trezor · andrewkozlik · Oct 18, 2021 · Oct 18, 2021
diff --git a/common/protob/messages-bitcoin.proto b/common/protob/messages-bitcoin.proto
@@ -300,6 +300,7 @@ message TxAck {
             optional bytes orig_hash = 16;                                      // tx_hash of the original transaction where this input was spent (used when creating a replacement transaction)
             optional uint32 orig_index = 17;                                    // index of the input in the original transaction (used when creating a replacement transaction)
             optional DecredStakingSpendType decred_staking_spend = 18;          // if not None this holds the type of stake spend: revocation or stake generation
+            optional bytes script_pubkey = 19;                                  // scriptPubKey of the previous output spent by this input, only set of EXTERNAL inputs
         }
         /**
         * Structure representing compiled transaction output
@@ -351,6 +352,7 @@ message TxInput {
     optional bytes orig_hash = 16;                                      // tx_hash of the original transaction where this input was spent (used when creating a replacement transaction)
     optional uint32 orig_index = 17;                                    // index of the input in the original transaction (used when creating a replacement transaction)
     optional DecredStakingSpendType decred_staking_spend = 18; 	        // if not None this holds the type of stake spend: revocation or stake generation
+    optional bytes script_pubkey = 19;                                  // scriptPubKey of the previous output spent by this input, only set of EXTERNAL inputs
 }
 
 /** Data type for transaction output to be signed.
@@ -399,7 +401,7 @@ message PrevInput {
     optional uint32 decred_tree = 9;                                    // only for Decred
 
     // fields that are in use, or have been in the past, in TxInputType
-    reserved 1, 6, 7, 8, 10, 11, 12, 13, 14, 15;
+    reserved 1, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19;
 }
 
 /** Data type for outputs of previous transactions.

diff --git a/core/.changelog.d/1857.added b/core/.changelog.d/1857.added
@@ -0,0 +1 @@
+Add script_pubkey field to TxInput message.
diff --git a/core/src/trezor/messages.py b/core/src/trezor/messages.py
@@ -643,6 +643,7 @@ class TxInput(protobuf.MessageType):
         orig_hash: "bytes | None"
         orig_index: "int | None"
         decred_staking_spend: "DecredStakingSpendType | None"
+        script_pubkey: "bytes | None"
 
         def __init__(
             self,
@@ -662,6 +663,7 @@ def __init__(
             orig_hash: "bytes | None" = None,
             orig_index: "int | None" = None,
             decred_staking_spend: "DecredStakingSpendType | None" = None,
+            script_pubkey: "bytes | None" = None,
         ) -> None:
             pass
 

diff --git a/docs/common/communication/bitcoin-signing.md b/docs/common/communication/bitcoin-signing.md
@@ -154,7 +154,7 @@ signing party hasn't signed their input yet (i.e., with two Trezors, one must si
 so that the other can include a pre-signed input), they can instead provide a
 [SLIP-19](https://github.com/satoshilabs/slips/blob/master/slip-0019.md)
 ownership proof in the `ownership_proof` field, with optional commitment data in
-`commitment_data`.
+`commitment_data`. The `script_pubkey` field is required for all external inputs.
 
 ### Transaction output
 

diff --git a/legacy/firmware/.changelog.d/1857.added b/legacy/firmware/.changelog.d/1857.added
@@ -0,0 +1 @@
+Add script_pubkey field to TxInput message.
diff --git a/legacy/firmware/messages.h b/legacy/firmware/messages.h
@@ -32,7 +32,7 @@
 #define MSG_IN_ENCODED_SIZE (16 * 1024)
 
 // Maximum size of a C struct containing a decoded incoming message.
-#define MSG_IN_DECODED_SIZE (15 * 1024)
+#define MSG_IN_DECODED_SIZE (16 * 1024)
 
 // Buffer size for outgoing USB packets with headers.
 #define MSG_OUT_BUFFER_SIZE (3 * 1024)

diff --git a/legacy/firmware/protob/messages-bitcoin.options b/legacy/firmware/protob/messages-bitcoin.options
@@ -35,6 +35,7 @@ TxInputType.witness                                         max_size:109
 TxInputType.ownership_proof                                 max_size:171
 TxInputType.commitment_data                                 max_size:32
 TxInputType.orig_hash                                       max_size:32
+TxInputType.script_pubkey                                   max_size:520
 
 TxOutputType.address                                        max_size:130
 TxOutputType.address_n                                      max_count:8
@@ -62,6 +63,7 @@ TxInput.witness                                             max_size:109
 TxInput.ownership_proof                                     max_size:171
 TxInput.commitment_data                                     max_size:32
 TxInput.orig_hash                                           max_size:32
+TxInput.script_pubkey                                       max_size:520
 
 TxOutput.address                                            max_size:130
 TxOutput.address_n                                          max_count:8

diff --git a/python/.changelog.d/1857.added b/python/.changelog.d/1857.added
@@ -0,0 +1 @@
+Add script_pubkey field to TxInput message.
diff --git a/python/src/trezorlib/messages.py b/python/src/trezorlib/messages.py
@@ -1197,6 +1197,7 @@ class TxInput(protobuf.MessageType):
         16: protobuf.Field("orig_hash", "bytes", repeated=False, required=False),
         17: protobuf.Field("orig_index", "uint32", repeated=False, required=False),
         18: protobuf.Field("decred_staking_spend", "DecredStakingSpendType", repeated=False, required=False),
+        19: protobuf.Field("script_pubkey", "bytes", repeated=False, required=False),
     }
 
     def __init__(
@@ -1217,6 +1218,7 @@ def __init__(
         orig_hash: Optional["bytes"] = None,
         orig_index: Optional["int"] = None,
         decred_staking_spend: Optional["DecredStakingSpendType"] = None,
+        script_pubkey: Optional["bytes"] = None,
     ) -> None:
         self.address_n = address_n if address_n is not None else []
         self.prev_hash = prev_hash
@@ -1233,6 +1235,7 @@ def __init__(
         self.orig_hash = orig_hash
         self.orig_index = orig_index
         self.decred_staking_spend = decred_staking_spend
+        self.script_pubkey = script_pubkey
 
 
 class TxOutput(protobuf.MessageType):
@@ -1650,6 +1653,7 @@ class TxInputType(protobuf.MessageType):
         16: protobuf.Field("orig_hash", "bytes", repeated=False, required=False),
         17: protobuf.Field("orig_index", "uint32", repeated=False, required=False),
         18: protobuf.Field("decred_staking_spend", "DecredStakingSpendType", repeated=False, required=False),
+        19: protobuf.Field("script_pubkey", "bytes", repeated=False, required=False),
     }
 
     def __init__(
@@ -1670,6 +1674,7 @@ def __init__(
         orig_hash: Optional["bytes"] = None,
         orig_index: Optional["int"] = None,
         decred_staking_spend: Optional["DecredStakingSpendType"] = None,
+        script_pubkey: Optional["bytes"] = None,
     ) -> None:
         self.address_n = address_n if address_n is not None else []
         self.prev_hash = prev_hash
@@ -1686,6 +1691,7 @@ def __init__(
         self.orig_hash = orig_hash
         self.orig_index = orig_index
         self.decred_staking_spend = decred_staking_spend
+        self.script_pubkey = script_pubkey
 
 
 class TxOutputBinType(protobuf.MessageType):