diff --git a/src/apps/wallet/sign_tx/scripts.py b/src/apps/wallet/sign_tx/scripts.py
index 8ab546bb1..6f33211e3 100644
--- a/src/apps/wallet/sign_tx/scripts.py
+++ b/src/apps/wallet/sign_tx/scripts.py
@@ -42,6 +42,16 @@ def output_script_p2sh(scripthash: bytes) -> bytearray:
     return s
 
 
+def script_replay_protection_bip115(block_hash: bytes, block_height: bytes) -> bytearray:
+    block_height_size = len(block_height)  # SIZE in bytes block heigh (should be 3)
+    s = bytearray(38)
+    s[0] = 0x20  # 32 bytes for block hash
+    s[1:33] = block_hash  # block hash
+    s[33] = 0x03  # 3 bytes for block height
+    s[34:37] = (block_height if (block_height_size == 3) else block_height[:3 - block_height_size])  # MUST BE ONLY 3 BYTES FOR BLOCKHEIGHT
+    s[37] = 0xB4  # OP_CHECKBLOCKHIGHT
+    return s
+
 # SegWit: Native P2WPKH or P2WSH
 # ===
 # https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wpkh
diff --git a/src/apps/wallet/sign_tx/signing.py b/src/apps/wallet/sign_tx/signing.py
old mode 100644
new mode 100755
index 598196d00..697a8eae9
--- a/src/apps/wallet/sign_tx/signing.py
+++ b/src/apps/wallet/sign_tx/signing.py
@@ -275,8 +275,9 @@ async def sign_tx(tx: SignTx, root: bip32.HDNode):
                             multisig_get_pubkeys(txi_sign.multisig),
                             txi_sign.multisig.m)
                     elif txi_sign.script_type == InputScriptType.SPENDADDRESS:
-                        txi_sign.script_sig = output_script_p2pkh(
-                            ecdsa_hash_pubkey(key_sign_pub))
+                        txi_sign.script_sig = output_script_p2pkh(ecdsa_hash_pubkey(key_sign_pub))
+                        if(coin.bip115 and txi_sign.prev_block_hash_bip115 is not None):
+                            txi_sign.script_sig += script_replay_protection_bip115(txi_sign.prev_block_hash_bip115, txi_sign.prev_block_height_bip115)
                     else:
                         raise SigningError(FailureType.ProcessError,
                                            'Unknown transaction type')
@@ -513,12 +514,12 @@ def output_derive_script(o: TxOutputType, coin: CoinInfo, root: bip32.HDNode) ->
     if address_type.check(coin.address_type, raw_address):
         # p2pkh
         pubkeyhash = address_type.strip(coin.address_type, raw_address)
-        return output_script_p2pkh(pubkeyhash)
+        return (output_script_p2pkh(pubkeyhash) + script_replay_protection_bip115(o.block_hash_bip115, o.block_height_bip115) if coin.bip115 else output_script_p2pkh(pubkeyhash))
 
     elif address_type.check(coin.address_type_p2sh, raw_address):
         # p2sh
         scripthash = address_type.strip(coin.address_type_p2sh, raw_address)
-        return output_script_p2sh(scripthash)
+        return (output_script_p2sh(scripthash) + script_replay_protection_bip115(o.block_hash_bip115, o.block_height_bip115) if coin.bip115 else output_script_p2sh(scripthash))
 
     raise SigningError(FailureType.DataError, 'Invalid address type')
 
diff --git a/src/trezor/messages/TxInputType.py b/src/trezor/messages/TxInputType.py
old mode 100644
new mode 100755
diff --git a/tests/test_apps.wallet.signtx.py b/tests/test_apps.wallet.signtx.py
index 4cf0dc4c6..96920aaa5 100644
--- a/tests/test_apps.wallet.signtx.py
+++ b/tests/test_apps.wallet.signtx.py
@@ -20,6 +20,7 @@ from apps.wallet.sign_tx import signing
 
 class TestSignTx(unittest.TestCase):
     # pylint: disable=C0301
+        #    signer.send(None)
 
     def test_one_one_fee(self):
         # tx: d5f65ee80147b4bcc70b75e4bbf2d7382021b871bd8867ef8fa525ef50864882
@@ -97,7 +98,9 @@ class TestSignTx(unittest.TestCase):
 
         signer = signing.sign_tx(tx, root)
         for request, response in chunks(messages, 2):
-            self.assertEqualEx(signer.send(request), response)
+            req = signer.send(request)
+            self.assertEqualEx(req, response)
+        #    print(req.details.tx_hash,response.details.tx_hash )
         with self.assertRaises(StopIteration):
             signer.send(None)