diff --git a/lib/commands.py b/lib/commands.py
index 23c35b896..9106b1ca4 100644
--- a/lib/commands.py
+++ b/lib/commands.py
@@ -159,19 +159,13 @@ class Commands:
         return True
 
     @command('')
-    def make_seed(self, nbits=132, entropy=1, language=None, segwit=False):
+    def make_seed(self, nbits=132, language=None, segwit=False):
         """Create a seed"""
         from .mnemonic import Mnemonic
         t = 'segwit' if segwit else 'standard'
-        s = Mnemonic(language).make_seed(t, nbits, custom_entropy=entropy)
+        s = Mnemonic(language).make_seed(t, nbits)
         return s
 
-    @command('')
-    def check_seed(self, seed, entropy=1, language=None):
-        """Check that a seed was generated with given entropy"""
-        from .mnemonic import Mnemonic
-        return Mnemonic(language).check_seed(seed, entropy)
-
     @command('n')
     def getaddresshistory(self, address):
         """Return the transaction history of any address. Note: This is a
@@ -697,7 +691,6 @@ command_options = {
     'from_addr':   ("-F", "Source address (must be a wallet address; use sweep to spend from non-wallet address)."),
     'change_addr': ("-c", "Change address. Default is a spare address, or the source address if it's not in the wallet"),
     'nbits':       (None, "Number of bits of entropy"),
-    'entropy':     (None, "Custom entropy"),
     'segwit':      (None, "Create segwit seed"),
     'language':    ("-L", "Default language for wordlist"),
     'privkey':     (None, "Private key. Set to '?' to get a prompt."),
@@ -726,7 +719,6 @@ arg_types = {
     'nbits': int,
     'imax': int,
     'year': int,
-    'entropy': int,
     'tx': tx_from_str,
     'pubkeys': json_loads,
     'jsontx': json_loads,
diff --git a/lib/mnemonic.py b/lib/mnemonic.py
index 7096e20f6..846dcc74f 100644
--- a/lib/mnemonic.py
+++ b/lib/mnemonic.py
@@ -157,28 +157,21 @@ class Mnemonic(object):
             i = i*n + k
         return i
 
-    def check_seed(self, seed, custom_entropy):
-        assert is_new_seed(seed)
-        i = self.mnemonic_decode(seed)
-        return i % custom_entropy == 0
-
-    def make_seed(self, seed_type='standard', num_bits=132, custom_entropy=1):
+    def make_seed(self, seed_type='standard', num_bits=132):
         prefix = version.seed_prefix(seed_type)
         # increase num_bits in order to obtain a uniform distibution for the last word
         bpw = math.log(len(self.wordlist), 2)
-        num_bits = int(math.ceil(num_bits/bpw) * bpw)
-        # handle custom entropy; make sure we add at least 16 bits
-        n_custom = int(math.ceil(math.log(custom_entropy, 2)))
-        n = max(16, num_bits - n_custom)
-        print_error("make_seed", prefix, "adding %d bits"%n)
-        my_entropy = 1
-        while my_entropy < pow(2, n - bpw):
+        # rounding
+        n = int(math.ceil(num_bits/bpw) * bpw)
+        print_error("make_seed. prefix: '%s'"%prefix, "entropy: %d bits"%n)
+        entropy = 1
+        while entropy < pow(2, n - bpw):
             # try again if seed would not contain enough words
-            my_entropy = ecdsa.util.randrange(pow(2, n))
+            entropy = ecdsa.util.randrange(pow(2, n))
         nonce = 0
         while True:
             nonce += 1
-            i = custom_entropy * (my_entropy + nonce)
+            i = entropy + nonce
             seed = self.mnemonic_encode(i)
             assert i == self.mnemonic_decode(seed)
             if is_old_seed(seed):