imported_keys[address], password ) )
         else:
             account, sequence = self.get_address_index(address)
             if account == 0:
-                seed = self.decode_seed(password)
                 pk = self.accounts[account].get_private_key(seed, sequence)
                 out.append(pk)
                 return out
@@ -550,44 +685,24 @@ class Wallet:
         return out
 
 
+    def add_keypairs_from_wallet(self, tx, keypairs, password):
+        for txin in tx.inputs:
+            address = txin['address']
+            if not self.is_mine(address):
+                continue
+            private_keys = self.get_private_key(address, password)
+            for sec in private_keys:
+                pubkey = public_key_from_private_key(sec)
+                keypairs[ pubkey ] = sec
+                if address in self.imported_keys.keys():
+                    txin['redeemPubkey'] = pubkey
 
 
-    def signrawtransaction(self, tx, input_info, private_keys, password):
-
-        unspent_coins = self.get_unspent_coins()
-        seed = self.decode_seed(password)
-
-        # build a list of public/private keys
-        keypairs = {}
-        for sec in private_keys:
-            pubkey = public_key_from_private_key(sec)
-            keypairs[ pubkey ] = sec
-
+    def add_keypairs_from_KeyID(self, tx, keypairs, password):
+        # first check the provided password
+        seed = self.get_seed(password)
 
         for txin in tx.inputs:
-            # convert to own format
-            txin['tx_hash'] = txin['prevout_hash']
-            txin['index'] = txin['prevout_n']
-
-            for item in input_info:
-                if item.get('txid') == txin['tx_hash'] and item.get('vout') == txin['index']:
-                    txin['raw_output_script'] = item['scriptPubKey']
-                    txin['redeemScript'] = item.get('redeemScript')
-                    txin['KeyID'] = item.get('KeyID')
-                    break
-            else:
-                for item in unspent_coins:
-                    if txin['tx_hash'] == item['tx_hash'] and txin['index'] == item['index']:
-                        print_error( "tx input is in unspent coins" )
-                        txin['raw_output_script'] = item['raw_output_script']
-                        account, sequence = self.get_address_index(item['address'])
-                        if account != -1:
-                            txin['redeemScript'] = self.accounts[account].redeem_script(sequence)
-                        break
-                else:
-                    raise BaseException("Unknown transaction input. Please provide the 'input_info' parameter, or synchronize this wallet")
-
-            # if available, derive private_keys from KeyID
             keyid = txin.get('KeyID')
             if keyid:
                 roots = []
@@ -608,31 +723,52 @@ class Wallet:
                 account = self.accounts.get(account_id)
                 if not account: continue
                 addr = account.get_address(*sequence)
-                txin['address'] = addr
+                txin['address'] = addr # fixme: side effect
                 pk = self.get_private_key(addr, password)
                 for sec in pk:
                     pubkey = public_key_from_private_key(sec)
                     keypairs[pubkey] = sec
 
-            redeem_script = txin.get("redeemScript")
-            print_error( "p2sh:", "yes" if redeem_script else "no")
-            if redeem_script:
-                addr = hash_160_to_bc_address(hash_160(redeem_script.decode('hex')), 5)
-            else:
-                addr = transaction.get_address_from_output_script(txin["raw_output_script"].decode('hex'))
-            txin['address'] = addr
 
-            # add private keys that are in the wallet
-            pk = self.get_private_key(addr, password)
-            for sec in pk:
-                pubkey = public_key_from_private_key(sec)
-                keypairs[pubkey] = sec
-                if not redeem_script:
-                    txin['redeemPubkey'] = pubkey
 
-            print txin
+    def signrawtransaction(self, tx, input_info, private_keys, password):
+
+        # check that the password is correct
+        seed = self.get_seed(password)
+
+        # add input info
+        tx.add_input_info(input_info)
+
+        # add redeem script for coins that are in the wallet
+        # FIXME: add redeemPubkey too!
+        unspent_coins = self.get_unspent_coins()
+        for txin in tx.inputs:
+            for item in unspent_coins:
+                if txin['prevout_hash'] == item['prevout_hash'] and txin['prevout_n'] == item['prevout_n']:
+                    print_error( "tx input is in unspent coins" )
+                    txin['scriptPubKey'] = item['scriptPubKey']
+                    account, sequence = self.get_address_index(item['address'])
+                    if account != -1:
+                        txin['redeemScript'] = self.accounts[account].redeem_script(sequence)
+                        print_error("added redeemScript", txin['redeemScript'])
+                    break
+
+
+        # build a list of public/private keys
+        keypairs = {}
+
+        # add private keys from parameter
+        for sec in private_keys:
+            pubkey = public_key_from_private_key(sec)
+            keypairs[ pubkey ] = sec
+
+        # add private_keys from KeyID
+        self.add_keypairs_from_KeyID(tx, keypairs, password)
+
+        # add private keys from wallet
+        self.add_keypairs_from_wallet(tx, keypairs, password)
+        self.sign_transaction(tx, keypairs)
 
-        tx.sign( keypairs )
 
     def sign_message(self, address, message, password):
         keys = self.get_private_key(address, password)
@@ -642,13 +778,15 @@ class Wallet:
         compressed = is_compressed(sec)
         return key.sign_message(message, compressed, address)
 
-    def verify_message(self, address, signature, message):
-        try:
-            EC_KEY.verify_message(address, signature, message)
-            return True
-        except BaseException as e:
-            print_error("Verification error: {0}".format(e))
-            return False
+
+
+    def decrypt_message(self, pubkey, message, password):
+        address = public_key_to_bc_address(pubkey.decode('hex'))
+        keys = self.get_private_key(address, password)
+        secret = keys[0]
+        ec = regenerate_key(secret)
+        decrypted = ec.decrypt_message(message)
+        return decrypted[0]
 
 
     def change_gap_limit(self, value):
@@ -706,7 +844,7 @@ class Wallet:
             if tx_height == 0:
                 tx_age = 0
             else: 
-                tx_age = self.verifier.blockchain.height - tx_height + 1
+                tx_age = self.verifier.blockchain.height() - tx_height + 1
             if tx_age > age:
                 age = tx_age
         return age > 2
@@ -735,11 +873,14 @@ class Wallet:
 
 
     def create_pending_accounts(self):
-        for account_type in ['1','2of2','2of3']:
-            a = self.new_account_address(account_type)
+        for account_type in ['1of1','2of2','2of3']:
+            if not self.has_master_public_keys(account_type):
+                continue
+            k, a = self.new_account_address(account_type)
             if self.address_is_old(a):
                 print_error( "creating account", a )
                 self.create_account(account_type)
+                self.next_addresses.pop(k)
 
 
     def synchronize_account(self, account):
@@ -797,7 +938,7 @@ class Wallet:
 
     def get_address_flags(self, addr):
         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-" 
-        flags += "F" if addr in self.frozen_addresses else "P" if addr in self.prioritized_addresses else "-"
+        flags += "F" if addr in self.frozen_addresses else "-"
         return flags
         
 
@@ -861,15 +1002,23 @@ class Wallet:
 
 
     def get_account_name(self, k):
-        if k == 0:
-            if self.seed_version == 4: 
-                name = 'Main account'
+        default = "Unnamed account"
+        m = re.match("m/0'/(\d+)", k)
+        if m:
+            num = m.group(1)
+            if num == '0':
+                default = "Main account"
             else:
-                name = 'Old account'
-        else:
-            name = self.labels.get(k, 'Unnamed account')
+                default = "Account %s"%num
+                    
+        m = re.match("m/1'/(\d+) & m/2'/(\d+)", k)
+        if m:
+            num = m.group(1)
+            default = "2of2 account %s"%num
+        name = self.labels.get(k, default)
         return name
 
+
     def get_account_names(self):
         accounts = {}
         for k, account in self.accounts.items():
@@ -878,6 +1027,7 @@ class Wallet:
             accounts[-1] = 'Imported keys'
         return accounts
 
+
     def get_account_addresses(self, a, include_change=True):
         if a is None:
             o = self.addresses(True)
@@ -890,44 +1040,21 @@ class Wallet:
         return o
 
     def get_imported_balance(self):
-        cc = uu = 0
-        for addr in self.imported_keys.keys():
-            c, u = self.get_addr_balance(addr)
-            cc += c
-            uu += u
-        return cc, uu
+        return self.get_balance(self.imported_keys.keys())
 
     def get_account_balance(self, account):
-        if account is None:
-            return self.get_balance()
-        elif account == -1:
-            return self.get_imported_balance()
-        
-        conf = unconf = 0
-        for addr in self.get_account_addresses(account): 
-            c, u = self.get_addr_balance(addr)
-            conf += c
-            unconf += u
-        return conf, unconf
+        return self.get_balance(self.get_account_addresses(account))
 
     def get_frozen_balance(self):
-        conf = unconf = 0
-        for addr in self.frozen_addresses:
-            c, u = self.get_addr_balance(addr)
-            conf += c
-            unconf += u
-        return conf, unconf
-
+        return self.get_balance(self.frozen_addresses)
         
-    def get_balance(self):
+    def get_balance(self, domain=None):
+        if domain is None: domain = self.addresses(True)
         cc = uu = 0
-        for a in self.accounts.keys():
-            c, u = self.get_account_balance(a)
+        for addr in domain:
+            c, u = self.get_addr_balance(addr)
             cc += c
             uu += u
-        c, u = self.get_imported_balance()
-        cc += c
-        uu += u
         return cc, uu
 
 
@@ -939,42 +1066,48 @@ class Wallet:
             if h == ['*']: continue
             for tx_hash, tx_height in h:
                 tx = self.transactions.get(tx_hash)
-                if tx is None: raise BaseException("Wallet not synchronized")
-                for output in tx.d.get('outputs'):
+                if tx is None: raise Exception("Wallet not synchronized")
+                is_coinbase = tx.inputs[0].get('prevout_hash') == '0'*64
+                for o in tx.d.get('outputs'):
+                    output = o.copy()
                     if output.get('address') != addr: continue
-                    key = tx_hash + ":%d" % output.get('index')
+                    key = tx_hash + ":%d" % output.get('prevout_n')
                     if key in self.spent_outputs: continue
-                    output['tx_hash'] = tx_hash
-                    coins.append(output)
-        return coins
+                    output['prevout_hash'] = tx_hash
+                    output['height'] = tx_height
+                    output['coinbase'] = is_coinbase
+                    coins.append((tx_height, output))
 
+        # sort by age
+        if coins:
+            coins = sorted(coins)
+            if coins[-1][0] != 0:
+                while coins[0][0] == 0: 
+                    coins = coins[1:] + [ coins[0] ]
+        return [x[1] for x in coins]
 
 
-    def choose_tx_inputs( self, amount, fixed_fee, account = None ):
+    def choose_tx_inputs( self, amount, fixed_fee, num_outputs, domain = None ):
         """ todo: minimize tx size """
         total = 0
         fee = self.fee if fixed_fee is None else fixed_fee
-        domain = self.get_account_addresses(account)
-        coins = []
-        prioritized_coins = []
-        for i in self.frozen_addresses:
-            if i in domain: domain.remove(i)
+        if domain is None:
+            domain = self.addresses(True)
 
-        for i in self.prioritized_addresses:
+        for i in self.frozen_addresses:
             if i in domain: domain.remove(i)
 
         coins = self.get_unspent_coins(domain)
-        prioritized_coins = self.get_unspent_coins(self.prioritized_addresses)
-
         inputs = []
-        coins = prioritized_coins + coins
 
-        for item in coins: 
+        for item in coins:
+            if item.get('coinbase') and item.get('height') + COINBASE_MATURITY > self.network.blockchain.height():
+                continue
             addr = item.get('address')
             v = item.get('value')
             total += v
-            inputs.append( item )
-            fee = self.estimated_fee(inputs) if fixed_fee is None else fixed_fee
+            inputs.append(item)
+            fee = self.estimated_fee(inputs, num_outputs) if fixed_fee is None else fixed_fee
             if total >= amount + fee: break
         else:
             inputs = []
@@ -987,22 +1120,21 @@ class Wallet:
             self.fee = fee
             self.storage.put('fee_per_kb', self.fee, True)
         
-    def estimated_fee(self, inputs):
-        estimated_size =  len(inputs) * 180 + 80     # this assumes non-compressed keys
-        fee = self.fee * int(round(estimated_size/1024.))
-        if fee == 0: fee = self.fee
+    def estimated_fee(self, inputs, num_outputs):
+        estimated_size =  len(inputs) * 180 + num_outputs * 34    # this assumes non-compressed keys
+        fee = self.fee * int(math.ceil(estimated_size/1000.))
         return fee
 
 
-    def add_tx_change( self, inputs, outputs, amount, fee, total, change_addr=None, account=0 ):
+    def add_tx_change( self, inputs, outputs, amount, fee, total, change_addr=None):
         "add change to a transaction"
         change_amount = total - ( amount + fee )
-        if change_amount != 0:
+        if change_amount > DUST_THRESHOLD:
             if not change_addr:
-                if account is None: 
-                    # send change to one of the accounts involved in the tx
-                    address = inputs[0].get('address')
-                    account, _ = self.get_address_index(address)
+
+                # send change to one of the accounts involved in the tx
+                address = inputs[0].get('address')
+                account, _ = self.get_address_index(address)
 
                 if not self.use_change or account == -1:
                     change_addr = inputs[-1]['address']
@@ -1054,7 +1186,7 @@ class Wallet:
     def receive_history_callback(self, addr, hist):
 
         if not self.check_new_history(addr, hist):
-            raise BaseException("error: received history for %s is not consistent with known transactions"%addr)
+            raise Exception("error: received history for %s is not consistent with known transactions"%addr)
             
         with self.lock:
             self.history[addr] = hist
@@ -1068,6 +1200,9 @@ class Wallet:
 
 
     def get_tx_history(self, account=None):
+        if not self.verifier:
+            return []
+
         with self.transaction_lock:
             history = self.transactions.items()
             history.sort(key = lambda x: self.verifier.get_txpos(x[0]))
@@ -1143,27 +1278,32 @@ class Wallet:
         return default_label
 
 
-    def make_unsigned_transaction(self, outputs, fee=None, change_addr=None, account=None ):
+    def make_unsigned_transaction(self, outputs, fee=None, change_addr=None, domain=None ):
         for address, x in outputs:
-            assert is_valid(address)
+            assert is_valid(address), "Address " + address + " is invalid!"
         amount = sum( map(lambda x:x[1], outputs) )
-        inputs, total, fee = self.choose_tx_inputs( amount, fee, account )
+        inputs, total, fee = self.choose_tx_inputs( amount, fee, len(outputs), domain )
         if not inputs:
             raise ValueError("Not enough funds")
-        outputs = self.add_tx_change(inputs, outputs, amount, fee, total, change_addr, account)
+        self.add_input_info(inputs)
+        outputs = self.add_tx_change(inputs, outputs, amount, fee, total, change_addr)
         return Transaction.from_io(inputs, outputs)
 
 
-    def mktx(self, outputs, password, fee=None, change_addr=None, account=None ):
-        tx = self.make_unsigned_transaction(outputs, fee, change_addr, account)
-        self.sign_transaction(tx, password)
+    def mktx(self, outputs, password, fee=None, change_addr=None, domain= None ):
+        tx = self.make_unsigned_transaction(outputs, fee, change_addr, domain)
+        keypairs = {}
+        self.add_keypairs_from_wallet(tx, keypairs, password)
+        if keypairs:
+            self.sign_transaction(tx, keypairs)
         return tx
 
 
-    def sign_transaction(self, tx, password):
-        keypairs = {}
-        for i, txin in enumerate(tx.inputs):
+    def add_input_info(self, inputs):
+        for txin in inputs:
             address = txin['address']
+            if address in self.imported_keys.keys():
+                continue
             account, sequence = self.get_address_index(address)
             txin['KeyID'] = self.get_keyID(account, sequence)
             redeemScript = self.accounts[account].redeem_script(sequence)
@@ -1171,18 +1311,18 @@ class Wallet:
                 txin['redeemScript'] = redeemScript
             else:
                 txin['redeemPubkey'] = self.accounts[account].get_pubkey(*sequence)
-            private_keys = self.get_private_key(address, password)
-            for sec in private_keys:
-                pubkey = public_key_from_private_key(sec)
-                keypairs[ pubkey ] = sec
+
+
+    def sign_transaction(self, tx, keypairs):
         tx.sign(keypairs)
+        run_hook('sign_transaction', tx)
 
 
     def sendtx(self, tx):
         # synchronous
         h = self.send_tx(tx)
         self.tx_event.wait()
-        return self.receive_tx(h)
+        return self.receive_tx(h, tx)
 
     def send_tx(self, tx):
         # asynchronous
@@ -1190,22 +1330,23 @@ class Wallet:
         self.network.interface.send([('blockchain.transaction.broadcast', [str(tx)])], self.on_broadcast)
         return tx.hash()
 
-    def on_broadcast(self, i, result):
-        self.tx_result = result
+    def on_broadcast(self, i, r):
+        self.tx_result = r.get('result')
         self.tx_event.set()
 
-    def receive_tx(self,tx_hash):
+    def receive_tx(self, tx_hash, tx):
         out = self.tx_result 
         if out != tx_hash:
             return False, "error: " + out
+        run_hook('receive_tx', tx, self)
         return True, out
 
 
 
-    def update_password(self, seed, old_password, new_password):
+    def update_password(self, old_password, new_password):
         if new_password == '': new_password = None
-        # this will throw an exception if unicode cannot be converted
-        self.seed = pw_encode( seed, new_password)
+        decoded = self.get_seed(old_password)
+        self.seed = pw_encode( decoded, new_password)
         self.storage.put('seed', self.seed, True)
         self.use_encryption = (new_password != None)
         self.storage.put('use_encryption', self.use_encryption,True)
@@ -1225,7 +1366,6 @@ class Wallet:
 
     def freeze(self,addr):
         if self.is_mine(addr) and addr not in self.frozen_addresses:
-            self.unprioritize(addr)
             self.frozen_addresses.append(addr)
             self.storage.put('frozen_addresses', self.frozen_addresses, True)
             return True
@@ -1240,23 +1380,6 @@ class Wallet:
         else:
             return False
 
-    def prioritize(self,addr):
-        if self.is_mine(addr) and addr not in self.prioritized_addresses:
-            self.unfreeze(addr)
-            self.prioritized_addresses.append(addr)
-            self.storage.put('prioritized_addresses', self.prioritized_addresses, True)
-            return True
-        else:
-            return False
-
-    def unprioritize(self,addr):
-        if self.is_mine(addr) and addr in self.prioritized_addresses:
-            self.prioritized_addresses.remove(addr)
-            self.storage.put('prioritized_addresses', self.prioritized_addresses, True)
-            return True
-        else:
-            return False
-
 
     def set_verifier(self, verifier):
         self.verifier = verifier
@@ -1319,7 +1442,7 @@ class Wallet:
                     # assert not self.is_mine(_addr)
                     ext_requests.append( ('blockchain.address.get_history', [_addr]) )
 
-                ext_h = self.network.interface.synchronous_get(ext_requests)
+                ext_h = self.network.synchronous_get(ext_requests)
                 print_error("sync:", ext_requests, ext_h)
                 height = None
                 for h in ext_h:
@@ -1361,16 +1484,51 @@ class Wallet:
     def start_threads(self, network):
         from verifier import TxVerifier
         self.network = network
-        self.verifier = TxVerifier(self.network, self.storage)
-        self.verifier.start()
-        self.set_verifier(self.verifier)
-        self.synchronizer = WalletSynchronizer(self)
-        self.synchronizer.start()
+        if self.network is not None:
+            self.verifier = TxVerifier(self.network, self.storage)
+            self.verifier.start()
+            self.set_verifier(self.verifier)
+            self.synchronizer = WalletSynchronizer(self, network)
+            self.synchronizer.start()
+        else:
+            self.verifier = None
+            self.synchronizer =None
 
     def stop_threads(self):
-        self.verifier.stop()
-        self.synchronizer.stop()
-
+        if self.network:
+            self.verifier.stop()
+            self.synchronizer.stop()
+
+
+    def restore(self, callback):
+        from i18n import _
+        def wait_for_wallet():
+            self.set_up_to_date(False)
+            while not self.is_up_to_date():
+                msg = "%s\n%s %d\n%s %.1f"%(
+                    _("Please wait..."),
+                    _("Addresses generated:"),
+                    len(self.addresses(True)), 
+                    _("Kilobytes received:"), 
+                    self.network.interface.bytes_received/1024.)
+
+                apply(callback, (msg,))
+                time.sleep(0.1)
+
+        def wait_for_network():
+            while not self.network.is_connected():
+                msg = "%s \n" % (_("Connecting..."))
+                apply(callback, (msg,))
+                time.sleep(0.1)
+
+        # wait until we are connected, because the user might have selected another server
+        if self.network:
+            wait_for_network()
+            wait_for_wallet()
+        else:
+            self.synchronize()
+            
+        self.fill_addressbook()
 
 
 
@@ -1378,13 +1536,11 @@ class Wallet:
 class WalletSynchronizer(threading.Thread):
 
 
-    def __init__(self, wallet):
+    def __init__(self, wallet, network):
         threading.Thread.__init__(self)
         self.daemon = True
         self.wallet = wallet
-        wallet.synchronizer = self
-        self.network = self.wallet.network
-        #self.wallet.network.register_callback('connected', lambda: self.wallet.set_up_to_date(False))
+        self.network = network
         self.was_updated = True
         self.running = False
         self.lock = threading.Lock()
@@ -1401,7 +1557,7 @@ class WalletSynchronizer(threading.Thread):
         messages = []
         for addr in addresses:
             messages.append(('blockchain.address.subscribe', [addr]))
-        self.network.interface.send( messages, lambda i,r: self.queue.put(r))
+        self.network.subscribe( messages, lambda i,r: self.queue.put(r))
 
 
     def run(self):
@@ -1409,17 +1565,16 @@ class WalletSynchronizer(threading.Thread):
             self.running = True
 
         while self.is_running():
-            interface = self.network.interface
-            if not interface.is_connected:
-                print_error("synchronizer: waiting for interface")
-                interface.connect_event.wait()
+
+            if not self.network.is_connected():
+                self.network.wait_until_connected()
                 
-            self.run_interface(interface)
+            self.run_interface()
 
 
-    def run_interface(self, interface):
+    def run_interface(self):
 
-        print_error("synchronizer: connected to", interface.server)
+        print_error("synchronizer: connected to", self.network.main_server())
 
         requested_tx = []
         missing_tx = []
@@ -1436,7 +1591,7 @@ class WalletSynchronizer(threading.Thread):
             print_error("missing tx", missing_tx)
 
         # subscriptions
-        self.subscribe_to_addresses(self.wallet.addresses(True, next=True))
+        self.subscribe_to_addresses(self.wallet.addresses(True))
 
         while self.is_running():
             # 1. create new addresses
@@ -1449,12 +1604,12 @@ class WalletSynchronizer(threading.Thread):
             # request missing transactions
             for tx_hash, tx_height in missing_tx:
                 if (tx_hash, tx_height) not in requested_tx:
-                    interface.send([ ('blockchain.transaction.get',[tx_hash, tx_height]) ], lambda i,r: self.queue.put(r))
+                    self.network.send([ ('blockchain.transaction.get',[tx_hash, tx_height]) ], lambda i,r: self.queue.put(r))
                     requested_tx.append( (tx_hash, tx_height) )
             missing_tx = []
 
             # detect if situation has changed
-            if interface.is_up_to_date() and self.queue.empty():
+            if self.network.is_up_to_date() and self.queue.empty():
                 if not self.wallet.is_up_to_date():
                     self.wallet.set_up_to_date(True)
                     self.was_updated = True
@@ -1464,7 +1619,7 @@ class WalletSynchronizer(threading.Thread):
                     self.was_updated = True
 
             if self.was_updated:
-                self.wallet.network.trigger_callback('updated')
+                self.network.trigger_callback('updated')
                 self.was_updated = False
 
             # 2. get a response
@@ -1473,8 +1628,9 @@ class WalletSynchronizer(threading.Thread):
             except Queue.Empty:
                 continue
 
-            if interface != self.network.interface:
-                break
+            # see if it changed
+            #if interface != self.network.interface:
+            #    break
             
             if not r:
                 continue
@@ -1492,7 +1648,7 @@ class WalletSynchronizer(threading.Thread):
                 addr = params[0]
                 if self.wallet.get_status(self.wallet.get_history(addr)) != result:
                     if requested_histories.get(addr) is None:
-                        interface.send([('blockchain.address.get_history', [addr])], lambda i,r:self.queue.put(r))
+                        self.network.send([('blockchain.address.get_history', [addr])], lambda i,r:self.queue.put(r))
                         requested_histories[addr] = result
 
             elif method == 'blockchain.address.get_history':
@@ -1512,12 +1668,12 @@ class WalletSynchronizer(threading.Thread):
                             hist.append( (tx_hash, item['height']) )
 
                     if len(hist) != len(result):
-                        raise BaseException("error: server sent history with non-unique txid", result)
+                        raise Exception("error: server sent history with non-unique txid", result)
 
                     # check that the status corresponds to what was announced
                     rs = requested_histories.pop(addr)
                     if self.wallet.get_status(hist) != rs:
-                        raise BaseException("error: status mismatch: %s"%addr)
+                        raise Exception("error: status mismatch: %s"%addr)
                 
                     # store received history
                     self.wallet.receive_history_callback(addr, hist)
@@ -1542,7 +1698,180 @@ class WalletSynchronizer(threading.Thread):
                 print_error("Error: Unknown message:" + method + ", " + repr(params) + ", " + repr(result) )
 
             if self.was_updated and not requested_tx:
-                self.wallet.network.trigger_callback('updated')
-                self.wallet.network.trigger_callback("new_transaction") # Updated gets called too many times from other places as well; if we use that signal we get the notification three times
-
+                self.network.trigger_callback('updated')
+                # Updated gets called too many times from other places as well; if we use that signal we get the notification three times
+                self.network.trigger_callback("new_transaction") 
                 self.was_updated = False
+
+
+
+
+class OldWallet(NewWallet):
+
+    def init_seed(self, seed):
+        import mnemonic
+        
+        if self.seed: 
+            raise Exception("a seed exists")
+
+        if not seed:
+            seed = random_seed(128)
+
+        self.seed_version = OLD_SEED_VERSION
+
+        # see if seed was entered as hex
+        seed = seed.strip()
+        try:
+            assert seed
+            seed.decode('hex')
+            self.seed = str(seed)
+            return
+        except Exception:
+            pass
+
+        words = seed.split()
+        try:
+            mnemonic.mn_decode(words)
+        except Exception:
+            raise
+
+        self.seed = mnemonic.mn_decode(words)
+
+        if not self.seed:
+            raise Exception("Invalid seed")
+            
+
+
+    def get_master_public_key(self):
+        return self.storage.get("master_public_key")
+
+    def create_accounts(self, password):
+        seed = pw_decode(self.seed, password)
+        mpk = OldAccount.mpk_from_seed(seed)
+        self.create_account(mpk)
+
+    def create_account(self, mpk):
+        self.storage.put('master_public_key', mpk, True)
+        self.accounts[0] = OldAccount({'mpk':mpk, 0:[], 1:[]})
+        self.save_accounts()
+
+    def create_watching_only_wallet(self, K0):
+        self.seed_version = OLD_SEED_VERSION
+        self.storage.put('seed_version', self.seed_version, True)
+        self.create_account(K0)
+
+    def get_seed(self, password):
+        seed = pw_decode(self.seed, password)
+        self.accounts[0].check_seed(seed)
+        return seed
+
+    def get_mnemonic(self, password):
+        import mnemonic
+        s = pw_decode(self.seed, password)
+        return ' '.join(mnemonic.mn_encode(s))
+
+
+    def add_keypairs_from_KeyID(self, tx, keypairs, password):
+        # first check the provided password
+        seed = self.get_seed(password)
+        for txin in tx.inputs:
+            keyid = txin.get('KeyID')
+            if keyid:
+                m = re.match("old\(([0-9a-f]+),(\d+),(\d+)", keyid)
+                if not m: continue
+                mpk = m.group(1)
+                if mpk != self.storage.get('master_public_key'): continue 
+                for_change = int(m.group(2))
+                num = int(m.group(3))
+                account = self.accounts[0]
+                addr = account.get_address(for_change, num)
+                txin['address'] = addr # fixme: side effect
+                pk = account.get_private_key(seed, (for_change, num))
+                pubkey = public_key_from_private_key(pk)
+                keypairs[pubkey] = pk
+
+
+    def get_account_name(self, k):
+        assert k == 0
+        return 'Main account'
+
+
+
+
+# former WalletFactory
+class Wallet(object):
+
+    def __new__(self, storage):
+        config = storage.config
+        if config.get('bitkey', False):
+            # if user requested support for Bitkey device,
+            # import Bitkey driver
+            from wallet_bitkey import WalletBitkey
+            return WalletBitkey(config)
+
+        if not storage.file_exists:
+            seed_version = NEW_SEED_VERSION if config.get('bip32') is True else OLD_SEED_VERSION
+        else:
+            seed_version = storage.get('seed_version')
+
+        if seed_version == OLD_SEED_VERSION:
+            return OldWallet(storage)
+        elif seed_version == NEW_SEED_VERSION:
+            return NewWallet(storage)
+        else:
+            msg = "This wallet seed is not supported."
+            if seed_version in [5]:
+                msg += "\nTo open this wallet, try 'git checkout seed_v%d'"%seed_version
+            print msg
+            sys.exit(1)
+
+
+
+    @classmethod
+    def from_seed(self, seed, storage):
+        import mnemonic
+        if not seed:
+            return 
+
+        words = seed.strip().split()
+        try:
+            mnemonic.mn_decode(words)
+            uses_electrum_words = True
+        except Exception:
+            uses_electrum_words = False
+
+        try:
+            seed.decode('hex')
+            is_hex = True
+        except Exception:
+            is_hex = False
+         
+        if is_hex or (uses_electrum_words and len(words) != 13):
+            print "old style wallet", len(words), words
+            w = OldWallet(storage)
+            w.init_seed(seed) #hex
+        else:
+            #assert is_seed(seed)
+            w = NewWallet(storage)
+            w.init_seed(seed)
+
+        return w
+
+
+    @classmethod
+    def from_mpk(self, s, storage):
+        try:
+            mpk, chain = s.split(':')
+        except:
+            mpk = s
+            chain = False
+
+        if chain:
+            w = NewWallet(storage)
+            w.create_watching_only_wallet(mpk, chain)
+        else:
+            w = OldWallet(storage)
+            w.seed = ''
+            w.create_watching_only_wallet(mpk)
+
+        return w