diff --git a/gui/qt/transaction_dialog.py b/gui/qt/transaction_dialog.py
index ba91216a..4cdff319 100644
--- a/gui/qt/transaction_dialog.py
+++ b/gui/qt/transaction_dialog.py
@@ -242,7 +242,7 @@ class TxDialog(QDialog, MessageBoxMixin):
         i_text.setMaximumHeight(100)
         cursor = i_text.textCursor()
         for x in self.tx.inputs():
-            if x.get('is_coinbase'):
+            if x['type'] == 'coinbase':
                 cursor.insertText('coinbase')
             else:
                 prevout_hash = x.get('prevout_hash')
diff --git a/lib/transaction.py b/lib/transaction.py
index b80ded06..542e7c44 100644
--- a/lib/transaction.py
+++ b/lib/transaction.py
@@ -409,15 +409,14 @@ def parse_input(vds):
     prevout_hash = hash_encode(vds.read_bytes(32))
     prevout_n = vds.read_uint32()
     scriptSig = vds.read_bytes(vds.read_compact_size())
-    d['scriptSig'] = scriptSig.encode('hex')
     sequence = vds.read_uint32()
+    d['scriptSig'] = scriptSig.encode('hex')
+    d['prevout_hash'] = prevout_hash
+    d['prevout_n'] = prevout_n
+    d['sequence'] = sequence
     if prevout_hash == '00'*32:
-        d['is_coinbase'] = True
+        d['type'] = 'coinbase'
     else:
-        d['is_coinbase'] = False
-        d['prevout_hash'] = prevout_hash
-        d['prevout_n'] = prevout_n
-        d['sequence'] = sequence
         d['pubkeys'] = []
         d['signatures'] = {}
         d['address'] = None
@@ -637,6 +636,8 @@ class Transaction:
 
     @classmethod
     def input_script(self, txin, estimate_size=False):
+        if txin.get('scriptSig'):
+            return txin['scriptSig']
         _type = txin['type']
         pubkeys, sig_list = self.get_siglist(txin, estimate_size)
         script = ''.join(push_script(x) for x in sig_list)
@@ -796,7 +797,7 @@ class Transaction:
         r = 0
         s = 0
         for txin in self.inputs():
-            if txin.get('is_coinbase'):
+            if txin['type'] == 'coinbase':
                 continue
             signatures = filter(None, txin.get('signatures',[]))
             s += len(signatures)
diff --git a/lib/wallet.py b/lib/wallet.py
index 6b6bf098..3a452567 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -582,13 +582,13 @@ class Abstract_Wallet(PrintError):
                     return addr
 
     def add_transaction(self, tx_hash, tx):
-        is_coinbase = tx.inputs()[0].get('is_coinbase') == True
+        is_coinbase = tx.inputs()[0]['type'] == 'coinbase'
         with self.transaction_lock:
             # add inputs
             self.txi[tx_hash] = d = {}
             for txi in tx.inputs():
                 addr = txi.get('address')
-                if not txi.get('is_coinbase'):
+                if txi['type'] != 'coinbase':
                     prevout_hash = txi['prevout_hash']
                     prevout_n = txi['prevout_n']
                     ser = prevout_hash + ':%d'%prevout_n
diff --git a/plugins/digitalbitbox/digitalbitbox.py b/plugins/digitalbitbox/digitalbitbox.py
index cf6ae0de..2589227d 100644
--- a/plugins/digitalbitbox/digitalbitbox.py
+++ b/plugins/digitalbitbox/digitalbitbox.py
@@ -366,7 +366,7 @@ class DigitalBitbox_KeyStore(Hardware_KeyStore):
             
             # Build hasharray from inputs
             for i, txin in enumerate(tx.inputs()):
-                if txin.get('is_coinbase'):
+                if txin['type'] == 'coinbase':
                     self.give_error("Coinbase not supported") # should never happen
                 
                 if txin['type'] in ['p2sh']:
diff --git a/plugins/ledger/ledger.py b/plugins/ledger/ledger.py
index 5e87d2b1..fa382678 100644
--- a/plugins/ledger/ledger.py
+++ b/plugins/ledger/ledger.py
@@ -275,7 +275,7 @@ class Ledger_KeyStore(Hardware_KeyStore):
         # Fetch inputs of the transaction to sign
         derivations = self.get_tx_derivations(tx)
         for txin in tx.inputs():
-            if txin.get('is_coinbase'):
+            if txin['type'] == 'coinbase':
                 self.give_error("Coinbase not supported")     # should never happen
 
             if txin['type'] in ['p2sh']:
diff --git a/plugins/trezor/plugin.py b/plugins/trezor/plugin.py
index 637f1538..266522d0 100644
--- a/plugins/trezor/plugin.py
+++ b/plugins/trezor/plugin.py
@@ -259,7 +259,7 @@ class TrezorCompatiblePlugin(HW_PluginBase):
         inputs = []
         for txin in tx.inputs():
             txinputtype = self.types.TxInputType()
-            if txin.get('is_coinbase'):
+            if txin['type'] == 'coinbase':
                 prev_hash = "\0"*32
                 prev_index = 0xffffffff  # signed int -1
             else: